| Addae Construction Limited | Enfield | 2022 |
| Addair Services Limited | Orpington | 2020 |
| Addalevel Building Services Limited | Greenhithe | 2025 |
| Addams Family Estate Limited | Llanfairpwllgwyngyll | 2024 |
| Addana Property Limited | St. Albans | 2017 |
| Addapt Roofing and Building Contractors Ltd | Cardiff | 2012 |
| Addasset Build Limited | London | 2020 |
| Addcharge Energy Ltd | Hemel Hempstead | 2026 |
| Addcharge Ltd | Hemel Hempstead | 2021 |
| Addclad Industrial Cladding Limited | Derby | 2009 |
| Addeco Limited | Stoke On Trent | 2009 |
| Added Security Limited | Leicester | 2018 |
| Added Security Technology (London) Limited | Witham | 2006 |
| Added Space Ltd | Harlow | 2018 |
| Added Value FMC Ltd | Chester | 2017 |
| Addelec Electrical Ltd | Southport | 2013 |
| Addelec Limited | London | 2008 |
| Addems & Hambling Limited | Eastbourne | 2014 |
| Addeo Ltd | London | 2026 |
| Addeo Property Investments Ltd | Daventry | 2025 |
| Adder Group Ltd | Kidderminster | 2020 |
| Adderbury Electrical Services Limited | Banbury | 2018 |
| Addergoole Consultancy Ltd | Bolton | 2024 |
| Adderley Alarms Ltd | Birmingham | 2021 |
| Adderley Interiors Ltd | West Bromwich | 2020 |
| Adderley Masonry Limited | Faversham | 2017 |
| Adderley Property Trading Ltd | Bexley | 2021 |
| Adderley Repair Ltd | Smethwick | 2022 |
| Adderley Technical Consulting Limited | Whitstable | 2023 |
| Adderstone (Ralph) Developments Limited | Newcastle Upon Tyne | 2014 |
| Adderstone Civils Limited | Newcastle Upon Tyne | 2024 |
| Adderstone Construction Limited | Newcastle Upon Tyne | 2023 |
| Adderstone Developments (110) Limited | Newcastle Upon Tyne | 2019 |
| Adderstone Developments (111) Limited | Newcastle Upon Tyne | 2019 |
| Adderstone Developments (Stock) Limited | Newcastle Upon Tyne | 2015 |
| Adderstone Facades Limited | Newcastle Upon Tyne | 2025 |
| Adderstone Living Limited | Newcastle Upon Tyne | 2020 |
| Adderstone Nova Limited | London | 2025 |
| Adderstone Projects Limited | Newcastle Upon Tyne | 2005 |
| Addex Construction & Consultancy Limited | Leamington Spa | 2018 |
| Addheat Plumbing & Heating Limited | Ramsgate | 2019 |
| Addie Facility Management Ltd | Lanark | 2025 |
| Addie Flooring Ltd | Glasgow | 2019 |
| Addiethebaddy Ltd | Yarm | 2024 |
| Addiewell Plumbing and Heating Ltd | West Calder | 2020 |
| Addington (Formwork) Limited | London | 1979 |
| Addington Construction & Maintenance Ltd | Felixstowe | 2025 |
| Addington Construction Limited | London | 1993 |
| Addington Developments SW Ltd | Bideford | 2022 |
| Addington Farm Limited | Exeter | 2022 |
| Addingtons Associates Limited | Rushden | 2011 |
| Addingtons Kitchens and Bathrooms Limited | Northampton | 2026 |
| Addingtons Landscape Design Limited | Northampton | 2017 |
| Addinston Limited | London | 2016 |
| Addinstyle UK Limited | Rustington | 2018 |
| Addis Construction Limited | Keighley | 2007 |
| Addis Homes Construction Ltd | Poole | 2021 |
| Addis Homes Group Ltd | Poole | 2021 |
| Addis Homes Ltd | Poole | 2015 |
| Addis Locksmiths & Property Maintenance Limited | Andover | 2024 |
| Addis Property Group Ltd | Newcastle Upon Tyne | 2025 |
| Addiscombe Estate PL Limited | Croydon | 2019 |
| Addisen Ltd | London | 2022 |
| Addison & Byford Limited | Sudbury | 1977 |
| Addison Bishop Ltd | Shipley | 2006 |
| Addison Building Ltd | Manchester | 2009 |
| Addison Building Projects Limited | London | 2025 |
| Addison Ceramics Ltd | Riddrie | 2012 |
| Addison Construction & Civils Ltd | Bickley | 2018 |
| Addison Construction & Joinery Limited | Caterham | 2020 |
| Addison Construction (Sleaford) Ltd | Sleaford | 2010 |
| Addison Construction Ltd | Essex | 2006 |
| Addison Contractors Limited | Mansfield | 2024 |
| Addison Crescent Construction Limited | London | 2021 |
| Addison Developments (NE) Ltd | Stockton-On-Tees | 2021 |
| Addison Developments Limited | Dorchester | 1997 |
| Addison Elec Contracting Ltd | Lincolnshire | 2019 |
| Addison Electrical (Suffolk) Limited | Woodbridge | 2012 |
| Addison Electrical Contracting Limited | Manchester | 2014 |
| Addison Electrical Services Ltd | Chesterfield | 2019 |
| Addison Enterprises Limited | Ballymena | 2018 |
| Addison Fencing Limited | Clydebank | 2026 |
| Addison Glass & Windscreens Ltd | Guildford | 1975 |
| Addison Langstone Ltd | Darlington | 2026 |
| Addison Plant Limited | Stockton On Tees | 1988 |
| Addison Plumbing Services Ltd | Manchester | 2024 |
| Addison Properties (Halifax) Limited | Halifax | 2015 |
| Addison Scaffolding Ltd | Barnet | 2018 |
| Addison Solar Ltd | London | 2024 |
| Addison Structural Limited | Bromsgrove | 2003 |
| Addison Walker Ltd | Macclesfield | 2013 |
| Addisons Electrical and Security Contracting Ltd | Thirsk | 2020 |
| Addisons Plumbing and Heating Limited | Thirsk | 2026 |
| Addisons Plumbing Ltd | Faversham | 2026 |
| Addition Building Limited | Newport | 2004 |
| Addition Construction Ltd | London | 2012 |
| Addition Interiors Limited | Melton Mowbray | 2019 |
| Addition Steel Ltd | Halstead | 2018 |
| Additional Construction Services Ltd | Manchester | 2013 |
| Additional Spaces Limited | Billericay | 2020 |