| Allerton Glass & Glazing (NW) Ltd | Liverpool | 2020 |
| Allerton Glass and Glazing Limited | Liverpool | 2016 |
| Allerton Plant & Ground Works Services Ltd | Wednesbury | 2022 |
| Allerton Properties Limited | Ripon | 2007 |
| Allerton Property Services Ltd | Liverpool | 2024 |
| Allerton Structural Contractors Limited | Liverpool | 1992 |
| Allesley Grove Management Company Ltd | Leamington Spa | 2024 |
| Allesley Properties Limited | Coventry | 2011 |
| Alleston Electrical Ltd | Leicester | 2025 |
| Allestree B&L Ltd | Derby | 2023 |
| Allestree Groundworks Limited | Derby | 2008 |
| Allestree Property Developers Ltd | Derby | 2019 |
| Allestree Window Services Limited | Derbyshire | 2002 |
| Allet Scaffolding and Hire Limited | Rayleigh | 2019 |
| Allevo Construction Ltd | Hinckley | 2023 |
| Allexton Homes Ltd | Loughborough | 2025 |
| Alleyand Co UK Ltd | Croydon | 2019 |
| Alleyford Limited | Taunton | 2000 |
| Alleygates Ltd | London | 2011 |
| Alleyhaus Ltd | Solihull | 2022 |
| Alleyn Road 102 Limited | London | 2013 |
| Alleyne Facias Ltd | Coventry | 2025 |
| Alleyne Roofing Ltd | Coventry | 2020 |
| Allez Limited | Tunbridge Wells | 1999 |
| Allfal Limited | Alloa | 2009 |
| Allfarthing Ltd | Thatcham | 2023 |
| Allfields Contractors Ltd | Brentwood | 2013 |
| Allfine Roofing Ltd | Horsham | 2025 |
| Allfire and Security Ltd | Oldham | 2024 |
| Allfit Limited | Glasgow | 1991 |
| Allfit Upvc Installations Limited | Newport | 2021 |
| Allfix Roofing and Building Ltd | Dartford | 2022 |
| Allfixroofingandguttering Ltd | Wallington | 2026 |
| Allflip Limited | Birmingham | 2025 |
| Allfloors Contracts Ltd | Upminster | 2005 |
| Allfloors Dorset Limited | Weymouth | 2021 |
| Allfloors London Ltd | Enfield | 2018 |
| Allfloors Trade Center Limited | Aylesford | 2019 |
| Allflow Connections Ltd | Chatham | 2025 |
| Allforone Roofing Ltd | Whitley Bay | 2025 |
| Allforproperty Limited | Halesowen | 2019 |
| Allgas 1 Limited | Rotherham | 2010 |
| Allgas Heating Services Ltd | Romford | 2006 |
| Allgas LDN Limited | Waltham Cross | 2022 |
| Allgas North West Limited | Liverpool | 2019 |
| Allgas Plumbing & Heating Limited | Huddersfield | 2008 |
| Allgas South West Ltd | Saltash | 2009 |
| Allgas UK Ltd | Sutton | 2003 |
| Allgate Services Ltd | Liverpool | 2025 |
| Allgates Automation Systems Limited | Basingstoke | 2012 |
| Allglass & Glazing Limited | Yeovil | 1990 |
| Allglass (Anglia) Limited | Woodbridge | 1991 |
| Allglass (West London) Limited | Middlesex | 2003 |
| Allglass Cornwall Limited | Helston | 2014 |
| Allglaze (NW) Limited | Bootle | 2013 |
| Allglaze Dorset Ltd | Bournemouth | 2009 |
| Allglaze Limited | Liverpool | 2012 |
| Allglaze Property Limited | Liverpool | 2013 |
| Allgo Construction Limited | Harrow | 2024 |
| Allgo Construction Services Ltd | Berkhamsted | 2020 |
| Allgo Electrical Ltd | Portrack Lane | 2023 |
| Allgold Limited | London | 1996 |
| Allgood Building Services Ltd | Ely | 2024 |
| Allgood Carpentry Limited | Dartford | 2018 |
| Allgood Construction (NW) Ltd | Manchester | 2023 |
| Allgood Construction Limited | London | 2017 |
| Allgood GHP Ltd | Heywood | 2023 |
| Allgood Property Developments Limited | Ely | 2021 |
| Allgood Services Ltd. | Peterborough | 2001 |
| Allgreen Contracting Limited | Worcester | 2003 |
| Allgroup Services Limited | Farnham | 2022 |
| Allguard Alarms Limited | Manchester | 1989 |
| Allguard Roofing Services Ltd | London | 2025 |
| Allhands Limited | Plymouth | 1979 |
| Allhaver Limited | Workington | 2013 |
| Allheat & Plumbing Limited | Benfleet | 2022 |
| Allhouse Management Ltd | London | 2025 |
| Alliam Limited | East Sussex | 2016 |
| Alliance Garage Doors Limited | Newton Abbot | 2008 |
| Alliance 2000 Limited | St Albans | 1991 |
| Alliance Asbestos Services Limited | Cambridge | 2008 |
| Alliance Build Company Limited | Torquay | 2014 |
| Alliance Building & Landscapes Ltd | Hornchurch | 2019 |
| Alliance Building Company Contracts Ltd | Folkestone | 2013 |
| Alliance Building Services Ltd | Gerrards Cross | 2005 |
| Alliance CFM Limited | Reading | 2020 |
| Alliance Chiro Ltd | London | 2016 |
| Alliance Community Partnership Limited | Bellshill | 2012 |
| Alliance Concrete Structures Ltd | Falkirk | 2024 |
| Alliance Construction Group Ltd | Wigan | 2024 |
| Alliance Construction Limited | Edinburgh | 2017 |
| Alliance Construction Services Limited | Walsall | 2017 |
| Alliance Construction Solutions Ltd | Liverpool | 2026 |
| Alliance Contractors (ENG) Ltd | Walsall | 2017 |
| Alliance Cooling Services West Midlands Ltd | Lichfield | 2023 |
| Alliance Crewing Services Ltd | London | 2022 |
| Alliance Decor Ltd | Dartford | 2010 |
| Alliance Design and Build Ltd | Leigh On Sea | 2015 |
| Alliance Design and Construction Limited | Windsor | 2023 |
| Alliance Design UK Ltd | Manchester | 2005 |