Guide
Do you need planning permission for new windows?
Houses, flats, conservation areas, Article 4 directions, listed buildings and leaseholds.
Replacing windows on a house in England is usually permitted development if the new windows look similar to the old ones. You need permission if your home is a flat or maisonette, if an Article 4 direction removes the rights, or if the work changes the appearance substantially; listed buildings always need listed building consent.
Houses
In England, like-for-like replacement windows on a house are permitted development. Upper-floor windows on a side wall must be obscure glazed and either fixed or opening only above 1.7 m from the floor.
Flats and maisonettes
Householder permitted development rights do not apply to flats and maisonettes in England, so a change of style, material or colour can need planning permission. In England, Wales and Northern Ireland leaseholders usually also need the freeholder’s written consent; in Scotland, check the title deeds and any factor. See triple glazing for flats.
Conservation areas and Article 4 directions
Many conservation areas allow like-for-like replacements on houses, but councils can remove permitted development rights with an Article 4 direction, often for windows on front elevations. Check your council’s conservation area map before ordering.
Listed buildings
Replacing windows in a listed building needs listed building consent, and original windows are often expected to be repaired rather than replaced. Secondary glazing is the usual way to add insulation. Doing the work without consent is a criminal offence.
Wales, Scotland and Northern Ireland
In Wales, householder rules exclude flats and councils use Article 4 directions too. In Scotland, permitted development for replacement windows was widened in May 2024, including in many conservation areas, with front elevations expected to match the existing closely; flats outside conservation areas generally need permission only if the opening size changes. In Northern Ireland, check with your council planning office. Listed buildings need consent everywhere.
Questions
Do I need planning permission for triple glazing?
Not usually on a house, if the windows look similar. Flats, Article 4 areas and listed buildings are the exceptions.
Can I change the colour of my windows?
On a house outside an Article 4 area, usually yes. In flats, conservation areas with Article 4 directions, and listed buildings, check first.
Sources
- Planning Portal: doors and windows
- Welsh Government: householder permitted development
- North Ayrshire Council: windows advice note (Scotland, 2024 changes)
More guides
- Is triple glazing worth it?
- Triple vs double glazing: the real differences
- Triple glazing cost guide (October 2026)
- U-values and Window Energy Ratings explained
- Building Regulations for replacement windows: England, Wales, Scotland and Northern Ireland
- Triple glazing and condensation
- Does triple glazing reduce noise?
- Can you put triple glazing in existing frames?
- Triple glazing in period homes and conservation areas
- Trickle vents and ventilation when replacing windows
- Window security: locks, laminated glass and PAS 24
- Windows for Passivhaus and EnerPHit projects
- uPVC vs aluminium vs timber vs alu-clad: choosing a frame
- Triple glazing and solar gain: which way do your windows face?
- What happens when your triple glazing is installed
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