Windows & doors in Barnet: Planning Permission Guide
A guide to replacing windows and doors in Barnet — when you need planning permission and typical costs.
Based on 42 decided applications in Barnet over 12 months (35 granted, 7 refused).
Barnet has over 15 conservation areas including Hampstead Garden Suburb — a unique 1907 planned community with its own Trust exercising very strict design controls alongside council powers. Other notable conservation areas include Totteridge Village, Mill Hill, and Monken Hadley. The northern fringe borders substantial Green Belt around Totteridge and Arkley. Article 4 Directions cover parts of Hampstead Garden Suburb and other heritage streets.
Recent windows & doors decisions in Barnet
The 5 most recent decided applications. Addresses redacted to postcode area.
Replacement of existing first floor windows to match existing
Shopfront alterations including the replacement of the stall riser, entrance doors and fascia
Changes to fenestration including new rear sliding doors, blocking of side door and new first floor rear balustrade. New rear terrace wi…
Installation of new windows and doors to the rear elevation at ground floor level
Replacement of 3no. existing single-glazed painted timber casement windows with 3no. new double-glazed painted timber casement windows. R…
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 Barnet — your address, your constraints, your council's own recent decisions.
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