Top Construction Companies in the UK

The United Kingdom’s construction sector is one of the largest in Europe, and the firms at the top of it build everything from motorways and railways to hospitals, power stations, and city-centre towers. The companies behind that work range from global infrastructure groups listed on the London Stock Exchange to family-owned builders that have operated in Britain for more than a century.

This post ranks the largest construction companies in the UK by annual turnover, using The Construction Index’s Top 100 Construction Companies 2025 edition. Every turnover figure and rank below comes from that list; company sites and trade press are linked throughout for headquarters, projects, and recognition.

The top construction companies in the UK

Here are the 20 largest construction companies in the UK by turnover, per The Construction Index’s 2025 ranking.

Source: The Construction Index Top 100 2025 (turnover).

Balfour Beatty

Headquarters: London, England Turnover (The Construction Index 2025): £8,234.0 million — rank #1

Balfour Beatty is the UK’s largest contractor and a global infrastructure group, founded in 1909 and now headquartered at Canary Wharf in London. The company employs roughly 26,000 people across the UK, the United States, and Hong Kong, and works across the full infrastructure lifecycle, from financing and design through construction and long-term asset maintenance.

Balfour Beatty’s services include:

• building construction
• highways, bridges, and heavy civil engineering
• rail infrastructure
• power transmission and distribution
• infrastructure investment and asset management

The company has extensive experience servicing the following sectors:

• highways and transport
• rail
• energy and utilities
• defence and government
• health, education, and commercial buildings

Balfour Beatty leads several of the UK’s largest current programmes. In 2026 the company was appointed to deliver the Leeds Inner Ring Road Strategy, a seven-year, £120 million programme, and was awarded a £325 million contract by SSEN to deliver the Netherton Hub as part of the UK’s electricity-network upgrade.

Morgan Sindall Group

Headquarters: London, England Turnover (The Construction Index 2025): £4,546.2 million — rank #2

Morgan Sindall Group is a construction and regeneration group headquartered at Kent House in central London and led by group chief executive John Morgan, who co-founded the business. The group traces to 1977 and took its current form with the 1994 merger of Morgan Lovell and William Sindall plc. It operates through divisions covering construction, infrastructure, fit-out, property services, and urban regeneration.

Morgan Sindall’s services include:

• construction and civil engineering
• infrastructure delivery
• commercial fit-out
• affordable housing and property services
• mixed-use urban regeneration

The company has extensive experience servicing the following sectors:

• education
• healthcare
• transport and highways
• commercial and public buildings
• residential and regeneration

Morgan Sindall Construction recently completed the £29.89 million Armada Way public-space regeneration in Plymouth, handed over in mid-2026, and has begun work on the new £53 million Llangatwg Community School in Neath, one of a number of publicly funded education projects in its pipeline.

Kier Group

Headquarters: Salford, Greater Manchester, England Turnover (The Construction Index 2025): £3,905.1 million — rank #3

Kier Group is a construction and infrastructure-services business with roots stretching back around a century, now headquartered at Clippers Quay in Salford and led by chief executive Stuart Togwell. The company employs close to 10,000 people, supported by a wide network of supply-chain partners, and delivers both building and infrastructure work across the public and regulated sectors.

Kier’s services include:

• building construction
• highways maintenance and infrastructure
• utilities and water-sector delivery
• property development
• facilities and asset management

The company has extensive experience servicing the following sectors:

• highways and transport
• water and utilities
• education and healthcare
• defence and justice
• local and central government

Kier continues to win major public frameworks. In 2026 the company secured a place on the £1.5 billion YORbuild Major Works 2 framework and won more than £51 million of Severn Trent AMP8 wastewater upgrades across three sites, part of the water sector’s current investment cycle.

