Home / Garden rooms in Surrey

Garden rooms in Surrey

Updated 22 October 2026

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

The short answer: most garden rooms in Surrey don't need planning permission under the national rules. What makes Surrey different is how much of it is protected. The Surrey Hills National Landscape covers about a quarter of the county¹, there are 200 conservation areas², and on that land the rules are tighter.

Planning permission in Surrey

Garden rooms count as outbuildings. Most can be built without planning permission if they sit behind the front of the house, have eaves no higher than 2.5m, and together with other buildings cover no more than half the garden. If any part of the room is within 2m of a boundary, the whole building must be no more than 2.5m tall; otherwise the limit is 4m with a dual-pitched roof, or 3m for any other roof. It must be single storey, with no veranda, balcony or raised platform over 30cm.³ In the grounds of a listed building, any garden room needs permission, and so does a room used as primary living space, such as a bedroom.⁴ Our planning permission guide explains every rule.

Protected land in Surrey

On designated land, which includes National Landscapes (the new name for Areas of Outstanding Natural Beauty) and conservation areas, you can't build a garden room to the side of the house without permission.⁵ In a National Landscape, national park or World Heritage Site, buildings more than 20m from the house can also cover no more than 10m² in total.³

Surrey Hills National Landscape: about a quarter of the county.¹
High Weald National Landscape: a small part of Surrey, in the south-east corner of Tandridge.⁶
Conservation areas: 200 across the county, managed by the district and borough councils.²

The Surrey Hills may grow. An order to add about 129km² to the Surrey Hills went to the Secretary of State on 7 September 2026 and had not been confirmed when we checked.⁷ If it's confirmed, homes in the added areas will move onto designated land, where the tighter rules apply. If you live near the current boundary, check the latest position before relying on permitted development.

Green Belt

Much of Surrey is Green Belt. In Tandridge, for example, it covers 94% of the district.⁸

Green Belt doesn't change the permitted development rules for garden rooms. It only matters if your room needs a full planning application, because the council will then judge it against Green Belt policy.

Which council to ask, and the 2027 change

Planning in Surrey is handled by the 11 district and borough councils. On 1 April 2027 they're being replaced by two new councils:⁹

East Surrey: Elmbridge, Epsom and Ewell, Mole Valley, Reigate and Banstead, Tandridge.
West Surrey: Guildford, Runnymede, Spelthorne, Surrey Heath, Waverley, Woking.

Until then, apply to your current borough or district council.

Building regulations

Building regulations don't normally apply to a garden room under 15m² with no sleeping accommodation, or one of 15m² to 30m² with no sleeping accommodation that is at least 1m from every boundary or built mostly of non-combustible materials.¹⁰ Running a new electrical circuit to it is notifiable work, so use a registered electrician. See our building regulations guide.

What a garden room costs in Surrey

Installed garden rooms typically cost £1,200 to £2,500 per m² across the UK¹¹, and one industry cost guide puts London and the South East 15% to 25% higher.¹² So a 4m x 3m room in Surrey might cost roughly £16,500 to £37,500 before extras.

That's a small share of a typical Surrey home's value: the average home sold for about £538,000 in Guildford in August 2026¹³, and £748,000 in Elmbridge in July.¹⁴

Questions people ask

Do I need planning permission for a garden room in Surrey?

Usually not, if it meets the national size and height limits. In the Surrey Hills or a conservation area you can't build to the side of the house, and in the Surrey Hills buildings more than 20m from the house are limited to 10m² in total.

Is my home in the Surrey Hills National Landscape?

It covers about a quarter of Surrey. Our free planning report checks your postcode, or use your council's planning map. A proposed extension may add more areas.

Which council do I apply to in Surrey?

Your current district or borough council until 1 April 2027, then the new East Surrey or West Surrey council.

Related guides

A small dark timber building beside a lawn and blue hydrangeas

Other areasRules and costs in other parts of the UK.

A garden path leading to a small building at the bottom of the garden

Free planning reportCheck protected land at your postcode.

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

Garden room costsReal prices by size, with a calculator.

Sources

Surrey County Council, Areas of Outstanding Natural Beauty.
Surrey County Council, Buildings and conservation.
Planning Portal (England), Outbuildings: mini guide. Permitted development limits for outbuildings.
Ministry of Housing, Communities and Local Government, Permitted development rights for householders: technical guidance.
Planning Portal, Outbuildings. Designated land rules for outbuildings.
Tandridge District Council, National Landscapes.
Natural England, Surrey Hills AONB boundary variation.
Tandridge District Council, Planning policy.
Surrey County Council, Government confirms new East and West councils for Surrey.
Planning Portal (England), Outbuildings: building regulations. When building regulations normally apply to outbuildings.
MyBuilder, Garden room cost price guide, updated 21 October 2026. UK price ranges for garden rooms, foundations, electrics, plumbing and fees.
BestBuilders, Garden room cost UK, updated 7 September 2026. An industry cost guide, not official data.
Office for National Statistics, Housing prices in Guildford.
Office for National Statistics, Housing prices in Elmbridge.