How much do architect fees cost in the UK?

Traditional architects charge 8–15% of the build cost. For a £60,000 extension, expect £4,800–£9,000. Fixed-price services like PlanBuildCo charge £250–£2,200 depending on what you need.

Do I need an architect for an extension?

No. An architect is one option, but architectural technologists and fixed-price design services produce the same planning and Building Regulations drawings for less. An architect adds value when you want a bespoke design concept.

What is the difference between an architect and a designer?

'Architect' is a legally protected title — only RIBA/ARB registered professionals can use it. Architectural designers and technologists are qualified professionals who can produce planning and Building Regulations drawings but cannot call themselves architects.

Architect Fees UK: What You Should Actually Pay in 2026

Architect fees are one of the most confusing costs in a home extension project. Traditional architects charge 8–15% of the build cost, but there are cheaper routes that deliver professional results. This guide explains all the options.

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Cost breakdown

Traditional architect fees

A RIBA-chartered architect typically charges 8–15% of the build cost for a full service (concept through to completion). For a £60,000 extension, that is £4,800–£9,000. This covers concept design, planning drawings, Building Regulations, tender documentation, and site visits during construction.

Architectural technologist fees

Architectural technologists (not architects, but qualified designers) typically charge 5–10% or fixed fees. They specialise in the technical side — planning drawings, Building Regulations, structural coordination. Many homeowners find this is all they need.

Fixed-price design services

Services like PlanBuildCo charge fixed fees for specific deliverables. Design discovery: £250. 3D laser scan: £650. Structural calculations: £350. Planning application: £2,200. Building Regulations: £399. You know the cost before you start, and you only buy what you need.

What to look for

Choose based on what you need. If you want a bespoke architectural vision and can afford 8–15%, hire an architect. If you want professional plans at a predictable cost, a fixed-price service delivers the same technical output for a fraction of the fee.

Service	Fee Structure	Typical Cost (£60k build)
RIBA architect (full service)	8–15% of build	£4,800–£9,000
Architectural technologist	5–10% or fixed	£3,000–£6,000
PlanBuildCo (design to planning)	Fixed price	£250–£2,200
Online plan drawing service	Fixed price	£500–£2,000
Self-drawn plans	Your time	£0 (but risks)

Prices based on Dorset rates, 2026

Frequently asked questions

Local cost guides

Poole Bournemouth New Forest Salisbury Dorchester

Related cost guides

Structural Engineer Cost for Extensions 2026 Planning Application Cost & Fees 2026 How Much Does a Single Storey Extension Cost in 2026?

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