How Much Do Architects Charge in the UK?
Architect fees for residential projects in the UK are usually quoted either as a percentage of the build cost (typically 5–15%), a fixed fee, or an hourly rate (£60–£150 per hour for most residential architects). The scope of service — whether it covers just planning drawings or the full process from concept to completion — has a dramatic effect on the total fee.
Typical Cost (UK, 2026)
All costs are indicative estimates. Obtain at least 3 quotes from qualified builders. Prices exclude VAT (20%).
Factors Affecting the Cost
Scope of service
Planning drawings only (Stage 1–2) is the cheapest option. Full architectural services (concept through to construction and site inspections) costs significantly more.
Project size and complexity
A small rear extension needs far fewer drawings and less design time than a complex new build or listed building project.
Architect seniority and location
A sole practitioner in the North of England will charge less than a London-based practice. RIBA-chartered architects typically charge more than architectural technologists.
Number of revisions
Agreeing a clear brief at the start reduces the number of costly design iterations. Watch for fees that escalate with unlimited revisions.
Cost Breakdown
| Item | Basic | Mid-range | High-end |
|---|---|---|---|
| Feasibility and concept design (Stage 0–1) | £500 | £1,500 | £4,000 |
| Planning drawings only (Stage 2–3) | £1,500 | £3,500 | £7,000 |
| Building regulations drawings (Stage 4) | £1,000 | £2,500 | £5,000 |
| Tender and contractor procurement (Stage 5) | £500 | £1,500 | £3,500 |
| Site inspections (Stage 5–6) | £1,000 | £2,500 | £6,000 |
| Full service for extension (all stages) | £5,000 | £10,000 | £18,000 |
Costs are indicative and exclude VAT. Regional variations apply.
Typical Timeline
Concept to planning submission: 4–8 weeks; full service for extension: 6–18 months
Frequently Asked Questions
Get a Personalised Cost Estimate
Use our interactive calculator to estimate your extension cost by size, type, and location.
Calculate Your Extension Cost →