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Architect Contracts UK: Terms of Engagement Guide

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Written by Brad Askew Solicitor (non-practising)
Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice.
Updated June 2026 · England & Wales
If you are hiring an architect for a building project, whether that is an extension, a new build, or a commercial development, the paperwork that sits behind the working relationship matters as much as the drawings themselves. A written agreement sets out what the architect will do, what the client will pay, who owns the plans, and what happens when something goes wrong. Getting this right at the start saves arguments later, when budgets are tight and deadlines are slipping. This page walks through the three main types of document that commonly appear between architects and their clients in England and Wales, what they typically contain, and the practical points worth thinking about before you sign anything. It is written for clients instructing an architect, and for architects who want a plain-English view of how these arrangements usually fit together.

What this document is

An architect's contract is the written agreement that governs the relationship between an architect and the person or business instructing them. In practice, you will usually see this called the terms of engagement, sometimes alongside a separate project-specific agreement and a licence covering the use of the drawings.

Architects registered with the Architects Registration Board are bound by a professional code, and most will also be members of a professional body such as RIBA, which publishes standard forms of appointment that are widely used in the industry. The written contract typically covers the scope of work, stage-by-stage deliverables, fees and payment terms, responsibilities on both sides, intellectual property in the designs, insurance, liability limits, and how disputes are handled.

For residential clients, consumer cancellation rules can also apply to contracts signed away from the architect's office. The document can be short for a small job or run to many pages for a complex build, but the purpose is the same: to make each party's obligations clear before work starts.

How to use this document

  1. Check the architect is registered. Only someone on the ARB register can legally call themselves an architect in the UK. Before you sign anything, confirm registration and ask whether the practice also holds RIBA chartered status. This is a basic but important step, because it tells you the person is subject to professional standards and a complaints route if things go wrong.
  2. Agree the scope in writing. Be specific about what the architect will and will not do. Will they handle planning applications, building regulations drawings, tender documents, and site visits during construction, or only some of these? Scope creep is a common source of friction, so list the stages you want covered and note anything that is excluded, such as structural engineering or party wall matters.
  3. Pin down the fee structure. Architects charge in different ways: a fixed lump sum, an hourly rate, a percentage of construction cost, or a mix. Ask for a written breakdown, including what triggers additional fees, how expenses are handled, and when invoices are raised. If the project changes mid-way, the contract should explain how extra work is priced and approved.
  4. Clarify ownership and use of the drawings. Copyright in the plans usually stays with the architect, and you are given a licence to use them for the agreed project. Read this carefully if you think you might reuse the design, build a second property from the same plans, or part company with the architect before construction starts. The licence terms determine what you can lawfully do with the drawings.
  5. Look at liability, insurance and termination. The contract should confirm the architect carries professional indemnity insurance, often with a stated minimum level of cover. It will usually cap their liability and set a time limit for claims. Check how either side can end the agreement, what notice is required, and what fees are payable if the project is paused or cancelled partway through.

Common questions

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Common questions

Q Do I really need a written contract with my architect?
A written agreement is strongly recommended, even for small projects. It records what you have agreed on scope, fees, timescales and ownership of the drawings, which avoids disputes later if memories differ. Professional codes expect architects to set out terms in writing before starting work, and most reputable practices will insist on it. A verbal arrangement is legally possible but much harder to enforce if something goes wrong.
Q What is the difference between an architect and an architectural designer?
The title 'architect' is protected in UK law. Only someone registered with the Architects Registration Board can use it. An architectural designer or technologist may be highly skilled and produce excellent drawings, but they are not bound by the same regulatory framework and cannot call themselves an architect. This matters for professional indemnity insurance, complaints procedures, and certain planning or tender processes where chartered status is expected.
Q Who owns the copyright in the architect's drawings?
Copyright usually stays with the architect as the creator of the work, and the client is granted a licence to use the drawings for the agreed project. The licence may be conditional on fees being paid in full. If you want broader rights, for example to reuse the design on another site, this needs to be negotiated and written into the contract. Always read the intellectual property clause carefully before signing.
Q How are architect's fees normally calculated?
There are several common approaches: a fixed fee for a defined scope, an hourly or daily rate, a percentage of the final construction cost, or a combination. Larger and more complex projects tend to use percentage fees, while smaller jobs are often quoted as lump sums. Ask for the basis to be set out in writing, along with how variations and additional work are priced if the project changes.
Q Can I end the contract if I am not happy with the architect?
Most agreements include a termination clause allowing either side to end the relationship, usually with written notice. You will generally owe fees for work already done and possibly a notice period payment. If you believe the architect has fallen short of professional standards, you can also raise a complaint with their practice, and ultimately with the ARB or RIBA. Check the dispute resolution clause in your contract.
Q Does my architect need professional indemnity insurance?
Registered architects are required to hold professional indemnity insurance as a condition of practice. The contract should state that cover is in place and often specifies a minimum level. This insurance is what you would claim against if the architect's negligence caused you loss, for example through a defective design. Ask to see confirmation of cover if it is not already referenced in the terms of engagement.
Q What happens if my project goes over budget?
The contract should explain how cost overruns are handled, particularly if fees are tied to construction value. Some agreements include bonus or contingency arrangements, while others leave overruns as a matter between the client and the building contractor. The architect's role is usually to design and, where instructed, monitor construction, but they are not normally guarantors of the final build cost unless they have agreed to that in writing.
If you're dealing with this kind of situation, speak to an experienced legal adviser who can walk you through it — from £89.

Sources

This guide is based on primary UK law and official guidance.

Brad Askew, Solicitor (non-practising)

Written & reviewed by

Brad Askew Solicitor (non-practising)

Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice. LegalDocuments.co.uk is not a law firm and does not provide regulated legal advice.

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Legal disclaimer
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.