| Allied Construction Limited | Northolt | 2025 |
| Allied Construction London Ltd | Hayes | 2013 |
| Allied Construction Services (Scotland) Limited | Glasgow | 1994 |
| Allied Construction Trading Ltd | Morden | 2019 |
| Allied Consult Property Limited | Wembley | 2021 |
| Allied Contracts (Forthside) Ltd | Glasgow | 2016 |
| Allied Contracts (Holms) Ltd | Glasgow | 2016 |
| Allied Decorating Ltd | Peterborough | 2020 |
| Allied Developers Ltd | Oldham | 2019 |
| Allied Development (Holdings) Limited | Kingston Upon Thames | 1973 |
| Allied Development Scotland Limited | Livingston | 2021 |
| Allied Developments (M/Cr) Limited | Preston | 1997 |
| Allied Developments (Northampton) Ltd | Spalding | 2023 |
| Allied Developments Ltd | Fareham | 2004 |
| Allied Electrical Limited | Guildford | 2020 |
| Allied Electrical Recovery Limited | Brackley | 2001 |
| Allied Electrical Services Limited | Bristol | 2015 |
| Allied Electrical Systems Limited | Stoke-On-Trent | 2005 |
| Allied Energy Solutions Ltd | Barking | 2025 |
| Allied Exploration & Geotechnics Limited | Ross-On-Wye | 1987 |
| Allied Facilities Compliance Limited | Hull | 2021 |
| Allied Fire Alarms and Escapes Co Limited | Wrexham Industrial Estate | 1972 |
| Allied Flooring Limited | Alcester | 2018 |
| Allied Glazing & Facades Ltd | Glasgow | 2020 |
| Allied Godwin Developments Limited | London | 1994 |
| Allied Heating Ltd | Goodwick | 2017 |
| Allied Home and DRY Limited | Mansfield | 2018 |
| Allied Industrial Roofing Services Limited | Cradley Heath | 1992 |
| Allied Infrastructure Management Limited | Leigh | 1994 |
| Allied Insulation & Home Improvements Ltd | Newark | 2019 |
| Allied Interiors (Scotland) Ltd | Glasgow | 2013 |
| Allied Lift Services Division (UK) Ltd | St. Helens | 2002 |
| Allied Link Ltd | London | 2010 |
| Allied London Campfield Developments Limited | Manchester | 2018 |
| Allied London Developments Five Limited | Manchester | 2022 |
| Allied London Developments One Limited | Manchester | 2022 |
| Allied London Developments Three Limited | Manchester | 2022 |
| Allied London Developments Two Limited | Manchester | 2022 |
| Allied London Property Investments Limited | Manchester | 1970 |
| Allied London Quay House Developments Limited | Manchester | 2017 |
| Allied Maintainance Ltd | Bedford | 2023 |
| Allied Maintenance Ltd | London | 2026 |
| Allied Maritime Solutions Ltd | London | 2023 |
| Allied Mechanical Services Limited | Histon | 1985 |
| Allied Plant & Landscapes Limited | Newtown | 2006 |
| Allied Property Group Limited | Rochdale | 2020 |
| Allied Property Maintenance Ltd | Peterborough | 2023 |
| Allied Remedial Treatments Limited | Dartford | 1982 |
| Allied Roofing and Construction Limited | Warrington | 1990 |
| Allied Scaffolding Limited | Preston | 1983 |
| Allied Secure Ltd | Barking | 2018 |
| Allied Security (London) Limited | Hackbridge | 1994 |
| Allied Security (Southern) Limited | Epsom | 2012 |
| Allied Site Logistics Ltd | Harlow | 2023 |
| Allied Site Personnel Limited | Cardiff | 2016 |
| Allied Support Ltd | London | 2015 |
| Allied Trade and Investments Ltd | London | 2021 |
| Allied Trade Plumbing and Heating Ltd | Roslin | 2014 |
| Allied Trade Support Limited | Dartford | 2011 |
| Allied Trades. Construction and Demolition Services Ltd | Ramsgate | 2024 |
| Allied Tradesmen Limited | Plymouth | 2011 |
| Allied UK Property Services Ltd | Southampton | 2019 |
| Allied Welsh Limited | Tonyrefail | 1989 |
| Alliedchrome Holdings Ltd | Poole | 2024 |
| Alliedchrome Limited | Poole | 1998 |
| Allies Project Management Limited | Watford | 2019 |
| Allies Property Holdings Limited | Watford | 2019 |
| Alligator Roofing Ltd | West Kilbride | 2026 |
| Allin 1WORK Ltd | Basildon | 2024 |
| ALLIN1 CRB Ltd | London | 2024 |
| Allinc Property Services Ltd | Newbury | 2026 |
| Allinclusive Ltd | London | 2019 |
| Allingas Plumbing & Heating Limited | London | 2018 |
| Allinger CS Ltd | Greenhithe | 2025 |
| Allingham Homes Ltd | Reading | 2010 |
| Allington Building Services Limited | Dorset | 2004 |
| Allington Electrical Ltd | Rayleigh | 2018 |
| Allington Holdings Limited | Limpsfield | 2013 |
| Allington Home Improvements Limited | Canterbury | 1999 |
| Allingtons Plastering Ltd | Brentwood | 2018 |
| Allinone Builders (UK) Ltd | Luton | 2012 |
| Allinone Management Ltd | Sheerness | 2025 |
| Allinone Professional Ltd | Christchurch | 2019 |
| Allinson Hoarding Installation Services Limited | York | 2023 |
| Allinson Industry Ltd | Basildon | 2020 |
| Allinson Plumbing and Heating Limited | Leicester | 2022 |
| Allinsons Consultant Limited | Newcross | 2014 |
| Allison (Longmoor) Development Limited | Peterborough | 2025 |
| Allison Construction Ltd | Ulverston | 2008 |
| Allison Consultants Ltd | Stockton-On-Tees | 2025 |
| Allison Electrical & Aerial Contractors Limited | Appleby-In-Westmorland | 2011 |
| Allison Electrical Contracts Ltd | Carrickmore | 2011 |
| Allison Electrical Limited | Glasgow | 2025 |
| Allison Enterprises Ltd | Perthshire | 2003 |
| Allison Heating and Plumbing Limited | Holt | 1999 |
| Allison Heating Limited | Tyne And Wear | 2002 |
| Allison Homes Developments Limited | Peterborough | 2025 |
| Allison Homes East Midlands Limited | Peterborough | 2024 |
| Allison Homes Limited | Peterborough | 2007 |
| Allison Homes Norfolk and Suffolk Limited | Peterborough | 2015 |