TASC Housing and Design cheat sheet

Life-cycle stages commonly used in housing analysis: launching (single young adult), newly married or coupled, childbearing, child-rearing with preschoolers, child-rearing with school-age children, families with teens, launching of children, empty nest, retirement, and widowhood or late-life solo living.

Housing needs shift with stage: space and bedroom counts peak during child-rearing, budget pressure peaks with young children and again with college-age children, and accessibility needs rise in later stages.

Shelter is a basic need; Maslow-style ordering places shelter with physiological and safety needs, while status, privacy, and self-expression are higher-order housing motives.

Housing demand drivers: household formation, income, household size, age structure, and migration; household size and dwelling size are inversely related across stages (larger households often occupy relatively smaller per-person space).

Affordability benchmark: housing cost burden is commonly defined as gross housing cost exceeding 30 percent of gross household income; severe burden is 50 percent or more.

Crowding rule of thumb: more than one person per habitable room (excluding bathrooms and kitchens) is generally treated as crowded; more than 1.5 persons per room is severe crowding.

Universal design and visitability respond to aging and disability: no-step entry, wide doorways (about 32-36 inches clear), lever handles, and at least one full bath and bedroom on the entry level.

Housing tenure choice (own vs. rent) depends on expected length of stay, mobility needs, tax treatment, transaction costs, and down-payment capacity; short expected tenure favors renting.

Decision sequence for housing choice: identify needs and constraints, set a budget, define location and space criteria, screen alternatives, compare costs of ownership or rental, inspect, negotiate, and close or sign.

Total monthly housing cost for owners includes principal, interest, property taxes, insurance, utilities, maintenance, and association fees; renters add renter's insurance and utilities not included in rent.

Front-end ratio compares housing cost to income; back-end ratio compares total debt payments to income; lenders commonly use a back-end ceiling near 36-43 percent.

Location trade-offs are evaluated by commute cost and time, school quality, safety, services, and resale or rental demand; transportation cost can offset a lower purchase price.

Sunk and transaction costs matter: closing costs, moving costs, and realtor commissions reduce the break-even period for buying versus renting.

Consumer protection steps: obtain multiple quotes, verify licenses, read contracts fully, keep written records, and know cooling-off or cancellation rights where they apply.

Renters should document unit condition at move-in with dated photos and a signed checklist to protect the security deposit.

Fair housing law prohibits discrimination in sale or rental based on protected classes such as race, color, religion, sex, disability, familial status, and national origin.

Elements of design: line, form, space, mass, texture, color, and light; principles of design: balance, rhythm, emphasis, proportion and scale, harmony, and unity.

Balance types: symmetrical (mirror image), asymmetrical (equal visual weight from unlike objects), and radial (elements radiate from a center).

Rhythm is created by repetition, gradation, transition, radiation, and opposition; emphasis creates a focal point; harmony is agreement among parts, and unity is the total effect.

Color dimensions: hue (name), value (lightness or darkness), and intensity or chroma (saturation); tints add white, shades add black, and tones add gray.

Color schemes: monochromatic (one hue), analogous (adjacent hues), complementary (opposite hues), split-complementary, and triadic (three evenly spaced hues).

Color temperature: warm hues (red, orange, yellow) advance and can make a large room feel cozy; cool hues (blue, green, violet) recede and can make a small room feel larger.

Lighting layers: ambient (general), task (focused work), accent (highlighting), and decorative; light color rendering is measured by CRI and efficiency by lumens per watt.

Scale relates object size to room and human size; proportion relates parts to each other; the golden section ratio is approximately 1:1.618.

Circulation rules: main paths about 36-48 inches wide, secondary paths about 24-36 inches, and single-person passage at least 24 inches.

Kitchen work triangle connects sink, refrigerator, and range; the sum of the three legs should be roughly 13-26 feet, with no leg under about 4 feet or over about 9 feet.

Kitchen clearances: at least 36 inches between opposing counters in a work aisle, 42 inches when two cooks share the space, and 15 inches of landing space beside a sink or range.

Dining clearances: allow about 24 inches of table edge per seated diner and 36 inches from table edge to wall or obstacle for chair pull-out and passage.

Bedroom planning: allow about 24-30 inches beside a bed for making it and passage, and 36 inches at the foot of the bed for a main path.

Bathroom clearances: about 30 inches in front of a lavatory and toilet, 24 inches in front of a tub or shower, and 15 inches from toilet centerline to a side wall.

Adjacency zoning separates public (entry, living, dining), private (bedrooms, baths), and service (kitchen, laundry, utility) zones; plumbing is grouped on shared walls to cut cost.

