How to Choose an Architect in London — A Practical Guide for Homeowners

Many homeowners are unsure what an architect's role covers on a typical extension or loft conversion. The architect's scope typically includes:

**Design**: developing the project from initial ideas to a full design scheme — space planning, massing, materials, connection to the existing house, daylight, and external appearance.

**Planning drawings**: preparing the drawings required for a Householder Planning Application (location plan, site plan, floor plans, elevations, sections) and submitting the application on your behalf.

**Design and Access Statement**: where required (typically for Conservation Area applications), preparing the written statement explaining the design rationale.

**Technical drawings (Building Regulations / construction drawings)**: preparing the detailed drawings from which the contractor can build — more detailed than the planning drawings, showing structural opening positions, window and door schedules, insulation details, roof details, and finishes. These also go to Building Control for approval.

**Specification**: writing the specification of materials and workmanship standards that the contractor must meet.

**Project management / Contract Administration (optional)**: if appointed in a full contract administration role, the architect issues instructions, certifies payment valuations, manages variations, and signs off practical completion. On many residential projects, the homeowner manages the contractor directly and the architect's role ends at Building Regulations stage.

• **What architects do not do** (unless separately arranged):
• •Structural engineering calculations (a separate structural engineer appointment)
• •Party wall surveying (a separate party wall surveyor appointment)
• •CDM coordination (a separate role, though some architects take this on)
• •Cost estimating with the accuracy of a QS

Architectural fees on residential projects are typically structured in one of three ways:

**Percentage of construction cost**: the traditional model — 8–15% of the total build cost for a full service (design, planning, Building Regulations, contract administration). At 10% of a £100,000 extension, this is £10,000 over the full service.

• **Fixed fee for defined stages**: the more common model for residential projects — a fixed fee is agreed for each stage:
• •Stage 1 (feasibility / concept design): £1,000–£2,500
• •Stage 2 (planning application drawings): £2,000–£5,000
• •Stage 3 (Building Regulations / technical drawings): £2,000–£4,000
• •Stage 4 (contract administration): £3,000–£8,000

**Hourly rate**: less common, but some architects (particularly sole practitioners) work on hourly rates (£80–£200 per hour in London). This works if you want to use an architect for a specific task rather than a full service.

• **What affects the fee**:
• •Complexity of the project (Conservation Area, listed building, or unusual structural conditions add complexity)
• •Whether full contract administration is required (or the homeowner manages the contractor directly)
• •The architect's experience, reputation, and overhead structure (large practice vs sole practitioner)

**The design-and-build alternative**: in a design-and-build arrangement, the contractor includes an in-house designer or works with a preferred architect as part of the pre-construction package. This can be more cost-effective than a separate architect appointment, especially for standard residential projects. The trade-off is that the design is developed alongside (and partly in service of) the construction intent — which some clients prefer, and others do not.

**1. Local Conservation Area and planning experience** The most important factor for most London residential projects. An architect who has successfully navigated planning applications in your specific borough and Conservation Area (if applicable) understands what the local planning authority will and won't accept. Ask specifically: have you done work in this area, and what was the outcome of those applications?

**2. Residential experience at your project scale** Some architects primarily do commercial work and take occasional residential projects. Others specialise in residential extensions and loft conversions. Look for recent, completed examples of the type of project you are doing — not just images of large or unusual projects.

**3. Communication style and responsiveness** Poor communication is one of the most common client complaints about architects. At the initial meeting, assess how well the architect listens, whether they understand your brief, and how quickly they respond to your emails and calls. Ask for client references and speak to previous clients.

**4. Clarity on fee scope** A clearly defined fee agreement that specifies exactly what is included at each stage protects you from scope creep and unexpected additional charges. Be wary of architects who provide vague fee estimates without a defined scope.

**5. Ability to work with your build team** If you already have a preferred contractor (or if you intend to use a design-and-build firm), the architect must be able to work effectively with that team. Ask whether the architect has worked with design-and-build contractors before.

**6. Structural and technical awareness** A good architect produces technically sound drawings that the contractor can build from. Poor technical drawings — with inadequate structural information, ambiguous material specifications, or missing details — create problems on site. Ask to see a sample specification or technical drawing set.

When meeting a potential architect for the first time, ask:

• •Have you completed projects in this specific area and, if in a Conservation Area, with this specific local authority's planning team?
• •Can you show me comparable completed projects (not just renders) including planning approval and build completion?
• •How do you structure your fees, and exactly what does each stage cover?
• •What is your typical timescale from appointment to planning submission?
• •Who will be my main point of contact throughout the project?
• •Will you prepare technical/Building Regulations drawings as well as planning drawings, and at what additional fee?
• •Do you offer contract administration, and do you recommend it for a project of this type?
• •Have you worked with design-and-build contractors or principal contractors, and do you recommend them for this type of project?
• •Can I speak to two recent clients about their experience?

An architect who resists reference checks or whose answers are vague about scope, fee structure, or past project outcomes should be approached cautiously.