Do You Need Planning Permission for a Garden Room?
In most cases, the answer is no. Many garden rooms in the UK will fall under permitted development, meaning they can be installed without needing formal planning permission. Garden rooms are typically classed as outbuildings or “incidental” structures, and are therefore allowed under standard permitted development rights.
However, this only applies if your property has permitted development rights and if your building meets certain criteria. You will not have permitted development rights if:
- Your property is a listed building
- You live on designated land such as a national park, conservation area, the Broads, a World Heritage Site or an Area of Outstanding Natural Beauty
It’s important to note that permitted development rules apply to houses only, not flats or maisonettes.
These rules apply throughout England, Scotland, Wales and Northern Ireland.
Maximum Garden Room Size Without Planning Permission
Do you need planning permission for a garden room? In many cases, you do not, provided the structure meets the following permitted development criteria:
- The garden room must be single-storey
- Maximum eaves height: 2.5 metres
- Maximum overall height: 4 metres with a dual-pitched roof, or 3 metres with any other roof type
- If the building sits within 2 metres of the boundary, the maximum overall height is 2.5 metres
- It must not sit in front of the principal elevation of your house
- It must not have verandas, balconies, or raised platforms
- It must not be used as a self-contained living accommodation
- It must not cover more than 50% of the land around the original property
- It must not exceed the height limits set for outbuildings on designated land
If your intended design exceeds these rules, then garden room planning permission is required.
Planning Permission for Garden Room Extensions
Garden room extensions follow similar rules but include extra requirements:
- The extension must be at the rear or sides of your property
- Materials used must be similar in appearance to the main house
- A rear extension must not extend past the rear wall by more than:
- 3 metres for attached or semi-detached properties
- 4 metres for detached properties
- A side extension must not be wider than half the width of the original house
- The extension must not exceed the height of the original property
Side extensions are not permitted on designated land.
If you wish to create an open plan connection between your garden room and your main home, the design will need to comply fully with UK Building Regulations.
Garden Office Planning Permission
Using your garden room as a workspace is perfectly acceptable under permitted development. A garden office does not usually require planning permission if it meets the structural rules of permitted development. However, if you intend to run a business that increases visitor traffic or alters the nature of your property, your local authority may request an application.
Special Planning Permission Considerations
Listed Buildings
Don’t let this consideration put you off the garden room you want. It is possible to get permission for a listed building; you just have to be aware of the rules surrounding your home. We have installed a considerable number of timber garden buildings for customers living in listed properties, and can do the same for you with the right permissions in place.
Designated Land
If your home is located within a national park, conservation area, World Heritage Site, or Area of Outstanding Natural Beauty, the size and positioning of permitted development outbuildings may be restricted. It is always worth checking before beginning a project.
Appliances and Amenities
Planning permission may be required if you intend to install:
- Plumbing for toilets, sinks or showers
- Heating systems
- Macerators or drainage connections
- External antennas
These fall outside the scope of standard permitted development.
Working or Living in Your Garden Building
Many of our customers contact us for a garden building so that they can have a space to work from during the day that is separate from their main house. Working from your garden building does not require planning permission; however, living in your garden building does.
With many young people still living with their parents, there are some people who have renovated sheds or garages in their gardens as summer houses for their children. However, installing a garden shed that will be used as living accommodation does require planning permission, and the structure must abide by Building Regulations. If you don’t adhere to planning permission requirements, you could face a significant fine and have to tear down your project and start it again. So, it’s important to be clear about your intentions from the start.
When Do Building Regulations Apply?
Building Regulations focus on safety, structural integrity and insulation. A garden room will not normally require Building Regulations approval, provided:
- It is detached from the main house
- The internal floor area is under 15 square metres
- It is not used for sleeping
If the building is between 15 and 30 square metres, you may still avoid Building Regulations if:
- It contains no sleeping accommodation
- It is built at least 1 metre from any boundary
- Non-combustible materials are used
Electrics, however, must always comply with Part P of the Building Regulations and must be installed by a qualified electrician.
Applying for Garden Building Planning Permission for Your Garden Building
If you need to apply for planning permission to have your new garden building installed on your property, you can apply on the Planning Portal website. While the costs involved in a planning permission application may vary, depending on the type of work you need done, the website has a fee calculator to help you work out how much you will be expected to pay. Waiting times are typically between 8 and 13 weeks.
Your Local Authority and Planning Permission
Every local council interprets rules slightly differently. If you are ever unsure about your specific circumstances, contacting your local planning authority is the best way to receive tailored advice. This is especially helpful if you intend to use your garden room for business purposes, or if you live in an area with additional restrictions.
Bring Your Dream Garden Room to Life
If you have a vision for a garden office, hobby room, entertainment space or relaxing retreat, Prime Stables can help you bring it to life. Our master craftsmen design and build beautiful bespoke timber garden rooms, and our installation team delivers across the UK and Europe. Call us today or request your free brochure to get started.
