Do You Need Planning Permission for a Garden Room in the UK?
Find out whether you need planning permission for a garden room in the UK, including size limits, rules, and when approval is required. Including what height you can go and how close to the boundary you can be.
Ash Gorecia
11/28/20251 min read


If you are thinking about adding a Garden Room the first questions you may likely ask yourself is:
Do I need Planning Permission?
In most cases the answer is no - but there are important rules you must follow to stay within UK permitted development rights.
Here's a clear breakdown of what you need to know.
What Is Permitted Development?
Permitted development rights allow home owners to build certain structures without needing formal planning permission, as long as they meet specific criteria.
Most well-designed garden rooms fall under these rights when they are placed correctly and stay within size limits.
When You DON'T Need Planning Permission
You generally won;'t need planning permission if your garden room:
Is single-storey
Is not used as a separate dwelling
Takes up Less than 50% of your garden area
Has a maximum Height of
4m with a dual-pitched roof
3m with any other roof type
2.5m if installed within 2m of a boundary
If your garden room meets these conditions, you can usually build under permitted development
When You Do Need Planning Permission
You may need planning permission if:
Your home is a Listed Building
You live in a Conservation area
The Garden Room will be used as Self-contained accommodation
The structure exceeds height or size limits
It's always smart to double-check with your local council.
How Opulux Helps with Planning
At Opulux Garden Rooms, we guide you through the rules before any installation begins.
We:
Assess your garden layout
Advise if planning permission is required
Help with drawings and documentation if needed
This ensures your project stays fully compliant and stress-free.
Final Thoughts
Most UK homeowners can build a garden room without planning permission, as long as they follow the permitted development rules.
If you're unsure about your situation, Opulux Garden Rooms can give you clear, honest advise.
Contact Opulux for a consultation