Architects get a mixed reputation among homeowners. Some describe theirs as indispensable: a creative partner who took their half-formed ideas and turned them into something far better than they imagined. Others describe the experience as frustrating, expensive and disconnected from what they actually wanted. The difference is almost always in how the relationship is set up at the start.
Your architect works for you. Not for the planning authority, not for the builder, not for their portfolio. Understanding that relationship, managing it properly, and knowing what you're entitled to expect makes an enormous difference to the quality of the outcome.
Do You Actually Need an Architect?
Not always. For a simple loft conversion or single-storey rear extension, an architectural technologist or draughtsperson can prepare the drawings you need for planning and building regulations at lower cost. For complex projects, listed buildings, sites with unusual planning constraints, or anything where the design needs to be genuinely considered rather than templated, an architect earns their fee.
Architects are RIBA-registered (Royal Institute of British Architects) and ARB-regulated (Architects Registration Board). The title "architect" is legally protected: only registered individuals can use it. "Architectural designer" and "architectural consultant" are not protected titles, so check credentials carefully before appointing anyone.
For an extension project in the range of £80,000-£200,000, an architect's fee for the full service (design through contract administration) will typically be 8-15% of the construction cost. For a £120,000 project, that's £9,600-£18,000. This is real money, but a good architect who keeps costs controlled and reduces errors typically saves more than their fee. A bad one, or a mismatch between client and architect, costs significantly more.
The RIBA Plan of Work
The RIBA Plan of Work defines standard project stages that most architects use as a framework. Understanding these helps you know what you're being charged for at each stage and what should be delivered:
Stage 0-1: Strategic Definition and Preparation. Initial brief, site assessment, feasibility, constraints review. Output: a confirmed brief and an indication of whether the project is viable.
Stage 2: Concept Design. The architect develops initial design options for discussion. This is where the creative conversation happens. You should see sketch designs, sections, and often 3D visualisations. Output: a concept design that both you and the architect are satisfied captures your vision.
Stage 3: Spatial Coordination (formerly Developed Design). The concept design is developed into a coordinated scheme with structural and services engineers involved. Output: a coordinated design ready for planning application.
Stage 4: Technical Design. Full construction information, specifications and detail drawings. Building regulations application. Output: a package of information a contractor can price and build from.
Stage 5: Construction. The architect administers the contract, inspects works on site, certifies payments, and handles variations. This stage is optional but valuable. Many homeowners appoint their architect only for Stages 0-4 and manage the build themselves, which is a legitimate approach but requires more time from you.
Writing a Good Brief
The quality of the brief you give your architect directly determines the quality of the design you get back. A vague brief produces an architect's interpretation of what you want. A detailed brief produces something much closer to what you actually want.
A useful brief includes:
- What rooms or spaces you need and why
- How each space will be used and by whom
- Relationships between spaces that matter to you (kitchen open to garden, master bedroom away from street noise, etc.)
- Your aesthetic preferences, with reference images if helpful
- Your budget, clearly stated, with a note on whether it's firm or flexible
- Anything you dislike about the current arrangement
- Any specific requirements (accessibility, energy performance targets, storage needs)
- Your timeline and any fixed dates
Bring this to your first meeting. Don't worry if it's imperfect. A good architect will ask questions that sharpen it. What you want to avoid is being too open-ended: "I'll know what I like when I see it" is not a brief, and it leads to multiple rounds of revisions, each of which costs time and sometimes money.
Understanding Architect Fees
Architect fees are charged in various ways. The most common structures are:
Percentage of construction cost. The traditional model. The fee scales with the project, which aligns the architect's interest with managing costs. The downside is that if costs rise, the fee rises too. Ask whether the percentage is calculated on the estimate at appointment or on actual final costs.
Fixed lump sum per stage. Provides certainty at each stage. Useful if you want to appoint stage by stage rather than committing to the full service upfront.
Hourly or day rate. Appropriate for small advisory work or feasibility studies. Expensive for anything substantial because the hours tend to accumulate.
Get the fee arrangement in writing before any work begins. The RIBA publishes a standard appointment document (the RIBA Domestic Professional Services Contract) that is specifically designed for homeowner projects and is strongly recommended. It sets out services, fees, and responsibilities clearly and protects both parties.
Staying in Control of Your Vision
Architects are creative professionals and some have strong aesthetic preferences. This can be an asset when your tastes align, and a problem when they don't. A few things help:
Review designs critically and honestly. If something doesn't work for you, say so clearly and specifically. "I don't like this" is less useful than "the open-plan living area doesn't work for us because we need a separate quiet space for the children." Specific feedback leads to specific solutions.
Don't be overruled on your own house. An architect may explain why a design decision is architecturally superior, and their reasoning might be right. But it's your house and your money. You don't have to be adversarial about it, but you're entitled to say: "I understand your reasoning. I still prefer the other option."
Set milestone review points with agreed outputs. Don't let the design drift. At the end of Stage 2, you should have a concept design you're genuinely happy with before Stage 3 begins. Going into detailed design with a Stage 2 you're lukewarm about leads to expensive late changes.
Ask to see previous projects similar to yours before appointment. An architect who primarily does commercial work may not be the right choice for a sensitive residential extension. Similarly, an architect with a strong modernist aesthetic may not be the right choice if you want something traditional. Their portfolio tells you more than their brochure.
The Planning Application
For most residential projects requiring planning permission, your architect prepares and submits the application. This includes the application forms, drawings (location plan, site plan, existing and proposed floor plans and elevations), design and access statement, and any supporting documents required by the council.
Planning applications take a minimum of 8 weeks for a decision (13 weeks for major applications). The council may request additional information or drawings during this period. Your architect should manage this correspondence and advise you on how to respond.
If the council issues pre-application advice, use it. Many councils offer a paid pre-application service where a planning officer reviews the proposal informally before a formal application is submitted. This can identify problems early and significantly improve the chances of a successful application, particularly for more sensitive sites.