Housing and Interior Design
Housing and Interior Design
This domain tests housing needs, space planning, design principles, universal design, safety, and sustainable choices. Questions often ask you to improve a floor plan or justify a design decision for a specific user.
Core rules and concepts
- Design elements are line, form, space, texture, color, and light. Principles include balance, rhythm, emphasis, proportion/scale, and unity.
- Space planning uses zones, traffic patterns, and clearances. Furniture must fit both the room and the user; scale drawings prevent costly errors.
- Universal design supports people of different ages and abilities: zero-step entries, lever handles, adjustable counters, and wide clearances.
- Safety includes egress, stair rails, grab bars, electrical outlet placement near water, and non-slip surfaces.
- Housing affordability is typically measured as shelter costs at or below 30% of gross household income; the burden rises when utilities and transportation are included.
- Sustainability includes energy-efficient lighting, insulation, water-saving fixtures, durable materials, and indoor air quality.
Worked example
An older adult wants to age in place in a small bathroom. A weak plan adds decorative shelving but keeps a high tub wall. A stronger plan uses a curbless shower, grab bars, a handheld shower, lever faucets, non-slip flooring, and blocking in the walls for future supports. The reasoning: the user’s changing ability and safety drive the design; aesthetics come after access and function.
Traps
Do not prioritize style over circulation, egress, or safety. Do not scale furniture by eye; use dimensions. Do not confuse universal design with accessible design only for wheelchair users; universal design benefits a broad range. Do not ignore lighting, ventilation, and moisture control. Do not assume a large room automatically functions well.