| North Warwickshire Borough Council | Atherstone, Warwickshire | — | 01827 715341 | Open → |
| North West Leicestershire District Council | Coalville, Leicestershire | building.control@nwleicestershire.gov.uk | 01530 454545 | Open → |
| North Yorkshire Building Control | YORK | enquiries@nybcp.org | x | Open → |
| North Yorkshire Building Control Partnership | Easingwold | — | — | Open → |
| North Yorkshire Building Control Partnership | Easingwold | — | — | Open → |
| North Yorkshire Construction | Selby | andy.nyconstruction@gmail.com | — | Open → |
| North Yorkshire Fire & Rescue Service | Northallerton | electronicconsultation@northyorksfire.gov.uk | — | Open → |
| Northampton Borough Council | Northampton | — | 01604 233500 | Open → |
| Northamptonshire Fire and Rescue Service | Northampton | — | — | Open → |
| Northmead Developments Ltd | York | — | — | Open → |
| Northumberland County Council | Hexham | buildingcontrol@northumberland.gov.uk | — | Open → |
| Northumberland Fire & Rescue Service | Northumberland | — | 01670 513161 | Open → |
| Northumbrian Water | Durham | — | 0845 717 1100 | Open → |
| NotKnown | — | — | — | Open → |
| Nottingham City Council | Nottingham | building.control@nottinghamcity.gov.uk | 0115 915 5357 | Open → |
| Nottingham Fire & Rescue Service | Nottingham | fireprotection@notts-fire.gov.uk | 0115 9575260 | Open → |
| Nottingham Fire and Rescue Service | Arnold | — | 0115 967 0155 | Open → |
| Nottinghamshire Fire and Rescue Service | Nottingham | fireprotectionnorth@notts-fire.gov.uk | 0115 967 0880 | Open → |
| NR &MRS BARKER | — | — | — | Open → |
| Nuneaton & Bedworth Borough Council | Nuneaton, Warwickshire | building.control@nuneatonandbedworth.gov.uk | 02476 376376 | Open → |
| O'Neills Associates | York | — | — | Open → |
| Oadby & Wigston Borough Council | Leicester | — | 0116 2888961 | Open → |
| ODELL | — | — | — | Open → |
| OGDEN | — | — | — | Open → |
| OHANLON | — | — | — | Open → |