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Do Saunas Require Planning Permission in an AONB?

 

Adding a sauna to your garden is one of the most enjoyable ways to create a private wellness space and in many cases, it can be approached in planning terms just like installing a shed or garden outbuilding.

However, if your property is within an Area of Outstanding Natural Beauty (AONB), there are extra considerations. So it’s always wise to check with your local council before you proceed. Below is a clear guide to help you understand the principles before you start designing.

The Short Answer: Always Check First

In many cases, small outbuildings fall under permitted development, meaning formal planning permission isn’t required. However, in designated landscapes like AONBs, permitted development rights are more limited, and councils will consider the visual impact on the surrounding environment.

Because local restrictions and Article 4 directions can remove permitted development rights entirely, the safest first step is always to speak with your local planning authority.

Thinking of Swapping a Shed for a Sauna?

If your sauna is effectively a garden building or shed replacement, the same baseline rules generally apply.

Key placement rules

  • The building must not be positioned forward of the principal elevation (the front wall) of your home.

  • It should sit within the garden and be incidental to the enjoyment of the house, not used as separate living accommodation.

Height and structure limits

  • Outbuildings must be single storey.

  • If within 2 m of a boundary, the maximum overall height is 2.5 m.

  • Otherwise, the maximum height is typically 3 m (flat roof) or 4 m with a dual-pitched roof.

  • Eaves height should not exceed 2.5 m.

  • All outbuildings combined must not cover more than 50% of the land around the original house.

Extra Considerations in an AONB

Designated landscapes have tighter controls to protect their character and views. If the structure is more than 20 m from the house, it must not exceed 10 m² in area. Additional restrictions may apply to visibility, materials, and positioning.

These limits mean early planning and thoughtful design are especially important if you want a larger or more bespoke sauna.

Usage Matters Too

Garden saunas are usually fine as incidental leisure buildings, but:

  • They must not be designed for sleeping accommodation, which would trigger different regulations.

  • A well-designed sauna can often fit comfortably within permitted development rules. Even in sensitive locations when it’s carefully sized, positioned, and specified.

Before moving ahead, we recommend:

  • Checking your property’s planning status.

  • Speaking to your local council or applying for a Lawful Development Certificate for peace of mind.

  • Designing the sauna to complement your home and surroundings.

Installing a sauna in an AONB is absolutely achievable, it just requires a little more due diligence at the planning stage. By treating your sauna as you would a garden shed or outbuilding and confirming the details early, you can avoid delays and move forward with confidence.

If you’re considering a garden sauna and would like guidance on design, sizing, or navigating planning considerations, the Take Wellness team is always happy to help.