Windows & doors in Bromley: Planning Permission Guide
A guide to replacing windows and doors in Bromley — when you need planning permission and typical costs.
Based on 110 decided applications in Bromley over 12 months (96 granted, 14 refused).
Bromley is one of London's largest and greenest boroughs, with substantial Green Belt in the south and east around Biggin Hill, Downe, Orpington rural areas, and parts of the North Downs. Conservation areas include Keston, Chislehurst, Shortlands, Farnborough Village, and Hayes. Listed buildings cluster around Down House (Darwin's home), Chislehurst, and Farnborough. Properties in Green Belt locations face tight restrictions on extension size and outbuilding coverage.
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5 nearest comparables & refusal reasons for your address.
Get my report — £9See a sample →Recent windows & doors decisions in Bromley
The 5 most recent decided applications. Addresses redacted to postcode area.
Non-material amendment application under S96a of the Town and Country Planning Act to planning permission reference 26/00026/HPA to allow…
Proposed 1x Velux window to side roof.
Details submitted to comply with the requirements of the following conditions relating to planning permission 26/00095/HPA: Condition 4 …
Replacement of 5 single glazed timber sash windows with 5 double glazed timber sash windows (3 to the front aspect, 1 to the side aspect …
Replacement of existing single-glazed timber windows with new double-glazed timber windows.
These are borough-wide. See the 5 nearest to your address.
Get my report — £9Permitted 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
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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
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