The UK construction industry powers the nation’s economy, contributing over £110 billion annually and employing millions. Whether you’re searching for the Top 100 Construction Companies in the UK, curious about the biggest construction firms in the UK, or wondering who is the biggest construction company in the UK, this is your go-to resource. At euroloo, we’ve crafted a data-driven guide to the Top 100 building companies in the UK for 2025, highlighting key players, financial performance, and industry trends.
Our rankings are based on the latest financial data from Companies House, enriched with insights from The Construction Index, Barbour ABI, and Glenigan. This ensures accuracy and relevance for contractors, suppliers, and industry enthusiasts seeking the list of the biggest construction companies in the UK.
Why This List Matters
The UK construction sector is navigating a complex landscape of rising costs, labour shortages, and sustainability demands. Our Top 100 Construction Firms in the UK list showcases companies leading in infrastructure, residential, commercial, and green projects. From megaprojects like HS2 to innovative modular housing, these firms are shaping the UK’s future.
Key Highlights for 2025
- Turnover Surge: The top 100 firms collectively reported £70.6 billion in turnover, up 4.8% from 2024.
- Profit Challenges: Margins are under pressure due to inflation and supply chain issues.
- Green Leadership: Firms like BAM Construct UK oraz Tarmac are driving sustainable practices.
- Regional Growth: Mid-tier companies shine in regions like the North West and Midlands.
The Top 100 Construction Companies in the UK 2025
Below is our definitive list of the Top 100 building companies in the UK, ranked by turnover based on the latest financial filings (2023/2024, cross-referenced with Barbour ABI oraz Glenigan for 2025 accuracy). We’ve included headquarters, notable projects, and website links for easy exploration.
| Rank | Company Name | Turnover (£bn) | Pre-Tax Profit (£m) | Headquarters | Notable Projects | Website |
|---|---|---|---|---|---|---|
| 1 | Balfour Beatty | 8.59 | 85 | Londyn | HS2, Gatwick North Terminal | balfourbeatty.com |
| 2 | Kier Group | 3.48 | 10 | Manchester | Hinkley Point C, Luton DART | kier.co.uk |
| 3 | Morgan Sindall | 2.97 | 80 | Londyn | Tideway Super Sewer, White Chapel Station | Morgan Sindall |
| 4 | Interserve | 2.55 | 15 | Berkshire | Heathrow Terminal 5, Leadenhall Building | interserve.com |
| 5 | Mace Group | 2.00 | 50 | Londyn | The Shard, Everton Stadium | macegroup.com |
| 6 | Laing O'Rourke | 1.80 | 45 | Dartford | Hinkley Point C, HS2 | laingorourke.com |
| 7 | Tarmac (CRH) | 1.70 | 60 | Solihull | M25, London 2012 Olympic Park | tarmac.com |
| 8 | Keller Group | 1.60 | 55 | Londyn | Global geotechnical projects | keller.com |
| 9 | Vinci Construction UK | 1.90 | 40 | Watford | Buckingham Palace restoration | vinci-construction.com |
| 10 | Galliford Try | 1.50 | 30 | Uxbridge | Highways, education projects | gallifordtry.co.uk |
| 11-100 | See full list below | – | – | – | – | – |
Due to space, ranks 11-100 are summarised. Download our free PDF for the complete list.
Top 5 Spotlight: Who Are the Biggest Construction Companies in the UK?
- Balfour Beatty: Leading with £8.59 billion in turnover, Balfour Beatty excels in infrastructure like HS2 and maintains 21,000km of UK roads. Their sustainability initiatives align with 2025’s green trends.
- Kier Group: With £3.48 billion, Kier shines in civils and public sector projects like Hinkley Point C, despite past financial hurdles.
- Morgan Sindall: Third at £2.97 billion, their portfolio spans rail, housing, and urban regeneration.
- Interserve: At £2.55 billion, Interserve thrives in multi-sector projects but faces profitability challenges.
- Mace Group: With £2 billion, Mace is renowned for iconic builds like The Shard and global consultancy.
Ranks 11-100: Key Players
- Skanska UK (#12, £1.45bn): Champions of sustainable infrastructure.
- Wates Group (#13, £1.45bn): Family-owned, strong in education and defence.
- Willmott Dixon (#15, £1.30bn): Leaders in fit-out and public sector projects.
- BAM Construct UK (#18, £1.20bn): Innovators in green building tech.
- Sir Robert McAlpine (#20, £1.10bn): Historic firm behind Wembley Stadium.
For the full list, including mid-tier stars like J. Murphy & Sons oraz Bowmer + Kirkland, download our free PDF tutaj.
2025 Industry Trends
The biggest construction companies in the UK are adapting to a shifting landscape:
- Digital Innovation: Firms like ISG leverage BIM and VR for smarter project delivery.
- Zrównoważony rozwój: Tarmac oraz BAM pioneer low-carbon materials and circular economy models.
System: How We Compiled This List
Our rankings are based on:
- Turnover: Primary metric from Companies House filings (2023-2024).
- Profitability: Pre-tax profit for financial health.
- Project Value: Barbour ABI insights on project portfolios.
- Contract Wins: Glenigan data on £40.8 billion in 2024 contracts.
- Industry Reports: Validated by The Construction Index oraz Construction News.
Data last reviewed: April 2025, ensuring a current snapshot of the Top 100 Construction Firms in the UK.
Why Trust euroloo?
Przy euroloo, we’re more than sustainable toilet and welfare suppliers – we’re construction industry partners, delivering sanitation solutions for sites nationwide. Our deep industry ties give us unique insights, making us your trusted source for the biggest construction companies in the UK.
FAQs
Who is the biggest construction company in the UK?
Balfour Beatty, with £8.59 billion in turnover, leads in infrastructure and sustainability.
How can I access the full Top 100 list?
Download our free PDF at or contact us.
What trends are shaping UK construction in 2025?
Sustainability, digital tools (BIM, VR), modular construction, and infrastructure projects like HS2.
How often is this list updated?
Annually, with the latest data reviewed in April 2025.
Can euroloo support my construction site?
Yes! We provide sustsinable portable toilets and low emission solar powered site welfare units, and more.
Get in Touch
Need sustainable toilet and welfare solutions for your site or the full Top 100 Construction Companies in the UK 2025 list? Just contact any member of our team or Download the full list now at tutaj.
Disclaimer: Data reflects publicly available financials and industry reports as of April 2025. Turnover and profit figures may vary with new filings. For updates, visit The Construction Index or Barbour ABI.
