How to Start an Architecture Business in the UK

Architecture is one of the few professions in the UK where the title itself is legally protected. You cannot call yourself an architect unless you are registered with the Architects Registration Board (ARB). But once you are, starting your own practice is a realistic and rewarding move.

This guide covers the practical steps to get your architecture business up and running — from registration and insurance to managing your finances properly.

Professional Registration

Before anything else, you must be registered with the Architects Registration Board (ARB). This is a legal requirement under the Architects Act 1997. Registration costs around £117 per year and requires you to hold a recognised qualification (typically a Part 1, Part 2, and Part 3).

Most architects also choose to become members of the Royal Institute of British Architects (RIBA), which is optional but adds credibility and provides access to contracts, resources, and networking opportunities. RIBA chartered practice status requires at least one RIBA-chartered architect as a principal.

Sole Trader or Limited Company?

Many architects start as sole traders, particularly if they are working on smaller residential projects or offering freelance services to other practices.

As a sole trader, you register with HMRC for Self Assessment, pay Income Tax and National Insurance on your profits, and file a return each year. It is straightforward and keeps your costs low.

If your profits grow above £40,000–£50,000, or if you want to take on larger projects where liability is a concern, forming a limited company may be worth considering. A limited company provides a legal separation between you and the business, and can offer tax advantages through a salary-and-dividends structure.

Some architects form limited liability partnerships (LLPs) with other practitioners, which combines the flexibility of a partnership with limited liability protection.

Registering with HMRC

Register for Self Assessment with HMRC within three months of starting your practice. You will receive a UTR (Unique Taxpayer Reference) which you need for filing your tax return.

If your turnover is likely to exceed £90,000, you must register for VAT. Many architecture practices register voluntarily below this threshold because they can reclaim VAT on significant expenses like software, equipment, and materials.

Under the domestic reverse charge for construction services, some architecture services supplied to VAT-registered contractors may need to be accounted for under the reverse charge rules. Check whether your specific services fall within scope — pure design work is usually outside the reverse charge, but services connected to construction work may be caught.

Professional Indemnity Insurance

Professional indemnity insurance (PII) is essential for architects. ARB requires you to have adequate PII in place, and most clients and contractors will insist on seeing your certificate before appointing you.

The level of cover you need depends on the size of your projects. A minimum of £250,000 is typical for small residential work, but larger projects may require £1 million or more. Premiums vary widely but expect to pay £1,000–£3,000 per year as a sole practitioner.

You should also consider:

• Public liability insurance — especially if you visit construction sites
• Employers' liability insurance — legally required if you take on staff
• Cyber insurance — if you store client data and project files digitally

Claimable Expenses

Architecture practices can claim a wide range of business expenses:

• Software subscriptions — AutoCAD, Revit, SketchUp, Adobe Creative Suite, and similar tools
• ARB registration and RIBA membership fees
• Professional indemnity insurance premiums
• Home office costs — simplified flat rate or a proportion of actual costs
• Printing and plotting — large-format prints, model materials
• Travel to sites and client meetings — mileage at HMRC approved rates (45p per mile for the first 10,000 miles)
• CPD and training courses
• Marketing and website costs
• Equipment — computers, monitors, drawing tablets, cameras
• Subcontractor fees — structural engineers, planning consultants, etc.
• Reference books and technical publications

Keep every receipt. Using a tool like Accounted means you can photograph receipts on site and have them automatically matched to your bank transactions.

Industry-Specific Tax Considerations

Architecture has a few unique tax angles to be aware of:

Capital Allowances

High-specification computers and equipment qualify for Annual Investment Allowance (AIA). You can deduct the full cost of qualifying equipment up to £1 million in the year of purchase.

Flat Rate VAT

If you are VAT-registered, the flat rate for architecture is 14.5%. Run the numbers to see whether this saves you money compared to the standard scheme — it depends on how much VAT you reclaim on expenses.

Research and Development Relief

If your work involves innovative design solutions or developing new construction methods, you may qualify for R&D tax relief. This is more commonly available to limited companies but is worth investigating.

Construction Industry Scheme (CIS)

If you supply services to contractors who are registered under CIS, they may need to make CIS deductions from your payments. However, most pure architecture and design services are outside CIS scope. If your work includes project management or site supervision that falls within CIS, deductions may apply.

Setting Up Your Studio

You do not need an expensive office to start. Many architects work from home, using a spare room as a studio. If you need meeting space, consider a co-working membership or hire meeting rooms as needed.

Essential setup includes:

• A powerful computer capable of running BIM and rendering software
• A large monitor (or two)
• Reliable broadband — essential for cloud-based project management
• Cloud storage with proper backup — project files are your livelihood
• A professional website showcasing your portfolio

Winning Your First Projects

Building a pipeline of work is the biggest challenge for any new practice. Start with these approaches:

• Your existing network — former colleagues, university contacts, and friends are your best source of early referrals
• Small residential projects — extensions, loft conversions, and renovations are a reliable starting point
• Planning applications — many homeowners need an architect specifically for planning
• Online platforms — sites like Houzz and Bark connect architects with potential clients
• Local networking — estate agents, builders, and structural engineers can all refer work
• A strong portfolio website — good photography of completed projects is worth more than any advertising

Managing Project Finances

Architecture projects can span months or years. Managing your cash flow is critical:

• Fee proposals — be clear about your fees upfront. Percentage-based fees (typically 7–15% of construction cost) or fixed fees are both common.
• Stage payments — break your fees into stages aligned with RIBA work stages. Invoice at each stage completion.
• Late payment — architecture is notorious for slow payment. Set clear payment terms (14 or 30 days) and follow up promptly.
• Retainers — for ongoing client relationships, a monthly retainer can smooth your cash flow.

Bookkeeping Tips

Architecture projects involve multiple income streams, varied expenses, and long timelines. Good bookkeeping habits from day one will save you significant stress at tax time.

• Reconcile your bank account weekly
• Record expenses as they happen — do not let receipts pile up
• Track time against projects if you bill by the hour
• Keep project income and expenses clearly categorised
• Set aside 25–30% of your profits for tax

Accounted connects to your bank account and uses AI to categorise your transactions automatically. It is built for UK sole traders and handles everything from receipt capture to Self Assessment preparation.

Key Deadlines

• 31 January — Self Assessment tax return deadline
• 31 January and 31 July — payments on account
• Quarterly — VAT returns if registered
• Annually — ARB registration renewal, PII renewal, RIBA subscription

Getting Started

Starting an architecture practice takes careful planning, but the barriers are lower than many people think. Get your registration sorted, arrange proper insurance, and set up your finances correctly from day one.

Want to spend more time designing and less time on bookkeeping? Sign up for Accounted and let Penny handle the numbers while you focus on the work that matters.