Laing O’Rourke

Headquarters: Dartford, Kent, England Turnover (The Construction Index 2025): £2,394.5 million — rank #4

Laing O’Rourke is a privately owned, international engineering and construction firm headquartered in Dartford and led by group chief executive Cathal O’Rourke. Formed in 2001, with a lineage that runs back through John Laing to the nineteenth century, the company is known for engineering-led delivery and for self-performing much of its own work, including offsite manufacturing. Its 2025 ranking marks a sharp climb up the turnover table, backed by a strong recovery: FY24 results reported pre-exceptional operating profit up 42% to £157.7 million and a record order book of £17.2 billion.

Laing O’Rourke’s services include:

• engineering and design
• building and civil construction
• offsite manufacturing and modular construction
• self-delivery of specialist trades
• digital engineering and delivery

The company has extensive experience servicing the following sectors:

• healthcare
• nuclear and energy
• transport infrastructure
• sports and leisure venues
• advanced manufacturing and data centres

Laing O’Rourke was named one of ten construction partners to the NHS New Hospital Programme’s Hospital 2.0 Alliance in 2026, a national programme standardising how new hospitals are designed and built. The firm’s engineering reputation rests on projects such as Hinkley Point C nuclear power station and major stadium and transport work across the UK.

Mace

Headquarters: London, England Turnover (The Construction Index 2025): £2,356.8 million — rank #5

Mace is a London-based construction and consultancy business founded in 1990. In March 2026 the group carved into two independent businesses — Mace Consult and Mace Construct — separating its programme-management and consultancy work from its construction delivery; the turnover figure above predates that split. Across both arms, Mace is known for delivering large, complex projects in central London and internationally.

Mace’s services include:

• construction delivery and management
• programme and project management
• cost and commercial consultancy
• design and engineering advisory
• facilities management

The company has extensive experience servicing the following sectors:

• transport and rail infrastructure
• commercial offices and mixed-use
• data centres
• public buildings and cultural venues
• residential

Mace leads the construction of HS2’s Euston station through a joint venture, delivering the future southern terminus of the high-speed line in central London. On the consultancy side, Mace Consult was appointed to four lots on the government’s Construction Professional Services 2 framework in 2026, its third consecutive place on that framework.

Wates Group

Headquarters: Leatherhead, Surrey, England Turnover (The Construction Index 2025): £2,296.3 million — rank #6

Wates is one of the UK’s largest privately owned, family-run construction and property-services businesses, founded in 1897 by Edward Wates and now in its fourth generation of family ownership. Headquartered in Leatherhead and led by group chief executive Eoghan O’Lionaird, the company employs around 6,000 people and reported a record year in its most recent results, with turnover it puts at £2.56 billion and a forward order book of roughly £10 billion.

Wates’ services include:

• construction and commercial building
• residential development
• social housing and property maintenance
• fit-out and refurbishment
• heritage and restoration work

The company has extensive experience servicing the following sectors:

• education and healthcare
• commercial and workplace
• residential and affordable housing
• heritage and civic buildings
• industrial and logistics

Wates delivered 11 & 12 Wellington Place in Leeds, the first new UK building to achieve a certified NABERS UK Five Star energy rating alongside a BREEAM Outstanding rating. Its recent heritage work includes the restoration of Derby’s Grade II-listed Victorian Market Hall, completed with Gold and Silver Considerate Constructors Scheme awards.

M Group

Headquarters: Stevenage, Hertfordshire, England Turnover (The Construction Index 2025): £2,196.0 million — rank #7

M Group, formerly M Group Services, is an infrastructure-services group rather than a building contractor: it maintains, upgrades, and extends the UK’s utility, transport, and telecoms networks, delivered through around 20 specialist brands and roughly 14,000 people under chief executive Andrew Findlay. The company rebranded to M Group around 2024, and its latest results put turnover well above its 2025 ranking figure — £3.1 billion for FY25/26, with a £10.4 billion order book. Its inclusion here reflects the scale of its network-services work rather than general building construction.

