Direct answer
Sometimes. On an English house, a garden sauna can fall under permitted development — Class E of the householder rules — if the building, the plot and the siting all fit. Sometimes you need a planning application. Sometimes those rights have already been taken away.
There is no honest one-line answer for every UK garden. Wellness One will not tell you that most installs are automatically fine, and we will not say that all of our models fall within permitted development. Measure the finished building against the rules, then check with your local planning authority.
If you want that answer on paper, you apply for a Lawful Development Certificate. We can share drawings and finished heights. We cannot certify lawfulness.
Class E at a glance
| Question | What the source actually says |
|---|---|
| Do I need planning permission? | There is no UK-wide “no.” Class E may apply on an English house if every limit is met. Where there is any doubt, ask the local planning authority. |
| Eaves | Maximum 2.5 m on a Class E outbuilding, wherever it sits. |
| Height near a boundary | If any part is within 2 m of the boundary of the curtilage, overall height for the whole building is 2.5 m. Further away: 4 m dual-pitch / 3 m other, still with 2.5 m eaves. |
| Other Class E limits | Not in front of the principal elevation; single storey; no more than 50% of the curtilage (excluding the original house); not in listed curtilage. |
| PD vs LDC | Permitted development is the right, if the facts fit. An LDC is the council’s formal confirmation. |
| Is this legal advice? | No. Building regulations and electrics are separate. |
The Class E test, in plain English
The rules below are England: the Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 1, Class E — buildings incidental to a house. Scotland, Wales and Northern Ireland have their own orders. Do not copy an England answer onto a Scottish plot.
Class E is for a house, not a flat. It is for a building used as a sauna, not a separate dwelling. Miss one limit and you are outside the class.
The conditions that most often matter for an outdoor sauna:
- It sits in the curtilage of a dwellinghouse, and is not used as a dwelling.
- It is not forward of a wall forming the principal elevation of the original house.
- One storey only.
- Total ground covered by buildings, enclosures and containers (excluding the original house) would not exceed 50% of the curtilage.
- Eaves not more than 2.5 m, on any part of the building, wherever it sits.
- Overall height, measured from the highest adjacent ground to the highest point of the building: 2.5 m if any part is within 2 m of the boundary of the curtilage; otherwise 4 m for a dual-pitched (or hipped) roof, 3 m in any other case.
- Not in the curtilage of a listed building.
- No verandah, balcony or raised platform over 0.3 m as part of the Class E building.
The Planning Portal’s outbuildings page is the readable summary. GOV.UK’s householder technical guidance is the fuller explanation, and it says the thing this page should have said all along: where there is any doubt, ask the local planning authority.
Height, eaves, and the 2 m line
Two different 2.5 m rules get blurred.
- Eaves. Class E eaves must not exceed 2.5 m, even if the ridge is higher and even if the building is well away from the boundary.
- Overall height near a boundary. If any part of the sauna is within 2 metres of the boundary, the entire building is capped at 2.5 m high for Class E.
Confirm the finished height on the current drawing for the model you are actually ordering. Measure from the highest adjacent ground, not from a brochure. If any part would sit within 2 m of a boundary, the Class E cap is 2.5 m for the whole building.
What to do in practice:
- Measure finished height and eaves against the current drawing.
- Measure the distance to every boundary, including the neighbour you never speak to.
- Siting more than 2 m from the boundary does not magic away the eaves rule, and it does not magic away listed buildings, Article 4, or the 50% test.
- Wellness One will not run a table that ticks every model as “PD.” Heights should be checked against current drawings, not copied from a rounded spec card.
Permitted development vs a Lawful Development Certificate
Permitted development means the Order grants planning permission if the facts fit. You do not fill in a planning application for that class of work. You also do not get a stamp that says you got it right.
A Lawful Development Certificate is a formal application asking the council to certify that an existing or proposed development is lawful. GOV.UK: it is the way to be certain. It is not compulsory. It is often the grown-up step on a garden building that sits near a boundary, near 2.5 m, or on a plot with a complicated history.
Wellness One can help you with drawings, heights and siting. We cannot certify lawfulness. The council does that.
