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Lean-to greenhouse planning permission in England

Updated: 21 October 2026

You are about to stand a kit against the back wall, or you are about to bolt it to the house, and someone has told you a greenhouse never needs permission. Lean-to greenhouse planning permission in England depends on which of those two things you are actually doing. A structure stood in the garden, incidental to the house, is a Class E question under the Town and Country Planning (General Permitted Development) (England) Order 2015. A greenhouse attached to the house is not. GOV.UK's technical guidance for householders says buildings attached to the house are not permitted under Class E and are subject to Class A. The sizes you measured are on the [lean-to greenhouse comparison](/hub/raised-beds-greenhouses-and-compost/lean-to-greenhouse). This page is that split. It is not a ranking, and it is not legal advice. The local planning authority decides. Peter F. used legislation.gov.uk, GOV.UK, and the Planning Portal's householder notes. A qualifying purchase can earn a commission at no extra cost to you.

You are about to stand a kit against the back wall, or you are about to bolt it to the house, and someone has told you a greenhouse never needs permission.

Our top picks

Ohuhu Ohuhu 210 cm lean-to greenhouse

Best overall

Ohuhu Ohuhu 210 cm lean-to greenhouse
8.2/10about £59.99
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VOUNOT VOUNOT 200 cm lean-to greenhouse

Best value

VOUNOT VOUNOT 200 cm lean-to greenhouse
8.2/10about £36.99
View offer
Outsunny Outsunny 6 × 4 ft lean-to greenhouse

Alternative

Outsunny Outsunny 6 × 4 ft lean-to greenhouse
7.2/10about £157.69
View offer
On this page
  1. 1.Stood against the wall
  2. 2.Fixed to the house
  3. 3.What else still applies
  4. 4.The four heights in this set

Stood against the wall

Class E is the outbuilding route for a dwellinghouse in England, when the greenhouse is incidental to enjoying the house and is not attached to it. The Order sets limits you can check before you assume you are inside them. The total ground covered by buildings other than the original house must not exceed 50 per cent of the curtilage, so sheds you already have count. No part may sit forward of the wall that forms the principal elevation. The building is single storey. Height must not exceed 4 metres for a dual-pitched roof, 2.5 metres if any part is within 2 metres of the boundary, or 3 metres in any other case. Eaves must not exceed 2.5 metres. It is not Class E in the curtilage of a listed building. A lean-to roof is often a single slope, so the 4 metre dual-pitch figure is the wrong one to assume. If you are within 2 metres of a boundary, the line that matters is 2.5 metres overall. The Planning Portal's outbuildings note puts that cap in plain English. Being under it is not consent if you are also forward of the principal elevation, over the 50 per cent coverage, or in a flat. Article 4 directions can remove these rights on a particular street. Ask the authority if you are unsure whether one applies.

Fixed to the house

Bolting the frame to the house, or building it so that it enlarges the house, takes you out of Class E. That is the GOV.UK sentence this decision turns on: an attached building is not permitted development under Class E and falls to be considered under Class A. Class A is the extension route. The Planning Portal's conservatory note, for a single-storey rear addition, gives a rear projection of 4 metres on a detached house or 3 metres otherwise, an overall height of 4 metres, and eaves no higher than 3 metres within 2 metres of a boundary. Use those figures only if your greenhouse really enlarges the house. A cover leant against the wall and held by stakes may still be the Class E case. A polycarbonate house screwed into the brick, with the wall as part of the enclosure, is the case to check as Class A. If you are unsure which case you are in, describe the fixing to the planning authority before you drill. How to put up a lean-to greenhouse tells you not to drill until the frame is square. It does not tell you that drilling is permitted.
Ohuhu Ohuhu 210 cm lean-to greenhouse

Testsieger

Ohuhu Ohuhu 210 cm lean-to greenhouse
8.2/10about £59.99
View offer

What else still applies

These Class E and Class A limits are householder rights for a dwellinghouse in England. They do not apply to a flat, or to a building that contains flats. A listed building is outside Class E where the work is in its curtilage, and listed building consent is a separate consent from planning permission. An Article 4 direction can withdraw a right that the Order would otherwise give. Scotland, Wales, and Northern Ireland have their own orders. Do not apply this English 2.5 metre line there. The Party Wall etc. Act 1996 is not planning permission. Section 6 deals with excavation. There is a 3 metre case and a 6 metre case, depending on how close you dig and how deep that dig is relative to the neighbour's foundations. A slab kit with no excavation is a different case from a concrete footing on the boundary. Planning permission, if you need it, does not replace a party wall notice. If you are excavating near a neighbour, or the wall is a party wall, that is the point a surveyor or the adjoining owner comes in, not a longer ground bolt.

