Top 30 Construction Companies Wales 2026
Last updated: November 2026 | Source: Barbour ABI
The Top 30 Construction Companies Wales League Table shows you the top contractors working across the region in an easy-to-use interactive table. All company rankings are sourced directly from our leading Construction Project Leads Platform.
The top contractors league tables rank main contractors by the total value of the contract awards they have won. Only projects with a start date falling between six months before and six months after the dataset date are counted towards a contractor’s ranking. This dataset covers April 2026 to April 2027. Discover the biggest contractors shaking up the UK industry in our table below.
Mercury Engineering is Top Construction Company in Wales
According to Barbour ABI’s extensive planning data, the top construction company in Wales is Mercury Engineering with 1 project valued at £285m.
2nd place – Graham Construction – 1 project valued at £200m
3rd place – MTX Contracts – 1 projects valued at £187m
View other top construction company rankings by region and city
Regional Tables: UK | London | South East | South West | East of England | East Midlands | West Midlands | Northern Ireland | North West | Wales | Yorkshire & the Humber | North East | Scotland
City and County Tables: Aberdeen | Birmingham | Bristol | Cheshire East | Cheshire West & Chester | East Sussex | West Sussex | Essex | Hampshire | Hertfordshire | Leeds | Liverpool | Manchester | Newcastle-Upon Tyne | Norwich | Nottingham | Sheffield | South Yorkshire | West Yorkshire
Key findings: top construction companies in Wales
- The top 30 Welsh construction companies are working on 104 projects worth a combined £2.4bn.
- The top 5 contractors hold £1.0bn, or 41% of the table’s total value, across 14 projects (13% of all projects).
- The largest main contractor by project value is Mercury Engineering, with 1 project worth £285m.
- Two contractors tie for the largest by project count: Wynne Construction and Jones Brothers Ruthin (Civil Engineering) Limited, each with 9 projects. Wynne’s are worth £87m and Jones Brothers’ £61m.
Top 30 Construction Companies Wales 2027 League Table
| Position | Contractor | Region | Number of Projects | Total Value | View Projects |
|---|---|---|---|---|---|
| 1 | Mercury Engineering | Wales | 1 | £ 285,000,000 | View projects |
| 2 | Graham Construction Limited | Wales | 1 | £ 200,000,000 | View projects |
| 3 | MTX Contracts Limited | Wales | 3 | £ 187,000,000 | View projects |
| 4 | Intelle Construction Limited | Wales | 5 | £ 161,934,400 | View projects |
| 5 | Barratt Homes | Wales | 4 | £ 150,080,000 | View projects |
| 6 | FI Real Estate Management | Wales | 5 | £ 115,319,000 | View projects |
| 7 | Andrew Scott Limited | Wales | 8 | £ 114,170,600 | View projects |
| 8 | Willmott Dixon Holdings Ltd | Wales | 5 | £ 102,087,900 | View projects |
| 9 | Morgan Sindall Group | Wales | 8 | £ 97,615,000 | View projects |
| 10 | Wynne Construction | Wales | 9 | £ 87,037,365 | View projects |
| 11 | Castle Green Homes | Wales | 4 | £ 81,460,000 | View projects |
| 12 | The Edenstone Group | Wales | 3 | £ 71,990,000 | View projects |
| 13 | Wates Construction Limited | Wales | 5 | £ 68,748,448 | View projects |
| 14 | Jones Brothers Ruthin (Civil Engineering) Limited | Wales | 9 | £ 60,633,094 | View projects |
| 15 | Starburst (UK) Limited | Wales | 2 | £ 57,867,000 | View projects |
| 16 | Kier Group | Wales | 4 | £ 53,740,388 | View projects |
| 17 | Llanmoor Development Company Limited | Wales | 3 | £ 52,220,000 | View projects |
| 18 | Persimmon Homes (East Yorkshire) Limited | Wales | 3 | £ 50,900,000 | View projects |
| 19 | Read Construction Holdings Limited | Wales | 6 | £ 43,059,000 | View projects |
| 20 | Berkeley DeVeer | Wales | 1 | £ 41,800,000 | View projects |
| 21 | Watkin Jones & Sons | Wales | 1 | £ 40,000,000 | View projects |
| 22 | Taylor Wimpey | Wales | 2 | £ 38,600,000 | View projects |
| 23 | St Modwen | Wales | 1 | £ 37,380,000 | View projects |
| 24 | Portal Construction NW Limited | Wales | 1 | £ 35,866,000 | View projects |
| 25 | Countryside Homes | Wales | 1 | £ 35,640,000 | View projects |
| 26 | SJ Roberts Homes | Wales | 5 | £ 30,535,813 | View projects |
| 27 | Elgin Energy ES Co Limited | Wales | 1 | £ 30,000,000 | View projects |
| 28 | BioConstruct GmbH | Wales | 1 | £ 30,000,000 | View projects |
| 29 | Robinson & Lawlor Limited | Wales | 1 | £ 30,000,000 | View projects |
| 30 | Marshall Holdings Limited | Wales | 1 | £ 30,000,000 | View projects |
| Position | Contractor | Region | Number of Projects | Total Value | View Projects |
|---|---|---|---|---|---|
| 1 | Mercury Engineering | Wales | 1 | £ 285,000,000 | View projects |
| 2 | Graham Construction Limited | Wales | 1 | £ 200,000,000 | View projects |
| 3 | MTX Contracts Limited | Wales | 3 | £ 187,000,000 | View projects |
| 4 | Intelle Construction Limited | Wales | 5 | £ 161,934,400 | View projects |
| 5 | Barratt Homes | Wales | 4 | £ 150,080,000 | View projects |
| 6 | FI Real Estate Management | Wales | 5 | £ 115,319,000 | View projects |
| 7 | Andrew Scott Limited | Wales | 8 | £ 114,170,600 | View projects |
