Updated 24 October 2026 · from filed accounts
The biggest construction companies in Wales
Redrow is the biggest company among the construction companies registered in Wales by turnover, with £2.13bn in its latest filed accounts. Jones Bros. Ruthin (Civil Engineering) Co and City Energy Network follow. Together the 10 companies below turned over £2.74bn in their latest filed years.
- 1
RedrowFlintshire · Building & construction · FY to Jul 2023
£2.13bn
-0.6% on the year before
- 2Jones Bros. Ruthin (Civil Engineering) Co
Ruthin · Building & construction · FY to Mar 2025
£151m
-3.3% on the year before
- 3City Energy Network
Pontypridd · Building & construction · FY to Jan 2023
£102m
+94% on the year before
- 4Bect Building Contractors
Cardiff · Building & construction · FY to Jun 2025
£58.3m
+27% on the year before
- 5Thomas Plant Hire
Holywell · Building & construction · FY to May 2025
£56.3m
+29% on the year before
- 6Andrew Scott
Swansea · Building & construction · FY to Jun 2021
£54.6m
-8.0% on the year before
- 7Thomas Contracting
Holywell · Building & construction · FY to May 2025
£49.7m
+46% on the year before
- 8Morganstone
Swansea · Building & construction · FY to Apr 2025
£48.4m
+39% on the year before
- 9Carter Lauren Construction
Cardiff · Building & construction · FY to Mar 2025
£47.8m
-12% on the year before
- 10Tir Tai
St Asaph · Building & construction · FY to Mar 2026
£46.7m
+3.8% on the year before
How this list is made
From each company's latest accounts filed at Companies House, or its annual report for listed groups: the figures as filed, nothing estimated. Changes compare the two latest filed years. Only companies that report in pounds are ranked; groups that report in dollars or euros aren't converted. Subsidiaries whose figures are part of a listed group's are counted once, in the group. Updated daily as new accounts are filed.