Architect Fixed Fee Contracts: What To Include

Sarah runs a small architecture practice in Manchester. She wants to offer a fixed fee for concept design and planning drawings, because clients like certainty and it helps her quote faster.

The problem is that one client keeps asking for one more option, one more layout and one more planning tweak. The original fixed fee now feels more like an open-ended design subscription.

If that sounds familiar, you're not alone. Fixed-fee packages can work very well for architects, but only if your client terms clearly say what is included, what is excluded and when extra fees kick in.

A well-drafted architect fixed fee contract doesn't just protect you from awkward conversations. It helps your client understand the process, make decisions on time and budget properly for planning, consultants and changes.

What Is An Architect Fixed Fee Contract?

An architect fixed fee contract is an agreement where you charge a set amount for a defined scope of architectural services, rather than billing only by the hour or as a percentage of project cost.

In practice, your fixed fee might cover a specific package, such as:

• measured survey and feasibility advice
• concept design options
• planning drawings and supporting documents
• Building Regulations drawings
• tender information for contractors
• limited site visits during construction

The key word is defined. A fixed fee shouldn't mean you're taking on every possible design change, planning issue, client delay or consultant query for the same price.

Your agreement might be called an architecture services agreement, architect services agreement, architect terms and conditions, a client appointment letter or a fixed fee design contract. The label matters less than the content. It should make the deal clear enough that both sides know what they're signing up to.

Can You Offer Fixed Fees Without Taking On Unlimited Revisions?

Yes, you can offer fixed fees without taking on unlimited revisions, as long as your contract clearly limits what is included and explains how extra work will be charged.

This is where many fixed-fee packages fall down. The quote says something broad like concept design and planning drawings, but it doesn't say how many design rounds are included or what counts as a change.

A practical fixed-fee clause should cover:

• the number of included concepts, for example one initial concept and one revised concept
• the number of included revision rounds, for example up to two rounds of reasonable amendments
• what a revision means, such as adjustments to the agreed concept rather than a new design direction
• what happens after the included rounds are used, such as hourly rates or a further fixed quote
• client response times, so projects don't stay open indefinitely

For example, you might say that your fixed fee includes one initial design proposal and two rounds of client comments, provided those comments are consistent with the agreed brief. If the client later decides they want a basement, a different roof form or a new layout after planning drawings are complete, that should be treated as extra work.

That kind of scope creep clause can feel a little firm when you're trying to win a project. But in reality, it often improves the client relationship because the client knows when a decision has a cost attached.

How Should You Define Your Design Stages?

You should define your design stages by splitting your services into clear phases, with specific deliverables, assumptions and decision points for each phase.

Many UK architects use the RIBA Plan of Work as a helpful reference point, although your contract doesn't need to copy it word for word. What matters is that your own stages make sense for the way your practice works.

Common Fixed-Fee Stages

Your agreement could separate your services into stages such as:

• Initial consultation - discussing the site, client brief, budget and broad feasibility
• Survey and existing drawings - preparing or coordinating measured survey information
• Concept design - preparing initial layouts, massing, sketches or visual ideas
• Planning application stage - preparing planning drawings and relevant design documents
• Building Regulations stage - preparing technical drawings or coordinating technical input
• Tender or contractor information - helping the client request quotes from builders
• Construction support - site visits, answering contractor queries and checking progress, if included

For each stage, set out:

• what you'll prepare
• what you won't prepare
• what information the client must provide
• when the fee is payable
• what approvals or sign-offs are needed before the next stage begins

Stage sign-offs are especially useful. If a client approves the concept design and you then prepare planning drawings, your terms can say that later changes to the approved concept will be charged separately. This gives you a fair basis for saying, yes, we can do that, and here is the additional fee.

What Should Your Architect Terms And Conditions Include?

Your architect terms and conditions should include the commercial deal, the project process, your liability position, payment terms and the rules for changes, delays and termination.

At a minimum, your terms should cover:

• scope of services - what you're doing and the project stages included
• deliverables - drawings, reports, specifications, schedules or applications
• fees and payment dates - fixed fees, deposits, stage payments and VAT if applicable
• expenses - travel, printing, models, postage or specialist software costs
• third-party costs - planning fees, surveyors, engineers, planning consultants, subconsultants and other specialists
• client responsibilities - providing information, making decisions and paying third parties
• changes and extra work - when extra fees apply and how they're agreed
• intellectual property - who owns the drawings and what licence the client has to use them
• professional indemnity insurance - the level of cover you maintain and any liability cap
• programme - indicative timelines and what happens if the client or a third party causes delay
• termination - how either side can end the engagement and what fees remain payable

If you work with residential homeowner clients, the Consumer Rights Act 2015 also matters. Your terms need to be fair and transparent, and your services need to be carried out with reasonable care and skill. If you use cancellation rights, deposits or termination charges, these need careful drafting so they're not unfair.

If you work with business clients, your terms can usually be more commercial, but they still need to be clear. Under the Late Payment of Commercial Debts (Interest) Act 1998, you may be able to claim statutory interest at 8% above the Bank of England base rate, plus fixed compensation, for late B2B payments if your contract doesn't give you a substantial remedy. Many practices still prefer to spell out their own payment rules so there's no confusion.

