Architect vs Architectural Technologist in London: Who Should Draw Your Extension?

What does a RIBA-chartered architect actually do?

An architect in the UK is someone entitled to use the title "architect", which is protected under the Architects Act 1997 and policed by the Architects Registration Board (ARB). To register, an architect completes a long academic and professional route — typically a Part 1 degree, a Part 2 (usually a masters), a period of practical experience, and the Part 3 professional exam — before joining the ARB register. Many, though not all, are also members of the Royal Institute of British Architects (RIBA) and use the label "RIBA-chartered".

Architects are trained heavily in design: concept, spatial planning, form, light, and the creative shaping of a building. That training is genuinely valuable on complex, bespoke, or heritage-sensitive projects where the design itself is the hard part — a full house remodel, an unusual site, a sensitive conservation-area scheme, or a new-build. They can run a project from first sketch through to site inspection, and coordinate structural engineers and other consultants.

What does a chartered architectural technologist do?

A chartered architectural technologist is a member of the Chartered Institute of Architectural Technologists (CIAT) and carries the designation MCIAT. The specialism is architectural technology — the science and detailing of how buildings are put together, how they perform, and how they satisfy the Building Regulations. Where the architect's centre of gravity is design, the technologist's is technical delivery: turning a design into an accurate, buildable, compliant set of drawings.

For the overwhelming majority of London householder work — rear and side extensions, loft conversions, garage conversions, internal remodelling, and change-of-use schemes — the drawings are governed less by artistic invention and more by getting the technical package right: correct dimensions, sound construction detailing, Part L thermal performance, Part B fire safety, structural coordination, and a planning submission that reads cleanly to a busy case officer. That is squarely the technologist's discipline.

Who is allowed to submit planning and building-regs drawings in London?

This is the question that matters most, and the answer surprises people: for a normal householder project there is no law reserving planning or building-regulation drawings to a registered architect. London borough planning departments and building control bodies assess the drawings on their technical merit and compliance — not on whether the author holds the protected title "architect".

A chartered architectural technologist can prepare and submit a full householder planning application through the Planning Portal and a complete building-regulations package for a full-plans application or building notice. The council will accept a competent, compliant set regardless of whether an architect or a technologist drew it. What you should never do is rely on cheap templated drawings from someone with no accountable qualification — that is where refusals and rejected building-regs submissions come from, not from the choice between architect and technologist.

How do the fees compare for a London extension or loft?

Fees vary by project scope, borough, and how a practice charges — some quote a fixed fee, others a percentage of build cost. As a general pattern across London in 2026, a chartered architectural technologist tends to charge a lower fee than a full-service architect for the same standard extension or loft, because the technologist's model is geared to producing the technical drawing package efficiently rather than to an extended, design-led service.

The figures below are illustrative London ranges for a straightforward single-storey rear extension or loft conversion, to show the shape of the difference — not fixed quotes. Always get a written scope so you are comparing like for like: a low headline fee that excludes the building-regulations package or a measured survey is not really cheaper. At DrawingsDirect we work to fixed fees with a roughly seven-day turnaround and free redraws to approval, which removes the guesswork from budgeting.

When should a London homeowner choose which?

Match the professional to the problem. If your project is design-heavy, architecturally ambitious, on a difficult or heritage-sensitive site, or you want a single consultant to lead a complex build end to end, an architect's design depth earns its fee. If your project is a well-understood extension, loft, garage conversion, or internal remodel — the bulk of London householder work — a chartered architectural technologist gives you the same council-accepted drawings with a technical focus and typically a lower fee. The smartest move is to describe your actual scheme, get written fixed-fee quotes from both, and choose on fit and value rather than on the title on the letterhead.

• Standard rear or side extension: technologist is usually the efficient, lower-cost choice.
• Loft or garage conversion: technologist — the work is detailing-led and code-driven.
• Bespoke whole-house remodel or unusual site: an architect's design depth may be worth the premium.
• Listed building or sensitive conservation area: prioritise heritage experience, whichever route you pick.
• Tight budget, clear brief: a fixed-fee technologist removes cost uncertainty.