| 12 Compton Terrace Limited | London | 2016 |
| 12 CPR Ltd | Bournemouth | 2020 |
| 12 Cwrt Y Parc Management Company Limited | Cardiff | 2016 |
| 12 Daleham Gardens (N.W.3.) Limited | London | 1997 |
| 12 Dean Road Freehold Limited | Willesden Green | 2024 |
| 12 Doors Limited | Bournemouth | 2022 |
| 12 Eaton Place Freeholders Limited | East Sussex | 1998 |
| 12 Edith Terrace Limited | London | 2004 |
| 12 Egerton Gardens Freehold Limited | Petworth | 2014 |
| 12 ELM Grove Limited | London | 2019 |
| 12 ELM Road Freehold Limited | Sidcup | 2017 |
| 12 Ferndale Limited | London | 2015 |
| 12 Freeland Limited | Woodford Green | 2023 |
| 12 Gloucester Terrace Ltd | London | 2025 |
| 12 Godman Road Limited | London | 2008 |
| 12 Golden Manor Management Limited | Salisbury | 2021 |
| 12 Goldhurst Terrace (Freehold) Ltd | Watford | 2006 |
| 12 Gore Terrace Ltd | Longfield | 2023 |
| 12 Grand Parade Management Company Ltd | Plymouth | 2010 |
| 12 Grange Park (London) RTM Company Limited | Bromley | 2021 |
| 12 Greenman Ltd | Telford | 2026 |
| 12 Grosvenor Road Management Company Limited | Southend-On-Sea | 2012 |
| 12 Guildford Road Tunbridge Wells Limited | Tunbridge Wells | 2004 |
| 12 Hanbury Road RTM Company Limited | Bristol | 2004 |
| 12 Hanover Street Limited | Liverpool | 2021 |
| 12 HAY Hill Ltd. | London | 2014 |
| 12 Heath Road Ltd | London | 2020 |
| 12 Hemel Hempstead Limited | Stanmore | 2014 |
| 12 Herbert Road Ltd | London | 2019 |
| 12 Hill Road (Management) Limited | Clevedon | 2003 |
| 12 Hill Street Property Management Limited | Richmond | 2026 |
| 12 Hilltop Road Limited | | 1994 |
| 12 Hollycroft Avenue Freehold Limited | London | 2010 |
| 12 Homes Ltd | Newport | 2025 |
| 12 Hornton Street Limited | London | 2006 |
| 12 Horspath Road Limited | Waterlooville | 2016 |
| 12 Houses Ltd | Warrington | 2019 |
| 12 Howley Place Management Company Limited | Ilford | 1994 |
| 12 Hyde Park Limited | London | 2004 |
| 12 Ivanhoe Management Ltd | Liverpool | 2025 |
| 12 Jasper Ltd | Didsbury | 2022 |
| 12 John Clyne Ltd | London | 2022 |
| 12 Keys Property Investment Consortium Limited | Bolton | 2026 |
| 12 Kildare Gardens Limited | London | 1999 |
| 12 Kingdon Road Ltd | Brighton | 2021 |
| 12 Kings Avenue (Management) Limited | London | 1987 |
| 12 L.R. (Management) Limited | London | 1995 |
| 12 Lanhill Road Ltd | London | 2023 |
| 12 Lauderdale Parade and 62 Castellain Road Limited | London | 2019 |
| 12 Leinster Gardens Ltd | Bradford | 2017 |
| 12 Lisgar Terrace Freehold Limited | London | 2014 |
| 12 Lound Side Limited | Wembley | 2021 |
| 12 Lushington Limited | Eastbourne | 2025 |
| 12 Lushington Road Ltd | Redhill | 2025 |
| 12 Lyndhurst Gardens Management Limited | | 2002 |
| 12 Lynmouth Street Tenants Company Limited | Lynmouth | 2004 |
| 12 Macs Close Limited | London | 2017 |
| 12 Margravine Gardens London Limited | London | 2001 |
| 12 Marlborough Buildings Limited | Avon | 1999 |
| 12 Marlborough Street Bath (Management) Company Limited | Bath | 1994 |
| 12 Medley Road (Management) Limited | Hull | 2009 |
| 12 Mill Lane RTM Limited | London | 2012 |
| 12 Milton Road Freehold Company Limited | London | 2006 |
| 12 Milton Road Ltd | | 1996 |
| 12 Montagu Square Ltd | London | 2004 |
| 12 Montpelier Terrace Management Company (Ilfracombe) Limited | Romford | 2005 |
| 12 Moorgate Tenant Limited | London | 2018 |
| 12 Moorview Land Limited | Plymouth | 2024 |
| 12 Mortlake Road Limited | Croydon | 2004 |
| 12 NB Limited | Banbury | 2015 |
| 12 Netherton Grove Limited | London | 2020 |
| 12 New Street Limited | Knutsford | 2019 |
| 12 Nibthwaite Road Management Limited | London | 2021 |
| 12 North Parade Management Co Ltd | Norwich | 2005 |
| 12 Northbrook Road Ltd | London | 2025 |
| 12 Northgate Hunstanton Limited | Kettering | 2013 |
| 12 Northumberland Place (Teignmouth) Limited | Teignmouth | 2024 |
| 12 Norwood Street Ltd | Ashford | 2024 |
| 12 Ospringe Road (London) Limited | London | 2001 |
| 12 Oxford Avenue Limited | Carnforth | 2016 |
| 12 O’Clock Management Ltd | Sheffield | 2023 |
| 12 Pembridge Square Management Company Limited | London | 1999 |
| 12 Perham Road Management Limited | | 2002 |
| 12 Piercefield Place Ltd | Cardiff | 2015 |
| 12 Poole Hill Freehold Limited | Poole | 2021 |
| 12 Porchester Square Ltd | London | 2023 |
| 12 Posting House Limited | Stockport | 2017 |
| 12 Powderham Crescent Limited | Tiverton | 2025 |
| 12 Property Ltd | Norwich | 2018 |
| 12 Property Management Limited | Bolton | 2022 |
| 12 Queen's Gardens Management Limited | Stevenage | 1991 |
| 12 Queen's Parade Management Company Limited | Saffron Walden | 1995 |
| 12 Queensberry Place Limited | London | 2005 |
| 12 Raddington Road Limited | Kensington | 2017 |
| 12 Raleigh Road Limited | Bristol | 2013 |
| 12 Regents CT Ltd | Manchester | 2021 |
| 12 Renfield Street Limited | Glasgow | 2013 |
| 12 Rivers Limited | London | 2020 |
| 12 RR Ltd | London | 2024 |
| 12 Sackville Road Residents Association Ltd. | Tunbridge Wells | 1995 |