Open-plan trade-offs: open plans improve sightlines and light but reduce acoustic privacy and require furniture arrangement to define functional zones.

Flooring comparison: hardwood is warm and refinishable but moisture-sensitive; ceramic tile resists water but is hard and cold; vinyl and laminate are economical but less refinishable; carpet adds acoustic and thermal comfort but traps soil and allergens.

Resilient flooring classes: sheet vinyl, luxury vinyl tile or plank, linoleum (linseed oil based), cork, and rubber; rubber is common in commercial and gym settings for slip and shock resistance.

Countertop materials: granite and quartz resist heat and stains (quartz is engineered and nonporous), solid surface is repairable and seamless, laminate is economical but heat-sensitive, and butcher block requires oiling.

Wood cabinet construction terms: face frame vs. frameless, overlay vs. inset doors, plywood vs. particleboard boxes, and dovetail or doweled drawer joints.

Upholstery durability is rated by double rubs (Wyzenbeek or Martindale); higher counts suit heavy residential or commercial use.

Fabric fibers: natural (cotton, linen, wool, silk) vs. synthetic (polyester, nylon, olefin); olefin and solution-dyed nylon resist moisture and fading well.

Paint finishes by sheen: flat hides imperfections but cleans poorly, eggshell and satin suit most walls, semi-gloss suits trim and kitchens, and gloss is most washable and reflective.

Material selection criteria: durability, maintenance, moisture and heat resistance, slip resistance (coefficient of friction), indoor air quality (low-VOC emissions), and life-cycle cost.

Smoke alarms should be on every level, inside and outside sleeping areas, and in bedrooms where required; carbon monoxide alarms belong near sleeping areas and on each level.

Radon is a colorless, odorless soil gas; test kits are inexpensive, and mitigation (sub-slab depressurization) is the standard fix when levels reach about 4 pCi/L or higher.

Lead paint hazard applies mainly to pre-1978 housing; disclose known lead hazards, use certified renovators for disturbing paint, and control dust.

Electrical safety: GFCI protection in kitchens, baths, garages, outdoors, and near water; AFCI protection for bedroom and living-area circuits; never overload circuits or use damaged cords.

Water heater safety: set tank thermostats near 120 degrees F to reduce scalding, and maintain the temperature-vs-Legionella trade-off; strap heaters in seismic zones and test the T&P valve.

Preventive maintenance schedule: HVAC filters monthly to quarterly, gutters twice a year, smoke alarm tests monthly, dryer vent cleaning annually, and roof and caulk inspection seasonally.

Sustainability concepts: energy efficiency (insulation, air sealing, efficient appliances), water conservation (low-flow fixtures, drought-tolerant landscaping), and durable, low-toxicity materials.

Indoor air quality controls: source control, ventilation (including mechanical and kitchen/bath exhaust), filtration (MERV rating), and moisture control to prevent mold growth.

Life-cycle stages commonly used in housing analysis: launching (single young adult), newly married or coupled, childbearing, child-rearing with preschoolers, child-rearing with school-age children, families with teens, launching of children, empty nest, retirement, and widowhood or late-life solo living.

Housing needs shift with stage: space and bedroom counts peak during child-rearing, budget pressure peaks with young children and again with college-age children, and accessibility needs rise in later stages.

Shelter is a basic need; Maslow-style ordering places shelter with physiological and safety needs, while status, privacy, and self-expression are higher-order housing motives.

Housing demand drivers: household formation, income, household size, age structure, and migration; household size and dwelling size are inversely related across stages (larger households often occupy relatively smaller per-person space).

Affordability benchmark: housing cost burden is commonly defined as gross housing cost exceeding 30 percent of gross household income; severe burden is 50 percent or more.

Crowding rule of thumb: more than one person per habitable room (excluding bathrooms and kitchens) is generally treated as crowded; more than 1.5 persons per room is severe crowding.

Universal design and visitability respond to aging and disability: no-step entry, wide doorways (about 32-36 inches clear), lever handles, and at least one full bath and bedroom on the entry level.

Housing tenure choice (own vs. rent) depends on expected length of stay, mobility needs, tax treatment, transaction costs, and down-payment capacity; short expected tenure favors renting.

Decision sequence for housing choice: identify needs and constraints, set a budget, define location and space criteria, screen alternatives, compare costs of ownership or rental, inspect, negotiate, and close or sign.

Total monthly housing cost for owners includes principal, interest, property taxes, insurance, utilities, maintenance, and association fees; renters add renter's insurance and utilities not included in rent.

Front-end ratio compares housing cost to income; back-end ratio compares total debt payments to income; lenders commonly use a back-end ceiling near 36-43 percent.

