| Constancia Court (Folkestone) Limited | Folkestone | 2007 |
| Constant Property Limited | London | 2019 |
| Constantine Court (Hillingdon) Management Company Limited | Uxbridge | 1999 |
| Constantine Court (Middlesbrough) RTM Company Limited | Darlington | 2008 |
| Constantine House (Hayes) RTM Company Limited | Hayes | 2025 |
| Constantine House (York) Management Company Limited | York | 2002 |
| Constantine Road (NO. 66) Management Co. Ltd. | | 1989 |
| Constitution Hill Management Company Limited | Bromley | 2004 |
| Construct Concepts Ltd | London | 2023 |
| Consul Court Management Company Limited | Portsmouth | 2000 |
| Consulate Bramhall Limited | Manchester | 2016 |
| Consulate Green (Bramhall) Management Company Limited | Altrincham | 2020 |
| Consultants ARK Ltd | London | 2012 |
| Consultiam Property Limited | London | 2003 |
| Consulting One Ltd | Nantwich | 2024 |
| Consumer Dispute Resolution Limited | Milton Keynes | 2014 |
| Contempora International Ltd | Holborn | 2016 |
| Contemporary Living Estates Ltd | London | 2025 |
| Contemporis RTM Company Limited | Bristol | 2009 |
| Contento Properties Ltd | Winsford | 2026 |
| Context (High Wycombe) Management Company Limited | New Milton | 2007 |
| Contin Holdings Limited | Rochester | 2021 |
| Contra Management Company (Clifton) Limited | Cambridge | 2004 |
| Contractor Relocations Ltd | Birmingham | 2019 |
| Contractorcompany Ltd | Luton | 2021 |
| Controlaspect Property Management Limited | Salisbury | 1996 |
| Controlformal Property Management Limited | Camberley | 1997 |
| Controlgood Property Management Limited | London | 1997 |
| Controlright Property Management Limited | Deeside | 1999 |
| Controltake Property Management Limited | Croydon | 1997 |
| Conudra Ltd | Scarborough | 2019 |
| Convent Court Management Limited | Waterlooville | 1992 |
| Convent Gardens Management Company Limited | Bromborough | 2002 |
| Convent Mews Residents Management Company Limited | New Malden | 2012 |
| Convery Property Services Limited | Prescot | 2026 |
| Convivia Developments Limited | Skipton | 2010 |
| Conway & Young Ltd | London | 2023 |
| Conway Court (Berry Hill) Management Company Limited | Coleford | 1990 |
| Conway Court (Cardiff) Management Limited | Cardiff | 2008 |
| Conway Court (Exeter) Management Company Limited | Torquay | 1966 |
| Conway Court (Hoghton) Management Company Limited | Preston | 2006 |
| Conway Court (New Milton) Management Limited | New Milton | 1969 |
| Conway Court (Paignton) Management Limited | Torquay | 1988 |
| Conway Court (Southend on Sea) Management Company Limited | Rayleigh | 2009 |
| Conway Court Residents Limited | Reading | 1989 |
| Conway Court Residents' Association Company Limited | Gillingham | 2004 |
| Conway Hall Management Company Limited | Gillingham | 1994 |
| Conway House (Rothbury) Management Limited | Morpeth | 2003 |
| Conway Lettings Limited | Carnforth | 2017 |
| Conway Mews Management Company Limited | Cardiff | 2014 |
| Conway Road (Management) Limited | Falmouth | 1983 |
| Conwell Developments Management Company Limited | Bangor | 2004 |
| Conwy Garth Management Company Limited | Colwyn Bay | 1980 |
| Conwy Terrace Management Limited | Colwyn Bay | 2005 |
| Conybeare Heights RMC Ltd | Cardiff | 2024 |
| Conyer Quay (Management) Limited | Hythe | 2001 |
| Conyers (Thrupps Lane) Residents Association Limited | Walton-On-Thames | 1976 |
| Conyers Place (Residents) Management Limited | Bury St. Edmunds | 1994 |
| Conygre House Management Company Limited | Bristol | 2018 |
| Cooden Court Resident's Association Limited | Bexhill-On-Sea | 1969 |
| Cooden Heights RTM Company Limited | Bexhill-On-Sea | 2011 |
| Coogan Limited | | 1997 |
| Cook Homes Hull Limited | Hull | 2023 |
| Cooke-Zaska Ltd | London | 2022 |
| Cookers Corner Management Company Limited | Hitchin | 2022 |
| Cookes Meadow (Northwich) Management Company Limited | Croydon | 2015 |
| Cookes Meadow Management Company Limited | Bedford | 2019 |
| Cookes Quay Management Company Limited | Bridgwater | 1995 |
| Cookham Dene (Bexhill) Limited | Bexhill-On-Sea | 2005 |
| Cookham House (Dunston Riverside) Management Limited | Gateshead | 2002 |
| Cookridge Street Investments Holdings Limited | Glasgow | 2022 |
| Cookridge Street Investments Limited | Glasgow | 2022 |
| Cooks (Southwark) Management Company Limited | London | 1982 |
| Cooks Court Management Company Ltd | Castle Cary | 2022 |
| Cooks Living Spaces Ltd | Fordingbridge | 2025 |
| Cooks PIT Management Company Limited | Nantwich | 2021 |
| Cooksey Gardens Property Limited | Martley | 2017 |
| Cooksholme Management Company Limited | Dudley | 2023 |
| Cool Mint Property Ltd | Ammanford | 2024 |
| Cool Oak Management Co. Limited | London | 1987 |
| Cool Quest Ltd | Northampton | 2024 |
| Cool Rock Property Management Ltd | Thatcham | 2026 |
| Cool View Management Company Ltd | Hove | 2010 |
| Coolbergen Management Limited | Brentwood | 2021 |
| Cooley Property NI Ltd | Coleraine | 2025 |
| Coolgreen Property Management Company Limited | London | 1992 |
| Coolhurst Close Management Company Limited | Dorking | 2018 |
| Coolhurst Limited | London | 2002 |
| Coolhurst Property Management Limited | Horsham | 1995 |
| Coolmaghery View Management Company Ltd | Limavady | 2024 |
| Coolmillish Management (N.I.) Limited | Newry | 2016 |
| Coolmillish Management Limited | Newry | 2003 |
| Coolnacran Management Company Limited | Gilford | 2018 |
| Coolnagard Hollow Management Company Ltd | Omagh | 2006 |
| Coolreaghs Manor Management Ltd | Coleraine | 2020 |
| Coolview (Brighton & Hove) Ltd | Hove | 2008 |
| Coombe Avenue (Sevenoaks) Company Limited | Kenley | 1994 |
| Coombe Court (Beckenham) Freehold Limited | Tonbridge | 2006 |
| Coombe Court (Beckenham) Management Limited | Tonbridge | 1977 |
| Coombe Court Tadworth Limited | Leatherhead | 2004 |