| Macclesfield Borough Council | Macclesfield | — | 01624 500500 | Open → |
| MACK & LAWLER BUILDERS LTD | — | — | — | Open → |
| Mack & Lawler Builders Ltd | York | — | — | Open → |
| MACKANALL
MCINALL | — | — | — | Open → |
| MACKINDER FARMS | — | — | — | Open → |
| Maggie Barrett | Leeds | — | — | Open → |
| Mahalia Long | — | mail@imaginehomes.co.uk | — | Open → |
| Maidstone Borough Council | Maidstone | building@maidstone.gov.uk | — | Open → |
| Maidstone Group Fire Safety Office | Maidstone | — | — | Open → |
| MAINI KUMAR | — | — | — | Open → |
| MAJID IHSAN | — | — | — | Open → |
| MAJIT MALIK | — | — | — | Open → |
| Malcolm Clark | Brough | malc_cl@hotmail.co.uk | — | Open → |
| Malisa Playe | Selby | melissaplaye@hotmail.co.uk | — | Open → |
| Malt Developments (Laura Thompson) | Bradford | — | — | Open → |
| MALT Property Developments Ltd | Baildon | malt-developments@hotmail.com | — | Open → |
| Malvern Hills District Council | Malvern | mail@southworcestershirebuildingcontrol.gov.uk | 01684 892700 | Open → |
| Manchester Central Fire Station | Manchester | — | 0161 608 5347/5303 | Open → |
| Manchester City Council | Manchester | building.control@manchester.gov.uk | x | Open → |
| Mandy & Anthony Raspin | Goole | raspinm@hotmail.co.uk | — | Open → |
| MANDY DRAKE | — | — | — | Open → |
| Mandy Kaiser | Hull | — | — | Open → |
| MANDY TOOLAN | — | — | — | Open → |
| Manisha Bhambra | Leeds | — | — | Open → |
| Mansfield District Council | Mansfield, Notts | — | 01623 463463 | Open → |