How big can a porch be without planning permission?

In England, a porch can be up to 3 square metres in floor area (measured externally) and no more than 3 metres high, and must be at least 2 metres from any boundary with a highway.

Do I need building regulations for a porch?

Small porches under 30m² with no sleeping accommodation are generally exempt from building regulations, provided they are not heated or used for other purposes.

Can I add a porch in a conservation area?

In a conservation area, PD rights for porches still apply — the same size limits as elsewhere apply. However, the materials must be in keeping with the character of the area. Check with your council if you are unsure.

Does a porch count as an extension?

Porches are a separate class of permitted development (Class D) from extensions (Class A). The porch PD allowance is separate and does not count against your extension allowance.

Can I build a porch on a listed building?

Listed buildings do not benefit from standard PD rights. You will need listed building consent for any alterations to a listed building, including adding a porch. Listed building consent is free to apply for.

Do I Need Planning Permission for a Porch?

Do I Need Planning Permission?

Usually NO

In most cases, NO — a porch is usually permitted development and does not need planning permission, provided it is within the size limits.

Keep reading for the full rules.

Adding a porch to the front of your home is a common improvement that most homeowners can carry out without planning permission. Under Class D of the General Permitted Development Order (GPDO), porches are permitted development provided they meet certain size and position criteria.

Permitted Development Rules by Region

Permitted Development Rules — England

✓The porch must not exceed 3 square metres in floor area (measured externally).
✓The porch must not be more than 3 metres in height.
✓The porch must not be within 2 metres of any boundary with a highway.

Size & Position Limits (England)

Requirement	Limit / Rule
Max floor area	3 m² (measured externally)
Max height	3 metres
Distance from highway boundary	At least 2 metres
Property type	Houses only (not flats or listed buildings)

When Do You Need Planning Permission?

Even if your project is usually permitted development, planning permission is required in these circumstances:

✗Your porch exceeds 3 square metres in area.
✗Your porch is more than 3 metres tall.
✗Your property is a listed building.
✗Your property is a flat or maisonette.
✗The porch is within 2 metres of a highway boundary.

What Happens If You Build Without Permission?

Building a porch that does not comply with PD rules without obtaining planning permission can result in an enforcement notice. You may apply retrospectively, but removal could be required if permission is refused.

Enforcement notices: Your council can issue an enforcement notice requiring you to stop the work, remove it, or restore the land to its original condition. You have a right of appeal against an enforcement notice.

Retrospective applications: If you have already carried out work that required planning permission, you can submit a retrospective planning application. If approved, this regularises the work. If refused, you may be required to remove it.

Time limits: For dwelling houses, the council generally has 4 years to take enforcement action for most types of work. For breaches of planning conditions, the time limit is 10 years. There is no time limit for listed building enforcement.

Typical Cost

Typical Project Cost

£1,500 – £8,000

Costs vary by size, specification and location

Planning Application Fee

£258

Householder application — no VAT on planning fees

See detailed cost breakdown →

How to Apply for Planning Permission

Frequently Asked Questions

Disclaimer: This is general guidance only and does not constitute legal or planning advice. Rules can change, and local circumstances vary. Always check with your local planning authority before starting any works.