Location trade-offs are evaluated by commute cost and time, school quality, safety, services, and resale or rental demand; transportation cost can offset a lower purchase price.

Sunk and transaction costs matter: closing costs, moving costs, and realtor commissions reduce the break-even period for buying versus renting.

Consumer protection steps: obtain multiple quotes, verify licenses, read contracts fully, keep written records, and know cooling-off or cancellation rights where they apply.

Renters should document unit condition at move-in with dated photos and a signed checklist to protect the security deposit.

Fair housing law prohibits discrimination in sale or rental based on protected classes such as race, color, religion, sex, disability, familial status, and national origin.

Elements of design: line, form, space, mass, texture, color, and light; principles of design: balance, rhythm, emphasis, proportion and scale, harmony, and unity.

Balance types: symmetrical (mirror image), asymmetrical (equal visual weight from unlike objects), and radial (elements radiate from a center).

Rhythm is created by repetition, gradation, transition, radiation, and opposition; emphasis creates a focal point; harmony is agreement among parts, and unity is the total effect.

Color dimensions: hue (name), value (lightness or darkness), and intensity or chroma (saturation); tints add white, shades add black, and tones add gray.

Color schemes: monochromatic (one hue), analogous (adjacent hues), complementary (opposite hues), split-complementary, and triadic (three evenly spaced hues).

Color temperature: warm hues (red, orange, yellow) advance and can make a large room feel cozy; cool hues (blue, green, violet) recede and can make a small room feel larger.

Lighting layers: ambient (general), task (focused work), accent (highlighting), and decorative; light color rendering is measured by CRI and efficiency by lumens per watt.

Scale relates object size to room and human size; proportion relates parts to each other; the golden section ratio is approximately 1:1.618.

Circulation rules: main paths about 36-48 inches wide, secondary paths about 24-36 inches, and single-person passage at least 24 inches.

Kitchen work triangle connects sink, refrigerator, and range; the sum of the three legs should be roughly 13-26 feet, with no leg under about 4 feet or over about 9 feet.

Kitchen clearances: at least 36 inches between opposing counters in a work aisle, 42 inches when two cooks share the space, and 15 inches of landing space beside a sink or range.

Dining clearances: allow about 24 inches of table edge per seated diner and 36 inches from table edge to wall or obstacle for chair pull-out and passage.

Bedroom planning: allow about 24-30 inches beside a bed for making it and passage, and 36 inches at the foot of the bed for a main path.

Bathroom clearances: about 30 inches in front of a lavatory and toilet, 24 inches in front of a tub or shower, and 15 inches from toilet centerline to a side wall.

Adjacency zoning separates public (entry, living, dining), private (bedrooms, baths), and service (kitchen, laundry, utility) zones; plumbing is grouped on shared walls to cut cost.

Open-plan trade-offs: open plans improve sightlines and light but reduce acoustic privacy and require furniture arrangement to define functional zones.

Flooring comparison: hardwood is warm and refinishable but moisture-sensitive; ceramic tile resists water but is hard and cold; vinyl and laminate are economical but less refinishable; carpet adds acoustic and thermal comfort but traps soil and allergens.

Resilient flooring classes: sheet vinyl, luxury vinyl tile or plank, linoleum (linseed oil based), cork, and rubber; rubber is common in commercial and gym settings for slip and shock resistance.

Countertop materials: granite and quartz resist heat and stains (quartz is engineered and nonporous), solid surface is repairable and seamless, laminate is economical but heat-sensitive, and butcher block requires oiling.

Wood cabinet construction terms: face frame vs. frameless, overlay vs. inset doors, plywood vs. particleboard boxes, and dovetail or doweled drawer joints.

Upholstery durability is rated by double rubs (Wyzenbeek or Martindale); higher counts suit heavy residential or commercial use.

Fabric fibers: natural (cotton, linen, wool, silk) vs. synthetic (polyester, nylon, olefin); olefin and solution-dyed nylon resist moisture and fading well.

Paint finishes by sheen: flat hides imperfections but cleans poorly, eggshell and satin suit most walls, semi-gloss suits trim and kitchens, and gloss is most washable and reflective.

Material selection criteria: durability, maintenance, moisture and heat resistance, slip resistance (coefficient of friction), indoor air quality (low-VOC emissions), and life-cycle cost.

Smoke alarms should be on every level, inside and outside sleeping areas, and in bedrooms where required; carbon monoxide alarms belong near sleeping areas and on each level.

Radon is a colorless, odorless soil gas; test kits are inexpensive, and mitigation (sub-slab depressurization) is the standard fix when levels reach about 4 pCi/L or higher.

