Can I Build a Garage Without Planning Permission? Checklist

You can often build a detached garage without planning permission at a house in England, but only when every Class E permitted development rule is met. The garage must be for a use incidental to the home, sit behind the principal-elevation line, remain single storey, meet the boundary and height limits, and keep the relevant curtilage coverage at or below 50%. An attached garage is an extension and follows different rules. Planning permission and Building Regulations are separate checks.

🔍 Check nearby planning applications. Search your postcode free →, then verify decisions and restrictions on the council record.

The measured rules below are for England. Wales, Scotland and Northern Ireland have their own planning and building-standards systems; use the UK nation check before relying on any dimension.

Garage Permission: Quick Decision Table

“Usually” is deliberate. Permitted development rights can be limited by the property type, an earlier planning condition or an Article 4 direction.

England Garage Permitted Development Checklist

A detached garage can fall within Schedule 2, Part 1, Class E of England's General Permitted Development Order. Work through every question, not just the height limit.

1. Is it at a house and incidental to that home?

Class E concerns development within the curtilage of a dwellinghouse for a purpose incidental to its enjoyment. Parking a household vehicle, storing cycles or keeping domestic tools will commonly fit that description. A self-contained home, bedroom or independent commercial unit is a different proposition and should not be treated as a permitted garage merely because it has a garage door.

Flats and maisonettes do not have the same Class E householder right. Some homes created through particular change-of-use or upward-extension rights are also excluded by the Order.

2. Is any part forward of the principal elevation?

No part of the building may be on land forward of a wall forming the principal elevation of the original house. That is not simply a “front garden facing a highway” test. On an unusual, corner or much-altered house, identifying the principal elevation can require the official technical guidance and the planning history.

A garage beside the house is not automatically safe: draw the principal-elevation wall line across the site plan and check whether any part crosses it.

3. Does it meet every height rule?

The boundary rule limits the whole building's overall height, not only the edge nearest the boundary. Measure from the relevant ground level and include roof build-up and ridge or parapet details. A design that is exactly on a limit leaves little tolerance for site levels or construction changes.

4. Is it single storey and free of excluded features?

Class E does not permit a building with more than one storey. It also excludes a verandah, balcony or raised platform. Calling an upper room “storage” does not turn a two-storey proposal into a single-storey garage.

5. Will the Class E coverage stay at or below 50%?

The statutory test is not simply “half the back garden”. It compares:

• the ground covered by buildings, enclosures and containers within the curtilage, other than the original dwellinghouse; with
• the total curtilage area, excluding the ground area of the original dwellinghouse.

Include the relevant existing detached garage, sheds and other structures in the calculation. Use the original house as defined for permitted development, not necessarily the house as it looks today. If the curtilage or original footprint is unclear, do not rely on an online garden estimate.

6. Is the property caught by a restriction?

Stop and investigate if any of these applies:

• the garage would be within the curtilage of a listed building;
• the land is in a conservation area, National Park, the Broads, a National Landscape or a World Heritage Site;
• an Article 4 direction removes the relevant right;
• a condition on an earlier permission removes permitted development or controls garages and parking; or
• the garage would be on designated land beside the house, or more than 20m from it, where the additional Class E restrictions can apply.

On designated land, England's Order includes a side-siting restriction and a 10m² aggregate limit for the specified outbuildings more than 20m from the house. Check the exact statutory categories rather than assuming every “protected area” works in the same way. Read more in Conservation Areas and Planning.

Detached and Attached Garages Are Different

A garage physically separate from the house is normally assessed under Class E. A garage joined to the house is normally an extension assessed under Class A.

Class A has its own rules for position, height, width, rear projection, materials and designated land. Those tests depend on the original house and the exact design, so the detached-garage numbers above cannot be reused. Start with the GOV.UK householder permitted development technical guidance or use the planning permission process guide if the design is outside permitted development.

Garage Building Regulations: A Separate Decision

Planning controls whether and where development is allowed. Building Regulations control matters such as structure, fire safety, moisture, ventilation, drainage and energy performance. Passing the planning checklist does not answer the building-control question.

Small detached garages in England

Under Schedule 2 of the Building Regulations 2010, a detached building with no sleeping accommodation can normally be exempt when:

• its floor area does not exceed 15m²; or
• it is detached and single storey, its floor area is over 15m² but does not exceed 30m², it has no sleeping accommodation, and either no point is less than 1m from its curtilage boundary or it is constructed substantially of non-combustible material.

