A conservatory that would be permitted development in England isn’t automatically permitted development in Scotland — the size limits, boundary rules and conservation area treatment are set separately by Scottish planning guidance.

The single-storey extension limits that apply in Scotland

mygov.scot guidance sets out that a single-storey extension, which is how a conservatory is normally treated, doesn’t need planning permission in Scotland provided it’s built at the back of the house, doesn’t project more than 3 metres from the original wall for a terraced house or 4 metres for a detached or semi-detached house, has eaves no higher than 3 metres, and reaches no more than 4 metres in total height. These figures are broadly similar in shape to England’s permitted development rules covered elsewhere on this site, but they aren’t identical, and relying on English figures when planning a Scottish build risks getting the size wrong.

Ground area and garden coverage limits

Beyond the projection and height limits, Scottish guidance also caps how much of the property a permitted development extension can add: it must not increase the total ground area of the original house, and it must not result in more than half of the garden area (specifically the area around the original house, excluding the house itself) being covered by additions. This garden-coverage limit is conceptually similar to England’s 50% garden rule covered elsewhere on this site, but is set out under Scotland’s own guidance and enforced by Scottish planning authorities.

Conservation areas remove the permitted development right entirely

mygov.scot guidance is direct on this point: permitted development rights for this type of extension don’t apply at all if the property is in a conservation area. This is a stricter position than England’s general approach, where conservatories can often still be permitted development within a conservation area subject to other conditions — in Scotland, being within a conservation area takes a single-storey rear extension out of permitted development altogether, meaning a full planning application is needed regardless of how modest the design is.

Multi-storey extensions and the 10-metre boundary rule

Where a proposed structure is more than single-storey, Scottish guidance applies a materially different test: it must sit at least 10 metres away from any property boundary to qualify as permitted development, alongside not exceeding the height of the existing house and not exceeding the original ground area. Most conservatories are single-storey and fall under the simpler rear-extension rules above, but this distinction matters for anything built over an existing single-storey structure or as part of a larger project.

Why checking with the council still matters, even within the limits

mygov.scot’s own guidance is explicit that homeowners should always check with their council to confirm whether planning permission is actually needed, since meeting the permitted development size and location conditions doesn’t automatically rule out other requirements — building warrant approval (Scotland’s equivalent of building regulations approval), listed building consent, or conditions attached to the property itself can still apply even where planning permission specifically isn’t required.

FAQs

Does a conservatory in Scotland need a building warrant even if it doesn’t need planning permission?

Often yes — planning permission and building warrant approval are separate systems in Scotland, and a structure exempt from planning permission as permitted development can still require building warrant sign-off depending on its size and how it’s built.

Are the size limits the same for a bungalow as a two-storey house?

The core single-storey extension limits described above apply regardless of whether the existing house is a bungalow or has an upper floor, since the rules are based on the extension itself being single-storey, not the height of the original house.

What if my Scottish property already has a rear extension?

Ground area and garden coverage limits are cumulative, meaning a previous extension counts toward the limit for a new one — checking what’s already been added, not just what’s newly proposed, is essential before assuming a conservatory will qualify as permitted development.

Sources

This guide draws on the following primary sources, current as of 18 September 2026:

• mygov.scot: Add an extension to your house

Related guides

Compare Conservatories is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not legal or planning advice on any specific property — always confirm requirements directly with your local planning authority.