| Carter Lane Management Company Limited | Bradford | 1996 |
| Carter Property Services (Scotland) Limited | Motherwell | 2023 |
| Carter Services Limited | Chigwell | 2019 |
| Carter Wilson Industrial Ltd | Grimsby | 2011 |
| Carter's Quay Estate Management Company Limited | Ringwood | 2014 |
| Carterhatch Lane Management Co. Ltd | Enfield | 2009 |
| Carterhatch Management Limited | Middlesex | 1991 |
| Carterman Estates Ltd | Doncaster | 2024 |
| Carters Caversham Management Company Reading Limited | Hemel Hempstead | 2024 |
| Carters Court Management Company Ltd | West Malling | 2022 |
| Carters Farm Management Company Limited | Ely | 2017 |
| Carters Grove (Kings Hill) Management Limited | Kingston Upon Thames | 2004 |
| Carterside Management Company Limited | Morpeth | 2015 |
| Carthamon Ltd | Barnet | 2020 |
| Carthian Management Co Limited | Truro | 2003 |
| Cartledge & Sons Limited | Sheffield | 2017 |
| Cartmel Court (Deeping) Management Company Limited | Peterborough | 1986 |
| Cartmel Tower Management Limited | Grange-Over-Sands | 1990 |
| Cartmell Close (Malmesbury) Management Company Limited | Bristol | 2022 |
| Cartmell Court (Lytham ST. Annes) Limited | Lytham St. Annes | 2003 |
| Cartmell Court Management Limited | Bristol | 1986 |
| Cartmell Drive Management Limited | Nottingham | 2017 |
| Cartmell Fold Management Co Limited | Blackpool | 2004 |
| Cartref Homeowners Limited | Taunton | 2013 |
| Cartref House Management Company Limited | Northwood | 1985 |
| Cartref RTM Company Limited | Chichester | 2004 |
| Cartrefle Apartments Management Company Limited | Hoddesdon | 2012 |
| Cartwright Gardens Management Company Limited | Huddersfield | 1992 |
| Caruana Properties Ltd | Newport | 2025 |
| Caruthers & Stein Limited | London | 2020 |
| Carvel Court Management Company Limited | East Cowes | 1989 |
| Carver Close Residents Property Management Company Limited | London | 2006 |
| Carver Properties Limited | Dundee | 2024 |
| Carvers Croft Management Limited | Knebworth | 2005 |
| Carvic Investments Limited | London | 2021 |
| Carvill Property Ltd | Leeds | 2021 |
| Carville Properties Limited | Luton | 2021 |
| Carwent Limited | Seaford | 2001 |
| Carwithen Close (Management Company) Limited | Aylesbury | 2021 |
| Cary Grange Management Company Ltd | Torquay | 2001 |
| Cary Park Management Company Limited | Torquay | 2006 |
| Carylls Meadow Residents Limited | Horsham | 2012 |
| Carysfort Close Management Limited | Peterborough | 2003 |
| Carysfort Lodge Management Limited | Bournemouth | 2006 |
| CAS MAC Ltd | London | 2025 |
| Casa (Bournemouth Road) Limited | Poole | 2018 |
| Casa DI Amore Flat Management Limited | Bristol | 2006 |
| Casa Express Ltd | Manchester | 2025 |
| Casa Fresco Cleaning Services Ltd | Maidenhead | 2015 |
| Casa Gladstone Limited | London | 2021 |
| Casa Green Limited | Tarporley | 1982 |
| Casa Group Bristol Ltd Ltd | Paulton | 2026 |
| Casa Guidi Freehold Limited | Bournemouth | 2018 |
| Casa Marina Apartments Freehold Limited | Torquay | 2019 |
| Casa Severino Limited | London | 2020 |
| Casa Zanna Ltd | Towcester | 2021 |
| CASA365PROPERTY Ltd | London | 2021 |
| Casalavoro Property Management Ltd | Ebbsfleet Valley, | 2025 |
| Casaluxe Estates Ltd | Milton Keynes | 2024 |
| Casamand Ltd | Hornchurch | 2017 |
| Casanova Investments Limited | Weymouth | 2011 |
| Casara Holdings Ltd | Deal | 2021 |
| Casbar Limited | Brighton | 1982 |
| Casbrook Fields (Michelmersh) Management Company Limited | Birmingham | 2009 |
| Cascade Court (Bedale) Residents Management Company Limited | Leyburn | 1998 |
| Cascade Management Limited | | 1995 |
| Cascades (Forestdale) Freehold Limited | London | 2000 |
| Cascades (Kenley) Management Limited | Croydon | 2006 |
| Cascades Court Limited | New Malden | 2005 |
| Cascades Management Limited | London | 1971 |
| Cascadia House Residents Management Company Limited | Epsom | 2004 |
| Cascourt Manco Limited | Bournemouth | 2006 |
| Casebridge Property Management Company Limited | London | 1996 |
| Caseconnect Limited | Westbury On Trym | 2025 |
| Caselli Smith Ltd | Crowthorne | 2017 |
| Casemount Property Development Ltd | London | 2026 |
| Caseridge Limited | Cheadle | 1978 |
| Casewick Road Freehold Ltd | London | 2015 |
| Casewick Road Management Company Limited | London | 2018 |
| Casey Partners Ltd | Melton Mowbray | 2019 |
| Casey Properties Limited | Sowerby Bridge | 2003 |
| Cashel Court Management Company Limited | Macclesfield | 2004 |
| Cashelton Manor Limited | Belfast | 2016 |
| Cashman Properties Ltd | Caerphilly | 2024 |
| Cashtale Limited | Penryn | 1991 |
| Casita Property Management Company Limited | Chester | 2023 |
| Casita Verde Property Management Ltd | Lincoln | 2026 |
| Casnewydd Property Limited | Worcester | 2024 |
| Casper Property Limited | Gainsborough | 2018 |
| Caspian Court Freehold Limited | Haywards Heath | 2025 |
| Caspian View Management Company Limited | Cuffley | 2021 |
| Cass Property Solutions Ltd | Cardiff | 2025 |
| Cassard House Management Company Limited | Torquay | 1987 |
| Cassea Court (Bridport) Management Company Limited | Dorchester | 1989 |
| Cassea Court Management Company Limited | Dorchester | 1980 |
| Cassia Gardens Management Company Limited | Winsford | 2001 |
| Cassies Lane Management Company Limited | Ballyclare | 2018 |
| Cassini Management Company Limited | Reading | 2009 |
| Cassio Gardens Limited | Watford | 1971 |
| Cassio Metro Management Company Limited | Leighton Buzzard | 2003 |