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Cost GuidesUpdated May 2026By TradeMatch Editorial Team·10 April 2026·Updated 12 April 2026·6 min read
Architect Costs UK 2026: Fees, Services & When You Need One
Hiring an architect can make the difference between a good home improvement project and a great one. Here is what architects charge in the UK, what their fees include, and when you should hire one.
Architect Fee Structures
| Fee Basis | Typical Range |
|---|---|
| Percentage of build cost | 5–15% of total construction cost |
| Fixed fee (small project) | £1,500–£5,000 |
| Fixed fee (extension) | £3,000–£8,000 |
| Fixed fee (new build) | £10,000–£30,000+ |
| Planning drawings only | £1,000–£3,000 |
| Hourly rate | £50–£120/hour |
Percentage-based fees are most common for larger projects. The percentage decreases as build cost increases (15% for a £50k project, 8–10% for a £200k+ project).
Fixed fees work best for well-defined projects like a single extension or loft conversion where the scope is clear from the outset.
| Project | Typical Build Cost | Architect Fee (10%) |
|---|---|---|
| Rear extension | £30,000–£60,000 | £3,000–£6,000 |
| Loft conversion | £40,000–£65,000 | £4,000–£6,500 |
| Two-storey extension | £50,000–£100,000 | £5,000–£10,000 |
| New build house | £150,000–£400,000 | £15,000–£40,000 |
What Does an Architect Do?
RIBA Work Stages:
1. Stage 0–1: Briefing — Understanding your needs, budget, site constraints
2. Stage 2: Concept Design — Initial design options, feasibility studies
3. Stage 3: Spatial Coordination — Detailed design, structural layout, specifications
4. Stage 4: Technical Design — Construction drawings, building regulations, tender documents
5. Stage 5: Manufacturing & Construction — Site inspections, contractor management, sign-off
You can hire an architect for all stages or just specific ones. Many homeowners hire an architect through to planning permission (Stages 0–3) then use a builder or project manager for construction.
Architect vs Architectural Technician:
- Architect (ARB registered) — Full design service, complex projects, creative design
- Architectural Technician (CIAT) — Technical drawings, building regulations, cost-effective for straightforward projects
- Architectural Designer — No protected title, quality varies. Check portfolio and references carefully.
Frequently Asked Questions
Do I need an architect for an extension?
Legally no, but an architect adds significant value for extensions over £30,000. They maximise space, handle planning applications, ensure building regulations compliance, and often save more in build efficiency than their fee costs. For small single-storey extensions, an architectural technician or building designer may be sufficient.
How do I find a good architect?
Start with the RIBA Find an Architect service or ask for recommendations from friends who have completed similar projects. Always check: ARB registration (legal requirement to use the title Architect), professional indemnity insurance, portfolio of similar projects, and client references. Meet at least 2–3 architects before choosing — personal fit matters for a project that may last months.
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