| 51 0LE Limited | Guildford | 2025 |
| 51 AG Management Limited | London | 2016 |
| 51 Alexandra Road Management Company Limited | Plymouth | 2007 |
| 51 Amberley Road Limited | Plaitford | 2001 |
| 51 and 51A Leslie Park Road Limited | Croydon | 2020 |
| 51 and 53 Balfe Street Limited | London | 2006 |
| 51 and 53 LA Gare Company Limited | London | 2003 |
| 51 Apsley Road Management Company Limited | Bristol | 1991 |
| 51 Arley Hill Management Company Limited | Avon | 2004 |
| 51 Aylesford Street Limited | London | 2010 |
| 51 Barton Road Management Company Limited | Bristol | 2012 |
| 51 Bath Road Management Limited | Worthing | 2012 |
| 51 Belsize Avenue NW3 Freehold Limited | Watford | 2012 |
| 51 Beltran Road Management Limited | London | 2024 |
| 51 Blenheim Crescent (Management) Limited | | 1980 |
| 51 Bradford Street Management Company Ltd | Eastbourne | 2024 |
| 51 Brendon Road (Belmont) Limited | Watchet | 2023 |
| 51 Brunswick Place Limited | Hove | 2015 |
| 51 Brunswick Place RTM Company Ltd | Hove | 2024 |
| 51 Brunswick Square Hove (1996) Limited | Brighton | 1996 |
| 51 Burntwood Lane Management Limited | London | 2002 |
| 51 Cantelupe Road Management Company Limited | Bexhill-On-Sea | 2005 |
| 51 Carneton Close Ltd | Newquay | 2019 |
| 51 Cavendish Road Limited | London | 2003 |
| 51 Chippenham Road RTM Company Limited | Harlow | 2015 |
| 51 Church Road Management Limited | Exeter | 2012 |
| 51 Church Street (Whitby) Limited | Scarborough | 2004 |
| 51 Clanricarde Gardens Limited | Great Sutton | 1999 |
| 51 Cleveland Street Management Company Ltd | London | 2007 |
| 51 Cotham Road Management Company Limited | Bristol | 1991 |
| 51 Cromwell Road Limited | Bristol | 1998 |
| 51 Darnley Road (2019) Limited | London | 2019 |
| 51 DE Parys Avenue Company Limited | Bedford | 1993 |
| 51 Dulwich Road Limited | London | 2002 |
| 51 Ealing Road Wembley Limited | Wembley | 2001 |
| 51 Eardley Crescent Freehold Company Limited | London | 2013 |
| 51 Earls Court Square Freehold Limited | London | 2018 |
| 51 Eaton Place Management Company Limited | Croydon | 1995 |
| 51 Edith Road Limited | London | 2013 |
| 51 ELM Lane RTM Company Ltd | Stevenage | 2023 |
| 51 Endymion Road RTM Company Limited | London | 2016 |
| 51 Ennismore Gardens Management Co., (1981) Limited | Croydon | 1981 |
| 51 Ermine Road Co Ltd. | | 1998 |
| 51 Fairholme Road Limited | London | 2008 |
| 51 Farnham Road Management Limited | Guildford | 2000 |
| 51 Ferme Park Road Ltd | London | 2022 |
| 51 Finborough Road Management Limited | London | 1998 |
| 51 Follett Street RTM Company Limited | Harlow | 2014 |
| 51 Frognal Limited | | 1996 |
| 51 Gascony Avenue Limited | London | 2005 |
| 51 Gilbey Road Property Management Ltd | London | 2025 |
| 51 Gleneagle Road Management Company Limited | London | 2014 |
| 51 Goldney Road (RTM) Company Limited | London | 2012 |
| 51 Granada Road Limited | Portsmouth | 2001 |
| 51 Green Street Limited | London | 2007 |
| 51 Harrington Gardens Management Company Limited | London | 1987 |
| 51 Haven Road Freehold Limited | Fordingbridge | 2017 |
| 51 Headland Park North Hill Limited | Plymouth | 2002 |
| 51 High Street Buntingford Management Company Limited | Hertfordshire | 2006 |
| 51 Highbury Park Residents Co Limited | | 1991 |
| 51 Homersham Road Limited | Kingston Upon Thames | 2015 |
| 51 Kenilworth Road (Cumnor House) Limited | St. Leonards-On-Sea | 2005 |
| 51 Kingsdown Parade Bristol Management Limited | Bristol | 1998 |
| 51 Latitude Management Company Limited | Bridgend | 2016 |
| 51 Lennard Road Freehold Limited | London | 2007 |
| 51 Lewin Road (Freehold) Limited | London | 2025 |
| 51 Limes Grove RTM Company Limited | Salisbury | 2021 |
| 51 Linden Gardens Management Company Limited | | 1991 |
| 51 Long Lane Residents Association Limited | Hatfield | 1996 |
| 51 Lower Bristol Road (Weston-Super-Mare) Management Company Limited | Weston-Super-Mare | 2010 |
| 51 Lowfield Road Limited | | 1999 |
| 51 Lupus Street (Freehold) Limited | London | 2007 |
| 51 Lytton Grove Limited | London | 2020 |
| 51 Maberley Road (London) Freehold Limited | London | 2024 |
| 51 Madoc Street Llandudno Limited | Conwy | 2007 |
| 51 Millers Road (Brighton) Limited | Pulborough | 2015 |
| 51 Montagu Square Limited | London | 2009 |
| 51 Montpelier Road RTM Limited | Brighton | 2005 |
| 51 Morland Road RTM Company Limited | Croydon | 2019 |
| 51 Moss Lane Management Limited | Southall | 2017 |
| 51 Mount Avenue RTM Company Limited | Great Missenden | 2004 |
| 51 Mount Pleasant (Camborne) Management Co Ltd | Camborne | 2018 |
| 51 Nevern Square Residents Limited | London | 1997 |
| 51 New Church Road Limited | Hove | 2016 |
| 51 New King Street (Bath) Management Limited | Bath | 1984 |
| 51 Northfield Avenue Freehold Ltd | London | 2026 |
| 51 Oakfield Road Ltd | Whetstone | 2016 |
| 51 Oakhill Road Putney Management Company Limited | London | 1998 |
| 51 Oakhurst Grove (Freehold) Company Limited | London | 2010 |
| 51 Oakhurst Grove RTM Company Limited | London | 2008 |
| 51 Parade Management Company Limited | Bedford | 2022 |
| 51 Perham Road Limited | London | 2001 |
| 51 Popes Grove Limited | Twickenham | 2003 |
| 51 Poppleton Road Limited | London | 2005 |
| 51 Pulross Road Freehold Limited | London | 2021 |
| 51 Randolph Avenue Limited | Borehamwood | 1982 |
| 51 Ravenswood Road Management Company Limited | Bristol | 2006 |
| 51 Redcliffe Road Limited | Putney Bridge Road | 2003 |
| 51 Redland Road Management Co Ltd | Bristol | 2015 |
| 51 Rita Road RTM Company Limited | Harlow | 2025 |