Garage conversion planning permission Back to Blog

Garage conversion planning permission

Garage conversion planning permission

You do not need to apply for planning permission for garages or outbuildings where the planned work is internal only and the project does not change the structure or external appearance of the building. Despite this, we do recommend that you consult with your Local Planning authority prior to carrying out work on a project just to make sure.

Planning permission for outbuildings and garages

All outbuildings are considered to be permitted development, meaning no planning permission is required. There are, however, some limitations (covered below).
Planning permission rules for outbuildings cover sheds, greenhouses and garages, as well as any other outside areas, such as ponds, kennels and other enclosures.

Garage building regulations

There are no building regulations that govern the conversion of a garage where the work undertaken does not alter the structure of the building. There are, however, building regulations for garages that come into play where a new garage is to be built that exceeds 15 square metres and has sleeping accommodation.

Any outbuilding that is created between 15 square metres and 30 square metres would not normally have to apply for building regulations approval, except in the case where that garage or outbuilding will contain sleeping accommodation.

If a new garage is to be attached to your home, this will require building regulations approval to ensure that it meets health and safety standards. If you are building a garage that is detached, the above rules apply.

Limitations for permitted development

In almost all situations, you do not need to seek planning permission for your garage if your changes will only be aesthetic and inside the building. Limitations apply to garage permitted development where:

  1. The garage is single storey with a maximum eaves height of 2.5 metres.
  2. There are balconies or raised platforms.

Other limitations apply to permitted development and these can be found on The Planning Portal.

Overall, we strongly recommend that any garage conversion or new garage build is discussed with your Local Planning Authority. They will be able to determine what (if any) regulations apply to you.

The information contained within this article is strictly for guidance only.  Cost2Build recommends that you always check current sources of information in case regulations have changed. Cost2Build cannot accept any liability for miscommunication of the law in the case of a change in regulation or any action done to a property based on the information held in this article.


  • img

    Rob Fisher

    0 Reply


    Remember, some Local Authorities will now allow garage conversions if parking is compromised. Also if the property is in a conservation area, or Area of Natural Beaty you must first get planning permission, or approval from your local authority.


Leave a reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> 
<del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>