UK architecture: Foster + Partners out-earns the rest of the market combined

About 103 UK architecture companies publish a full profit-and-loss, booking £3.0bn of combined turnover between them — and one of them is most of the story. Foster + Partners turned £571M of fees into £108.7M of pre-tax profit, paid a £100M dividend, and grew revenue 55% in a single year. The other ninety-odd companies on the map netted roughly £103M between them — a third of that from a mis-coded engineering arm. Meanwhile Zaha Hadid — arguably the second most famous name in the table — kept just £342k of its £83M of billings. British architecture’s brands are global; its profits are extraordinarily concentrated, and margin tracks the signature on the drawings, not the size of the studio. Figures are approximate — verify against a company’s own accounts before relying on any single number.

The Ltd slice of a partnership profession

Two honesty notes before any ranking, because this map has unusual edges.

First, much of British architecture doesn’t appear here at all. A large share of the profession practises as LLPs and partnerships — Sheppard Robson, Allies and Morrison, Grimshaw and Hawkins\Brown among the best known — and those structures sit outside this map of limited companies. Sometimes the LLP leaves a shadow: T P Bennett Services is the 334-person staffing company that serves the TP Bennett partnership, booking £21.0M at a deliberately thin 4.8% — cost-recovery economics, not a practice competing for work. Read every count and total below as a floor, and the concentration figures as “of the visible corporate slice”.

Second, not everything classed as architecture is architecture. Three of the twelve biggest entities in the category are really engineering or procurement businesses: Worley Europe (£400M, the Australian energy-engineering group’s European arm), Burns & McDonnell Europe (UK) (£42M, a US engineering firm building a UK operation at a heavy loss) and Perfect Circle JV (£102.6M of public-sector framework commissions flowing through a company with four employees). Together that’s roughly £545M of the £3.0bn that belongs in our engineering services map, not here. Strip it out and the pure-architecture market is about £2.4bn — of which Foster + Partners alone is roughly a quarter.

The giants

The Foster + Partners year deserves its own paragraph, because the numbers are extreme even for the firm that designed the Gherkin and Apple Park. Revenue rose 55% to £571M in the year to April 2025, headcount rose 19% to 1,930 — so the growth is staffed, not just billed — profit came in at £108.7M — though £20.7M of that was dividend income from its own subsidiaries rather than fees, so the trading profit was £87.9M, a 15% margin at £300k of revenue per head — cash climbed from £39M to £190M, and £100M went out the door as a dividend into a structure backed by the Canadian investor Hennick & Company. Overseas mega-projects are doing the lifting. Whatever one thinks of the model, no other British practice is within an order of magnitude of it: strip out the engineering strays — only two of which actually lose money — and the rest of the map still nets only about £104M combined, less than Foster’s headline profit.

The second-clearest story in the table is Populous, the stadium and arena specialist behind Wembley and the Las Vegas Sphere: revenue up 21% to £163.6M, headcount up 51% to 436, and £19.4M of profit at a 12% margin. The global venue boom is paying its architects.

Then comes the pattern that defines the rest of the top table: famous names, thin entities. Zaha Hadid makes 0.4% on £83M. Gensler Europe makes 1.9%; Perkins + Will UK 4.0%; HKS Architects, another US-parented name, lost £2.4M on £11.4M. AHMM — employee-owned, and the practice behind Television Centre — made 1.2% while cutting staff 12%. BDP, owned by Japan’s Nippon Koei, saw revenue fall 13% and profit drop by nearly two-thirds to £3.7M. Benoy recovered from a £2.3M loss to barely-positive. For the international firms in particular, the UK entity’s margin is a group accounting outcome as much as a trading one — where the profit of a global practice lands is a question the local accounts can’t settle — so compare these thin percentages with the independents’ cautiously. And Dar Al-Handasah (UK), part of the Sidara group, runs 1,194 staff at a persistent loss while its sister company Dar Al-Handasah Consultants (Shair & Partners) makes 16% on £15M — the same group, split across entities with opposite P&L shapes.

The signature tier: where 18–20% margins live

Below the giants sits the most distinctive feature of this market: a band of independent, name-brand studios earning professional-services margins that most consultancies would envy. These are the practices whose founders’ names are the product — and the margin follows the name.

*McAslan’s 18.3% is real but its £21.5M of turnover sits on just 48 staff — about £450k per head, three or four times a normal studio — so a large share of the billings passes straight through to sub-consultants on big delivery jobs. Its 108% revenue jump is project billing, not a practice doubling in size. Don’t compare its ratios with a fee-for-service studio’s.