The four heights in this set

The listing heights are 180 cm for both VOUNOT covers, 210 cm for the Ohuhu, and 214 cm for the Outsunny. All four sit under 2.5 metres, which is 250 cm, on the figure printed in the file. That does not grant permission. A 214 cm house within 2 metres of a boundary can still fail Class E if it is forward of the principal elevation, if other outbuildings already cover half the curtilage, or if you have attached it to the house and Class A is the real test. A 180 cm cover can fail for the same reasons. A movable cover is not automatically permitted development, because movable does not answer the attached-building test or a listed building. Who should buy which listing, once you know the class, is the best lean-to greenhouse page. If the authority says the proposal is not permitted development, their decision replaces this summary.

Common questions

Does a lean-to greenhouse need planning permission in England?
Sometimes. A detached incidental greenhouse is judged under Class E. A greenhouse attached to the house is not Class E. GOV.UK says attached buildings are considered under Class A. Height under 2.5 metres, the 50 per cent curtilage limit, and the principal-elevation rule can each take a Class E project out of permitted development. The local authority is the place that confirms which case you are in.
What changes if I bolt it to the house?
The class changes. A kit leant on the wall and anchored in the ground can still be an outbuilding. A kit fixed so that it enlarges the house is an extension question under Class A, with the conservatory-guide limits of 4 metres or 3 metres of rear projection, 4 metres of height, and eaves within 2 metres of a boundary no higher than 3 metres. Describe the bolts to the authority before you treat them as minor.
How tall can it be within 2 metres of the boundary?
Under Class E in England, a building within 2 metres of a boundary must not exceed 2.5 metres in height. Eaves elsewhere in Class E must also stay within 2.5 metres. The four listing heights here, 180 cm to 214 cm, are under 250 cm on the printed figure. They still fail if another Class E limit is broken, or if the greenhouse is attached and Class A applies instead.
I live in a flat. Do these rules apply?
No. The Class E and Class A limits summarised here are householder permitted development for a dwellinghouse in England. They do not apply to a flat. You need the planning authority's position for that building, and you may also need the freeholder. Do not rely on a greenhouse retailer saying the kit is movable.
The house is listed. What then?
Class E does not permit this kind of outbuilding in the curtilage of a listed building. Listed building consent is separate from planning permission, and you can need one, the other, or both. An Article 4 direction is a further way rights are removed, including on houses that are not listed. Ask the authority before you break ground.
Does planning permission replace a party wall notice?
No. The Party Wall etc. Act 1996, including the excavation cases in section 6 at 3 metres and 6 metres, sits beside the planning system. A slab with no dig is not the same as a footing on the boundary. If you need planning permission, that decision still does not notify the neighbour under the Act.
Do these English limits apply in Scotland?
No. This page is the English Order. Scotland, Wales, and Northern Ireland each have their own permitted-development rules. Do not export the 2.5 metre boundary cap, or the Class E and Class A labels, as if they were the law in those nations. Check the relevant government guidance, or the local authority, before you site the kit.

Related pages

Lean-to greenhouse buying guide

Lean-to greenhouse

Best lean-to greenhouse for the job, not the stars

How to put up a lean-to greenhouse without a twist

Polycarbonate or polythene on a lean-to greenhouse

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these listings were read on 19 October 2026. Page updated 21 October 2026.

  1. Town and Country Planning (General Permitted Development) (England) Order 2015, Class E (retrieved 2026-10-19)
  2. GOV.UK permitted development rights for householders, technical guidance (retrieved 2026-10-19)
  3. Planning Portal outbuildings guide (retrieved 2026-10-19)
  4. Party Wall etc. Act 1996, section 6 (retrieved 2026-10-19)
  5. Consumer Rights Act 2015, section 9 (retrieved 2026-10-19)
  6. RHS ventilation and shading in greenhouses (retrieved 2026-10-19)
  7. Growsave, alternative greenhouse materials (retrieved 2026-10-19)
  8. Better Growing Spaces, lean-to greenhouse buying guide (retrieved 2026-10-19)
  9. amazon.co.uk lean-to greenhouse listings captured 19 October 2026 (retrieved 2026-10-19)