| 4QX Limited | Hartlepool | 2013 |
| 4R Building Limited | Hassocks | 2007 |
| 4R Construction Ltd | Solihull | 2021 |
| 4REAL Properties Limited | Wigan | 2018 |
| 4RUNNER Limited | Bristol | 2000 |
| 4S Builders Ltd | Coventry | 2024 |
| 4S Construction Limited | Northwood | 2005 |
| 4S Electrical Solutions Ltd | London | 2024 |
| 4S Gbpm Ltd | London | 2024 |
| 4S Open Services Ltd | Leyburn | 2021 |
| 4S Ventures Limited | Blackburn | 2019 |
| 4SECURITY Ltd | London | 2025 |
| 4SHARE Developments Ltd | Bristol | 2024 |
| 4SHIRES Commercial Maintenance Limited | Banbury | 2024 |
| 4SHUTTERS Ltd | Sunbury | 2020 |
| 4SIBLINGS Limited | Bedford | 2015 |
| 4SIGHT Construction Ltd | Bournemouth | 2017 |
| 4SIGHT Maintenance Services Ltd | Glasgow | 2000 |
| 4SITE Ceramics Limited | Colchester | 2019 |
| 4SITE Construction & Refurbishment Ltd. | Cardiff | 2017 |
| 4SITE Engineering and Construction Ltd | Milnthorpe | 2008 |
| 4SITE Logistics Limited | Fareham | 2025 |
| 4SLC Trading Ltd | Sheffield | 2020 |
| 4SOLAR Ltd | Knutsford | 2024 |
| 4SOLUTIONS Limited | Wakefield | 2018 |
| 4SP Basements Ltd | Billericay | 2022 |
| 4SP Build Ltd | Billericay | 2017 |
| 4SP Holdings Ltd | Billericay | 2012 |
| 4SQFT Limited | Esher | 2023 |
| 4SUMFITOUT Ltd | Nottingham | 2018 |
| 4SURE Home Solutions Ltd | London | 2026 |
| 4SYTE Network Limited | Telford | 2022 |
| 4T Building Services Ltd | Gillingham | 2026 |
| 4T Properties Ltd | Ossett | 2021 |
| 4T8 Property Maintenance Ltd | Tonbridge | 2012 |
| 4TB Ltd | Liphook | 2020 |
| 4TEC Haulage Ltd | Huddersfield | 2023 |
| 4TH Avenue Investment Limited | Ickenham | 2020 |
| 4TH DNA Limited | Buckley | 2019 |
| 4TH GEN Plumbing Limited | Spalding | 2021 |
| 4TH Generation - Flat Roofing Services Ltd | London | 2019 |
| 4TH Generation Bournemouth Ltd | Bournemouth | 2016 |
| 4TH Wall Construction Ltd | Blanefield | 2024 |
| 4THGEN Decorating Limited | London | 2024 |
| 4THQVILLE Investment Ltd | Manchester | 2024 |
| 4TRADESMEN Ltd | Fawkham | 2020 |
| 4TRONIC Ltd. | London | 2014 |
| 4U Builders Ltd | Coventry | 2025 |
| 4U Construction Group Ltd | London | 2025 |
| 4U Joinery Limited | Pathhead | 2004 |
| 4U Security Ltd | Bolton | 2022 |
| 4UK TM Limited | Doncaster | 2017 |
| 4UNIMATE Boilers and Bathrooms Limited | London | 2025 |
| 4URBAN (Harrogate) Limited | Harrogate | 2009 |
| 4USELECTRIC Ltd | London | 2019 |
| 4VENTURES Development Company Ltd | Preston | 2021 |
| 4W Building Services Limited | Colchester | 2017 |
| 4WALLS Developers Ltd | Hoddesdon | 2024 |
| 4WALLS Project Management Limited | Andover | 2016 |
| 4WALLSYORK Ltd | York | 2019 |
| 4WARD Maintenance Ltd | Bromsgrove | 2023 |
| 4WARD Property Developments Ltd | Lydney | 2012 |
| 4WB Construction Ltd | Hornchurch | 2021 |
| 4WRIGHT Construction Limited | Peterlee | 2024 |
| 4YBCE Limited | London | 2026 |
| 4YOU Ltd | London | 2014 |
| 4YOURHOUSE Limited | London | 2015 |
| 4YOURTENDERLIST Ltd | North Shields | 2018 |
| 4YOUXPRO Limited | Sheffield | 2024 |
| 5 AMP Limited | Maidstone | 2019 |
| 5 ASH Plastering Limited | Gravesend | 2006 |
| 5 Brothers Construction Ltd | Blackpool | 2018 |
| 5 Crossways Limited | South Croydon | 2016 |
| 5 Crowns GAS & Plumbing Services Ltd | Birmingham | 2020 |
| 5 D Property Services Limited | Flitwick | 2016 |
| 5 D S Restoration Limited | Stratford | 2022 |
| 5 Doughty Street Limited | Bristol | 2022 |
| 5 Edward Street Ltd | Swansea | 2019 |
| 5 Electrical Engineering Ltd | London | 2023 |
| 5 Hanover Square GP Limited | London | 2007 |
| 5 Hartington Road Management Limited | Knowsley | 2006 |
| 5 Jays Building Services Limited | Birkenhead | 2018 |
| 5 Lawn Road Development Ltd | London | 2022 |
| 5 Merchant Square (General Partner) Limited | London | 2006 |
| 5 Merchant Square (Nominee) Limited | London | 2006 |
| 5 Nines Construction Ltd | London | 2019 |
| 5 O'Clock Somewhere Limited | Loughborough | 2023 |
| 5 Point Group Limited | Christchurch | 2023 |
| 5 Property Maintenance Ltd | Manchester | 2021 |
| 5 R Facades Ltd | Illford | 2022 |
| 5 Raynham Limited | London | 2016 |
| 5 Rich Joinery Ltd | London | 2024 |
| 5 Rise Roofing & Guttering Ltd | Keighley | 2026 |
| 5 Rivers Windows & Doors Ltd | Northolt | 2024 |
| 5 Squared Property Limited | Southampton | 2022 |
| 5 Star AR Builders Ltd | Bradford | 2023 |
| 5 Star Bricklaying Limited | Cardiff | 2017 |
| 5 Star Build Ltd | London | 2018 |
| 5 Star Builders Services Ltd | Birmingham | 2021 |
| 5 Star Building Ltd | Braintree | 2019 |