Lead paint hazard applies mainly to pre-1978 housing; disclose known lead hazards, use certified renovators for disturbing paint, and control dust.

Electrical safety: GFCI protection in kitchens, baths, garages, outdoors, and near water; AFCI protection for bedroom and living-area circuits; never overload circuits or use damaged cords.

Water heater safety: set tank thermostats near 120 degrees F to reduce scalding, and maintain the temperature-vs-Legionella trade-off; strap heaters in seismic zones and test the T&P valve.

Preventive maintenance schedule: HVAC filters monthly to quarterly, gutters twice a year, smoke alarm tests monthly, dryer vent cleaning annually, and roof and caulk inspection seasonally.

Sustainability concepts: energy efficiency (insulation, air sealing, efficient appliances), water conservation (low-flow fixtures, drought-tolerant landscaping), and durable, low-toxicity materials.

Indoor air quality controls: source control, ventilation (including mechanical and kitchen/bath exhaust), filtration (MERV rating), and moisture control to prevent mold growth.

Life-cycle stages commonly used in housing analysis: launching (single young adult), newly married or coupled, childbearing, child-rearing with preschoolers, child-rearing with school-age children, families with teens, launching of children, empty nest, retirement, and widowhood or late-life solo living.

Housing needs shift with stage: space and bedroom counts peak during child-rearing, budget pressure peaks with young children and again with college-age children, and accessibility needs rise in later stages.

Shelter is a basic need; Maslow-style ordering places shelter with physiological and safety needs, while status, privacy, and self-expression are higher-order housing motives.

Housing demand drivers: household formation, income, household size, age structure, and migration; household size and dwelling size are inversely related across stages (larger households often occupy relatively smaller per-person space).

Affordability benchmark: housing cost burden is commonly defined as gross housing cost exceeding 30 percent of gross household income; severe burden is 50 percent or more.

Crowding rule of thumb: more than one person per habitable room (excluding bathrooms and kitchens) is generally treated as crowded; more than 1.5 persons per room is severe crowding.

Universal design and visitability respond to aging and disability: no-step entry, wide doorways (about 32-36 inches clear), lever handles, and at least one full bath and bedroom on the entry level.

Housing tenure choice (own vs. rent) depends on expected length of stay, mobility needs, tax treatment, transaction costs, and down-payment capacity; short expected tenure favors renting.

Decision sequence for housing choice: identify needs and constraints, set a budget, define location and space criteria, screen alternatives, compare costs of ownership or rental, inspect, negotiate, and close or sign.

Total monthly housing cost for owners includes principal, interest, property taxes, insurance, utilities, maintenance, and association fees; renters add renter's insurance and utilities not included in rent.

Front-end ratio compares housing cost to income; back-end ratio compares total debt payments to income; lenders commonly use a back-end ceiling near 36-43 percent.

Location trade-offs are evaluated by commute cost and time, school quality, safety, services, and resale or rental demand; transportation cost can offset a lower purchase price.

Sunk and transaction costs matter: closing costs, moving costs, and realtor commissions reduce the break-even period for buying versus renting.

Consumer protection steps: obtain multiple quotes, verify licenses, read contracts fully, keep written records, and know cooling-off or cancellation rights where they apply.

Renters should document unit condition at move-in with dated photos and a signed checklist to protect the security deposit.

Fair housing law prohibits discrimination in sale or rental based on protected classes such as race, color, religion, sex, disability, familial status, and national origin.

Elements of design: line, form, space, mass, texture, color, and light; principles of design: balance, rhythm, emphasis, proportion and scale, harmony, and unity.

Balance types: symmetrical (mirror image), asymmetrical (equal visual weight from unlike objects), and radial (elements radiate from a center).

Rhythm is created by repetition, gradation, transition, radiation, and opposition; emphasis creates a focal point; harmony is agreement among parts, and unity is the total effect.

Color dimensions: hue (name), value (lightness or darkness), and intensity or chroma (saturation); tints add white, shades add black, and tones add gray.

Color schemes: monochromatic (one hue), analogous (adjacent hues), complementary (opposite hues), split-complementary, and triadic (three evenly spaced hues).

Color temperature: warm hues (red, orange, yellow) advance and can make a large room feel cozy; cool hues (blue, green, violet) recede and can make a small room feel larger.

Lighting layers: ambient (general), task (focused work), accent (highlighting), and decorative; light color rendering is measured by CRI and efficiency by lumens per watt.

Scale relates object size to room and human size; proportion relates parts to each other; the golden section ratio is approximately 1:1.618.

Circulation rules: main paths about 36-48 inches wide, secondary paths about 24-36 inches, and single-person passage at least 24 inches.

