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Garden rooms with a shed or storage

A garden room with a built-in shed gives you a proper room and somewhere for the mower and bikes, in one building. It's one of the smartest choices for a smaller garden, if you get the layout right.

Updated 22 October 2026

A dark garden shed with double doors among autumn leaves

The short answer: a garden room with a shed section at the side gives you a usable room and somewhere for the mower and bikes in one building, which saves space, foundations and often money compared with two separate buildings. The usual planning rules for outbuildings apply to the whole thing.¹

Why combine them

One footprint. In a small garden, a single building leaves more lawn than two.
One base and one installation. You only pay for foundations and fitting once.
Keeps the room tidy. Garden tools, bikes and the lawnmower stay out of your office or studio.

A pale green garden building with a chair and a cat on the lawn — A garden building can include a separate store at the side.

Getting the layout right

Separate doors. The store should have its own outside door so you're not walking muddy tools through the room.
Insulate the dividing wall. The store will be cold and possibly damp. Insulate the wall between it and the room as carefully as an outside wall.
Size the store for what goes in it. Measure the mower, bikes and the bulkiest tools before you choose. A store that's 1m wide sounds plenty until the bikes need to go in.
Security. Bikes and tools need a proper lock and hinges that can't be unscrewed from outside.

Planning and building regulations

The whole building, room and store together, is treated as one outbuilding. That means the same height and position limits apply: within 2m of a boundary, it must be no taller than 2.5m, and outbuildings, extensions and decking together must not cover more than half the garden.¹ For building regulations, it's the total floor area that counts towards the 15m² and 30m² thresholds.²

Test your own plans with the planning checker.

What it costs

Expect to pay for the shed section at a lower rate than the room itself, because it doesn't need the same insulation, glazing or finish. Ask for the room and store to be priced separately so you can compare quotes properly. Use the cost calculator for the room part.

Questions people ask

Does a garden room with a shed need planning permission?

Not usually. The room and the store are treated as one outbuilding, so the normal height and position limits apply.¹

How big should the shed section be?

Measure what's going in it. Bikes and a lawnmower usually need more width than people expect.

Related guides

A modern dark-clad cabin with large windows in long grass

Ideas for small gardensMaking the most of limited space.

A small modern garden room with glass doors at the end of a fenced garden

Planning permissionThe height and size rules.

A white timber garden building with French doors and a red roof

Garden room costsPrice the room part.

Sources

Planning Portal (England), Outbuildings: mini guide. Permitted development limits for outbuildings.
Planning Portal (England), Outbuildings: building regulations. When building regulations normally apply to outbuildings.