M Group’s services include:

• water and energy network delivery
• transport and highways maintenance
• telecoms and fibre infrastructure
• power connections and grid works
• civils and structures maintenance

The company has extensive experience servicing the following sectors:

• water and wastewater
• energy and power networks
• transport and highways
• telecommunications
• utilities and regulated infrastructure

M Group’s transport arm was awarded a £119 million Transport for London contract for bridges and civil-structures maintenance in 2026, one of the larger recent additions to an order book the group has built through both organic growth and acquisition.

Vinci Construction UK

Headquarters: Watford, England Turnover (The Construction Index 2025): £2,125.5 million — rank #8

Vinci Construction UK is the British building-and-civil-engineering arm of the French infrastructure group VINCI, and the closest of the mid-table firms to a pure contractor. Headquartered in Watford, it employs around 6,700 people in the UK and operates through businesses including Vinci Building, Taylor Woodrow, Ringway, and Vinci Facilities, spanning construction, civil engineering, and facilities management.

Vinci Construction UK’s services include:

• building construction
• civil engineering
• facilities management
• highways maintenance
• design and engineering

The company has extensive experience servicing the following sectors:

• commercial and industrial buildings
• transport infrastructure
• education and healthcare
• defence and government
• manufacturing and energy

Vinci Building was selected to construct the UK’s largest open-die forging facility for Sheffield Forgemasters, a £138 million project. The company has also pushed on construction technology, running a UK-first trial of an autonomous excavator to help build a car park at Manchester Airport.

Tarmac

Headquarters: Solihull, West Midlands, England Turnover (The Construction Index 2025): £2,006.9 million — rank #9

Tarmac is the UK’s leading supplier of construction materials, part of CRH plc, and appears on this list as a materials producer rather than a general contractor. Headquartered in Solihull, the company produces aggregates, asphalt, cement, concrete, and building products, and also delivers contracting and highways-maintenance services. Its scale on this ranking reflects the volume of materials it supplies into projects run by the contractors above.

Tarmac’s services include:

• aggregates, asphalt, and cement production
• ready-mixed concrete and building products
• highways surfacing and maintenance
• contract surfacing services
• lime and powders for industrial use

The company has extensive experience servicing the following sectors:

• highways and road infrastructure
• rail
• residential and commercial construction
• energy and industrial
• public infrastructure

Tarmac continues to invest in lower-carbon materials, opening a sustainable asphalt plant at Barrasford in Northumberland that uses a high proportion of recycled asphalt and cuts production emissions. The company also became the first UK aggregates supplier to secure ISO 19443 certification for nuclear-materials supply, a nuclear-industry quality standard.

Amey

Headquarters: London, England Turnover (The Construction Index 2025): £1,876.8 million — rank #10

Amey is an infrastructure support-services and maintenance provider rather than a pure builder, designing, operating, and maintaining critical assets across the UK’s transport, utilities, and public-sector estates. Headquartered in central London and led by chief executive Andy Milner, the company holds long-term contracts to keep roads, railways, and public buildings running, and its place on this ranking reflects the scale of that operations-and-maintenance work.

Amey’s services include:

• highways operations and maintenance
• rail engineering and asset management
• facilities management
• water and utilities services
• consulting and advisory

The company has extensive experience servicing the following sectors:

• highways and transport
• rail
• defence and secure environments
• water and utilities
• justice and public buildings

Amey supports Transport for Wales on the Core Valley Lines programme, including the battery-powered rolling stock behind its “smart electrification” approach. The company also delivers control and telemetry work for Thames Water, linking network monitoring to the operation of London’s Thames Tideway “super sewer.”

Bridgit is the workforce planning software of choice for construction companies in the UK

The firms ranked above run some of the largest and most complex programmes in the country, and every one of them depends on getting the right people onto the right projects at the right time. Most of the industry still coordinates that work across spreadsheets and disconnected systems. Bridgit gives construction teams a single place to plan it.

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• keep project and people data in one source of truth

Learn more about Bridgit, or book a demo to see it on your own projects.

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