Kitchen work triangle connects sink, refrigerator, and range; the sum of the three legs should be roughly 13-26 feet, with no leg under about 4 feet or over about 9 feet.

Kitchen clearances: at least 36 inches between opposing counters in a work aisle, 42 inches when two cooks share the space, and 15 inches of landing space beside a sink or range.

Dining clearances: allow about 24 inches of table edge per seated diner and 36 inches from table edge to wall or obstacle for chair pull-out and passage.

Bedroom planning: allow about 24-30 inches beside a bed for making it and passage, and 36 inches at the foot of the bed for a main path.

Bathroom clearances: about 30 inches in front of a lavatory and toilet, 24 inches in front of a tub or shower, and 15 inches from toilet centerline to a side wall.

Adjacency zoning separates public (entry, living, dining), private (bedrooms, baths), and service (kitchen, laundry, utility) zones; plumbing is grouped on shared walls to cut cost.

Open-plan trade-offs: open plans improve sightlines and light but reduce acoustic privacy and require furniture arrangement to define functional zones.

Flooring comparison: hardwood is warm and refinishable but moisture-sensitive; ceramic tile resists water but is hard and cold; vinyl and laminate are economical but less refinishable; carpet adds acoustic and thermal comfort but traps soil and allergens.

Resilient flooring classes: sheet vinyl, luxury vinyl tile or plank, linoleum (linseed oil based), cork, and rubber; rubber is common in commercial and gym settings for slip and shock resistance.

Countertop materials: granite and quartz resist heat and stains (quartz is engineered and nonporous), solid surface is repairable and seamless, laminate is economical but heat-sensitive, and butcher block requires oiling.

Wood cabinet construction terms: face frame vs. frameless, overlay vs. inset doors, plywood vs. particleboard boxes, and dovetail or doweled drawer joints.

Upholstery durability is rated by double rubs (Wyzenbeek or Martindale); higher counts suit heavy residential or commercial use.

Fabric fibers: natural (cotton, linen, wool, silk) vs. synthetic (polyester, nylon, olefin); olefin and solution-dyed nylon resist moisture and fading well.

Paint finishes by sheen: flat hides imperfections but cleans poorly, eggshell and satin suit most walls, semi-gloss suits trim and kitchens, and gloss is most washable and reflective.

Material selection criteria: durability, maintenance, moisture and heat resistance, slip resistance (coefficient of friction), indoor air quality (low-VOC emissions), and life-cycle cost.

Smoke alarms should be on every level, inside and outside sleeping areas, and in bedrooms where required; carbon monoxide alarms belong near sleeping areas and on each level.

Radon is a colorless, odorless soil gas; test kits are inexpensive, and mitigation (sub-slab depressurization) is the standard fix when levels reach about 4 pCi/L or higher.

Lead paint hazard applies mainly to pre-1978 housing; disclose known lead hazards, use certified renovators for disturbing paint, and control dust.

Electrical safety: GFCI protection in kitchens, baths, garages, outdoors, and near water; AFCI protection for bedroom and living-area circuits; never overload circuits or use damaged cords.

Water heater safety: set tank thermostats near 120 degrees F to reduce scalding, and maintain the temperature-vs-Legionella trade-off; strap heaters in seismic zones and test the T&P valve.

Preventive maintenance schedule: HVAC filters monthly to quarterly, gutters twice a year, smoke alarm tests monthly, dryer vent cleaning annually, and roof and caulk inspection seasonally.

Sustainability concepts: energy efficiency (insulation, air sealing, efficient appliances), water conservation (low-flow fixtures, drought-tolerant landscaping), and durable, low-toxicity materials.

Indoor air quality controls: source control, ventilation (including mechanical and kitchen/bath exhaust), filtration (MERV rating), and moisture control to prevent mold growth.

Life-cycle stages commonly used in housing analysis: launching (single young adult), newly married or coupled, childbearing, child-rearing with preschoolers, child-rearing with school-age children, families with teens, launching of children, empty nest, retirement, and widowhood or late-life solo living.

Housing needs shift with stage: space and bedroom counts peak during child-rearing, budget pressure peaks with young children and again with college-age children, and accessibility needs rise in later stages.

Shelter is a basic need; Maslow-style ordering places shelter with physiological and safety needs, while status, privacy, and self-expression are higher-order housing motives.

Housing demand drivers: household formation, income, household size, age structure, and migration; household size and dwelling size are inversely related across stages (larger households often occupy relatively smaller per-person space).

Affordability benchmark: housing cost burden is commonly defined as gross housing cost exceeding 30 percent of gross household income; severe burden is 50 percent or more.

