| A-Star Painters & Decorators Ltd | Birmingham | 2020 |
| A-Star Plumbing & Heating (Surrey) Limited | Horley | 2015 |
| A-Star Properties Ltd | Ware | 2013 |
| A-Star Traffic Ltd | Birmingham | 2016 |
| A-Starroofing Manchester Ltd | Manchester | 2021 |
| A-Stone Ltd | Ilford | 2019 |
| A-Stute Flooring Co. Ltd | Horsham | 2025 |
| A-Symetry Ltd | London | 2011 |
| A-Team Building Construction Ltd | London | 2014 |
| A-Team Drylining Ltd | London | 2025 |
| A-Team Handyman Services Ltd | Bury St. Edmunds | 2024 |
| A-Team Interiors Ltd | Crowborough | 2004 |
| A-Team Paving Ltd | Colchester | 2022 |
| A-Team Property Group Ltd | London | 2025 |
| A-Team Rendering Ltd | Bracknell | 2010 |
| A-Teamroofing Limited | Tavistock | 2025 |
| A-Tec Electrical Limited | South Shields | 2019 |
| A-Tec Plumbing and Heating Limited | Herts | 2014 |
| A-Tec Scaffolding Limited | Ashford | 2007 |
| A-Tech Building Services Ltd | Bedford | 2014 |
| A-Tech Contracts Limited | Doune | 2010 |
| A-Tech Design & Build Limited | Wigton | 2011 |
| A-Tech Engineering Hncc Ltd | London | 2025 |
| A-Tech Heating Services Ltd | Gloucester | 2025 |
| A-Tech Installations Limited | Stroud | 2012 |
| A-Tech Property Consulting Limited | Bolton | 2016 |
| A-Tech Roofing & Cladding Services Limited | Spalding | 2020 |
| A-Tech Roofing & Guttering Ltd | Birmingham | 2025 |
| A-Tech Scaffolding Specialists Limited | Egremont | 2013 |
| A-Tek Group Limited | Cwmbran | 2018 |
| A-Tek Roofing and Cladding Ltd | Sheffield | 2022 |
| A-Tim Engineering Ltd | Great Missenden | 2019 |
| A-Vic Ltd | South Ockendon | 2018 |
| A-Vision Plumbing Ltd | Newton Aycliffe | 2022 |
| A-Wan Development Ltd | Stevenage | 2026 |
| A-Works Limited | Newmarket | 2026 |
| A-Z Home Improvements Ltd | Barnsley | 2019 |
| A-Z Builders ALL Ltd | Barnet | 2016 |
| A-Z Builders Ltd | Bexley | 2019 |
| A-Z Building and Maintenance Services Ltd | London | 2021 |
| A-Z Building Contractors Limited | London | 2005 |
| A-Z Building Maintenance Ltd | Leeds | 2017 |
| A-Z Building Solutions Ltd | South Croydon | 2020 |
| A-Z Carpentry Limited | London | 2013 |
| A-Z Concept Building Ltd | London | 2020 |
| A-Z Construction and Consultancy Limited | Ilford | 2022 |
| A-Z Construction UK Limited | Cobham | 1995 |
| A-Z Data Solutions Ltd | Mitcham | 2018 |
| A-Z Electrical & Heating Limited | London | 2012 |
| A-Z Electrical Contractors Ltd | Lytham St. Annes | 2021 |
| A-Z Electrical Install Limited | Llanelli | 2015 |
| A-Z Electrical Service Ltd | Kingston Upon Thames | 2013 |
| A-Z Facilities Management Ltd | Benfleet | 2020 |
| A-Z Flooring Ltd | Manchester | 2019 |
| A-Z General Building Services Ltd. | Enfield | 2018 |
| A-Z General Maintenance Limited | London | 2021 |
| A-Z Heating Engineers Ltd | London | 2023 |
| A-Z Home Makeovers Ltd | Cardiff | 2024 |
| A-Z Horizon Ltd | Scunthorpe | 2023 |
| A-Z House Heating Service Ltd | Bradford | 2025 |
| A-Z Infinity Ltd | Nelson | 2024 |
| A-Z Joinery Services Limited | London | 2018 |
| A-Z Joinery Solutions Ltd | London | 2025 |
| A-Z National Logistic Limited | Hounslow | 2019 |
| A-Z Odyssey Ltd | London | 2023 |
| A-Z Painting Ltd | Beaumaris | 2016 |
| A-Z Plumbing & Heating Contractors Ltd | Lytham St. Annes | 2024 |
| A-Z Plumbing Ltd | London | 2024 |
| A-Z Precision Engineering Ltd | London | 2023 |
| A-Z Precision Services Ltd | London | 2023 |
| A-Z Prime Painters Ltd | Romford | 2024 |
| A-Z Property Maintenance (Kent) Ltd | Gravesend | 2020 |
| A-Z Property Specialist Ltd | St. Albans | 2018 |
| A-Z Quality Build Ltd | Leeds | 2016 |
| A-Z Renovations & Construction Ltd | London | 2016 |
| A-Z Renovations Limited | London | 2017 |
| A-Z Roofing Limited | Carlisle | 2011 |
| A-Z Royal Heating Ltd | Birmingham | 2022 |
| A-Z Scaffolding Services Ltd | Pontefract | 2016 |
| A-Z Services MCR Ltd | Bolton | 2022 |
| A-Z UK Construction Ltd | Birmingham | 2022 |
| A-Z Ultimate Services Ltd | Orpington | 2023 |
| A-Z Ultimate Support Ltd | Ilford | 2023 |
| A-Zinc Roofing Limited | Northiam | 2014 |
| A-Zone Developments Ltd | Staines Upon Thames | 2025 |
| A. & a. Electrical Services Limited | Northampton | 1995 |
| A. & B. Electrics Limited | Swansea | 2002 |
| A. & B. Engineering (Electrical Service Division) Limited | | 1974 |
| A. & B. Engineering (Mechanical Service Division) Limited | Liverpool | 1978 |
| A. & B. Glass Company Limited | Sudbury | 1981 |
| A. & B. Homes Limited | Alresford | 1982 |
| A. & C. Damp-Proofing Limited | Penrith | 2003 |
| A. & F. Pilbeam Construction Limited | Brighton | 2008 |
| A. & H. Construction and Developments PLC | Birmingham | 1991 |
| A. & J. (Maintenance Support) Limited | Dundee | 1982 |
| A. & J. Investments Limited | Stockport | 1980 |
| A. & J. Johnstone Ltd. | Johnstone | 2003 |
| A. & J. Keith Limited | Wallsend | 1988 |
| A. & J. Stephen (Builders) Limited | Perth | 1975 |
| A. & J. Stephen (Holdings) Limited | Perth | 1975 |