A further eight practices qualify at 4–9% — Heatherwick Studio (9.0%) and the aviation specialist Pascall + Watson (7.9%) the biggest of them. The pattern across the tier: specialism is margin. Bridges, five-star resorts, museums, stations and stadiums pay 12–20%; general commercial work pays mid-single digits. The dividends confirm these are genuine profit machines, not accounting artefacts — Wilkinson Eyre paid out £6.0M and EPR £7.1M in their latest years, each more than a year’s profit. And note what the money is buying: the highest margin on the whole table belongs not to an architect but to Boundary Visualisation, the CGI studio that renders other people’s buildings — 19.8%, 63 staff, growing 51% a year. Selling images of architecture is currently a better business than most architecture.

The shape of the market

The visible market effectively starts at £5M — smaller practices publish little — and its mid-market is startlingly healthy: the £25–100M band is 95% profitable, the strongest band we’ve mapped in any industry. The graveyard is the small end, where only 29% of the sub-£1M companies make money.

Growth, read with care

*See the footnote above — McAslan’s jump is pass-through-heavy project billing.

The genuine article here is the hiring-backed profitable grower: WATG (+50% revenue, +29% staff, 19% margin — the resort-design boom), Bryden Wood (+32%/+35%, selling design-for-manufacture into data centres and infrastructure) and Boundary Visualisation (+51%/+26%). Foster’s +55% with 19% more staff belongs in the same category, at ten times the scale. On the other side: Burns & McDonnell grew 46% in calendar 2024 while losing £37.8M — a US engineering giant buying its way into the UK market, with negative net assets of £63M funded by its parent (a fresher filing has just reached the register, so treat this row as the 2024 picture) — and Thornton Tomasetti is structural engineering rather than architecture. Karakusevic Carson, the council-housing specialist, grew revenue 36% while cutting staff 27% — a book-of-work spike, not an expansion.

Structure and vintage: an old profession with no new companies

The top five entities hold 47% of visible turnover and the top ten 59% — but the head of the curve mixes Foster with the engineering strays, so the honest reading is simpler: one practice is about a quarter of the pure-architecture market, and no one else is above 7%.

The vintage profile is old and getting older: 29 of the 103 predate 1990, the cohorts shrink decade by decade, and not a single company incorporated since 2021 appears — new practices start small, stay below the reporting radar for years, and increasingly start as LLPs anyway. Ownership splits 51 corporate / 41 individual, and about 15 carry Holdings/Group-style names — the consolidators are here, with Corstorphine & Wright (13 subsidiaries, 283 staff, 11% margin) the clearest acquisitive roll-up in the visible market.

What the map shows

1. Foster + Partners out-earns the rest of British architecture combined. £108.7M of pre-tax profit (£87.9M of it trading profit, the rest dividends from its own subsidiaries) against roughly £103M net for everyone else on the map — about £104M excluding the engineering strays — plus a £100M dividend and 55% staffed growth.
2. The signature is the margin. Name-brand specialist studios — Wilkinson Eyre, WATG, Hopkins, EPR, McAslan — earn 16–20%; famous names operating as delivery arms of global groups (Zaha Hadid, Gensler, Perkins + Will, HKS) book 0–4% in their UK entities, where the local margin is partly a group accounting outcome.
3. The mid-market almost never loses money. 95% of the £25–100M firms are profitable — the strongest band we’ve mapped in any industry.
4. Venues are the boom. Populous grew 21% with staff up 51% on stadiums and arenas; WATG grew 50% on resorts; Foster’s growth is overseas mega-projects.
5. A chunk of “architecture” is engineering. Worley Europe, Burns & McDonnell and the four-person Perfect Circle conduit put ~£545M of engineering and framework turnover in this category — see our engineering services map.
6. This is the Ltd slice of a partnership profession. Sheppard Robson, Allies and Morrison, Grimshaw, Hawkins\Brown and TP Bennett practise through structures outside this map — every total here is a floor.

Methodology and caveats

This covers only the 103 UK architecture companies that publish a full profit-and-loss; the profession’s long tail of small studios publishes no figures, and its many LLPs and partnerships sit outside the map entirely, so counts and totals are floors. Some practices appear at more than one level of their group structure — EPR appears as EPR Architects, EPR Architects Group and EPR Group, one practice counted more than once in the combined totals, and the two Dar Al-Handasah entities are siblings in one group — while several of the largest entities in the category are engineering businesses rather than architects, which we flag rather than silently drop. Entities with heavy pass-through billing (McAslan, Perfect Circle) have ratios that aren’t comparable to fee-for-service studios; UK arms of international groups carry margins shaped by group structure; large one-off swings may be project timing rather than trading. Figures are approximate and specialism labels are directional — verify any specific figure against the company’s own accounts. This is analysis, not financial advice.