The Architectural Client’s Glossary: Planning, Design, and Build Terms Explained

If you’re planning a home extension, renovation, or new build, you’ll quickly encounter architectural and construction terms that aren’t always self-explanatory. This glossary breaks down some of the most common planning, design, and build terminology in clear, straightforward language, helping you feel more confident throughout the process.

Planning & Early Design Terms

Residential property during construction.

Feasibility Study: An early-stage assessment that considers whether a project is viable. It looks at planning constraints, budget, site conditions, and timescales before design work progresses.

Measured Survey: A detailed survey of an existing building or site, recording accurate dimensions and key features used to inform architectural drawings.

Concept Design: The first design stage where layout options, massing, and overall design direction are explored.

Planning Permission: Formal consent from the local authority allowing development to proceed.

Permitted Development: A set of allowances enabling certain works to be carried out without full planning permission, subject to limits and conditions.

Design Development & Technical Terms

Open-plan living space within a residential extension, demonstrating developed architectural design

RIBA Stages: A structured framework defining the stages of an architectural project, from initial brief through to completion and use.

Technical Drawings: Detailed drawings showing construction methods, materials, and dimensions, used for building regulations approval and on site.

Building Regulations: Statutory requirements covering safety, energy efficiency, accessibility, drainage and structural performance.

Tendering & Construction Terms

Residential new build property, illustrating the construction phase

Tender Process: The process of inviting contractors to submit prices based on detailed drawings and specifications.

Principal Designer: Typically the architect, responsible for administering the building contract and monitoring construction progress.

Practical Completion: The point at which the building work is complete enough to be occupied, aside from minor outstanding items.

Snagging: A list of small defects or incomplete works identified towards the end of the project.

Understanding architectural terminology makes the entire design and build process clearer and more collaborative. When you know what key terms mean — and when they apply — you’re better equipped to make informed decisions and feel confident at every stage of your project.

A good architect will always explain the process clearly, but having this foundational knowledge helps ensure conversations are productive from the outset.

If you’re considering a renovation, extension, or new build and would like guidance tailored to your property, Karenna Wilford Architects offer a clear, supportive approach from early feasibility through to completion.

Get in touch to discuss your project and understand what’s possible before you begin.