Thinking about adding a new carport, a larger garage or a practical garden shed? Before you start building, it’s important to understand the UK planning rules. Many small outbuildings can be built without formal permission, but there are limits on size, height and location. Here’s what you need to know before you pick up your tools.

When Do You Need Planning Permission?

In most cases, whether you need planning permission depends on the size and position of the structure on your property. In England, Scotland, Wales and Northern Ireland, small outbuildings such as carports, garages, sheds and greenhouses can often be built under permitted development rights – meaning you don’t need to apply for planning permission, provided certain conditions are met.

You can usually build without planning permission if:

• The building is single storey and the eaves height does not exceed 2.5 metres.
• The overall height does not exceed 4 metres for a dual-pitched roof or 3 metres for any other roof type.
• The building is not in front of the principal elevation of your house (i.e. not between your house and the road).
• The total area covered by outbuildings (including existing ones) does not exceed 50% of the land around the original house.
• The structure is not used as living accommodation.

If your property is in a conservation area, National Park, Area of Outstanding Natural Beauty or World Heritage Site, stricter rules apply, and you may need to apply for permission even for smaller buildings.

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Distance and Placement

Where you place your carport, garage or shed matters just as much as its size. Under permitted development:

• Outbuildings must be at least 2 metres from the boundary if they are over 2.5 metres high.
• If the building is within 2 metres of the boundary, its maximum height must not exceed 2.5 metres.
• Rainwater must be directed onto your own land – not onto your neighbour’s property.
• You cannot build directly over a public right of way.

It’s always wise to discuss your plans with neighbours before you start. A friendly conversation can prevent disputes later on.

What If You Need to Apply for Permission?

If your proposed building doesn’t meet the permitted development criteria, you’ll need to apply for householder planning permission through your local council’s planning portal. You’ll usually need to provide:

• A site plan showing the location of the proposed building.
• Elevations and floor plans with dimensions.
• Details of materials and finishes.
• Information about drainage and access if relevant.

The council will assess whether your proposal fits with local planning policies, building lines and the character of the area. Processing times vary, but most applications are decided within eight weeks.

Building Regulations

Even if you don’t need planning permission, your project may still need to comply with building regulations, especially if it involves electrical work, insulation, or is attached to the main house. Detached single-storey buildings under 15 square metres in floor area are generally exempt, provided they contain no sleeping accommodation. For buildings between 15 and 30 square metres, exemption may still apply if they are at least one metre from the boundary or built of non-combustible materials.

Always check with your local Building Control department if you’re unsure.

Covenants and Local Restrictions

Some properties are subject to restrictive covenants or estate management schemes that limit what you can build, even if planning permission isn’t required. These might specify materials, colours or the position of outbuildings. You can find details in your property deeds or by contacting your solicitor or the Land Registry.

If you live in a listed building, you’ll need listed building consent for any structure that affects its character, regardless of size.

Special Cases: Flats, Leasehold and Shared Land

Permitted development rights generally apply only to houses. If you live in a flat, maisonette or leasehold property, you’ll almost always need to apply for planning permission before adding any outbuilding. Shared driveways or communal gardens may also restrict what you can do.

Good Practice Before You Build

• Check the rules early – contact your local planning authority if you’re unsure.
• Measure carefully – small differences in height or placement can affect whether permission is needed.
• Consider access and light – make sure doors and vehicles can move easily.
• Choose materials that complement your home and surroundings.
• Keep records – save drawings, approvals and correspondence for future reference, especially if you plan to sell your home.

A well-planned project not only keeps you on the right side of the law but also adds value and functionality to your property. With the right preparation, you can enjoy your new carport, garage or shed with complete peace of mind.