| South Gloucestershire Council | Kingswood, Bristol | building.control@southglos.gov.uk | 1454863450 | Open → |
| South Holland District Council | Lincolnshire | bcadmin@sholland.gov.uk | — | Open → |
| South Kesteven District Council | Grantham, Lincolnshire | bcontrol@southkesteven.gov.uk | 01476 406080 | Open → |
| South Lakeside District Council | Kendal | — | 01539 733333 | Open → |
| South Northamptonsire | Towcester | — | 01327 322240 | Open → |
| South Oxfordshire District Council | Wallingford, Oxon | building.control@southandvale.gov.uk | — | Open → |
| South Ribble Borough Council | Leyland, Lancashire | bldcontrol@southribble.gov.uk | 01772 421491 | Open → |
| South Somerset District Council | Yeovil, Somerset | building.control@southsomerset.gov.uk | 01935 462462 | Open → |
| South Tyneside Metropolitan Borough Council | South Shields | — | 0191 427 1717 | Open → |
| South Tyneside Metropolitan Borough Council | South Shields | — | — | Open → |
| South Wales Fire & Rescue Service | Llantrisant | swfs@southwales-fire.gov.uk | 01443 232000 | Open → |
| South West Water | Exeter, Devon | developerservicesassetprotection@southwestwater.co.uk | 0344 346 2020 | Open → |
| South Yorkshire Fire & Rescue Service | South Yorkshire | — | 01226 282222 | Open → |
| South Yorkshire Fire & Rescue Service | Sheffield | — | 0114 272 7202 | Open → |
| South Yorkshire Fire & Rescue Service | Barnsley | — | — | Open → |
| Southampton City Council | Southampton | building.control@southampton.gov.uk | 02380 832781 | Open → |
| Southend-on-Sea Borough Council | Southend-on-Sea, Essex | — | 01702 215339 | Open → |
| Southern Water | Otterbourne | developerservices@southernwater.co.uk | 0330 303 0119 option 5 | Open → |
| Southstone Project Management | Leeds | — | — | Open → |
| Southwark | — | — | — | Open → |
| Southwark Council | London | — | x | Open → |
| SPACKMAN | — | — | — | Open → |
| Spatial Concepts Leeds Ltd | Leeds | sclleeds@gmail.com | — | Open → |
| Specialist Trailer Hire Ltd | Leeds | — | — | Open → |
| Spelthorne Borough Council | Staines | building.control@spelthorne.gov.uk | 01784 451499 | Open → |