Planning permission for windows

Most homeowners in England don’t need planning permission for windows. Replacing windows and doors on a house is permitted development, as long as the new ones look similar to the ones already there. The exceptions are new bay windows, some upstairs side windows, flats and listed buildings. Homes where the council has removed permitted development rights are another.

Planning permission for windows: the similar appearance rule

The test is whether the new windows look broadly like the ones the house was built with. White uPVC casements replacing white timber casements, or a new sash replacing an old one, usually pass. A change of style, such as casements in place of sashes, may not, so check first if you’re changing the look of the front of the house. The Planning Portal’s guidance sets out the conditions.

When you need planning permission for windows

• New bay windows. A new bay counts as an extension, so it may need permission. Replacing an existing bay like for like does not.
• Upstairs side windows. New windows on an upper floor in a side wall must be obscure glazed, and either fixed shut or opening only above 1.7 metres from the floor.
• Flats and maisonettes. Permitted development covers houses, so flats work differently. The lease often needs the freeholder’s consent too.
• Article 4 directions. Some councils remove permitted development rights in particular streets, often terraces in conservation areas, so changing windows needs permission there.
• Conservation areas, National Parks and National Landscapes. These may carry extra restrictions on what can be seen from the street.

Listed buildings

A listed building needs listed building consent for any significant works, inside or out, and windows are among the features councils protect most closely. Replacing original windows without consent is a criminal offence. Our guide to listed building windows covers what is usually allowed.

How to check

Ask your council’s planning department whether your house is in a conservation area, is listed, or has an Article 4 direction. Many councils publish maps online. If you’re unsure whether your plans count as similar appearance, describe them and ask; an informal answer now saves trouble later.

Planning permission and Building Regulations are different

Even where planning permission isn’t needed, the work must still meet double glazing regulations on energy, safety glass and escape. A FENSA or CERTASS registered installer certifies that part for you.

Before you order

If you need permission, apply before you sign a contract for made-to-measure windows. Once they’re in production, you usually can’t cancel. Choose a style that suits the house, such as sash windows or timber windows on a period front, and then compare quotes like for like.