How Do You Deal With Planning Permission Risk?

You should deal with planning permission risk by making it clear that you'll use reasonable care and skill, but you don't guarantee that the local planning authority will approve the application.

This is one of the biggest pressure points for fixed-fee architectural work. Clients often think they're paying for an outcome, when you're really providing professional services and advice within a planning system you don't control.

Your terms should say that planning outcomes may be affected by matters such as:

• local planning policy
• neighbour objections
• conservation area or listed building issues
• highways, drainage, ecology or tree constraints
• planning officer comments
• changes in the client's brief or budget
• information supplied by the client or other consultants

Local planning authorities generally aim to decide minor applications within 8 weeks, major applications within 13 weeks and applications needing an Environmental Impact Assessment within 16 weeks. Those timeframes can change in practice, especially if the authority asks for more information or if a planning performance agreement applies.

Your contract can also say what your fixed fee includes at planning stage. For example, you might include one planning submission and reasonable responses to straightforward planning officer comments, but exclude redesigns after refusal, appeals, resubmissions and specialist reports unless separately agreed.

Say you prepare a rear extension application for a homeowner in Bristol. The council then asks for a daylight and sunlight report and a revised roof design because of neighbour impact. If your terms exclude specialist consultant reports and treat material redesigns as extra work, you can explain the position calmly and quote for the extra stage.

When Can You Charge Extra Fees?

You can charge extra fees when the client asks for work outside the agreed scope, when assumptions change or when third-party requirements create additional work not included in the fixed fee.

Your services agreement should give clear triggers for extra fees. These triggers help avoid the awkward moment where the client says, but I thought that was included.

Common Extra Work Triggers

• new design options beyond the included number
• changes after a stage has been approved
• a major change to the brief, budget, site or proposed use
• extra meetings or site visits beyond the agreed allowance
• planning officer changes that require redesign
• appeals, resubmissions or amendments after a refusal
• work caused by inaccurate surveys or missing client information
• coordination with extra consultants not listed in the original scope
• contractor queries during construction if construction support isn't included
• urgent work requested outside the agreed programme

You can set extra fees in a few ways. Some practices use hourly rates. Others use a menu of fixed prices for common add-ons. You can also say that extra work will only begin once the client approves a written fee proposal.

Try to make this process easy for the client. A simple email saying, this sits outside the agreed planning package because it's a new design option, and the fee will be X if you'd like us to proceed, is often enough if your contract supports it.

What Third-Party Costs And Client Responsibilities Should You Spell Out?

You should spell out third-party costs and client responsibilities separately from your fixed fee, so the client doesn't assume every project cost is included in your price.

Architectural projects often involve other people, fees and decisions. If your proposal only shows your own fixed fee, the client may later feel surprised when planning fees, surveys or engineer input are needed.

Your terms should make it clear whether the following are included or excluded:

• local planning authority application fees
• Building Control fees or registered building control approver fees
• measured building surveys and topographical surveys
• structural engineer fees
• party wall surveyor fees
• planning consultant fees
• heritage, ecology, arboricultural, transport or flood risk reports
• CDM consultant or principal designer services, if not included in your appointment
• 3D visuals, physical models or marketing images
• printing, courier and large-format drawing costs

The Construction (Design and Management) Regulations 2015 may also be relevant, especially where there's more than one contractor. Your appointment should be clear about whether you're taking on any principal designer role, what that role covers and what information the client must provide.

For higher-risk buildings, the Building Safety Act 2022 and related Building Regulations changes can add extra dutyholder obligations and approval steps. If your practice doesn't work in that space, say so. If you do, your fixed-fee scope should be very specific about the building safety services included.

Who Owns The Drawings In An Architecture Services Agreement?

You usually own the copyright in your drawings unless you assign it, but your client will normally need a licence to use them for the agreed project.

Under UK copyright law, architectural drawings, plans and models can be protected works. Your terms should say whether you retain copyright and grant the client a licence to use the materials for the project at the site named in the agreement.

A sensible licence clause can cover:

• when the client can use the drawings
• whether the licence starts only once your fees are paid
• whether the client can share drawings with consultants, contractors or the council
• whether the client can use the drawings for another site or future project
• what happens if the client terminates before the project is complete

This isn't just about protecting your ideas. Without a clear licence, you may struggle if a client stops paying, gives your drawings to another designer or uses a concept beyond the project you priced.

Key Takeaways

• A fixed fee works best when the scope is tightly defined by stage, deliverables and assumptions.
• Your terms should limit revisions and explain when design changes become extra work.
• Planning permission should be treated as a risk you advise on, not an outcome you guarantee.
• Third-party costs, consultant fees and council fees should be clearly excluded unless you have priced them in.
• Stage sign-offs, payment milestones and copyright licences can prevent many common disputes.
• Templates can miss the practical details of how your practice actually works, so tailored terms are usually worth it.

If you'd like help with your architect client terms, fixed-fee scope clauses, planning risk wording or copyright licences for your drawings, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.