Planning Permission for Garden Rooms
Good news: most garden rooms don't need planning permission. Here's what you need to know.
What is Permitted Development?
Permitted development allows you to build certain structures in your garden without needing to apply for planning permission. Garden rooms, offices, gyms and similar outbuildings usually fall under these rules, as long as they meet specific criteria.
This means you can often have a fully insulated, heated garden building installed without any paperwork or council approval.
The Key Rules
Height Limits
Maximum 2.5 metres if within 2 metres of a boundary. Otherwise, up to 4 metres for a dual-pitched roof or 3 metres for any other roof.
Position in Garden
Must be built behind the main house (not in front of the principal elevation). Cannot cover more than half the garden area.
Use
Must be used for purposes incidental to the main dwelling – such as a home office, gym, studio or hobby room. Not as a separate self-contained residence.
Single Storey Only
The building must be single storey with no balconies, verandas or raised platforms.
When Planning Permission May Be Required
There are situations where permitted development rights don't apply and you'll need to check with your local planning authority:
- Listed buildings – Any work to a listed property or its grounds usually needs consent.
- Conservation areas – Stricter rules apply, especially for larger buildings.
- Self-contained annexes – Buildings designed as independent living accommodation often require approval.
- Exceeding size or height limits – If your building doesn't fit within the rules above.
- New-build properties – Permitted development rights may have been removed as a condition of your property's original planning consent.
How LouMil Can Help
As part of every quotation, we'll discuss your garden layout, the size of building you're considering, and any factors that might affect permitted development – such as proximity to boundaries or the type of property you live in.
If we think planning permission might be needed, we'll let you know upfront. We won't start a project until you're clear on what's required.
For most customers, a garden office, gym, studio or entertaining space falls comfortably within permitted development – meaning no delays, no paperwork, and no council fees.