Crowding rule of thumb: more than one person per habitable room (excluding bathrooms and kitchens) is generally treated as crowded; more than 1.5 persons per room is severe crowding.

Universal design and visitability respond to aging and disability: no-step entry, wide doorways (about 32-36 inches clear), lever handles, and at least one full bath and bedroom on the entry level.

Housing tenure choice (own vs. rent) depends on expected length of stay, mobility needs, tax treatment, transaction costs, and down-payment capacity; short expected tenure favors renting.

Decision sequence for housing choice: identify needs and constraints, set a budget, define location and space criteria, screen alternatives, compare costs of ownership or rental, inspect, negotiate, and close or sign.

Total monthly housing cost for owners includes principal, interest, property taxes, insurance, utilities, maintenance, and association fees; renters add renter's insurance and utilities not included in rent.

Front-end ratio compares housing cost to income; back-end ratio compares total debt payments to income; lenders commonly use a back-end ceiling near 36-43 percent.

Location trade-offs are evaluated by commute cost and time, school quality, safety, services, and resale or rental demand; transportation cost can offset a lower purchase price.

Sunk and transaction costs matter: closing costs, moving costs, and realtor commissions reduce the break-even period for buying versus renting.

Consumer protection steps: obtain multiple quotes, verify licenses, read contracts fully, keep written records, and know cooling-off or cancellation rights where they apply.

Renters should document unit condition at move-in with dated photos and a signed checklist to protect the security deposit.

Fair housing law prohibits discrimination in sale or rental based on protected classes such as race, color, religion, sex, disability, familial status, and national origin.

Elements of design: line, form, space, mass, texture, color, and light; principles of design: balance, rhythm, emphasis, proportion and scale, harmony, and unity.

Balance types: symmetrical (mirror image), asymmetrical (equal visual weight from unlike objects), and radial (elements radiate from a center).

Rhythm is created by repetition, gradation, transition, radiation, and opposition; emphasis creates a focal point; harmony is agreement among parts, and unity is the total effect.

Color dimensions: hue (name), value (lightness or darkness), and intensity or chroma (saturation); tints add white, shades add black, and tones add gray.

Color schemes: monochromatic (one hue), analogous (adjacent hues), complementary (opposite hues), split-complementary, and triadic (three evenly spaced hues).

Color temperature: warm hues (red, orange, yellow) advance and can make a large room feel cozy; cool hues (blue, green, violet) recede and can make a small room feel larger.

Lighting layers: ambient (general), task (focused work), accent (highlighting), and decorative; light color rendering is measured by CRI and efficiency by lumens per watt.

Scale relates object size to room and human size; proportion relates parts to each other; the golden section ratio is approximately 1:1.618.

Circulation rules: main paths about 36-48 inches wide, secondary paths about 24-36 inches, and single-person passage at least 24 inches.

Kitchen work triangle connects sink, refrigerator, and range; the sum of the three legs should be roughly 13-26 feet, with no leg under about 4 feet or over about 9 feet.

Kitchen clearances: at least 36 inches between opposing counters in a work aisle, 42 inches when two cooks share the space, and 15 inches of landing space beside a sink or range.

Dining clearances: allow about 24 inches of table edge per seated diner and 36 inches from table edge to wall or obstacle for chair pull-out and passage.

Bedroom planning: allow about 24-30 inches beside a bed for making it and passage, and 36 inches at the foot of the bed for a main path.

Bathroom clearances: about 30 inches in front of a lavatory and toilet, 24 inches in front of a tub or shower, and 15 inches from toilet centerline to a side wall.

Adjacency zoning separates public (entry, living, dining), private (bedrooms, baths), and service (kitchen, laundry, utility) zones; plumbing is grouped on shared walls to cut cost.

Open-plan trade-offs: open plans improve sightlines and light but reduce acoustic privacy and require furniture arrangement to define functional zones.

Flooring comparison: hardwood is warm and refinishable but moisture-sensitive; ceramic tile resists water but is hard and cold; vinyl and laminate are economical but less refinishable; carpet adds acoustic and thermal comfort but traps soil and allergens.

Resilient flooring classes: sheet vinyl, luxury vinyl tile or plank, linoleum (linseed oil based), cork, and rubber; rubber is common in commercial and gym settings for slip and shock resistance.

Countertop materials: granite and quartz resist heat and stains (quartz is engineered and nonporous), solid surface is repairable and seamless, laminate is economical but heat-sensitive, and butcher block requires oiling.

Wood cabinet construction terms: face frame vs. frameless, overlay vs. inset doors, plywood vs. particleboard boxes, and dovetail or doweled drawer joints.

Upholstery durability is rated by double rubs (Wyzenbeek or Martindale); higher counts suit heavy residential or commercial use.

