Guide to Accounting for Architects: Solid Finance Foundations

Architecture is a creative profession run as a business, and the two don’t always sit comfortably together. You trained to design buildings, not to track work in progress across a dozen live projects or work out when a stage payment becomes taxable income.

Yet the financial side of a practice has quirks that a general guide to small business accounting simply misses. Fees arrive in stages months apart. A single commission can run for years. Professional indemnity cover is a regulatory requirement, not an optional extra.

This guide looks at accounting for architects as it works in practice: how project and stage-based fees affect your numbers, the tax and reliefs that matter most to design practices, and when bringing in specialist support starts to pay for itself.

Your architecture practice is not a typical business

Most accounting advice assumes you sell a product or bill for time in a fairly steady stream. An architecture practice does neither. Three features set your finances apart from almost any other small business.

• Long projects. A commission can span months or years from first sketch to handover, so income and effort rarely fall in the same accounting period.
• Staged fees. You’re usually paid in instalments tied to project milestones, not on completion, which makes revenue lumpy and timing critical.
• Mandatory professional cover. Registered architects must hold professional indemnity insurance, a significant fixed cost that most trades never face.

Get the accounting right for these three and the rest of running the practice becomes far easier to plan around.

Billing and revenue across the RIBA work stages

Most practices structure fees around the RIBA Plan of Work, the framework that breaks a project into stages from strategic definition and concept design through to technical design, construction and handover. Fees are typically agreed as a percentage of construction cost, a fixed lump sum or an hourly rate, and then profiled across those stages.

Fees are usually front-loaded toward the earlier design stages, where much of the value is created. A common split bills around 35% of the fee across the early design and planning stages, a further 35% at technical design, and the remaining 30% through construction and handover, though every appointment differs.

This staging matters for your accounts because invoicing and earning aren’t the same thing. If you bill a stage in advance, that money isn’t all profit the moment it lands. If you’re mid-stage at your year end, you’ve earned fee income you haven’t yet invoiced. Both situations need handling properly, which brings us to work in progress.

Work in progress and unbilled time

Work in progress is the value of work you’ve done but not yet billed. On long architectural projects it can be substantial, and it’s easy to overlook because no invoice has been raised.

Ignore it and your accounts understate what the practice is worth and distort your profit from one year to the next. Tracking work in progress accurately gives you a truer picture of profitability and stops a quiet year on paper masking a busy one in reality. It’s one of the clearest reasons design practices benefit from proper management accounts rather than a once-a-year look at the books.

Project accounting and job costing

Because each commission has its own timeline, budget and team, the practices that stay profitable treat every project almost as a small business in its own right. That is the principle behind job costing: tracking income and cost at the level of the individual project, not just the practice as a whole.

Done well, job costing answers the questions that decide whether a practice grows or just stays busy:

• Which projects made money once staff time was accounted for, and which quietly lost it.
• Whether the fee you agreed still covers the hours the job is really taking.
• How much of each fee is eaten by sub-consultants, such as structural engineers or planning consultants, brought in on the project.
• Which project types and clients are worth pursuing more of.

Tracking staff time against projects is central to this, since people are a design practice’s biggest cost. It is also where the difference between turnover and profit becomes very real: a practice can be turning over healthy fees while individual jobs run at a loss, and only job-level costing reveals it.

Disbursements are worth a separate mention. Costs you incur on a client’s behalf, such as planning application fees paid to the local authority, are normally recharged at net cost and should be kept distinct from your own fee income, both for clean billing and for correct VAT treatment.

Managing your cash flow between milestones

Staged fees create a particular cash flow problem. Your costs, mostly salaries, rent and software, fall every month. Your income arrives in lumps whenever a project milestone is reached.

The gap between the two is where practices get caught out.

A practice can be profitable on paper and still struggle to make payroll if three big projects all happen to be between billing stages at once. The risk grows as you take on larger commissions, because the gaps between payments get longer.

Short-term cash flow forecasting is the answer: mapping expected fee instalments against your fixed monthly outgoings so you can see a squeeze coming and plan around it, rather than discovering it the week wages are due. 

