Calculate Your Architect Fees
Frequently Asked Questions
How much do architects charge in the UK in 2026?
UK architect fees typically range from 7% to 17% of the build cost, depending on the project type and scope of services. A new build house averages 7–15%, an extension 10–17%, and a loft conversion 12–18%. For a £200,000 extension, expect architect fees of £20,000–£34,000 for full RIBA services.
What are the RIBA stages and how do they affect fees?
RIBA (Royal Institute of British Architects) organises architectural services into stages 0–7. Stages 0–2 cover preparation and brief; stages 3–4 cover design; stage 5 covers technical design; stages 6–7 cover construction and handover. If you only need design drawings without construction supervision, fees will be lower — typically 40–60% of the full-service fee.
Do architects charge a fixed fee or a percentage?
Architects use both methods. A percentage of build cost is common for larger or new-build projects and aligns the architect's fee with project complexity. A fixed fee is common for smaller, well-defined projects such as a single extension. Hourly rates (£60–£150/hour) are used for consultations or partial services.
Is VAT charged on architect fees?
Yes. Architect fees are subject to 20% VAT. This calculator shows fees excluding VAT. Always check whether quotes from architects include or exclude VAT, as this can significantly change the total cost.
Can I use a designer instead of a registered architect?
Architectural designers and technologists are not registered with the Architects Registration Board (ARB) and typically charge 20–40% less than a registered architect. They can produce planning drawings and technical specifications but cannot use the protected title 'architect'. For complex or high-value projects, using a registered RIBA architect is recommended.