Basement in Brighton and Hove: Planning Permission Guide
What you need to know about basement extensions in Brighton and Hove — planning requirements, costs, and professional guidance.
Check if your basement qualifiesBasements in Brighton and Hove at a glance
application fee
weeks typical
Brighton and Hove includes or borders South Downs National Park — properties in or near those areas are on Article 1(5) land where permitted-development rights are restricted. Brighton and Hove has 32 conservation areas — extensive heritage coverage restricting external alterations across many streets. 1,229 listed buildings recorded.
Want your personalised odds?
Approval probability, 5 nearest comparables, refusal reasons — for your specific address.
Recent basement decisions in Brighton and Hove
The 5 most recent decided applications. Addresses redacted to postcode area.
Replacement of existing terracotta floor tiles to front step with new checkerboard tiles, replacement of existing front door, installatio…
New double doors to rear at basement level, revised fenestration, lanscaping and new patio areas to rear garden and internal alterations.
Creation of a new basement and lightwell including insertion of windows at basement level and associated works.
Removal of existing access stair to the front elevation and erection of access stair in new location, landscaping alterations to provide …
Application to vary condition 1 of planning permission BH2024/02026 to permit alterations to design incorporating change to basement loca…
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 South East England
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
Just want a quick yes/no for your basement?
Run our free 2-minute check to see whether your project likely qualifies as permitted development in Brighton and Hove. For personalised approval odds and nearby comparables, get the full report above.
Free 2-min check