Updated 30 October 2026 · from filed accounts
The biggest energy companies in South East
Cubicle Washroom Systems is the biggest company among the energy companies registered in South East by turnover, with £9.67m in its latest filed accounts. Robertet(U.K.) and Kellogg Brown & Root Solutions follow. Together the 10 companies below turned over £26.2m in their latest filed years.
- 1Cubicle Washroom Systems
Hampshire · Energy · FY to Dec 2025
£9.67m
+6.1% on the year before
- 2
Robertet(U.K.)Surrey · Energy · FY to Dec 2022
£9.05m
-13% on the year before
- 3Kellogg Brown & Root Solutions
Leatherhead · Energy · FY to Dec 2025
£3.63m
+62% on the year before
- 4Mavala UK
Crowthorne · Energy · FY to Dec 2025
£2.63m
+7.0% on the year before
- 5Aa Heating Group
Fareham · Energy · FY to Mar 2025
£691k
Turnover
- 6Valvenok
Bicester · Energy · FY to Mar 2025
£161k
+3226400% on the year before
- 7Pce Solutions
Fareham · Energy · FY to Mar 2025
£130k
+23% on the year before
- 8Evans Eng. Consultancy
High Wycombe · Energy · FY to Mar 2025
£115k
-3.8% on the year before
- 9JCW Engineering Consultants
High Wycombe · Energy · FY to Mar 2025
£46.5k
-65% on the year before
- 10Mjam
Didcot · Energy · FY to Aug 2025
£27.4k
+69% 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.
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