| ACT Construction Management Ltd | Preston | 2019 |
| ACT Constructions Ltd | Romford | 2026 |
| ACT Country Limited | London | 2025 |
| ACT Data Centre Fit OUT ( UK ) Limited | Greenock | 2019 |
| ACT Developments London Limited | London | 2012 |
| ACT Direct Limited | Cheltenham | 2000 |
| ACT Electrical & Plumbing Ltd | London | 2019 |
| ACT Electrical (Cumbria) Ltd | Cleator Moor | 2021 |
| ACT Electrical Contractor Ltd | Worcester | 2017 |
| ACT Electrical NW Ltd | Llandudno | 2020 |
| ACT Electrical Solutions Limited | Lowestoft | 2025 |
| ACT Electrics Ltd | London | 2024 |
| ACT Fast Roofing and Building Ltd | Leighton Buzzard | 2025 |
| ACT Fast Roofing Ltd | Stockport | 2025 |
| ACT Formwork Ltd | Liverpool | 2025 |
| ACT Group Property Development Ltd | Falkirk | 2024 |
| ACT Homes Limited | Ingatestone | 2020 |
| ACT Industrial Buildings Ltd | Leicester | 2018 |
| ACT Insulation Ltd | Sunderland | 2013 |
| ACT Masonry Limited | Gloucestershire | 2007 |
| ACT Plumbing and Heating Ltd | Newnham | 2018 |
| ACT Property Developments Limited | Manchester | 2019 |
| ACT Property Maintenance Limited | Chelmsford | 2012 |
| ACT Refurbishments Ltd | York | 2025 |
| ACT Roofing Ltd | Wakefield | 2004 |
| ACT Scaffolding Services Ltd | Barnsley | 2015 |
| ACT Smart Construction Ltd | Harlow | 2022 |
| ACT Surfaces Limited | Worcester | 2013 |
| Act-Building Services Ltd | Luton | 2020 |
| ACT4HOME Ltd | Isleworth | 2003 |
| Acta Construction Limited | Glasgow | 2014 |
| Acta Crane Hire Limited | Ringwood | 2024 |
| Acta Solutions Ltd | Solihull | 2020 |
| Actaeon Solutions Group Ltd | Altrincham | 2015 |
| Actavo (P.D.C.) Limited | Birmingham | 1998 |
| Actavo Building Solutions (UK) Limited | Birmingham | 2009 |
| Actcare Limited | Benfleet | 2004 |
| Actemium UK Limited | Birmingham | 1900 |
| Acten Limited | Sutton Coldfield | 2005 |
| Actfast Solutions Limited | Farnborough | 2009 |
| Acticrete Ltd | London | 2022 |
| Actifix Ltd | Andover | 2015 |
| Actigas Ltd | Sutton | 2022 |
| Actimec Limited | Luton | 2020 |
| Actimus Solution Ltd | Edgware | 2023 |
| Actin Limited | Erith | 2017 |
| Actinica Limited | Corby | 2025 |
| Action Alarms Limited | Bournemouth | 1999 |
| Action BPM Limited | Cramlington | 2009 |
| Action Builders Limited | | 1991 |
| Action Building Services Ltd | London | 2018 |
| Action Building Solutions Ltd | Pont-Y-Clun | 2021 |
| Action Carpentry Ltd | London Colney | 2022 |
| Action Carpets Limited | Ashford | 2004 |
| Action Clad 2001 Limited | Staffordshire | 2000 |
| Action Commercial Interiors Ltd | Brentford | 2018 |
| Action Demolition Limited | Newark | 2005 |
| Action Developers Limited | London | 2023 |
| Action Developments (SCO) Ltd | Gullane | 2016 |
| Action Driveways Ltd | Birmingham | 2024 |
| Action Electrical Ltd | Bathgate | 2021 |
| Action Elgin Limited | Elgin | 2015 |
| Action Engineers Limited | Harrow | 2020 |
| Action Enterprises Ltd | Gullane | 2013 |
| Action Facilities & Management Ltd | Leeds | 2026 |
| Action Glass & Glazing Limited | Middlesbrough | 2003 |
| Action Group North East Limited | Cramlington | 2009 |
| Action Health (IRE) Ltd | Gullane | 2016 |
| Action Heat Group Limited | Blythe Bridge | 2023 |
| Action Heating Cornwall Ltd | St. Austell | 2018 |
| Action Heating Limited | Buckinghamshire | 2004 |
| Action Home Improvements Limited | Barnet | 2009 |
| Action Interiors Ltd | Swanscombe | 2021 |
| Action Joinery Limited | N E Lincolnshire | 2002 |
| Action MAN Roofing Services Ltd | Wotton Under Edge | 2023 |
| Action Management Solutions Limited | Canvey Island | 2012 |
| Action Packed Limited | Chalfont St.Peter | 1988 |
| Action Patch Planing Ltd | Mansfield | 2014 |
| Action Plumbing (Leicester) Limited | Nottingham | 2002 |
| Action Plumbing Limited | Southwick | 2009 |
| Action Properties Maintenance (London) Ltd | Stratford Upon Avon | 2024 |
| Action Property Group Ltd | Eastbourne | 2026 |
| Action Property Maintenance Ltd | Port Talbot | 2011 |
| Action Property Services Ltd | London | 2016 |
| Action Property Solutions Ltd | London | 2022 |
| Action Property Support Ltd. | London | 2019 |
| Action Rail Civics Limited | Cardiff | 2017 |
| Action Response Limited | London | 2003 |
| Action Roofing (Scotland) Ltd. | Bellshill | 2004 |
| Action Roofing Leeds Ltd | Whetstone | 2020 |
| Action Services 247 Ltd | Pontefract | 2024 |
| Action Shutters Limited | London | 1993 |
| Action Storage Systems Ltd | Headcorn | 1986 |
| Action Technical Services and Contracting UK Limited | Ashford | 2020 |
| Action Topcare Services UK Ltd | Kent | 2021 |
| Action Wall Ties Ltd. | Ramsgate | 1998 |
| Action Workspace Limited | Burgess Hill | 2019 |
| Actionblast Ltd | Droitwich | 2016 |
| Actionbrook Services Limited | Billericay | 1997 |
| Actionfigrd Ltd | London | 2023 |