| A C P Woodworking Limited | Essex | 2003 |
| A C Parker Limited | Doncaster | 2019 |
| A C Parkes Limited | Redhill | 2002 |
| A C Pembroke (Builder) Ltd | Great Yarmouth | 1998 |
| A C Pembroke (Construction) Ltd | Great Yarmouth | 2009 |
| A C Plan-Build Limited | West Midlands | 1998 |
| A C Plastering & Damp Solutions Ltd | Stoke-On-Trent | 2025 |
| A C Plastering and Construction Ltd | Uckfield | 2022 |
| A C Plastering Limited | Stockport | 2004 |
| A C PLC | London | 2008 |
| A C Professional Builder Limited | Rochdale | 2015 |
| A C Properties Airdrie Limited | Wishaw | 2016 |
| A C Property Services [Cheshire] Limited | Brynteg | 2002 |
| A C Prout Limited | Devon | 2004 |
| A C Reclamation (2025) Limited | Stroud | 2019 |
| A C Renovations (Bournemouth) Ltd | Bournemouth | 2012 |
| A C Richardson Ltd | Helston | 2008 |
| A C Roofing (Yorkshire) Ltd | Leeds | 2022 |
| A C Roofing and Cladding Services Ltd | Dewsbury | 2017 |
| A C Roofing Group Ltd | Oxfordshire | 2024 |
| A C Rowland Limited | Skipton | 2003 |
| A C Rowntree Limited | Durham | 2024 |
| A C S (2000) Limited | Stevenage | 2000 |
| A C S Bower Limited | Carterton | 2004 |
| A C S Installlation Limited | Romford | 2015 |
| A C Scaffolding Ltd | Walsall | 2016 |
| A C Services (Marlow) Ltd | Maidenhead | 2011 |
| A C Sharp Heating Ltd | Dundee | 2023 |
| A C Shopfitters Ltd | Wakefield | 2016 |
| A C Smart Tiling Limited | Bampton | 2011 |
| A C Smith & SON Limited | Alton | 2002 |
| A C Solutions Group Limited | Watford | 1982 |
| A C Stocky Limited | Norwich | 2026 |
| A C Superior Services Limited | Leeds | 2026 |
| A C T Construction (North West) Limited | Lancashire | 2006 |
| A C Thomas Construction Limited | Leigh On Sea | 2016 |
| A C UK Group Ltd | Uxbridge | 2017 |
| A C Utilities (North East) Ltd | Durham | 2018 |
| A C Utilities Limited | Preston | 2010 |
| A C V Elevator Electrical Limited | Tamworth | 2012 |
| A C Weller Ltd | Horsham | 2018 |
| A C Whyte & Co Limited | Glasgow | 1973 |
| A C Windows (Beverley) Limited | Driffield | 2003 |
| A C Wing Contractors Limited | Deal | 2009 |
| A C Wolfe Ltd | Leicester | 2025 |
| A Cabling Ltd | Woodford Green | 2025 |
| A Cahill Limited | London | 2003 |
| A Caines Groundworks Ltd | Clacton-On-Sea | 2017 |
| A Caisin Limited | Ilford | 2016 |
| A Campbell Electrical Services Ltd | Isle Of Lewis | 2006 |
| A Campbell Heating & GAS Ltd | Wigan | 2022 |
| A Carcea Ltd | Romford | 2022 |
| A Carey Electrical Ltd | Helston | 2023 |
| A Carroll Double Glazing Limited | Glasgow | 2008 |
| A Carruthers Design and Build Ltd | Carlisle | 2025 |
| A Carson Brickwork Contractor Ltd | Southport | 2002 |
| A Catlow Civil Engineering Limited | Northampton | 2001 |
| A Catlow Complete Utilities Ltd | Mexborough | 2023 |
| A Caughey Electrical Services Ltd | Romford | 2016 |
| A Chalmers Services Limited | Henley-On-Thames | 2025 |
| A Chaney Services Ltd | Mitcham | 2026 |
| A Chappell Landscaping and Building Alterations Ltd | London | 2024 |
| A Charlton Builders Limited | Sunderland | 2002 |
| A Charlton Construction Ltd | Deal | 2022 |
| A Chereches Ltd | Northampton | 2016 |
| A Cherry Ltd | Edgware | 2012 |
| A Chester Roofing Limited | Durham | 2025 |
| A Childs Ltd | Leamington Spa | 2014 |
| A Chudzik Limited | | 2003 |
| A Clark & SON Plumbing and Heating Ltd | Kilmarnock | 2026 |
| A Clark Building Solutions Ltd | East Kilbride | 2022 |
| A Clarke Carpets & Flooring Ltd | Colchester | 2017 |
| A Clarke Construction Services Limited | Chorley | 2019 |
| A Clarke Flooring Limited | Spennymoor | 2025 |
| A Clarke Plastering Ltd | Devizes | 2024 |
| A Clarke Plumbing & Heating Ltd | Basingstoke | 2026 |
| A Clarke Telecommunications Ltd | Leyland | 2023 |
| A Class Air-Conditioning Systems Limited | Stevenage | 2020 |
| A Class Builders Ltd | Birmingham | 2025 |
| A Class Ceilings and Partitions Ltd | Chorley | 2015 |
| A Class Cleaners and Labourers Limited | London | 2024 |
| A Class Construction Southern Limited | Southampton | 2013 |
| A Class Contractors Ltd | Westerham | 2011 |
| A Class Engineering Ltd | Sheffield | 2025 |
| A Class Interiors Limited | London | 2019 |
| A Class Metal Roofing Limited | Welling | 2013 |
| A Class Plastering Ltd | Martock | 2015 |
| A Class Plumbing & Electrical Limited | Thornton Cleveleys | 2011 |
| A Class Polishers Limited | London | 2021 |
| A Class Properties Limited | Weston-Super-Mare | 2025 |
| A Class Property Care Ltd | Cambridge | 2009 |
| A Class Property Services Limited | Rowley Regis | 2016 |
| A Class Renovations Ltd | Battle | 2024 |
| A Class Roofing & Building Services Ltd | Halstead | 2017 |
| A Class Roofing and Contractors Limited | Wisbech | 2025 |
| A Class Roofing Services Ltd | Sheerness | 2025 |
| A Class Scaffolding Ltd | Bridlington | 2025 |
| A Class Services Home and Garden Ltd | King'S Lynn | 2024 |
| A Class Windows & Doors Ltd | Slough | 2023 |
| A Class Windows & Doors Scotland Limited | Clydebank | 2025 |