| AIS Building Services Limited | Wirral | 2023 |
| AIS Carpentry Ltd | London | 2025 |
| AIS Construct Ltd | Wellingborough | 2026 |
| AIS Contracts Limited | London | 2017 |
| AIS Elec-Tech Ltd | Southall | 2018 |
| AIS Electrical Limited | Trowbridge | 2025 |
| AIS Estates Ltd | Sheffield | 2024 |
| AIS Inc Limited | Rotherham | 2012 |
| AIS Roofing & Roughcasting Ltd | Newmilns | 2024 |
| AIS Scaffolding Limited | Invergordon | 2017 |
| AIS Services Ltd | Maryburgh | 2023 |
| AIS Site Services Limited | Loughton | 2018 |
| AIS Strategy & Design Limited | London | 2013 |
| AIS Utilities Limited | London | 2019 |
| AIS2 Ltd | Halifax | 2026 |
| Aisby Developments Ltd | Grantham | 2021 |
| Aiscon Ltd | Watford | 2026 |
| Aiseandan Plant Limited | Uxbridge | 2007 |
| Aiser Ltd | Wigan | 2018 |
| Aisgroundworks Ltd | Penrith | 2020 |
| Aisha Traders Ltd | Morden | 2019 |
| Aisist Ltd | Bristol | 2024 |
| Aislet Ltd | Helston | 2000 |
| Aisling Homes Limited | Ipswich | 1996 |
| Aiso Consulting Ltd | Rushden | 2012 |
| Aisone Ltd | Salford | 2023 |
| Aisp Ltd | Benfleet | 2015 |
| Aisso Ltd | Aylesford | 2026 |
| Aiston Plumbing & Heating Limited | Maidstone | 2022 |
| Aiston Property Services Limited | Maidstone | 2022 |
| AIT Builders Ltd | Birmingham | 2025 |
| AIT Buildings Repair Limited | Birmingham | 2019 |
| AIT Construction Services Limited | Belfast | 2014 |
| Aitan Building Services Ltd | Oldbury | 2023 |
| Aitch (Lloyds) Limited | London | 2012 |
| Aitch Acquisitions Limited | London | 1998 |
| Aitch Construction (London) Ltd | London | 2022 |
| Aitch Construction Facades Limited | London | 2026 |
| Aitch Construction Limited | London | 1996 |
| Aitch Consultancy Limited | Chorley | 2025 |
| Aitch Demolition Co. Ltd | Watford | 2001 |
| Aitch Developments Limited | London | 2019 |
| Aitch Estates (Chatham Place) Limited | London | 2011 |
| Aitch Estates Limited | London | 2008 |
| Aitch Group Limited | London | 2011 |
| Aitch Investment Properties Limited | London | 2000 |
| Aitch Shoreditch Limited | London | 2015 |
| Aitch-Electrical Ltd | Shefford | 2023 |
| Aitchill Ltd | London | 2023 |
| Aitchison Construction Limited | Morden | 2022 |
| Aitchison Contracts Ltd | Dumbarton | 2014 |
| Aitchison Development Construction Ltd | Sutton | 2013 |
| Aitchison Electrical Services Ltd | Dalkeith | 2025 |
| Aitchison Ltd | Isle Of Islay | 2010 |
| Aitchison Plumbing & GAS Ltd | Glasgow | 2023 |
| Aitchison Roofing & Joinery Ltd | Melrose | 2026 |
| Aitchisonropeaccess Ltd | Eyemouth | 2026 |
| Aitcho Ltd | Mildenhall | 2026 |
| Aitd Ltd | Dudley | 2026 |
| Aitech Digital Limited | Harrow | 2021 |
| Aiten Ltd | Edinburgh | 2021 |
| Aitken Artisan Plasterwork Limited | Glasgow | 2021 |
| Aitken Construction Ltd | Leicester | 2026 |
| Aitken Developments Limited | Ayr | 1993 |
| Aitken Electrical Contractors Ltd | Northampton | 2014 |
| Aitken Electrical Limited | Longfield | 2025 |
| Aitken Joinery Ltd | Gullane | 2026 |
| Aitken Plumbing and Heating Services Ltd | Glasgow | 2016 |
| Aitken Roofing & Roughcasters Ltd | Irvine | 2024 |
| Aitken Roofing Ltd. | Irvine | 2008 |
| Aitken Ventilation Limited | Glasgow | 2014 |
| Aitken's Joinery Limited | Carlisle | 2015 |
| Aitkin Construction Ltd | Trimdon Station | 2025 |
| Aitkins Interior Specialist Ltd | Portsmouth | 2018 |
| Aitor Survey Ltd | London | 2020 |
| AIU Building Ltd | Greenford | 2022 |
| AIV Contractors Ltd | Harrow | 2026 |
| AIV Engineering Ltd | Harpenden | 2019 |
| Aiva Garden Rooms Limited | South Darenth | 2025 |
| Aivancecontrols Ltd | London | 2026 |
| Aivilo Electrical Ltd | Orpington | 2025 |
| AIW Construction Limited | Gainsborough | 2025 |
| AIW Electrical and Property Services Limited | Walsall | 2026 |
| Aiwa Group Ltd | Southsea | 2015 |
| Aiwu Builder Ltd | Dartford | 2024 |
| AIX Aleph UK Limited | London | 2025 |
| AIX Construction Ltd | Salford | 2025 |
| AIY Renovation Ltd | London | 2026 |
| Aiyep Logistics Limited | West Drayton | 2020 |
| Aiyla Investments Ltd | Cardiff | 2022 |
| Aiyp Ltd | Loughborough | 2025 |
| AIZ Development Limited | Manchester | 2021 |
| AIZ Hadfield Limited | Manchester | 2022 |
| Aizah Property Developments Ltd | London | 2012 |
| Aizlewoods Flooring Specialists Limited | Sheffield | 1979 |
| AJ Miles Ltd | Manchester | 2022 |
| AJ & Co. Construction Ltd | Harlow | 2007 |
| AJ & MK Holdings Limited | Batley | 2015 |
| AJ & RC Plumbing Services Ltd | Manchester | 2024 |
| AJ & SJ Developers Limited | Nottingham | 2014 |