| Alex & Aleks Ltd | Leeds | 2016 |
| Alex & Co. Property Care Ltd | Barnet | 2025 |
| Alex & Darius Ltd | Gravesend | 2026 |
| Alex & Deaconu Ltd | London | 2015 |
| Alex & Denisa's Constructions World Ltd | Cardiff | 2017 |
| Alex & Evgeni Ltd | London | 2021 |
| Alex & John Ltd | Harlow | 2023 |
| Alex & Mary Ltd | Grays | 2014 |
| Alex & Paulina Construction Ltd | Stevenage | 2024 |
| Alex & RAD Construction Ltd | London | 2015 |
| Alex & Sons Building Landscaping and Gardening Services Ltd | Chinnor | 2025 |
| Alex 2009 Ltd | London | 2015 |
| Alex 25 Limited | Harrow | 2025 |
| Alex 74 Ltd | London | 2020 |
| Alex 80 Ltd | London | 2019 |
| Alex 9 Builders Ltd | Hounslow | 2025 |
| Alex Access Scaffolding Ltd | London | 2017 |
| Alex Acozmei Ltd | London | 2020 |
| Alex Adam & SON Limited | West Kilbride | 2014 |
| Alex Alex Limited | Peterborough | 2015 |
| Alex Andrews Plumbing and Heating Ltd | Didcot | 2018 |
| Alex Anthony Construction Ltd | Sutton | 2017 |
| Alex Art Decor Ltd | London | 2021 |
| Alex Arthurs Building Services Limited | Cambridge | 2016 |
| Alex Austin Flooring Ltd | Darlington | 2023 |
| Alex Barry Construction & Developments Ltd | Pontypool | 2026 |
| Alex Bratan Ltd | Gloucester | 2018 |
| Alex Brewster Electrical Ltd | Stirling | 2020 |
| Alex Brewster Limited | Stirling | 2010 |
| Alex Brickwork Ltd | Leighton Buzzard | 2017 |
| Alex Brown Electrical Services Ltd | Westbury | 2019 |
| Alex Brown Groundworks Limited | Norwich | 2017 |
| Alex Bruce Roofing Ltd | Glasgow | 2016 |
| Alex Build 4U Ltd | Barnet | 2024 |
| Alex Build Ltd | London | 2018 |
| Alex Builder 72 Limited | Dunstable | 2022 |
| Alex Builder Ltd | Blackburn | 2025 |
| Alex Builders (London) Limited | Croydon | 2021 |
| Alex Buildforce Ltd | Milton Keynes | 2026 |
| Alex Building & Decorating Services Limited | London | 2018 |
| Alex Building Limited | Thornton Heath | 2017 |
| Alex Building Services (UK) Limited | Romford | 2008 |
| Alex Building Services Ltd | Edgware | 2014 |
| Alex Burges Plumbing & Heating Ltd | Seaton | 2014 |
| Alex Burns Roofing Limited | Banstead | 2019 |
| Alex Burridge Electrical Limited | Bristol | 2017 |
| Alex C. Electrical Ltd | Northampton | 2023 |
| Alex Canova Ltd | Croydon | 2025 |
| Alex Carp Mechanical Engineering Ltd | Dagenham | 2015 |
| Alex Carpentry Ltd | Wellingborough | 2016 |
| Alex Civil Engineering Consultancy Limited | London | 2025 |
| Alex Clarke & Sons Ltd | Liverpool | 2014 |
| Alex Class Ltd | Grays | 2020 |
| Alex Cleaning 2021 Ltd | London | 2021 |
| Alex Clipston Ltd | Stamford | 2024 |
| Alex Collier Electricity Distribution Ltd | Nottingham | 2025 |
| Alex Concept Limited | Cardiff | 2015 |
| Alex Construction & Maintenance Limited | Wigston | 2018 |
| Alex Construction (Cheshire) Limited | Stockport | 2017 |
| Alex Construction Group Limited | London | 2025 |
| Alex Construction Limited | Corby | 2017 |
| Alex Construction Services Ltd | Sutton | 2019 |
| Alex Construction Tech Ltd | London | 2023 |
| Alex Contracting Ltd | London | 2016 |
| Alex Cooper Group Ltd | Ilford | 2025 |
| Alex Cullen Plumbing and Tiling Limited | Knowle, Solihull | 2019 |
| Alex DA Silva Ltd | London | 2025 |
| Alex David Ltd | Peterborough | 2018 |
| Alex Davies Construction Ltd | St. Asaph | 1994 |
| Alex Deco Design Limited | Watford | 2015 |
| Alex Derevon Ltd | Driffield | 2025 |
| Alex Design Painting Ltd | Walton-On-Thames | 2024 |
| Alex Development Ltd | Waltham Cross | 2019 |
| Alex Dewhurst Construction Limited | Preston | 2022 |
| Alex Dobson Windows and Doors Ltd | Knaphill | 2016 |
| Alex Donici Ltd | Stanmore | 2014 |
| Alex Dosaru Construction Ltd | Mitcham | 2023 |
| Alex Dowell Electrical Services Ltd | Alloa | 2018 |
| Alex Drylining Ltd | Ilford | 2025 |
| Alex Dunn Electrical Limited | Leicester | 2023 |
| Alex Dury & Co Limited | Winchelsea | 2022 |
| Alex Eco Builders Ltd | Salford | 2018 |
| Alex Electrical Leicester Ltd | Wigston | 2022 |
| Alex Electrical Ltd | London | 2018 |
| Alex Elite Groundworks Ltd | Borehamwood | 2025 |
| Alex Engineering Limited | Didcot | 2010 |
| Alex Engineering Services Ltd | Wakefield | 2019 |
| Alex England Decorators Ltd | Newport | 2018 |
| Alex Evan Heating and Plumbing Limited | Liverpool | 2022 |
| Alex Fairbrother Builders Ltd. | Melton Mowbray | 2003 |
| Alex Ferguson Building Limited | Glasgow | 2012 |
| Alex Fernandes Ltd | Hayes | 2023 |
| Alex Fire and Security Limited | Burton-On-Trent | 2019 |
| Alex Fire Ltd | Luton | 2025 |
| Alex Fire Protection Ltd | Ilford | 2025 |
| Alex Fitting Limited | Batley | 2022 |
| Alex FIX 21 Limited | London | 2021 |
| Alex Fixing Ltd | Croydon | 2016 |
| Alex Flooring Ltd | Gerrards Cross | 2023 |
| Alex Flower Electrical Ltd | Bristol | 2024 |