Garden rooms in Glasgow

A garden room gives you an office, gym or den without touching the house. Many in Scotland need neither planning permission nor a building warrant, but both have firm limits. A typical room costs £20,000 to £38,000 going by published figures, and you may spend less if you keep it small.

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What it usually costs

Published UK prices for a garden room. Guide figures, not quotes.
Size	Rough cost
Small (4.5–7.5 m²)	£12,000–£25,000
Medium (9–15 m²)	£16,000–£38,000
Large (18–24 m²)	£26,000–£50,000

Source: MyJobQuote garden room costs (6 October 2026). These are UK figures. We couldn't find a published Glasgow-only figure we'd trust.

Size, insulation and services drive the price. MyJobQuote puts a well-insulated room at £1,500 to £4,000 more than a poorly insulated one, and a toilet and shower at another £2,000 to £6,000. If your garden is long, bringing power, water or a waste pipe from the house adds to the cost. Remember that a toilet also pulls you into needing a warrant.

Rules, dates and prices on this page were last checked on 30 October 2026.

Planning and building warrant

You've got two separate questions here. Permitted development decides planning. The building standards schedules decide the warrant.

Planning: permitted development for a garden building

On a house, Class 3A of Circular 1/2024 (28 May 2024) allows a building for use with your home without an application, if:

it isn't forward of the front wall, or of a side wall that fronts a road
it's no higher than 4 m, with eaves no higher than 3 m
any part within 1 m of a boundary is no higher than 2.5 m
buildings and extensions cover no more than half of that front or rear garden
it isn't a separate dwelling

In a conservation area, the footprint limit is 8 m², or 4 m² within the grounds of a listed building. For a flat, Class 4B covers only a store of up to 1.5 m high, 1.2 m deep and 2.5 m wide.

Building warrant: the small-building exemptions

Detached single-storey building in the garden of a house.
Floor area	Warrant?	Must meet the regulations?
Up to 8 m²	No, unless an exception below applies. Sleeping accommodation or a flue is also an exception at this size.	No
Over 8 m², up to 30 m²	No, unless an exception below applies	Yes
Over 30 m²	Yes	Yes

Exceptions at either size: a toilet, shower or other sanitary facility; a fixed combustion appliance such as a stove; a building within 1 m of the house, unless it's also at least 1 m from every boundary.

Sources: Building Standards Technical Handbook: Domestic (April 2026), schedule 1 type 17 and schedule 3 type 4; LABSS, Interpretation of Small Buildings (September 2024).

So a garden room with a toilet needs a warrant at any size. A garden room you sleep in should be treated the same way, and that's the safe assumption to plan on. If you're in any doubt, ask your council's building standards team in writing and keep the reply. Our garden room guide goes through the edge cases.

Questions for whoever builds it

What's the floor area, measured the way the rules measure it? Check it against 30 m².
How far will it be from the house and each boundary?
How is it insulated, and how is damp kept out of the floor?
Who connects the electrics, and do I get a certificate?
If no warrant is needed, how will you show that it meets the regulations?

Common questions

Do I need a warrant if I just want an office?

Often not, if it's detached, single-storey, no more than 30 m², has no toilet, shower or fixed heating appliance such as a stove, and isn't too near the house and boundary. It must still meet the building regulations, even without a warrant. The exact wording is in our garden room guide.

Can my teenager sleep in it, or my parents live in it?

Plan on needing a warrant, and speak to building standards first. A building up to 8 m² loses its exemption if it contains sleeping accommodation. Above that, the rules don't name sleeping, but a room someone lives in starts to look like a separate dwelling. That also takes it outside permitted development.

Does it need planning permission in a conservation area?

Only very small buildings escape it. Permitted development in a conservation area stops at a footprint of 8 m², or 4 m² within the grounds of a listed building.

I live in a flat. Can I have one?

Only a tiny store under permitted development. Anything bigger needs planning permission, and you'd need to check who owns the garden ground.

Do I need foundations?

Something has to hold it up, but it needn't be concrete. LABSS guidance (September 2024) says ground screws or pad systems should be acceptable on a warrant job, provided an engineer's design or a SER certificate backs them.