Fabric fibers: natural (cotton, linen, wool, silk) vs. synthetic (polyester, nylon, olefin); olefin and solution-dyed nylon resist moisture and fading well.

Paint finishes by sheen: flat hides imperfections but cleans poorly, eggshell and satin suit most walls, semi-gloss suits trim and kitchens, and gloss is most washable and reflective.

Material selection criteria: durability, maintenance, moisture and heat resistance, slip resistance (coefficient of friction), indoor air quality (low-VOC emissions), and life-cycle cost.

Smoke alarms should be on every level, inside and outside sleeping areas, and in bedrooms where required; carbon monoxide alarms belong near sleeping areas and on each level.

Radon is a colorless, odorless soil gas; test kits are inexpensive, and mitigation (sub-slab depressurization) is the standard fix when levels reach about 4 pCi/L or higher.

Lead paint hazard applies mainly to pre-1978 housing; disclose known lead hazards, use certified renovators for disturbing paint, and control dust.

Electrical safety: GFCI protection in kitchens, baths, garages, outdoors, and near water; AFCI protection for bedroom and living-area circuits; never overload circuits or use damaged cords.

Water heater safety: set tank thermostats near 120 degrees F to reduce scalding, and maintain the temperature-vs-Legionella trade-off; strap heaters in seismic zones and test the T&P valve.

Preventive maintenance schedule: HVAC filters monthly to quarterly, gutters twice a year, smoke alarm tests monthly, dryer vent cleaning annually, and roof and caulk inspection seasonally.

Sustainability concepts: energy efficiency (insulation, air sealing, efficient appliances), water conservation (low-flow fixtures, drought-tolerant landscaping), and durable, low-toxicity materials.

Indoor air quality controls: source control, ventilation (including mechanical and kitchen/bath exhaust), filtration (MERV rating), and moisture control to prevent mold growth.

Life-cycle stages commonly used in housing analysis: launching (single young adult), newly married or coupled, childbearing, child-rearing with preschoolers, child-rearing with school-age children, families with teens, launching of children, empty nest, retirement, and widowhood or late-life solo living.

Housing needs shift with stage: space and bedroom counts peak during child-rearing, budget pressure peaks with young children and again with college-age children, and accessibility needs rise in later stages.

Shelter is a basic need; Maslow-style ordering places shelter with physiological and safety needs, while status, privacy, and self-expression are higher-order housing motives.

Housing demand drivers: household formation, income, household size, age structure, and migration; household size and dwelling size are inversely related across stages (larger households often occupy relatively smaller per-person space).

Affordability benchmark: housing cost burden is commonly defined as gross housing cost exceeding 30 percent of gross household income; severe burden is 50 percent or more.

Crowding rule of thumb: more than one person per habitable room (excluding bathrooms and kitchens) is generally treated as crowded; more than 1.5 persons per room is severe crowding.

Universal design and visitability respond to aging and disability: no-step entry, wide doorways (about 32-36 inches clear), lever handles, and at least one full bath and bedroom on the entry level.

Housing tenure choice (own vs. rent) depends on expected length of stay, mobility needs, tax treatment, transaction costs, and down-payment capacity; short expected tenure favors renting.

Decision sequence for housing choice: identify needs and constraints, set a budget, define location and space criteria, screen alternatives, compare costs of ownership or rental, inspect, negotiate, and close or sign.

Total monthly housing cost for owners includes principal, interest, property taxes, insurance, utilities, maintenance, and association fees; renters add renter's insurance and utilities not included in rent.

Front-end ratio compares housing cost to income; back-end ratio compares total debt payments to income; lenders commonly use a back-end ceiling near 36-43 percent.

Location trade-offs are evaluated by commute cost and time, school quality, safety, services, and resale or rental demand; transportation cost can offset a lower purchase price.

Sunk and transaction costs matter: closing costs, moving costs, and realtor commissions reduce the break-even period for buying versus renting.

Consumer protection steps: obtain multiple quotes, verify licenses, read contracts fully, keep written records, and know cooling-off or cancellation rights where they apply.

Renters should document unit condition at move-in with dated photos and a signed checklist to protect the security deposit.

Fair housing law prohibits discrimination in sale or rental based on protected classes such as race, color, religion, sex, disability, familial status, and national origin.

Elements of design: line, form, space, mass, texture, color, and light; principles of design: balance, rhythm, emphasis, proportion and scale, harmony, and unity.

Balance types: symmetrical (mirror image), asymmetrical (equal visual weight from unlike objects), and radial (elements radiate from a center).

Rhythm is created by repetition, gradation, transition, radiation, and opposition; emphasis creates a focal point; harmony is agreement among parts, and unity is the total effect.

