BPC/VBA Building Design (Draftsperson) Exam key terms

The category assigned to a building or part of it based on how it is used, such as residential, office, retail or storage. The classification sets the fire, egress and construction requirements that apply.

The continuous protected route from any point in a building to a public road or open space, including doorways, corridors, stairs and exits. It must remain clear, adequately wide and protected from fire and smoke.

A rating expressing how long a building element resists structural failure, fire penetration and heat transmission under standard fire test conditions, usually stated in minutes for three criteria.

The division of a building into fire-separated zones by fire-rated walls, floors and doors, intended to limit fire and smoke spread and to give occupants time to escape safely.

The measured length of the escape route from the most remote point on a floor to the nearest exit or safe place. Codes cap this distance according to occupancy and fire protection provided.

The formal statutory approval allowing construction or alteration work to proceed. Drawings and documentation submitted for the permit must demonstrate compliance with applicable codes and planning controls.

The planning consent granted by a local authority for the use or development of land. It typically precedes or accompanies building approval and may impose conditions that shape the design.

The minimum distance required between a building and a property boundary, road or other feature. Setbacks control light, privacy, landscaping and streetscape and are specified in planning instruments.

The ratio of total building floor area to the area of the site. Planners use it to control development density and building bulk, often alongside height and setback limits.

A scaled drawing showing the site boundaries, building footprint, levels, access, parking, services and surrounding context. It locates the proposed work relative to boundaries and existing features.

A line on a drawing joining points of equal ground level. Contours reveal slope and drainage direction and inform cut and fill, retaining wall and building platform decisions.

A surveyed ground or floor elevation marked at a specific point on a drawing. Spot levels supplement contours and are used to set finished floor levels and verify drainage falls.

The earthworks of removing soil (cut) and placing it elsewhere (fill) to create a level building platform or road. Balanced cut and fill reduces cartage costs and site disturbance.

The fixed ratio between a dimension on a drawing and the real dimension it represents, such as 1:100. Correct scale selection balances the detail shown against the sheet size available.

The bordered panel on a drawing sheet recording project name, drawing number, revision, scale, date, author and approval status. It controls document identification and traceability.

A scalloped outline drawn around changed portions of a drawing so reviewers can quickly locate amendments. Each cloud is cross-referenced to a revision note or number.

A controlled list of all drawings issued on a project, showing numbers, titles, revisions, dates and recipients. It tracks the current status of every document and prevents outdated drawings being used.

A formal record accompanying documents sent to another party, listing what was issued, its revision and the purpose. It provides evidence of delivery and forms part of the project record.

A written query issued to the designer or consultant seeking clarification of drawings, specifications or instructions. Responses are logged and may trigger a formal design change.

A formal change to the scope, design or contract documents after the contract is executed. Variations are documented, priced and approved before the affected work proceeds.

A drawing revised to record the constructed condition, including deviations from the original design. It supports future maintenance, alterations and statutory records.

A detail drawing prepared by a fabricator or contractor showing how a component will actually be made and installed. It is checked against the design intent before fabrication begins.

A large-scale drawing showing the construction of a specific junction or component, with materials, dimensions, fixings and tolerances. It resolves how assemblies come together on site.

A drawing presenting the overall layout of a building or system, showing the position of major elements without construction-level detail. It orients readers before they consult detail drawings.

A view produced by cutting through a building and looking in one direction, revealing internal heights, floor-to-floor dimensions and construction layers. Sections are essential for coordinating structure and services.

A path of high heat conductance through the building envelope, such as a slab edge or steel lintel, that bypasses insulation. It lowers thermal performance and can cause condensation.

Material with low heat conductivity installed in roofs, walls and floors to resist heat flow. Correct thickness, continuity and installation determine the achieved energy performance of the envelope.

A low-permeability membrane placed on the warm side of insulation to restrict moisture-laden air from reaching cold surfaces. Correct placement and sealing reduce interstitial condensation risk.

The formation of water when moist air meets a surface below its dew point. In buildings it can occur on visible surfaces or hidden within construction, causing mould and material damage.

The detailing of joints, flashings, seals and membranes that keeps rain, wind and moisture out of the building envelope. Poor weatherproofing is a common source of building defects.

A thin impervious material formed and fixed to shed water at junctions such as roof-to-wall, parapets and openings. Correct laps and upstands prevent water tracking into the construction.

A continuous moisture-resistant layer built into a wall near ground level to stop rising damp reaching internal finishes. It must be lapped with the damp-proof membrane under the floor.

A wall that carries and transfers loads from floors and roofs down to the foundations. Altering or removing one requires structural design because the load path must be maintained.

A horizontal structural member spanning an opening in a wall to carry the load above it. Its size and bearing length depend on span and the load imposed.

A system of reference lines, usually numbered and lettered, used to locate columns, walls and major elements consistently across drawings. It allows precise coordination between disciplines.

The process of checking combined models or overlays of different disciplines to find physical conflicts, such as a duct intersecting a beam. Early detection avoids costly site rework.

The arrangement of structural, mechanical, electrical and hydraulic elements so they fit within available zones without conflict. It considers falls, clearances, access for maintenance and penetration locations.

Designing buildings and spaces so they can be used by people of all ages and abilities without adaptation. It addresses access, circulation, reach ranges, contrasts and sanitary facilities.

A continuous path that meets minimum width, gradient, surface and clearance requirements so people using wheelchairs or with limited mobility can travel independently. It links entries, amenities and exits.

The obligation of a draftsperson to exercise the skill and judgement reasonably expected of a competent practitioner, avoiding foreseeable harm to clients and the public. Breach can give rise to negligence claims.

A situation where a personal, financial or other interest could improperly influence professional judgement. It must be disclosed promptly and managed openly, often by withdrawal from the affected decision.

The professional obligation not to disclose client information or project data without authority. It protects commercial and personal information and continues after a project engagement ends.