| 8 | Willmott Dixon Holdings Ltd | Wales | 5 | £ 102,087,900 | View projects |
| 9 | Morgan Sindall Group | Wales | 8 | £ 97,615,000 | View projects |
| 10 | Wynne Construction | Wales | 9 | £ 87,037,365 | View projects |
| 11 | Castle Green Homes | Wales | 4 | £ 81,460,000 | View projects |
| 12 | The Edenstone Group | Wales | 3 | £ 71,990,000 | View projects |
| 13 | Wates Construction Limited | Wales | 5 | £ 68,748,448 | View projects |
| 14 | Jones Brothers Ruthin (Civil Engineering) Limited | Wales | 9 | £ 60,633,094 | View projects |
| 15 | Starburst (UK) Limited | Wales | 2 | £ 57,867,000 | View projects |
| 16 | Kier Group | Wales | 4 | £ 53,740,388 | View projects |
| 17 | Llanmoor Development Company Limited | Wales | 3 | £ 52,220,000 | View projects |
| 18 | Persimmon Homes (East Yorkshire) Limited | Wales | 3 | £ 50,900,000 | View projects |
| 19 | Read Construction Holdings Limited | Wales | 6 | £ 43,059,000 | View projects |
| 20 | Berkeley DeVeer | Wales | 1 | £ 41,800,000 | View projects |
| 21 | Watkin Jones & Sons | Wales | 1 | £ 40,000,000 | View projects |
| 22 | Taylor Wimpey | Wales | 2 | £ 38,600,000 | View projects |
| 23 | St Modwen | Wales | 1 | £ 37,380,000 | View projects |
| 24 | Portal Construction NW Limited | Wales | 1 | £ 35,866,000 | View projects |
| 25 | Countryside Homes | Wales | 1 | £ 35,640,000 | View projects |
| 26 | SJ Roberts Homes | Wales | 5 | £ 30,535,813 | View projects |
| 27 | Elgin Energy ES Co Limited | Wales | 1 | £ 30,000,000 | View projects |
| 28 | BioConstruct GmbH | Wales | 1 | £ 30,000,000 | View projects |
| 29 | Robinson & Lawlor Limited | Wales | 1 | £ 30,000,000 | View projects |
| 30 | Marshall Holdings Limited | Wales | 1 | £ 30,000,000 | View projects |
How are these tables ranked?
The top contractors league tables are ranked by total contract award value won by the main contractor. The projects that influence the ranking have a start date from 6 months back through to 6 months forward.
How to use this league table
Top construction companies are ranked by value by default, but you have several ways to customise your view:
- Number of results: Use the display toggle to show between 10 and all 100 companies at once.
- Project value: Click the value column to switch between highest and lowest.
- Search: Use the search bar in the upper right hand corner of the table to search for project names, values, start dates, or positions.
- Number of projects: Click the number of projects column to switch between the highest and lowest project count for each company
- Alphabetical sorting: Click the project name, sector, or location columns to sort A–Z or Z–A.
Want to see the projects behind the rankings?
Get in touch today to see the projects the UK’s top contractors are working on, key roles associated to the projects, and their industry relationships. Request 10 free leads below and we’ll be in touch to source the companies you want to target.
View more top construction companies in 2027
Get a free monthly update on the top performers in the industry
Barbour ABI produces a Top 50 report every month directly on our website that highlights the top performers in construction. It showcases the top:
- Contractors
- Architects
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The report is published each month and provides a 12 month review to see who’s consistently in the top rankings.
Top Construction Projects League Tables
Access the top 100 construction projects happening in the UK. The projects are ranked by total value of projects across a 12-month period and can be filtered by sector, location, start date, value, and links straight to the Barbour ABI project leads platform. View the top construction projects overall in the UK as well as major regions and cities.
View the Top Construction Tenders League Tables
FAQs
- Mercury Engineering
- Graham Construction Limited
- MTX Contracts Limited
- Intelle Construction Limited
- Barratt Homes
- FI Real Estate Management
- Andrew Scott Limited
- Willmott Dixon Holdings Ltd
- Morgan Sindall Group
- Wynne Construction
By project value: Mercury Engineering, with £285m from 1 project. Graham Construction Limited follows at £200m.
By project count: A tie between Wynne Construction and Jones Brothers Ruthin (Civil Engineering) Limited, each with 9 projects. Wynne’s are worth £87m and Jones Brothers’ £61m.
A tier 1 contractor is the main contractor appointed directly by the client to deliver a construction project, taking overall responsibility for programme, cost, quality and safety. It manages the supply chain beneath it, appointing and coordinating the tier 2 subcontractors and tier 3 suppliers who carry out the specialist works.
No, it is ranked by the value of total projects reported on Barbour ABI’s Construction Project Leads Platform.
The League Tables produced by Barbour ABI are updated on a quarterly basis.
Clients of Barbour ABI can view the companies and projects behind our rankings directly on the platform. If you’re not a client and would like to see how you could use our advanced construction data to help win more work, book a free demo today.
