Camden Planning Permission for a Home Extension

Camden and its neighbourhoods

The London Borough of Camden covers many prime residential neighbourhoods, including Hampstead, Belsize Park, Primrose Hill, Highgate (in part) and Bloomsbury. It has a substantial heritage estate, extensive conservation-area coverage and many listed buildings, so home-extension proposals are frequently assessed with care against the borough’s local plan and conservation-area appraisals.

Do you need permission in Camden?

Whether an extension needs planning permission depends on the property. Some houses may have permitted development rights, but these are often restricted in Camden’s conservation areas and by Article 4 directions, and they do not apply to flats and maisonettes. The position should be confirmed for the specific address rather than assumed.

Article 4 directions — heritage, land use and basements

Camden publishes Article 4 directions that remove specified permitted development rights so a planning application is required. Directions are grouped for heritage and conservation, land use, and other development. The basement Article 4 applies borough-wide: basement excavation needs planning permission and is assessed against Local Plan policy A5 and Camden Planning Guidance: Basements.

Heritage Article 4s can control front elevations, windows, boundaries and other works that would otherwise be PD on ordinary houses. Always check Camden’s live Article 4 pages and fact sheets for the address — neighbourhood blogs are not the legal source.

How Camden assesses householder extensions

Camden assesses home extensions against its local plan policies and relevant conservation-area appraisals, considering design quality, the effect on the character of the area, and impacts on neighbours such as daylight, sunlight, outlook and privacy. Well-designed, context-sensitive proposals supported by clear drawings are more likely to be received positively, though approval is never guaranteed.

Our longer guide to what planning officers assess maps validation, character and amenity tests across London; Camden’s conservation density simply raises how often those tests bite.

Basements in Camden — BIA and audit

Where a proposal includes a new or extended basement, Camden requires a detailed technical statement assessing drainage, flooding, groundwater and structural stability within a site-specific Basement Impact Assessment. The council generally requires independent technical audit of BIAs and provides a BIA pro forma and guidance on engineering input. Technical reports should be prepared by suitably qualified chartered engineers or geologists as set out in Camden’s materials.

This is why basement programmes are not “eight weeks like a rear extension”. Engineer design, BIA drafting, audit instruction and revisions sit outside the householder determination clock. See Camden vs RBKC basements and BIA guide.

End-to-end process we run for Camden homeowners

1) Confirm LPA, conservation area, Article 4, listing and planning history. 2) Choose householder application, LDC, prior approval or listed building consent. 3) Survey and design against host character and neighbour sections. 4) Assemble validation-ready drawings and statements. 5) For basements, coordinate BIA and audit path. 6) After decision, discharge conditions, prepare building regulations drawings, and sequence freeholder/party wall tracks.

The Camden planning hub on this site expands that process with official source links. Local money pages such as Hampstead house extensions and Hampstead basements apply it to NW3 stock.

What to prepare for a Camden householder application

A Camden householder application typically needs existing and proposed plans, elevations and sections, site and location plans, and often a design and access or heritage statement for sensitive sites. For sensitive or larger proposals, pre-application advice from Camden can test the principle before a full submission. We prepare the drawings and supporting information and manage the submission.