The top 25 UK architecture firms, 2026
The UK's biggest architecture and design practices ranked by the turnover in their own filed Companies House accounts — not survey returns. The famous names that don't disclose revenue are named rather than guessed at, and practices that consolidate global work through their UK filings are footnoted as such.
What the filings show
British architecture is Foster + Partners and everyone else: £571M (up 55% on a year of Middle East megaprojects) against £1.30B for the other 30 practices combined. No other list in this franchise has a leader this dominant — and its filing consolidates the practice's global work, which the footnote says plainly.
Below the outlier, the profession is specialist and lean: stadium architects (Populous, +21%), heritage (Purcell), aviation (Pascall + Watson), hospitality (WATG), residential (HTA, PRP) — 7 tagged specialisms in all. Fees per head run £80–150k and the famous studios are smaller businesses than their reputations suggest: Zaha Hadid at £83M, Heatherwick at £37M.
The growth table — Foster + Partners (+55%), WATG UK (+50%), Bryden Wood (+32%), Scott Brownrigg (+31%) — tracks where the work is: international sport, infrastructure and the Gulf. The honest gap: several of Britain's most celebrated practices simply don't disclose revenue (small-companies regime), so Make, Sheppard Robson and Hawkins\Brown sit in the can't-rank list — a survey would guess; filings don't let us.
Top 25 architecture firms in the UK by filed turnover
Latest accounts filed as of June 2026 · refreshed monthly
| # | Firm | Turnover | YoY | Staff | Accounts |
|---|---|---|---|---|---|
| 01 | Foster + Partners International architecture and design practice The global practice’s consolidated filing — over three times the size of any other UK architect. | £571M | +55% | 1,930 | FY to Apr 2025 |
| 02 | Populous architecture (sport & venues) Sports architecture and design firm The EMEA business of the stadium specialist. | £164M | +21% | 436 | FY to Dec 2024 |
| 03 | BDP multidisciplinary design Architecture and engineering firm Building Design Partnership — owned by Japan’s Nippon Koei. | £130M | -13% | 1,234 | FY to Jun 2025 |
| 04 | Dar Al-Handasah UK multidisciplinary design Architectural consultancy subsidiary UK design office of the Dar Group (which also owns Perkins&Will and Currie & Brown). | £127M | +22% | 1,194 | FY to Dec 2024 |
| 05 | Zaha Hadid Employee-owned architectural practice Zaha Hadid Limited, consolidated. | £83M | +8% | 503 | FY to Apr 2025 |
| 06 | Gensler Europe European architectural and design practice UK-registered European business of the world’s largest architecture firm. | £75M | +2% | 313 | FY to Mar 2025 |
| 07 | TP Bennett Architectural, design and planning practice TP Bennett LLP, consolidated. | £48M | +11% | 334 | FY to Mar 2025 |
| 08 | AHMM Employee-owned architecture practice Allford Hall Monaghan Morris — employee-owned. | £46M | -3% | 407 | FY to Mar 2025 |
| 09 | Benoy architecture (retail & masterplanning) Architecture and urban planning practice | £43M | +8% | 433 | FY to Dec 2024 |
| 10 | Allies and Morrison Architecture and urban planning practice Allies and Morrison LLP. | £37M | -17% | 286 | FY to Mar 2025 |
| 11 | Heatherwick Studio design studio Architecture and design studio | £37M | -13% | 221 | FY to Mar 2025 |
| 12 | Ryder Architecture Architectural practice | £36M | +14% | 330 | FY to Apr 2025 |
| 13 | Pascall + Watson architecture (aviation) International architectural and engineering firm | £35M | +7% | 245 | FY to Dec 2025 |
| 14 | Hopkins Architects Employee-owned architectural practice | £35M | -1% | 165 | FY to Mar 2025 |
| 15 | WATG UK architecture (hospitality) UK arm of WATG architects Wimberly Allison Tong & Goo’s UK company. | £34M | +50% | 167 | FY to Dec 2024 |
| 16 | Bryden Wood design & technology Architectural and engineering practice | £31M | +32% | 226 | FY to Mar 2025 |
| 17 | Purcell architecture (heritage) Employee-owned architectural design practice Purcell Architecture Limited. | £30M | +14% | 323 | FY to Apr 2025 |
| 18 | Corstorphine & Wright Architectural services firm | £29M | +14% | 283 | FY to Jun 2024 |
