Do You Need Planning Permission for a Garden Sauna in the UK?

In most cases, a garden sauna in the UK does not require planning permission. But there are important exceptions. Here is what you need to know before you build.

One of the most common questions we receive is whether a garden sauna requires planning permission. The short answer is: in most cases, no. But there are important exceptions, and getting this wrong can be costly. Here is a clear guide to the rules.

Permitted Development Rights

In England, most garden buildings — including saunas — fall within 'permitted development rights', which means they can be built without formal planning permission, provided certain conditions are met. These conditions are set out in the Town and Country Planning (General Permitted Development) (England) Order 2015.

The Key Conditions for Permitted Development

• —The building must be in the garden (curtilage) of a house — not on agricultural land or a separate plot
• —The maximum height is 4 metres for a dual-pitched roof, or 3 metres for any other roof type
• —The building must not be forward of the principal elevation of the house (i.e. not in the front garden)
• —The total area covered by outbuildings must not exceed 50% of the total garden area
• —The building must not be used as a separate dwelling
• —If the house is a listed building, permitted development rights do not apply

When Planning Permission IS Required

There are several situations where permitted development rights do not apply and formal planning permission is required:

• —Listed buildings: Any outbuilding on the curtilage of a listed building requires listed building consent
• —Conservation areas: In designated conservation areas, permitted development rights are more restricted — outbuildings over 10 square metres within 20 metres of a highway may require permission
• —National Parks and AONBs: Properties within National Parks (including the New Forest and South Downs) and Areas of Outstanding Natural Beauty have more restrictive rules
• —Article 4 Directions: Some local authorities have removed permitted development rights in specific areas via Article 4 Directions
• —Flats and maisonettes: Permitted development rights for outbuildings do not apply to flats, maisonettes, or converted houses

Building Regulations

Even where planning permission is not required, building regulations may still apply. In general, a detached garden building under 30 square metres with no sleeping accommodation does not require building regulations approval. However, the electrical installation within the sauna will need to comply with Part P of the building regulations and should be carried out by a qualified electrician.

How We Help

At South Coast Sauna Co., we provide planning guidance as part of every consultation. We assess your specific property and location, advise on whether planning permission is required, and can liaise with your local planning authority on your behalf. We have extensive experience working in conservation areas, National Parks, and with listed buildings across Dorset and Hampshire.