Basement Planning in Camden vs RBKC

Same city, different basement machines

Basements in prime London are rarely “dig and see”. Camden and RBKC both require planning permission for basement excavation via Article 4 directions, and both demand serious technical evidence — but the emphasis differs. Camden’s published process centres on Local Plan policy A5, Camden Planning Guidance: Basements, and independent audit of Basement Impact Assessments. RBKC’s long-standing framework restricts garden extent and storey depth and is supported by the Basements SPD (April 2016) on construction impacts.

This guide compares the homeowner-facing process. It is not a substitute for reading the adopted policies for your application date.

Article 4 — permission is required in both

Camden’s borough-wide basement Article 4 means basement excavations need planning permission and are assessed against basement policy rather than assumed as permitted development. RBKC’s borough-wide basement Article 4 came into force on 28 April 2016 with the same practical effect: plan for a planning application.

If someone sells you a “PD basement” in either borough without checking live designations, treat that as a red flag.

Camden: BIA + independent audit culture

Camden’s basement pages state that proposals need a detailed technical statement assessing drainage, flooding, groundwater and structural stability — contained in a site-specific Basement Impact Assessment. The council generally requires independent technical audit of BIAs and provides a BIA pro forma and guidance on the scope of engineering input.

Local Plan policy A5 places specific restrictions on scale and impact. The ARUP geological, hydrogeological and hydrological study is referenced in Camden’s basement materials as background to what must be assessed. Programme time for engineer design, BIA drafting, audit instruction and any revisions — this is why Camden basements are not “eight weeks and dig”.

See Basement Impact Assessment in London and our Hampstead basements page for local process notes.

RBKC: envelope limits + construction impact SPD

RBKC’s basement policy approach has restricted basements to limited garden coverage and storey depth — commonly described under the CL7-era framework as single storey and not more than 50% of each garden or open part of the site, with limited exceptions on large sites in successive Local Plan wording. Always confirm the current Local Plan basement policy (including any renumbering such as later CD policies) for your application.

The Basements SPD (April 2016) guides how construction impacts are managed and how regimes interact. Party walls, structural design, hydrology and neighbour amenity sit at the centre of assessment. Double basements and large garden undercrofts face a high bar.

Local money pages such as Kensington basements and Chelsea basements apply these tests to stock and streets.

Shared practical sequence for owners

1) Confirm Article 4, CA and listing. 2) Test a policy-compliant envelope before interior design. 3) Commission ground investigation and structural input early. 4) Prepare planning drawings and technical evidence as one coordinated case. 5) Programme party wall and construction management. 6) After permission, complete building regulations drawings and discharge conditions before start.

Fees: design fees are fixed and staged in our packages; council fees, engineer fees, audit fees (Camden) and party wall costs sit outside unless agreed. Never confuse statutory fees with professional fees or build cost.

What “acceptable” usually means (cautiously)

Acceptable basement proposals tend to: respect published scale limits; prove structural and groundwater impacts with competent evidence; manage construction impact on neighbours; and present lightwells and external manifestations that do not harm character. Unacceptable proposals often reverse that order — maximum dig first, evidence later.

We will not invent approval rates for either borough. What we can do is refuse to design an envelope that ignores published policy before you spend on detailed interiors.