| 19 | BIG Partners UK arm of Bjarke Ingels Group Bjarke Ingels Group’s London company. | £28M | -17% | 162 | FY to Dec 2024 |
| 20 | Scott Brownrigg Architectural design practice | £28M | +31% | 168 | FY to Jan 2025 |
| 21 | Stride Treglown Employee-owned architectural group Stride Treglown Group plc, consolidated — employee-owned. | £27M | -11% | 333 | FY to Dec 2024 |
| 22 | KPF London US-headquartered architectural practice Kohn Pedersen Fox’s UK registration of its international practice. | £27M | -5% | 127 | FY to Dec 2025 |
| 23 | RSHP International architectural practice Rogers Stirk Harbour + Partners’ group company. | £27M | — | 173 | FY to Dec 2024 |
| 24 | Broadway Malyan Architectural and urban design practice | £23M | +22% | 99 | FY to Apr 2025 |
| 25 | EPR Architects Architectural and interior design practice | £22M | +9% | 164 | FY to Mar 2025 |
The next 6
Firms ranked 26–31
| 26 | Grimshaw | £20M | +15% | FY to Sept 2025 |
| 27 | HTA Design architecture (residential) | £19M | -4% | FY to Mar 2025 |
| 28 | PLP Architecture | £17M | +5% | FY to Dec 2024 |
| 29 | HOK London | £16M | -8% | FY to Dec 2024 |
| 30 | PRP architecture (residential) | £15M | +6% | FY to Mar 2025 |
| 31 | Feilden Clegg Bradley | £13M | -12% | FY to Mar 2025 |
The firms we can't rank
Architecture's missing names are small-companies-regime filers — famous practices, financially invisible.
- Make Architects — employee-owned practice files without disclosed turnover in scope
- Sheppard Robson — main practice entity files under the small-companies regime
- Hawkins\Brown — files under the small-companies regime (no turnover disclosed)
- Squire & Partners, WilkinsonEyre, Fletcher Priest — no filings with disclosed turnover in scope
- Chapman Taylor — files without disclosed turnover
- Atkins/AECOM/Stantec architecture teams — consolidated inside engineering groups ranked in our engineering list
How this list is built
Source. The latest annual accounts each firm filed at Companies House. Where a firm files consolidated group accounts, the group figure is used; the entity ranked is named under each firm. Where a firm filed a transition period longer or shorter than twelve months (flagged in the Accounts column), the table shows the filed figure but the firm is ranked on its annualised equivalent.
Who counts as an architecture firm. Architecture and design practices, tagged by specialism. Engineering consultancies (our engineering list), framework JV vehicles and design teams consolidated inside engineering groups are excluded.
Scope. UK-registered filings. UK-headquartered global practices (Foster + Partners, Zaha Hadid) consolidate international work in their filings — footnoted; US-headquartered firms (Gensler, HOK, KPF, BIG) appear through their UK companies only. This is the most LLP-heavy list in the franchise: five of the ranked practices carry no SIC code at all and would be invisible to a category search.
Cadence. Rebuilt monthly as new accounts land. Spot a practice we've missed or misread? Tell us — the methodology only works if it's challenged.
Quick answers
- What is the biggest architecture firm in the UK?
- Foster + Partners, and it isn't close: £571M in its latest filed accounts — more than three times the next practice, and not far off the rest of the top 25 combined (£1.30B across 30 firms).
- Why are famous practices missing?
- Architecture is small-business Britain at its most extreme: celebrated practices like Make, Sheppard Robson and Hawkins\Brown file under the small-companies regime with no turnover disclosed, so no honest list can rank them. They're named in the firms we can't rank.
- Do these figures include international work?
- Where a practice consolidates globally through its UK filing — Foster + Partners, Zaha Hadid, Populous's EMEA arm — yes, and the notes say so. The US giants (Gensler, HOK, KPF, BIG) appear through their UK-registered companies only.
- Why is this list shorter than the others?
- Disclosure, not size: 25 ranked firms (plus 6 more below the line) is what filed accounts with turnover support in this profession. The RIBA top-100 surveys cover more firms — by asking them, not by auditing them.