Guide · By Lewis Hogg · November 2026
Does a garden sauna need planning permission?
When a garden sauna counts as permitted development in England, the 2.5m height rule near boundaries, listed buildings and designated land, and building regs for electrics and wood burners.
Short answer
In England, most garden saunas are treated as outbuildings and can go up under permitted development without planning permission, if they meet the limits below. If you're unsure, check with your council.
A sauna is an outbuilding
The Planning Portal lists sauna cabins among the outbuildings it treats as incidental to the enjoyment of a house (Planning Portal: outbuildings).
Permitted development limits (England, houses)
From the Planning Portal:
- Not forward of the principal elevation (usually the front) of the house.
- Single storey, with eaves no higher than 2.5m.
- Maximum overall height 4m with a dual-pitched roof, or 3m for any other roof.
- Maximum height 2.5m if within 2m of a boundary.
- No verandas, balconies or raised platforms over 0.3m.
- No more than half the land around the 'original house' covered by additions and outbuildings.
- In National Parks, the Broads, AONBs (National Landscapes) and World Heritage Sites, buildings more than 20m from the house are limited to 10m².
- On designated land, including conservation areas, buildings at the side of the house need permission.
- Within the curtilage of a listed building, any outbuilding needs planning permission. Listed building consent may also be relevant, so ask the council.
Permitted development doesn't apply to flats and maisonettes, some converted houses, or where an Article 4 Direction or a planning condition has removed those rights. The government's technical guidance has the full detail (gov.uk technical guidance).
In practice
Barrel saunas with a chimney are often close to 2.5m tall. Measure the total height, including the flue, before you site one within 2m of a fence. If you want certainty, you can apply for a Lawful Development Certificate through the Planning Portal.
Building regulations
Planning and building regulations are separate. According to the Planning Portal, small detached outbuildings under 15m² floor area with no sleeping accommodation generally don't need building regulations approval. Between 15m² and 30m², they're usually exempt if at least 1m from a boundary or built substantially of non-combustible materials (Planning Portal: building regulations).
Electrics
A new circuit to a garden building is notifiable under Part P in England, so use a registered competent person electrician (Approved Document P). Builders often state what their heaters need: TLC Spas says 40 amps and Nuovo Luxury says 32 amps for electric heaters.
Wood burners
Installing a solid-fuel stove and flue is building regulations work under Part J. Use a HETAS-registered installer or notify building control (hetas.co.uk, Approved Document J). If you live in a Smoke Control Area, check your council's rules (gov.uk smoke control rules).
Wales, Scotland and Northern Ireland
Each has its own rules. Don't assume the English limits apply.
- Wales: gov.wales/planning-permission-for-householders
- Scotland: mygov.scot/planning-permission
- Northern Ireland: nidirect.gov.uk/articles/planning-permission
This guide is general information, not legal or planning advice. Rules change and local restrictions apply. Check with your local planning authority before you build.
Last checked November 2026.
