Basement in Camden: Planning Permission Guide
What you need to know about basement extensions in Camden — planning requirements, costs, and professional guidance.
Based on 148 decided applications in Camden over 12 months (144 granted, 4 refused).
Camden has over 40 conservation areas including Hampstead, Belsize Park, Bloomsbury, Fitzrovia, and Regent's Park. Listed building density is high, particularly in Bloomsbury and around Regent's Park. Article 4 Directions are widespread, restricting window replacements, front door changes, and satellite dishes in many conservation areas. The council's design guidance is notably detailed and strictly enforced.
Personalised odds
5 nearest comparables & refusal reasons for your address.
Get my report — £9See a sample →Recent basement decisions in Camden
The 5 most recent decided applications. Addresses redacted to postcode area.
Details of wheelchair user accommodation required by condition 18 of planning permission 2020/5473/P granted by appeal 26/04/2023 (as ame…
Details of Privacy measures for Units 11 and 12's 2nd floor rear windows on the Southeast Elevation, required by condition 18 of planning…
Details of building design to partially re-discharge parts A, B, C, D and E of Condition 11 of planning permission 2022/1515/P dated 20/0…
Details pursuant to Condition 3 (Material Details) of planning permission ref. 2023/1275/P (dated 07/06/2023) for: Creation of front ligh…
Non-material amendment to planning permission ref. 2025/4677/P dated 5/12/2025 for 'Change of use of the ground floor and basement of Blo…
These are borough-wide. See the 5 nearest to your address.
Get my report — £9Permitted Development Rules
Basement excavation requires a full planning application.
Basement excavation does not have permitted development rights under Part 1 of the GPDO. A full planning application is always required.
Typical Costs in London
Basements are among the most expensive home improvement projects. Costs vary enormously depending on depth, ground conditions, and access.
Cost per m²
construction rate
Typical total
Based on 25–50 m²
Typically includes
Typically excludes
Basement projects are complex and costs vary enormously depending on depth, ground conditions, waterproofing, and access. Professional advice is essential.
Get a personalised cost estimate based on your actual basement dimensions.
Get my estimateWhich Professionals Do You Need?
Basement projects are complex and always require specialist professional input — an architect, structural engineer, and usually a party wall surveyor.
You'll need an architect, a structural engineer, and a party wall surveyor for this project.
Basement projects are complex and require specialist architectural and structural design.
Typical fee: £5,000–£15,000 (Full architectural service)
Basement excavation requires detailed structural engineering for underpinning, retaining walls, and waterproofing.
Typical fee: £2,000–£5,000
Basement excavation almost always triggers the Party Wall Act due to work near neighbouring foundations.
Typical fee: £700–£1,500 (per neighbour)
This guidance is based on a typical semi-detached house with no special constraints. Listed buildings, conservation areas, and attached properties may require additional professional input.
Find out exactly which professionals you need for your basement.
Get personalised guidanceConservation Areas & Listed Buildings
In conservation areas, basement applications receive additional scrutiny. The council will consider the impact on neighbouring properties and the character of the area.
Properties in conservation areas often have reduced permitted development rights. Some project types (like side extensions) lose PD rights entirely. An Article 4 Direction can remove additional PD rights.
Listed buildings (Grade I, II*, or II) have no permitted development rights at all. Any external alteration requires Listed Building Consent in addition to any planning permission. An architect experienced in heritage work is essential.
Check if your property is in a conservation area or has other planning constraints.
Check my propertyFrequently Asked Questions
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