Color dimensions: hue (name), value (lightness or darkness), and intensity or chroma (saturation); tints add white, shades add black, and tones add gray.

Color schemes: monochromatic (one hue), analogous (adjacent hues), complementary (opposite hues), split-complementary, and triadic (three evenly spaced hues).

Color temperature: warm hues (red, orange, yellow) advance and can make a large room feel cozy; cool hues (blue, green, violet) recede and can make a small room feel larger.

Lighting layers: ambient (general), task (focused work), accent (highlighting), and decorative; light color rendering is measured by CRI and efficiency by lumens per watt.

Scale relates object size to room and human size; proportion relates parts to each other; the golden section ratio is approximately 1:1.618.

Circulation rules: main paths about 36-48 inches wide, secondary paths about 24-36 inches, and single-person passage at least 24 inches.

Kitchen work triangle connects sink, refrigerator, and range; the sum of the three legs should be roughly 13-26 feet, with no leg under about 4 feet or over about 9 feet.

Kitchen clearances: at least 36 inches between opposing counters in a work aisle, 42 inches when two cooks share the space, and 15 inches of landing space beside a sink or range.

Dining clearances: allow about 24 inches of table edge per seated diner and 36 inches from table edge to wall or obstacle for chair pull-out and passage.

Bedroom planning: allow about 24-30 inches beside a bed for making it and passage, and 36 inches at the foot of the bed for a main path.

Bathroom clearances: about 30 inches in front of a lavatory and toilet, 24 inches in front of a tub or shower, and 15 inches from toilet centerline to a side wall.

Adjacency zoning separates public (entry, living, dining), private (bedrooms, baths), and service (kitchen, laundry, utility) zones; plumbing is grouped on shared walls to cut cost.

Open-plan trade-offs: open plans improve sightlines and light but reduce acoustic privacy and require furniture arrangement to define functional zones.

Flooring comparison: hardwood is warm and refinishable but moisture-sensitive; ceramic tile resists water but is hard and cold; vinyl and laminate are economical but less refinishable; carpet adds acoustic and thermal comfort but traps soil and allergens.

Resilient flooring classes: sheet vinyl, luxury vinyl tile or plank, linoleum (linseed oil based), cork, and rubber; rubber is common in commercial and gym settings for slip and shock resistance.

Countertop materials: granite and quartz resist heat and stains (quartz is engineered and nonporous), solid surface is repairable and seamless, laminate is economical but heat-sensitive, and butcher block requires oiling.

Wood cabinet construction terms: face frame vs. frameless, overlay vs. inset doors, plywood vs. particleboard boxes, and dovetail or doweled drawer joints.

Upholstery durability is rated by double rubs (Wyzenbeek or Martindale); higher counts suit heavy residential or commercial use.

Fabric fibers: natural (cotton, linen, wool, silk) vs. synthetic (polyester, nylon, olefin); olefin and solution-dyed nylon resist moisture and fading well.

Paint finishes by sheen: flat hides imperfections but cleans poorly, eggshell and satin suit most walls, semi-gloss suits trim and kitchens, and gloss is most washable and reflective.

Material selection criteria: durability, maintenance, moisture and heat resistance, slip resistance (coefficient of friction), indoor air quality (low-VOC emissions), and life-cycle cost.

Smoke alarms should be on every level, inside and outside sleeping areas, and in bedrooms where required; carbon monoxide alarms belong near sleeping areas and on each level.

Radon is a colorless, odorless soil gas; test kits are inexpensive, and mitigation (sub-slab depressurization) is the standard fix when levels reach about 4 pCi/L or higher.

Lead paint hazard applies mainly to pre-1978 housing; disclose known lead hazards, use certified renovators for disturbing paint, and control dust.

Electrical safety: GFCI protection in kitchens, baths, garages, outdoors, and near water; AFCI protection for bedroom and living-area circuits; never overload circuits or use damaged cords.

Water heater safety: set tank thermostats near 120 degrees F to reduce scalding, and maintain the temperature-vs-Legionella trade-off; strap heaters in seismic zones and test the T&P valve.

Preventive maintenance schedule: HVAC filters monthly to quarterly, gutters twice a year, smoke alarm tests monthly, dryer vent cleaning annually, and roof and caulk inspection seasonally.

Sustainability concepts: energy efficiency (insulation, air sealing, efficient appliances), water conservation (low-flow fixtures, drought-tolerant landscaping), and durable, low-toxicity materials.

Indoor air quality controls: source control, ventilation (including mechanical and kitchen/bath exhaust), filtration (MERV rating), and moisture control to prevent mold growth.