Do I Need Planning Permission for Bifold or Sliding Doors in the UK?

Do You Need Planning Permission for Bifold or Sliding Doors?

Adding bifold or sliding doors is a fantastic way to open up your living space and create a smooth transition between your home and garden. But before getting started, many homeowners wonder whether planning permission is needed. The reassuring news is that in most situations, these types of installations are covered under what’s known as ‘permitted development’—meaning you likely won’t need formal planning consent. In this guide, Horizon Windows and Doors walks you through everything you should know about planning rules in the UK for bifold and sliding doors.

What Are Permitted Development Rights?

Permitted development rights allow you to carry out specific home improvements without going through the full planning permission process. These rights were created to simplify smaller changes that have minimal impact on neighbouring properties or the overall character of your home.

For most UK homeowners, replacing old windows or doors with modern bifold or sliding alternatives is generally allowed under permitted development—especially when the changes don’t dramatically alter the home’s look or structure.

However, it’s important to note that permitted development isn’t one-size-fits-all. These rights can vary based on location, property type, or whether your home is in a specially designated area, like a conservation zone. In some cases, they may not apply at all—especially for listed buildings.

When You Don’t Need Planning Permission

In most typical cases, installing bifold or sliding doors doesn’t require planning permission. If you’re replacing existing doors or windows with similar-sized bifold doors, you’re likely in the clear—especially when no significant structural changes are involved.

If you’re swapping out old French doors or patio doors for bifold options within the same opening, or replacing a rear-facing window with a set of sliding doors of similar dimensions, planning approval is usually unnecessary.

Changes that are made to the rear of the property and open onto the garden tend to fall well within the scope of permitted development. Since these updates don’t usually affect the street view or neighbouring properties, they’re often considered standard home upgrades.

When Planning Permission Is Required

While permitted development offers flexibility, there are several situations where planning permission will be required. It’s important to identify these early to avoid project delays or legal issues.

• Major Extensions or Structural Work – If your new bifold doors are part of a wider renovation or extension, planning permission may be needed for the overall build—even if the doors themselves wouldn’t normally require it
• New Openings in External Walls – If you’re creating a brand-new doorway or significantly altering the façade—especially on a street-facing side—you’ll likely need planning approval.
• Protected Properties – Homes located in conservation areas or those with listed status are subject to stricter controls. Installing bifold or sliding doors in these properties usually requires formal permission, regardless of the scale of the work.

Planning Rules by Property Type

Planning regulations differ depending on the type of property you live in. Knowing how the rules apply to your specific home type is key.

• Detached, Semi-Detached, and Terraced Houses – Most of these homes benefit from permitted development rights that allow for door installations without planning permission—as long as the structure or appearance isn’t significantly altered.
• Flats and Apartments – Unlike houses, flats typically don’t fall under permitted development rules. Any external changes—such as adding bifold doors—will likely require full planning permission, even for minor upgrades.

Installing Bifold Doors as Part of an Extension

Many homeowners choose to incorporate bifold doors into a rear extension to maximise natural light and create an open-plan feel. In this scenario, the focus turns to whether your extension meets permitted development criteria.

• General Guidelines: Rear extensions of up to 3 metres for attached homes and 4 metres for detached homes are usually allowed without planning permission.
• Size & Height Considerations: Extensions must not exceed the height of the original roofline, and side extensions should be no wider than half the width of the existing house. Going beyond these limits requires an official application.

How to Find Out If You Need Permission

If you’re unsure whether your project needs planning permission, there are a few simple steps you can take before moving ahead:

• Contact Your Local Planning Authority (LPA): Your LPA is the best source for detailed, site-specific advice. Many councils offer pre-application consultation services, which can help clarify your situation and reduce risk.
• Use the Planning Portal: The UK Planning Portal provides interactive guides and tools that make it easier to check if your proposed changes fall within permitted development.

Final Thoughts

Bifold and sliding doors can elevate your living space by bringing in more natural light and creating a stronger connection with your outdoor areas. In most cases, these upgrades don’t require planning permission and fall under permitted development rights—especially when replacing existing features.

However, if your home is in a conservation area, part of a listed building, or the installation involves major structural changes, it’s important to seek planning advice in advance.

At Horizon Windows and Doors, we offer a wide range of stylish, high-performance bifold and sliding doors to suit all types of homes. Whether you’re upgrading existing doors or planning a full renovation, our team can help you design the perfect solution.

? Get in touch at: sales@horizonwindowsanddoors.co.uk