| Adderstone Management Limited | Newcastle Upon Tyne | 2021 |
| Adderstone Mansion Management Co Limited | Bolton | 1998 |
| Addex Hommes Ltd | Dundee | 2025 |
| Addex Properties Ltd | London | 2025 |
| Addey & Garrett Ltd | Southall | 2022 |
| Addfern Residents Association Limited | Bruton | 1984 |
| Addframe Limited | London | 2008 |
| Addg Properties Limited | Armagh | 2021 |
| Addgreen Properties Limited | London | 2021 |
| Addhomes Ltd | Newark | 2014 |
| Addian Ltd | Troon | 2017 |
| Addibok Property Limited | London | 2013 |
| Addicted to Better Ltd | Blackpool | 2023 |
| Addictive Properties Limited | Bedford | 2019 |
| Addicus Property Ltd | Witney | 2017 |
| Addiewell Rentals Ltd | Inverness | 2024 |
| Addingfield Limited | Abergavenny | 1965 |
| Addingford Investments Ltd | Wakefield | 2026 |
| Addingham Developments Limited | Normanton | 2005 |
| Addington Business Park Ltd | London | 2025 |
| Addington Estates Limited | Milton Keynes | 2005 |
| Addington Gore Property Rentals Limited | Margate | 2022 |
| Addington Investments Ltd. | Nether Kellet | 2018 |
| Addington Leisure Limited | Ashford | 2022 |
| Addington Palace Events Limited | London | 2003 |
| Addington Properties Limited | Frome | 1996 |
| Addington-Leavesden Limited | Crowthorne | 2024 |
| Addis & Whiteman Limited | Abergavenny | 2020 |
| Addis Estates Ltd | Croydon | 2023 |
| Addis Properties Limited | Caerphilly | 2024 |
| Addis Property Developers Ltd | London | 2026 |
| Addis Property Holdings Ltd | Sunderland | 2020 |
| Addis Property Lettings Ltd. | Coleford | 2024 |
| Addis Property Ltd | London | 2019 |
| Addis Services Ltd | Yeovil | 2025 |
| Addis-Air Ltd | London | 2024 |
| Addiscombe Estates Limited | London | 2024 |
| Addiscombe Property Limited | London | 2024 |
| Addiscombe Treehouse Limited | Dartford | 2017 |
| Addison & Co Property Limited | Dundee | 2026 |
| Addison Alfie Limited | Slough | 2020 |
| Addison Coates Limited | Otley | 2026 |
| Addison Crescent Nominee Limited | London | 2022 |
| Addison Developments Four Limited | Dorchester | 2016 |
| Addison Developments Three Limited | Dorchester | 2011 |
| Addison Estate Agents Limited | Southampton | 2024 |
| Addison Estates Limited | Hoddesdon | 1969 |
| Addison Garden Ltd | London | 2026 |
| Addison Giles Limited | Brentford | 2013 |
| Addison Group (NW) Ltd | Liverpool | 2025 |
| Addison Grove Limited | London | 2023 |
| Addison Grove Management Limited | Woking | 1994 |
| Addison Homes Ltd | Edinburgh | 2019 |
| Addison Investment Ltd | London | 2024 |
| Addison Lewis Property Group Ltd | Altrincham | 2022 |
| Addison Lloyd Limited | Sheffield | 2023 |
| Addison London Limited | Hitchin | 1988 |
| Addison Management Services Limited | London | 2019 |
| Addison Nest Properties Ltd | Hamilton | 2023 |
| Addison Partners Limited | London | 2024 |
| Addison Properties Limited | London | 1973 |
| Addison Properties NE Ltd | Middlesbrough | 2023 |
| Addison Property Company Limited | London | 2014 |
| Addison RD RL Ltd | Windsor | 2023 |
| Addison Reed Properties Limited | Lanark | 2021 |
| Addison Residential Limited | London | 2019 |
| Addison Security Limited | Grays | 2007 |
| Addison Thomas Limited | London | 2022 |
| Addison's Limited | York | 1983 |
| Addisons Estate and Letting Agent Limited | Wigan | 2017 |
| Addisons Investments Limited | Torquay | 2004 |
| Addisons Property Limited | Northolt | 2019 |
| Addisrentalpoole Ltd | Poole | 2025 |
| Addistech Limited | Milton Keynes | 2015 |
| Addistone Investments Limited | Rotherham | 2023 |
| Addition (Southwark) Limited | London | 2009 |
| Addition Investments Limited | Harrow | 2025 |
| Addition Land Limited | London | 2007 |
| Additional Needs Housing Limited | Chester | 2017 |
| Additive Housing Ltd | Chester | 2021 |
| Addkip Limited | Paisley | 1987 |
| Addl (UK) Limited | London | 2005 |
| Addlan Properties Limited | Llandudno | 2024 |
| Addlemoor Properties Limited | London | 2006 |
| Addlestone Beaconsfield Limited | Preston | 2025 |
| Addlestone Estates Limited | West Byfleet | 2024 |
| Addlestone Gerrards Cross Limited | Preston | 2025 |
| Addlestone Investments Limited | London | 2026 |
| Addlhome Property Management Limited | Bromley | 2025 |
| Addlink Investments Limited | Heathfield | 2000 |
| Addmar Limited | Glasgow | 2014 |
| Addmore Properties Holdings Ltd | Hayes | 2018 |
| Addmore Properties Ltd. | London | 2017 |
| Addo Equity Limited | London | 2014 |
| Addo-Budu Ltd | London | 2024 |
| Addoc Properties Ltd | Bedford | 2021 |
| Addom Ltd | Croydon | 2022 |
| Addp Partners Limited | London | 2013 |
| Addpace Limited | Bristol | 1997 |
| Addpad Limited | Bournemouth | 2022 |