Garage Conversion Planning Permission in the UK

The rules for planning a garage conversion can be confusing. A lot of guides just say you don’t need planning permission. This is the case with many projects, but there are a few important exceptions.

Also the rules may be different for attached, integral and detached garages. Whether you need permission or not will depend on the type of property, the location and how you plan to use the converted space.

This guide covers when you need planning permission, how permitted development works and what is different in the four UK nations. It also tells you how to inspect your own property before you start work.

The Quick Answer

In most cases you will not need planning permission for a conversion to an attached or integral garage provided you don’t make major changes to the outside of the building. This work is often categorised as permitted development.

Permitted development rights allow homeowners to carry out certain types of building work without the need for a getting a full planning application.

Then there are building codes and all garage conversions will require approval under the building regulations, even if you don’t need planning permission.

There are a few notable exceptions.

You may need planning permission if your property is listed, if it is within a conservation area and there is an Article 4 direction or if there is a planning condition protecting the garage for parking use.

The permitted development rights we cover here apply to houses, so there are different rules for flats and maisonettes too.

A self-contained annexe may also require planning permission. This is one of those areas that homeowners need to be extra cautious with.

The Legal Basis: What Does “Permitted Development” Mean?

Permitted development is a legal right and not just a vague understanding with your local council.

Certain building works and changes of use are considered as development under Section 55 of the Town and Country Planning Act 1990. Planning permission may be required for this type of development.

The GPDO or Town and Country Planning (General Permitted Development) (England) Order 2015 grants automatic planning permission for certain types of works.

This means you can do qualifying work without the need for a separate planning application.

Garage conversions may have different uses for these rules. The rules that apply depend on what type of garage it is and what work you are planning to do.

Attached and Integral Garages: Class A

Integral or attached garage is part of the main house.

External works are allowed to be included in Class A for planning purposes by the GPDO. This is exactly the same part of the rules that applies to house extensions.

Simple internal conversion does not need to be dependent on Class A at all. If you are adding insulation, plastering the walls, putting in a partition or updating the electrics you are not enlarging the building.

If you change the exterior of the garage, then the key planning issue arises.

For example, you could take out the garage door and put in a wall, window or new door.

This is permitted development as long as the external changes comply with the permitted regulations and the building is not extended.

Some streets require additional design specifications. Your local planning authority will be able to tell you if there are any limitations that apply to your property.

Detached Garages: Why Class E May Not Apply

Detached may also have additional complications.

A detached garage is considered an outbuilding because it is separate from the main house. Outbuildings are covered by the GPDO Class E

There are limits under Class E. These rules include building use, garden coverage and height.

Any new outbuilding created under Class E must be utilised for a purpose incidental to the enjoyment of the house. This would not include using the property as an independent home or annexe.

The important point is that Class E deals with the erection of new outbuildings.

A detached garage that already exists is different. It may have been built in accordance with the law many years ago. If the existing building is to be used as such, then class E does not necessarily apply.

Diverse interpretations may be possible in this area of planning law. Local planning authorities may also take different views.

The situation gets more serious if the garage is used as living space.

A detached garage used as an office, gym or hobby room is less likely to raise the same issues as with a proper room.

A bedroom made from a garage needs extra care. A garage with its own kitchen, bathroom and entrance needs more consideration.

If you are converting a detached garage to provide sleeping accommodation or an annexe, you should talk to your local planning authority before you start work. Or a pre-application inquiry or Lawful Development Certificate application can be looked at.

This makes you more sure before you spend money on the conversion.

When You Definitely Need Planning Permission

You will need to make a planning application in certain situations.

This can include:

Listed buildings. You may need listed building consent as well as planning permission. This can cover internal work as well as external changes.
Conservation areas with an Article 4 direction. An Article 4 direction can remove some permitted development rights. This is done to protect the character of an area.
A planning condition on the original house. Some properties have a condition that requires the garage to remain available for parking. This is common on some newer housing developments.
A self-contained annexe. A garage with its own kitchen, bathroom and separate access can be treated differently. This is especially important if it will be occupied separately from the main house or rented out.
Flats and maisonettes. The permitted development rights covered in this guide apply to houses. Flats and maisonettes have different rules.
Major external changes. Planning permission may be needed if you make major changes to the building. This could include raising the roof or increasing the building’s footprint.

How the Four UK Nations Differ

The basic idea behind permitted development is similar across the UK. The laws are not the same in every nation, though.

England is covered by the Town and Country Planning (General Permitted Development) (England) Order 2015.

Wales has its own permitted development rules. The basic approach is similar, but there are differences in the rules and local restrictions.

Scotland uses the Town and Country Planning (General Permitted Development) (Scotland) Order 1992. The classes and limits are different from those used in England.

Northern Ireland uses the Planning (General Permitted Development) Order (Northern Ireland) 2015.

If your property is outside England, don’t rely on the class numbers or specific limits used in an England-only guide.

Check the rules that apply in your own nation before starting work.

How to Check Your Permitted Development Rights

Before you assume your garage conversion is covered by permitted development, check the following.

1. Check the original planning decision notice.

Your local planning authority should have a public planning register. Look for conditions that remove permitted development rights or require the garage to remain as parking.

2. Check for an Article 4 direction.

Find out whether your property is in a conservation area or another area covered by an Article 4 direction. Your local authority should have this information on its website.

3. Check previous building work.

Previous extensions or other work may have used some of your permitted development allowance. This can affect what you are allowed to do now.

4. Speak to your local planning authority.

If you’re unsure about anything, ask the council before starting work. You may be able to make a pre-application enquiry.

Some councils offer this service for free. Others charge a small fee.

Getting an answer before work starts is much cheaper than dealing with a planning problem later.

The Lawful Development Certificate

You can apply for a Lawful Development Certificate (LDC) even if planning permission is not required.

It costs around £124-£310 determined by your local authority.

An LDC is not a planning permission and just a formal document that the work proposed or done is legal.

This can be useful if/when you sell the property. Buyers, solicitors and conveyancers may ask for evidence that the conversion didn’t require planning permission.

That process can be made easier and the risk of delays or disputes reduced by having the certificate.

What Happens If You Convert Without Permission?

If you needed planning permission for your garage conversion and started the conversion work without it, your local authority can take enforcement measures against your property.

There is a time limit on the use of planning law. They can be four years for some changes of use to a single dwellinghouse, or for certain offences involving building work. Other change of use is subject to enforcement for ten years.

You should not treat the time limits as a way around around planning permission.

This does not mean that unauthorised work is acceptable because it has been done before a certain period of time. The council can still ask you for making a retrospective application.

The application may be denied and you might also need to do all the conversion work you did for the garage.

To avoid these issues, It’s far safer to check the rules before you start than to try to work with a planning problem afterwards.

Sources

This guide is derived from the following original sources. It is intended as a general guide only and should not be used as a substitute for professional planning advice or for written confirmation from your local planning authority for your particular property.