Do you need planning permission for windows?

Do I need planning permission?

Do you need planning permission for windows?

If you're thinking about replacing your windows, you might be wondering if there are any regulations you need to know. Or, if you need planning permission to change windows?

In some instances, you do need planning permission for windows, but just as importantly, there are strict building regulations for glazing that you need to adhere to.

As a reference, we've outlined the standard guidelines that apply when changing your windows. We've also answered the most common question we get asked about changing your windows.

Do you need planning permission for windows? (Updated for 2022)

If you're simply replacing windows in a similar style and size used on the build of the house, you DON'T need to apply for planning permission.

If you want to add new windows then in some cases you DO need planning permission.

There are guidelines for what falls into permitted development and for when you need planning permission:


You don't need planning permission to replace doors and windows with those of a similar appearance.

Building regulation approval is required on any glazing replacement work or you can use a registered installer (such as Everest) to complete approved work for you.

You DO need planning permission if:

  1. Fitting a skylight/roof light that protrudes more than 150mm beyond the plane of the roof slope or...
  2. higher than the highest point of the roof
  3. Fitting an upper-floor side elevation window that is not obscure-glazed and can open (unless the opening part is 1.7 metres from the floor of the room)

You MAY need permission if you live in a listed building, designated area or fall under an Article 4 Directive.

Planning permission for new windows

Do I need planning permission for a bay window?

Bay windows are a little different to a standard window as they protrude out from the wall of the house. Because of this, for planning permission purposes, they're treated like an extension:

  • If you're replacing an existing bay window then you DON'T need planning permission
  • If you're adding new bay windows at the front of the house, you DO need planning permission
  • If you're adding new bay windows at the side and back of the house usually you DON'T need planning permission

Do you need building regulations for new windows?

Planning permission controls IF you're allowed to build or change a structure. Building regulations control the quality and HOW you build a structure for safety purposes.

In addition to planning permission, you DO need to comply with building regulations for windows.

The main areas that building regulations cover for windows are:

  • Thermal heat loss - windows are required to meet the minimum standards for the amount of heat they allow to pass through. This is measured as a U-Value.
  • Safety glazing - in certain areas, safety glazing must be used to protect in case of an accident: for a door with glass up to 1500mm from floor level and for an unobstructed openable area at least 0.33 square metres and 450mm high and 450mm wide.
  • Ventilation - for rooms such as kitchens and bathrooms with a high production of steam, mechanical fans and window ventilation are needed. For other rooms, standard windows and trickle vents are used.
  • Fire safety - some external windows may need to be fixed shut to limit the spread of fire between properties.
  • Means of escape - a replacement window can only be reduced to a size that a person can escape through (or it can be the same size). New windows must follow the criteria set for escape windows (see here).

If you want to read more about building regulations for windows, you can find a list of the most recent approved documents for building regulations here.

Instead of seeking approval for building regulations yourself, you have the option to use a registered installer (such as Everest) who are approved to carry out window replacement work.

The supplier will give you a certificate that shows the work was completed by a registered supplier and that the windows meet building regulations.

If you're considering having bi-fold doors or French doors installed, read our guide here to see when you need planning permission.

Do I need planning permission for doors?

Do I need planning permission to paint my windows?

If you want to paint your windows a different colour then you DON'T need planning permission or building regulations.

However, depending on the property you live in, there may be restrictions to what you can do to the external appearance. For example, in listed buildings or for leaseholders.

Restrictions that you need to check before painting or replacing windows:

Listed buildings

You need listed building consent before replacing windows and you'll be restricted to the style and colour of your windows and frames.

Designated areas

Conservation Areas, National Parks, Areas of Outstanding Natural Beauty and World Heritage Sites have restrictions similar to listed buildings and you'll need to seek approval from the relevant authority before replacing any windows.

Article 4 Direction

Check that your local council doesn't have a directive in place that overrides permitted development rights.


For leasehold properties such as apartments and new build developments, there may be covenants in the lease that restrict the style and colour of windows you can have. Before making any changes to your windows (including painting a different colour) contact the management company for permission.

More information

Information is correct at time of publication: Updated June 2021.

Planning rules are subject to change. Always seek approval from your local planning authority before starting any building work.

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