Most single garages under 15 cubic metres can be built without planning permission under permitted development rights in England and Wales. However, size, distance from boundaries, roof type and whether your property is listed or in a conservation area all affect eligibility. Always check your specific circumstances with your local authority before starting work.
What does permitted development mean for a garage?
Permitted development is a planning right that lets you carry out certain building work without needing to submit a planning application. For garages and outbuildings, this right exists under Part 2, Schedule 2 of the Town and Country Planning (General Permitted Development) Order 2015. It’s designed to simplify minor works that pose low risk to neighbours and the wider environment. The concept applies across England and Wales, though Scotland and Northern Ireland have their own rules. Understanding whether your garage falls within these bounds can save time and cost.
The key principle is that permitted development works must be ‘not materially different in character’ from the existing property. A single garage on a residential plot typically fits this test. However, the rules are strict on dimensions, siting and materials. If you exceed any threshold—size, height, proximity to a boundary—you lose the right and must apply for planning permission. This is why many homeowners either stay comfortably within the limits or engage a planning consultant to explore alternatives.
What size garage qualifies for permitted development?
A single garage building of no more than 15 cubic metres is the standard threshold for permitted development in most of England and Wales. To put that in perspective, a typical single garage is around 7×3 metres with a pitched roof—roughly 21 cubic metres—which exceeds the limit. A smaller structure, such as a 5×3 metre single garage with a lower eave height, may fall within 15 cubic metres. The cubic capacity is calculated from the external dimensions: length × width × height to the eaves (for pitched roofs, use the eave height, not the ridge). Measure carefully; underestimating size is a common mistake that can trigger enforcement action.
If your proposed garage is larger—say, a double garage or a single with high eaves—it will need planning permission. Some homeowners find this frustrating, but it’s worth remembering that planning permission, while requiring more time and paperwork, is routinely granted for residential garages that fit the character and setting of the property. If you’re considering a bespoke oak frame garage or a solar carport as part of an integrated design, the permitted development route may not be the only or best path; planning permission can actually unlock more design flexibility.
Where can you position a garage under permitted development?
Location rules are just as tight as size. A permitted development garage must sit at least 1 metre from any property boundary and at least 2 metres from the boundary if it’s closer to a public highway than the house itself. These distances ensure the building doesn’t infringe on neighbours’ land or create highway visibility issues. If your plot is small or irregularly shaped, these setbacks can quickly rule out permitted development. You also cannot build a garage in front of the main property if it would be closer to the highway than the house; it must be to the side or rear.
The positioning rules exist to protect neighbour amenity and maintain the streetscape. A garage set too close to a boundary or positioned prominently at the front of a property can affect light, privacy and the character of the area. If your plot doesn’t accommodate these margins, or if you want to position a garage for design reasons that don’t meet the rules, you’ll need planning permission. Many bespoke garage designs benefit from a planning application anyway, because it allows you to discuss materials, aesthetics and integration with the existing home rather than being constrained by the rigid permitted development criteria.
What about roof type and building materials?
Permitted development allows pitched or flat roofs, provided they don’t exceed 4 metres in height (or 3 metres if closer to a boundary than the main house). The material of the roof itself is not prescribed by the permitted development rules, so asphalt, slate, tiles or other traditional coverings are all acceptable. However, if you plan to integrate solar panels or solar roof tiles into your garage roof, the situation becomes more complex. Solar installations are generally permitted development on a dwelling house, but the interaction with a garage structure and whether the garage itself qualifies can be unclear. This is where many homeowners find that a planning conversation with the local authority, rather than assuming permitted development applies, saves confusion later.
Green oak timber is a beautiful and durable choice for garage frames, and there’s nothing in the permitted development rules that forbids it. Oak structures can be clad in a variety of materials—timber boarding, render, brick—all of which are acceptable under permitted development. If aesthetics matter to you, or if you’re building a garage that will be a feature of your home, planning permission gives you the freedom to specify premium materials and integrated features like solar carports or battery storage. The permitted development route prioritises speed and simplicity over design; if design is a priority, a planning application is often the better choice.
When do you definitely need planning permission?
Planning permission is required if your property is listed, located in a conservation area, or on land designated as an Area of Outstanding Natural Beauty (AONB). Even a modest garage that would otherwise be permitted development loses that right in these sensitive areas. Listed properties and conservation areas have stricter controls to preserve character and heritage. If you live in one of these areas, any garage will require planning permission and careful consideration of design, materials and siting. Local planning teams are usually helpful in these contexts and understand that homeowners need garages; the key is demonstrating that your proposal respects the setting.
You also need planning permission if your garage exceeds the size limits, breaches the boundary distances, or would be so prominent in the streetscape that it materially alters the character of the property. Additionally, if your property is already subject to a planning condition that restricts outbuilding construction, that condition overrides permitted development. Finally, if you’ve already used your permitted development right for another outbuilding on the same plot, you may not have capacity for a garage as well. Check your deeds, your local authority’s planning records and any notices served on the property. A 10-minute conversation with your planning officer costs nothing and often clarifies the position immediately.
What’s the practical next step?
Before you commit to a design or begin any work, contact your local planning authority and ask them, in writing or in person, whether a proposed garage would qualify for permitted development. Provide them with a sketch, dimensions and siting plan. A simple email with a photo of the plot and the proposed position is often enough. They will confirm whether you have the right to proceed without permission or whether you need to apply. This step takes a few days and can prevent costly mistakes. If permitted development doesn’t apply, don’t be discouraged; planning permission for a residential garage is rarely refused if the design is reasonable and the siting is considerate.
If you’re working with a bespoke garage designer or builder, they should be asking these questions as part of your initial brief. A conversation with a specialist who understands both the permitted development rules and the planning system can help you decide whether to pursue the faster permitted development route or invest in a planning application that gives you more design freedom. Many homeowners find that planning permission, while requiring a few more weeks, allows them to build something more integrated with their home—particularly if solar elements, premium materials or a considered aesthetic are priorities.