When the usual Class E picture does not apply
Planning permission, or another consent, may be required — and Class E may not be available — in situations including:
- Listed building. Class E does not permit an outbuilding in the curtilage of a listed building. Listed building consent can also be in play.
- Conservation areas, AONB / national landscapes, National Parks, the Broads, World Heritage Sites (article 2(3) land). Extra limits apply, including a restriction on siting between a side elevation and the boundary, and a 10 m² cap on buildings more than 20 metres from the house in some designated landscapes.
- Article 4 direction. The local planning authority can remove permitted development rights for a street or an area. You only know if you check.
- A condition on the original (or a later) planning permission that removes PD rights.
- Flats, and some houses created through change-of-use permitted development.
- Principal elevation. A sauna in front of the house is not a Class E story.
- Use. If the building is in practice a room you live in — bedroom, bathroom, kitchen, separate dwelling — “incidental” is the wrong word.
England is not the whole UK
This page is read by people in Scotland, Wales and Northern Ireland. Their permitted-development orders are not the 2015 England Order. Height-near-boundary figures differ. Do not assume a 2.5 m / 2 m England answer travels. Ask the local planning authority for the plot you actually own.
Building regulations and electrics are separate
Permitted development does not switch off building regulations, electrical certification or the Party Wall Act. A garden sauna still needs a competent person for the electrical supply. That is a different conversation — see our electrical guide — and it is not settled by a Class E tick.
What to do before you order
- Find out whether the property is a house or a flat; listed; in a conservation area or national landscape; or subject to an Article 4 direction or a PD-stripping condition.
- Measure the proposed footprint against the 50% curtilage test, counting existing outbuildings and extensions.
- Measure height, eaves, and distance to boundaries against Class E (England) or the equivalent local rules. Confirm finished height on the current drawing.
- Decide whether you want an LDC before anyone lifts a panel.
- If Class E does not fit, apply for planning permission. That is ordinary. It is not a failure of the product.
Wellness One can share current heights and siting drawings so you can have that conversation with the council. We will not tell you that permission is not required.
Frequently asked questions
Do I need planning permission for an outdoor sauna?
Maybe. On an English house, a garden sauna may be permitted development under Class E if every limit is met — including the 2.5 m eaves cap and, if you are within 2 m of a boundary, a 2.5 m overall height cap. Confirm finished height on the current drawing. Check with your local planning authority. This is not legal advice.
Do all Wellness One models fall within permitted development?
No. We will not say that. Heights, eaves, siting, plot history and designations decide, not the brand name.
What is the 2.5 m / 2 m rule?
If any part of the outbuilding is within 2 metres of the boundary of the curtilage, Class E restricts overall height to 2.5 metres. Eaves must not exceed 2.5 metres even when the building is further from the boundary.
What is the difference between permitted development and a Lawful Development Certificate?
Permitted development is the right, if the facts fit the Order. An LDC is the council’s formal certificate that a proposed or existing development is lawful. Use an LDC when you want certainty.
We live in a conservation area / listed building. Are we fine?
Do not assume so. Listed curtilage is outside Class E. Conservation areas and other article 2(3) land have extra limits. Listed building consent may also apply. Ask the local planning authority.
Is this legal advice?
No. Confirm with your local planning authority. Rules differ across the UK and change. Building regulations and electrical certification sit alongside planning.
References
| Ref | Source | URL |
|---|---|---|
| [1] | Planning Portal — Outbuildings | https://www.planningportal.co.uk/permission/common-projects/outbuildings/planning-permission |
| [2] | MHCLG — Permitted development rights for householders: technical guidance (England) | https://www.gov.uk/government/publications/permitted-development-rights-for-householders-technical-guidance/permitted-development-rights-for-householders-technical-guidance |
| [3] | GOV.UK — Lawful development certificates | https://www.gov.uk/guidance/lawful-development-certificates |
| [4] | GOV.UK — When is permission required? | https://www.gov.uk/guidance/when-is-permission-required |
| [5] | GPDO 2015, Schedule 2, Part 1, Class E | https://www.legislation.gov.uk/uksi/2015/596/schedule/2/part/1 |