| ASHCOUT PROPERTIES | — | — | — | Open → |
| ASHCOUT PROPERTIES | — | — | — | Open → |
| ASHCOUT PROPERTIES | — | — | — | Open → |
| ASHCOUT PROPERTIES LTD | — | — | — | Open → |
| Ashfield District Council | Nottingham | bcadmin@ashfield-dc.gov.uk | 01623 450000 | Open → |
| Ashford Borough Council | Ashford, Kent | building.control@ashford.gov.uk | 01233 330275 | Open → |
| Ashford District Fire Service | Kent | — | 1233 | Open → |
| Ashley & Eileen Hill | Tadcaster | — | — | Open → |
| Ashley Austin | Leeds | — | — | Open → |
| Ashley Timm | York | — | — | Open → |
| Aspire in the Community | Huddersfield | — | — | Open → |
| ASQUITH | — | — | — | Open → |
| Assured Building Contractors Ltd | Leeds | abcltd@sky.com | — | Open → |
| AT Maintenance | Yeadon | — | — | Open → |
| ATKINSON | — | — | — | Open → |
| ATR Properties | Leeds | atrproperties@gmail.com | Aaron ATR: 07850 286337 | Open → |
| ATR Properties | Leeds | — | — | Open → |
| AUSTIN | — | — | — | Open → |
| Avon Fire & Rescue Service | Bristol | — | — | Open → |
| Avril Harris | Leeds | — | 07802453322 | Open → |
| Avril Harrison | Leeds | — | — | Open → |
| AXIS TELECOM LTD | — | — | — | Open → |
| Aylesbury Vale District Council | Aylesbury | — | x | Open → |
| AYLWARD | — | — | — | Open → |
| Aztech Building Maintenance Ltd | Boston Spa | aztechlofts@gmail.com | — | Open → |