Planning permission for doors & windows
Replacing windows and doors like-for-like is usually permitted development, but new openings, bay windows, conservation areas and listed buildings all change that.
Swapping windows and doors on a typical house rarely troubles the planners. It is when you change the appearance, add a projecting bay, or live somewhere protected that permission comes into play.
- Replacing windows and doors with units of similar appearance
- Repainting frames, and internal secondary glazing
- Upper-floor side windows if obscure-glazed and non-opening (or 1.7m+ above the floor)
- Forming most new windows in the original walls of a house (not designated land)
- Bay windows, which project out and are treated as an extension
- Listed buildings (listed building consent) and homes in conservation areas or designated land
- New upper-floor windows overlooking neighbours where privacy is a concern
- Properties where an Article 4 direction has removed the usual rights
Don't forget building regs
Replacement windows and external doors must meet building regulations for thermal performance, safety glazing and, in habitable rooms, means of escape and ventilation. Most installers self-certify through FENSA or Certass; where they do not, we can include the details in a building control submission.
For most like-for-like replacements you will not need us, but if you are forming new openings, adding a bay, or your home is listed or in a conservation area, we prepare the drawings and application. See our architectural drawings service or ask on the contact page.
Frequently asked
Do I need planning permission to replace my windows?
Usually not, if the replacements are a similar appearance to the originals. The exceptions are listed buildings, conservation areas and other designated land, and homes with an Article 4 direction, where even like-for-like changes can be controlled.
Do I need permission for a bay window?
Often yes. A bay window projects beyond the wall and is treated as an extension, so it is assessed against the permitted development extension limits. We can confirm and prepare the drawings.
Not sure where your project stands?
Checking whether you need planning permission is one of the first things we do: on the house, before any drawings. Tell us about your project and we'll confirm the route.