Do I need planning permission to replace windows in Bromley?

For like-for-like replacements in the same material and style, usually not. In conservation areas, changing materials or style may require planning permission. Listed buildings always need consent.

How much does it cost to replace windows?

Window and door replacement in London typically costs between £3,000 and £15,000 depending on the number of windows, material (UPVC, timber, or aluminium), and style.

Do I need Building Regulations for new windows?

Yes. Replacement windows must comply with Building Regulations for thermal performance. FENSA-registered installers can self-certify compliance.

Can I change my windows from timber to UPVC?

In most areas, yes. In conservation areas, the council may require you to keep timber windows. Listed buildings must retain their original window style.

Windows & doors in Bromley: Planning Permission Guide

A guide to replacing windows and doors in Bromley — when you need planning permission and typical costs.

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Windows & doorss in Bromley at a glance

85%

approved

£258

application fee

weeks typical

Based on 115 decided applications in Bromley over 12 months (98 granted, 17 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.

Council planning portal Pre-application advice

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Recent windows & doors decisions in Bromley

The 5 most recent decided applications. Addresses redacted to postcode area.

Refused

Demolition and replacement of the link corridor, and part demolition and replacement of school hall foyer (roof), WC's and stores to the …

BR32026-04-08

Granted

Replacement of two existing timber windows at Flat 3, 16 Wickham Road with new uPVC windows with similar appearance, proportions and conf…

BR32026-04-02

Granted

Non-Material Amendment to previous planning permission ref 25/03823/HPA: Utility Room (00-Z4) window to be retained with frosted glazing…

BR32026-03-31

Refused

Demolition and replacement of the link corridor, and part demolition and replacement of school hall foyer (roof), WC's and stores to the …

BR32026-03-24

Granted

Replacement of existing windows with Reynaers Aluminium SL68 Heritage Slim System casement windows.

BR12026-03-12

These are borough-wide. See the 5 nearest to your address.

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Permitted 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.

Windows & doorsLondon

Typical total

£3,000–£15,000

Typically includes

Windows/doorsInstallationMaking good

Typically excludes

Planning application feeBuilding regs fee

Highly variable depending on number of windows, material (UPVC vs timber vs aluminium), and style. Per-window costs typically £500–£1,500.

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Which 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.

Architect / designerNot needed

This type of project does not typically require architectural services.

Structural engineerNot needed

Party wall surveyorNot needed

Planning consultantNot needed

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.

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Conservation 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.

Conservation areas

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

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.

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Frequently Asked Questions

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