This is exactly the kind of forward view that management accounts and finance director input are built to give.

Which taxes and reliefs matter most to your practice?

A few areas of tax deserve particular attention in an architecture practice, because the reliefs and rules either bite harder or apply more often than they do elsewhere.

R&D tax relief on genuine design innovation

Architectural projects that involve resolving real technical uncertainty, such as novel structural solutions, new materials or complex engineering challenges that couldn’t be solved using existing knowledge, may qualify for research and development tax relief. Routine design work and purely aesthetic choices don’t qualify, and the test is genuinely about technical advance, not creativity alone.

The rules changed significantly for accounting periods beginning on or after 1 April 2024. The old separate SME and large-company schemes were replaced by a single merged scheme giving a 20% expenditure credit, worth roughly 15% of qualifying spend after corporation tax, with enhanced support reserved for loss-making, R&D-intensive companies.

Many older guides still quote the more generous pre-2024 SME rates, so it’s worth taking current advice before assuming a particular figure. Claims also now face much closer HMRC scrutiny, so the work must be genuinely qualifying and properly documented.

Allowable expenses specific to practices

Beyond the usual allowable expenses, a few costs are particular to architects and easy to forget to claim:

• Design and CAD software subscriptions, often a sizeable annual cost.
• ARB registration fees and RIBA membership subscriptions.
• Professional indemnity insurance premiums.
• Continuing professional development, the training architects are required to keep up.
• Specialist equipment, from large-format printing to surveying kit.

Professional indemnity insurance

This is part regulation, part cost, and it belongs in any honest look at a practice’s finances. Under the ARB Code of Conduct, a new version of which took effect in September 2025, registered architects are expected to hold professional indemnity cover of at least £250,000 for each and every claim on a civil liability basis. The expected minimum steps up with fee income, commonly to £500,000 and then £1 million as a practice grows.

For budgeting, premiums often run in the region of half a percent to three percent of fee income, so it’s a real line in your costs and one that rises as the practice does. It is a genuine fixed overhead to factor into both your pricing and your cash flow planning.

VAT and structure, in brief

Two general points that apply to any growing business, kept short here. You must register for VAT once your taxable turnover exceeds £90,000 on a rolling 12-month basis, a threshold that catches practices as they scale. And the choice between sole trader, partnership and limited company affects your tax and liability as fees grow. We cover the sole trader versus limited company decision in detail separately, and it’s worth taking advice on the right point to make the change.

Growing your team

As a practice takes on architectural assistants, Part 2s and support staff, payroll, pension auto-enrolment and Real Time Information reporting to HMRC all come into play. Many practices also work with freelance and sub-consultant architects, which raises its own questions about employment status and how those costs are treated. 

Our guide to statutory payments covers the employer basics. The key point for a design practice is that staff are both your largest cost and the resource you bill against, so getting payroll and time tracking joined up matters more here than in most businesses.

Is it time your practice brought in an accountant?

Plenty of small practices manage their own books in the early days, and that’s fine while projects are few and fees are simple. The case for specialist accountants for architects strengthens as soon as the practice starts to scale. 

The signs are usually clear:

• You’re running several projects at once and can no longer see at a glance which ones are profitable.
• Cash flow feels tight even though the practice is winning work.
• You’re taking on staff and the payroll and pension admin is eating your design time.
• You suspect you’re leaving R&D relief or allowable expenses unclaimed.
• You’re weighing up a change of structure as fees grow.

A specialist understands the rhythm of a design practice, the staged fees, the work in progress, the project-level profitability, and can build reporting around how you really work rather than forcing your numbers into a generic template.

Build your architectural practice on solid foundations

The design work is what clients see, but the financial structure underneath decides whether a practice grows steadily or lurches from one cash squeeze to the next. Understanding your project profitability, planning around staged fees and claiming the reliefs open to you turns the numbers from a year-end chore into a tool you can steer the practice with.

If you would like help getting the financial side of your practice in order, please get in touch. Whittock Consulting provides accountancy and outsourced finance director support for growing businesses, from management accounts and project reporting through to cash flow planning and profitability reviews. We’d love to hear from you.