ARCON PPCE key terms

A written set of ethical and behavioural rules that members of a professional institute agree to follow, covering competence, honesty, confidentiality, conflict of interest, and public safety. Breaches can lead to disciplinary action or loss of licence.

A situation where a professional's personal, financial, or family interest could improperly influence professional judgement or decisions on a project. It must be disclosed promptly in writing so the client can decide how to manage or remove it.

The degree of skill, diligence, and judgement that a reasonably competent practitioner in the same field would exercise under similar circumstances. It is the benchmark used to judge whether professional services were performed properly.

Failure to exercise the standard of care expected of a competent practitioner, causing loss to the client or others. It requires a duty of care, a breach of that duty, causation, and demonstrable damage.

Insurance that protects a design professional against claims alleging negligent work, errors, or omissions in the services provided. It typically covers legal defence costs and settlements up to a stated limit per claim.

A legal obligation to act in the client's best interest rather than one's own, exercising loyalty, good faith, and full disclosure. Architects owe this duty in handling project funds, awarding contracts, and advising on procurement.

The licensed architect whose name and seal appear on the permit drawings and who accepts legal responsibility for the design and construction documents. This role may differ from the design architect or the architect who supervises construction.

The first design phase, in which concept options, spatial relationships, massing, and approximate costs are explored with the client. Deliverables are usually loose drawings and a preliminary programme, not construction documents.

The phase between schematic design and construction documents where the chosen concept is refined into resolved plans, sections, elevations, materials, and systems. It fixes the design intent and gives a firmer cost basis.

The final, coordinated drawings, specifications, and schedules used for permitting, bidding, and building. They must convey the design intent clearly enough for contractors to price and construct the work.

The systematic process of identifying and documenting a client's needs, activities, space requirements, and constraints before design begins. Its output, the brief or programme, becomes the yardstick for evaluating later design decisions.

The outer shell of a building, including walls, roof, windows, doors, and foundations, that separates interior from exterior. It controls heat, air, and moisture flow and largely determines energy performance.

A path of high-conductivity material, such as a steel beam or concrete slab edge, that bypasses insulation and allows heat to flow through the envelope. It lowers effective R-value and can cause condensation.

A membrane or coating with low moisture permeability, installed to limit water vapour diffusion through the building envelope. Correct placement relative to insulation and climate is essential to avoid trapping moisture.

A wall that carries vertical loads from floors and roof down to the foundation, in addition to its own weight. Removing or altering it requires structural analysis and temporary support during construction.

A wall designed to resist lateral forces such as wind and earthquakes by transferring them to the foundation. It is usually stiff in its own plane and may be reinforced concrete, masonry, or braced timber.

The regular layout of columns and beams, defined by spacing dimensions, that organises a building's structural frame. It strongly influences planning, spans, and services routing.

Concrete with embedded steel bars that resist tensile forces the concrete alone cannot carry. The steel must be properly positioned, lapped, and covered to protect it from corrosion and fire.

A prestressing method in which steel tendons are tensioned after concrete has hardened, compressing the concrete to resist loads. It allows longer spans and thinner slabs but imposes strict limits on later drilling or cutting.

The combined heating, ventilation, and air-conditioning equipment and ductwork that controls temperature, humidity, and air quality in a building. Its space, plant, and riser requirements must be coordinated early in design.

The process of resolving the spatial and technical conflicts among mechanical, electrical, plumbing, and fire systems within ceilings, risers, and plant rooms. It prevents clashes and preserves required access and clearances.

An automatic suppression system of pipes and heads that discharges water when heat activates a head. Design must satisfy the applicable code for coverage, water supply, and head spacing.

The continuous, unobstructed path from any point in a building to a public way, comprising exit access, exit, and exit discharge. Widths, travel distances, and door hardware are governed by code.

The code-defined category of a building or space based on its use, such as residential, assembly, or storage. It determines allowable height, area, egress, and fire-resistance requirements.

Official authorisation issued by the local authority allowing construction or alteration to proceed in accordance with approved drawings. Work started without it is unlawful and may be ordered to stop.

A document issued by the building authority confirming that a completed building complies with approved plans and codes and may lawfully be used. It is normally required before handover or business operation.

A written project document describing materials, products, workmanship, and testing requirements that cannot be shown clearly on drawings. It forms part of the contract documents and takes precedence where conflicts arise.

An itemised schedule of measured work quantities prepared from the drawings and specification, used for tendering and valuation of variations. It provides a common basis for comparing contractor prices.

A formal written instruction authorising a change to the scope, design, or timing of the works, usually with a valuation of cost and time effects. It protects both parties by recording agreed adjustments to the contract.

The stage at which the works are substantially finished and fit for use, with only minor defects outstanding. It triggers handover, release of retention, and the start of the defects liability period.

A percentage of each payment withheld by the client to secure performance and remedy defects. It is typically released in parts at practical completion and at the end of the defects liability period.

A scheduling technique that identifies the longest sequence of dependent activities determining the project duration. Delays on the critical path directly extend completion, while float exists only on non-critical activities.

A measure of how much heat passes through one square metre of a building element per degree of temperature difference, expressed in W/m2K. Lower values indicate better insulation and are set by energy codes.

Design strategies that use form, orientation, shading, and thermal mass to maintain comfort with minimal mechanical energy. Done well at concept stage, it reduces operating costs and carbon emissions over the building's life.

A method of quantifying environmental impacts of a building or material across extraction, manufacture, use, and disposal. It supports comparison of options and informs embodied-carbon reduction targets.

The total greenhouse gas emissions associated with extracting, manufacturing, transporting, installing, and eventually disposing of building materials. It is distinct from operational carbon and is measured over a declared life cycle.