Porch: do I need planning permission? (England, 2026)

Overview

The permitted-development rules

Permitted development (Class D) allows a porch up to 3m² in ground area and 3m high, provided it is at least 2m from any boundary fronting a highway. Larger or closer porches need full planning permission.

Whether these rules apply to your home depends on any conservation area, Article 4 direction or listed-building status at your address. Check yours below.

Check your planning route

Answer a few questions about your home and your plans. No email or sign-up — your verdict shows straight away.

Frequently asked questions

Do I need planning permission for a porch?

Usually not. Under Class D a porch is permitted development if its external ground area is no more than 3m², no part is more than 3m high, and no part is within 2m of a boundary fronting a highway. Larger or closer porches, or an Article 4 direction, mean a planning application is required.

How big can a porch be without planning permission?

Up to 3 square metres in external ground area, and no more than 3 metres high. Note the planning limit (3m²) is separate from the building-regulations threshold (30m² internal): a porch can be permitted development yet still need to meet other rules. Anything larger than 3m² needs planning permission.

How close to the boundary can a porch be?

No part of the porch may be within 2 metres of any boundary of the house that fronts a highway. This is the limit homeowners most often miss on a front porch close to the pavement — within 2m of that boundary, the porch falls outside Class D and needs planning permission.

Does a porch need building regulations?

Usually not. A porch built at ground level and under 30m² internal floor area is normally exempt, provided the existing front entrance door between house and porch stays in place, any glazing meets safety rules (Part K) and any electrics comply (Part P). Removing the front door or adding a WC brings it under control.

Can I put a toilet in a porch?

Not within the exemption. Adding a WC or substantial plumbing, or removing the front door to merge the porch with the house, takes it beyond the building-regulations exemption, so it would then need approval. It can also change whether the work still counts as a simple porch for planning. Check with Building Control first.

Do I need planning permission for a porch in a conservation area?

Not automatically — unusually, Class D porch rights apply even in conservation areas, so designated-land status alone does not remove them. But an Article 4 direction can remove the right, and a front porch is design-sensitive in a conservation area. Check the council’s register for an Article 4 direction before relying on permitted development.