| 4 Crosses Construction Limited | Menai Bridge | 2004 |
| 4 D Installations Limited | Solihull | 2014 |
| 4 Degrees Plumbing Ltd | Plymouth | 2017 |
| 4 Downing Street Limited | Farnham | 2025 |
| 4 Electrical Northern Limited | Romsey | 2025 |
| 4 Electrical Services (UK) Ltd | Romsey | 2017 |
| 4 Engineering Limited | Wotton-Under-Edge | 2014 |
| 4 Eton Mews Ltd | Diss | 2023 |
| 4 Ever Glazing (UK) Ltd | Southall | 2002 |
| 4 Fantastic Ltd | Harlow | 2018 |
| 4 Floor Fitting Ltd | Peterborough | 2023 |
| 4 Flooring Limited | Romford | 2009 |
| 4 Front Construction Limited | Romford | 2008 |
| 4 Front Interiors Limited | Blisworth | 2007 |
| 4 Front Ltd. | Billericay | 2003 |
| 4 GEN Plastering Ltd | Rotherham | 2025 |
| 4 Gutter Cleaning Ltd | Brentford | 2009 |
| 4 G’S Concepts Ltd | London | 2025 |
| 4 Heat Limited | Kings Lynn | 2012 |
| 4 Heatons Limited | Stockport | 2012 |
| 4 Heps Property Services Ltd | London | 2025 |
| 4 Kings Security Limited | Surrey | 2001 |
| 4 Life Construction Limited | Sutton | 2014 |
| 4 Lifts Ltd | Swanscombe | 2018 |
| 4 Longwalk SPV2 Limited | Pinner | 2025 |
| 4 Love of Design, Ltd | Ruislip | 2020 |
| 4 Malvern Grove Limited | Hyde | 2013 |
| 4 Mark Construction (London) Limited | Harrow | 2005 |
| 4 Mark Construction Limited | Harrow | 2025 |
| 4 Martlett Court Limited | Coventry | 2019 |
| 4 Mation Construction Limited | Southend On Sea | 1997 |
| 4 Mech Limited | Basildon | 2019 |
| 4 Oaks Group Ltd | Shenstone | 2015 |
| 4 Pillars Construction Ltd | Gloucester | 2014 |
| 4 Pinfold Lane Ltd | Hawarden | 2018 |
| 4 Plan Limited | Manchester | 1999 |
| 4 Play Developments Limited | Thame | 2009 |
| 4 Point Projects Ltd | Northampton | 2025 |
| 4 Point Property Ltd | London | 2024 |
| 4 Points Property Development Limited | Stevenage | 2015 |
| 4 Power Engineering Ltd | London | 2012 |
| 4 Property Ltd | Doncaster | 2017 |
| 4 Property Maintenance Ltd | Burntwood | 2025 |
| 4 Rail Limited | Kenilworth | 2017 |
| 4 Real Developments Limited | Wigan | 2012 |
| 4 Safety Systems Ltd | Wickford | 2023 |
| 4 Scaffold Ltd | Wickford | 2019 |
| 4 Season Roofing Limited | Cobham | 2018 |
| 4 Seasons Air Conditioning Limited | Exmouth | 2008 |
| 4 Seasons Cheshire Home Solutions Ltd | Crewe | 2026 |
| 4 Seasons Cheshire Ltd | Congleton | 2024 |
| 4 Seasons Comfort Hvac Ltd | London | 2023 |
| 4 Seasons Doors Ltd | Edinburgh | 2021 |
| 4 Seasons Full Installation Devision Ltd | Wigan | 2019 |
| 4 Seasons GAS Limited | Sheffield | 2025 |
| 4 Seasons Roofing and Maintenance Ltd | Croydon | 2025 |
| 4 Sides Construction Ltd | Milton Keynes | 2020 |
| 4 Site Electrical Limited | London | 2002 |
| 4 Site Electrical Services Limited | Biggleswade | 2018 |
| 4 Site Homes (SE) Limited | Wadhurst | 2002 |
| 4 Site Piling Limited | Billericay | 2017 |
| 4 Site Plumbing Limited | Tiptree | 1995 |
| 4 Smart Properties Ltd | Nottingham | 2020 |
| 4 Smart Services Ltd | Worksop | 2011 |
| 4 Space Limited | Whitfield | 2019 |
| 4 Square Capital UK Limited | London | 2018 |
| 4 Square Services Limited | Bromley | 2014 |
| 4 Squares Developments (London) Ltd | London | 2020 |
| 4 Star Roofing & Maintenance Limited | Newton Abbot | 2012 |
| 4 Steps Renovation Ltd | Coventry | 2025 |
| 4 Summit Architectural Limited | Croydon | 2016 |
| 4 Summit Ltd | Croydon | 2005 |
| 4 Sure Installations Limited | Cardiff | 2015 |
| 4 Sure Services Ltd | Croydon | 2020 |
| 4 Sydney Place Management Company Limited | Bath | 2006 |
| 4 Tech Solutions Limited | Ashtead | 2007 |
| 4 Technical Services Ltd | Totnes | 2021 |
| 4 Tile Limited | Doncaster | 1996 |
| 4 to 300 Brickwork Ltd | Oldham | 2020 |
| 4 U Designs Limited | Preston | 2010 |
| 4 U Food & Wine Ltd | Northolt | 2015 |
| 4 UK Specialists Ltd | Romford | 2013 |
| 4 Valleyfield Road Limited | London | 2016 |
| 4 Wall Improvements Ltd | Edinburgh | 2023 |
| 4 Walls Developments Ltd | Leicester | 2012 |
| 4 Way Builders Limited | King'S Lynn | 2017 |
| 4 Way Construction Limited | Swindon | 2015 |
| 4 Way Electrical Limited | King'S Lynn | 2012 |
| 4 Ways U.K. Ltd | Smethwick | 2023 |
| 4 Woods Carpentry and Construction Limited | Ystradgynlais | 2020 |
| 4 YOU Developments Ltd | London | 2018 |
| 4 YOU Electricals Services Ltd | London | 2025 |
| 4 YOU Floors Ltd | Ockendon | 2017 |
| 4&J Construction Ltd | Barnet | 2022 |
| 4-6 ST Edmunds Terrace Developer Limited | London | 2014 |
| 4-6 ST Edmunds Terrace Limited | London | 2014 |
| 4-ELEVEN (International) Limited | Hexham | 2014 |
| 4-SITE Power & Fibre Networks Ltd | Gosport | 2019 |
| 4-SITE TM Ltd | Gosport | 2019 |
| 4-WHEELS Express Delivery Ltd | Crawley | 2018 |