Basement in Hackney: Planning Permission Guide
What you need to know about basement extensions in Hackney — planning requirements, costs, and professional guidance.
Based on 30 decided applications in Hackney over 12 months (21 granted, 9 refused).
Hackney has numerous conservation areas including Clapton, Stoke Newington, De Beauvoir, London Fields, and Shoreditch. Article 4 Directions are common in Victorian terrace areas, restricting window replacements and front garden paving. Listed buildings cluster around Sutton House and the former town halls. The borough has mixed density — dense inner areas versus more open streets around Hackney Marshes and London Fields.
Personalised odds
5 nearest comparables & refusal reasons for your address.
Get my report — £9See a sample →Recent basement decisions in Hackney
The 5 most recent decided applications. Addresses redacted to postcode area.
Demolition to ground floor level of existing building; erection of building to maximum height of …
Replacement of windows at basement and ground floor from uVPC and timber windows with double glazed timber windows and replace rear…
PLANNING APPLICATION FOR THE CHANGE OF USE OF THE BASEMENT AND GROUND FLOOR OF A COFFEE SHOP (SUIS GENERIS) TO USE CLASS E(A)
Subdivision of property to create 2 no. flats with associated works, including expansion of existing rear infill lightwell, excavation to…
Partial discharge of condition 13 (Energy Systems) of planning permission 2021/0406 (as amended), approved 18/10/2022 for the “Demolition…
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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