Windows & doors in Brent: Planning Permission Guide
A guide to replacing windows and doors in Brent — when you need planning permission and typical costs.
Based on 33 decided applications in Brent over 12 months (28 granted, 5 refused).
Brent has conservation areas around Wembley Park, Sudbury Court, Kensal Green, and Queen's Park. Article 4 Directions restrict specific rights in some conservation areas. Listed buildings cluster around Wembley and around historic Kensal Green Cemetery. The borough has a mix of Victorian terraces in the south and inter-war semis in the north. Kensal Green Cemetery and its surroundings have specific heritage considerations.
Recent windows & doors decisions in Brent
The 5 most recent decided applications. Addresses redacted to postcode area.
Proposed replacement of existing timber sash single-glazed windows with double-glazed timber sash windows to front and rear elevations of…
Proposed conversion of existing first and second floor flat into 2x self-contained flats, installation of 1x first floor side facing wind…
Proposed replacement of windows to the front elevation and replacement of front door to the bungalow.
Proposed replacement of existing windows with new double glazed uPVC casement windows, replacement of front door with new double glazed t…
Replacement of 4x existing front elevation windows with double glazed timber vertical sliding sash windows and replacement of 3x existing…
These are borough-wide. See the 5 nearest to your address.
Check your address freePermitted Development Rules
Replacing or adding windows/doors may need planning permission in conservation areas or for listed buildings.
Replacing windows and doors like-for-like generally doesn't need planning permission. However, in conservation areas or listed buildings, changes to the appearance of windows and doors may require consent.
Typical Costs in London
Window and door costs depend on the number of openings, material choice, and style.
Typical total
Typically includes
Typically excludes
Highly variable depending on number of windows, material (UPVC vs timber vs aluminium), and style. Per-window costs typically £500–£1,500.
Get a personalised cost estimate based on your actual windows & doors dimensions.
Get my estimateWhich Professionals Do You Need?
Window replacements rarely need professional services. Suppliers typically handle measurement, manufacture, and installation.
This project is unlikely to need specialist professional services beyond a competent builder.
This type of project does not typically require architectural services.
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 windows & doors.
Get personalised guidanceConservation Areas & Listed Buildings
In conservation areas, changing window materials (e.g. timber to UPVC) or styles may need planning permission. Listed buildings always need Listed Building Consent for any window or door changes.
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 windows & doors?
Run our free 2-minute check to see whether your project likely qualifies as permitted development in Brent — your address, your constraints, your council's own recent decisions.
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