Do I Need Planning Permission for New Doors and Windows?

If you’re planning to replace your doors or windows — or install new ones as part of a renovation or extension — one of the first questions you’ll likely ask is:

Do I need planning permission?

In many cases, the answer is no — but there are important exceptions. In this guide, we explain when planning permission is required, when it isn’t, and what UK homeowners should check before ordering new doors and windows.

The Short Answer

Most homeowners do not need planning permission to replace existing doors and windows, provided the work falls under permitted development.

However, planning permission may be required if:

• your property is listed

• your home is in a conservation area

• you are making significant changes to appearance

• the work forms part of a larger extension

• there are specific planning restrictions on the property

Replacing Existing Doors and Windows

In most standard homes, replacing doors and windows on a like-for-like basis does not require planning permission.

This usually includes:

• replacing old windows with new ones

• upgrading materials (for example, timber to aluminium)

• installing bifold or sliding doors in an existing opening

• changing frame styles, colours, or glazing types

As long as:

• the opening size stays the same

• the overall appearance is not drastically altered

• the property is not protected

…it will usually fall under permitted development.

Installing New Openings or Enlarging Openings

Planning permission is not normally required to add a new door or window opening at the rear or side of a property, provided permitted development rules are followed.

However, permission may be needed if:

• the opening is on the front elevation

• the change significantly alters the appearance

• it forms part of an extension that exceeds permitted development limits

Bifold Doors and Sliding Doors

A very common concern is whether large aluminium bifold or sliding doors require planning permission.

In most cases:

• No planning permission is required

• Bifold and sliding doors are allowed as part of permitted development

• This applies when replacing an existing rear opening or forming part of a permitted extension

Large glazed doors are now a standard feature of modern homes and are widely accepted by planning authorities.

Conservation Areas

If your home is in a conservation area, the rules are stricter.

You may need planning permission if:

• doors or windows face a public road

• you are changing materials, styles, or proportions

• the alteration affects the character of the area

Some conservation areas allow changes at the rear of the property but restrict alterations to the front elevation. Always check with your local authority before proceeding.

Listed Buildings

If your property is listed, you will almost always need listed building consent — and sometimes planning permission — for door and window changes.

This applies even if:

• the replacement is like-for-like

• the changes are internal

• the alterations appear minor

Approval must be obtained before any work is carried out.

Planning Permission vs Building Regulations

These two are often confused.

• Planning permission relates to appearance, design, and land use

• Building Regulations relate to safety, structure, and energy efficiency

Even when planning permission is not required, new doors and windows must still comply with Building Regulations, including:

• thermal performance

• safety glazing

• ventilation

• structural integrity

Most modern, high-quality door and window systems are designed to meet these requirements as standard.

New Builds and Extensions

If your doors and windows are part of:

• a new build

• a permitted extension

• an approved planning application

They are usually covered under the overall permission, provided they match the approved plans. Any changes to specifications after approval may require a variation.

Common Mistakes Homeowners Make

• Assuming planning permission is always required

• Confusing Building Regulations with planning rules

• Ordering products before checking conservation status

• Making front elevation changes without approval

• Relying on outdated or incorrect advice

Our Advice at Home Build Doors

At Home Build Doors, we:

• regularly supply doors and windows for planning-approved projects

• help customers understand whether planning permission may apply

• recommend systems suitable for conservation and listed properties

• work alongside architects, builders, and homeowners

If you’re unsure, it’s always better to check before ordering.

Final Thoughts

For most homeowners, replacing or upgrading doors and windows does not require planning permission, especially when replacing existing openings or installing doors at the rear of a property.

However, extra care is needed if:

• your property is listed

• your home is in a conservation area

• you are making significant design changes

• the work affects the front elevation

If you’re planning a project and want clarity before ordering, the team at Home Build Doors is always happy to help guide you through the process.