The 30m² figure is a Building Regulations floor-area threshold, not a planning-permission size allowance. A 20m² timber garage tight to a boundary may satisfy the planning height test yet fail the exemption test. A 35m² garage may fit Class E planning limits yet still require Building Regulations approval.

Even where the garage building is exempt, separate controlled work can remain in scope — for example electrical installation, drainage, work to a shared or load-bearing structure, or later conversion to habitable use. Confirm the whole specification with the council building-control team or a registered building control approver before work starts.

Attached garages and conversions

An attached garage will normally need approval for foundations, structural stability and fire separation from the house. Creating a connecting doorway or altering a load-bearing wall is also controlled work.

Converting a garage to habitable accommodation will normally require Building Regulations approval even when planning permission is not needed. Insulation, damp protection, ventilation, fire escape, structure and any drainage must be assessed. The dedicated garage-conversion planning guide covers the change-of-use and external-alteration questions. Also check the original planning permission for a condition retaining the garage for parking; breaching that condition is a planning issue, not something Building Regulations approval cures.

Common Garage Traps

• Using “garden area” loosely: the Order uses the curtilage and original-dwellinghouse calculation.
• Checking ridge height but not eaves: Class E has a separate 2.5m eaves limit.
• Treating 30m² as a planning limit: it belongs to the Building Regulations exemption analysis.
• Ignoring a roof overhang near the boundary: assess the building as actually designed and measure the closest relevant part carefully.
• Assuming a prefab garage gets different rules: planning turns on siting, dimensions and use, not the sales label.
• Starting a separate use: an annexe, bedroom, workshop business or rented unit can raise use, planning and Building Regulations issues.
• Forgetting other regimes: land ownership, restrictive covenants, easements, the Party Wall etc. Act and access rights are separate from planning permission.

The Safest Next Steps

1. Confirm the UK nation, property type, curtilage and original-house footprint.
2. Draw a scaled site plan showing the principal-elevation line, every boundary, existing structures and the proposed garage.
3. Add eaves, ridge, roof type, floor area, use, materials and distance to the boundary.
4. Read the property's planning history for conditions and check the council's Article 4 and conservation-area information.
5. Ask building control whether the complete work is exempt or needs an application; do not ask only whether “a garage” is exempt.
6. If the England planning case is permitted development but the evidence is borderline or important for a sale, consider a lawful development certificate. It is optional, but gives a formal council decision on lawfulness based on the submitted plans.
7. If any Class E test fails, use the householder planning application route before building.

Garage Rules in Wales, Scotland and Northern Ireland

The Class E dimensions above come from the England GPDO. Do not copy them into a project elsewhere in the UK.

Official Sources

• The Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 1
• GOV.UK: permitted development rights for householders — technical guidance
• Planning Portal: outbuildings — planning permission
• The Building Regulations 2010, Schedule 2 — exempt buildings and work
• Planning Portal: is Building Regulations approval needed for an outbuilding?
• GOV.UK: lawful development certificates

Related PlanWatch Guides

• Permitted Development Rights Explained
• Do I Need Planning Permission for a Carport?
• Do I Need Planning Permission for a Shed?
• Neighbour Building Too Close to the Boundary
• Planning Permission for Listed Buildings
• Planning Enforcement: When Rules Are Broken

Frequently Asked Questions

Can I build a garage without planning permission?

Often, if it is a detached garage at a house in England and every Class E test is met. It must be incidental to the home, behind the principal-elevation line, single storey, inside the height and coverage limits, and free of the listed-building, designated-land and local restrictions described above. Attached garages use Class A instead.

What are the garage permitted development rules in England?

The headline tests are position behind the principal elevation, single-storey construction, maximum 2.5m eaves, maximum overall height of 4m for a dual-pitched roof or 3m for another roof, a 2.5m overall limit where any part is within 2m of the curtilage boundary, and the Class E 50% curtilage-coverage test. Property, use and protected-land exclusions also matter.

Does a detached garage need Building Regulations approval?

Not always. In England, the small detached-building exemptions cover certain buildings no larger than 15m², and certain detached single-storey buildings no larger than 30m² where there is no sleeping accommodation and the boundary-distance or non-combustible-material test is met. Separate electrical, drainage or structural work may still be controlled.

Does an attached garage need planning permission and Building Regulations approval?

For planning in England, an attached garage is an extension and must be tested against Class A rather than Class E. If it does not meet Class A or local rights have been removed, it will normally need planning permission. Building Regulations approval will normally be required for an attached garage's structure, foundations and fire separation.

One practical point: get the planning and building-control answers against the same scaled drawing. A verbal “that sounds permitted” cannot show what dimensions, siting or construction were actually assessed.