Do I need planning permission for a porch?
Usually no, if the porch is under 3m² footprint, under 3m high, and at least 2m from any highway boundary. Listed buildings and some conservation area addresses need a full application.
Project guide · 2026
Porch Planning Permission in London: The Complete 2026 Guide
A porch is a small structure added to the front or side entrance of a house. Most small porches are permitted development but size, height and conservation area rules apply.
Typical cost
£3,000–£12,000
PD rights
Usually apply
Boroughs covered
All 33 London boroughs
Do You Need Planning Permission for a Porch?
Porches are permitted development under GPDO Schedule 2, Part 1, Class D within specific size limits.
London is different. Conservation area coverage, Article 4 directions and listed buildings are much more common in London than the national average, and any of them can remove the PD route. Use the address-level checker before you assume PD applies.
Permitted Development Rules for Porch
These are the national permitted development limits set by Schedule 2 of the GPDO. If your scheme stays within every rule and no local constraint removes PD, you will not need planning permission — but you may still want a Lawful Development Certificate to prove it.
| # | Rule |
|---|---|
| 1 | Maximum external footprint 3m². |
| 2 | Maximum height 3m. |
| 3 | Must be at least 2m from any boundary fronting a highway. |
| 4 | Applies to the original door — a porch can only be added once under PD. |
| 5 | In conservation areas, porches on front elevations are carefully assessed. |
When You Will Need Full Planning Permission
These are the common reasons a porch loses the permitted development route in London and needs a full householder application instead.
Conservation areas review porches for street-scene impact
Listed buildings require listed building consent for any porch
Flats are not eligible for porch PD
Porch Planning by London Borough
Planning outcomes vary significantly by borough. Conservation area coverage is the single biggest driver — boroughs with heavy CA coverage tend to see more porch proposals need a full application.
How to Apply for Planning Permission
- 1Size check
Confirm the porch design is under 3m² footprint, 3m high and 2m from any highway boundary.
- 2Materials
Choose brick, timber or render that matches the existing house to reduce objections.
- 3Conservation check
Check whether an Article 4 removes PD for porches at your address.
- 4Build or apply
Proceed without a planning application if PD applies, otherwise submit a householder application.
Typical Costs and Timeframes
Project cost
£3,000–£12,000
London range; varies with specification and site.
Planning fee
£258
Householder application fee (2026). LDC fee is £129.
Decision time
8 weeks
Statutory target for householder applications.
Frequently Asked Questions
Can I add a porch to a flat without planning permission?
No — PD rights for porches apply only to houses. Flats need a full application plus landlord or freeholder consent.
Are porches allowed in conservation areas under permitted development?
Yes in principle, within the standard size limits, but Article 4 directions in some conservation areas remove this right. Councils scrutinise the design and materials where PD does apply.
Does a porch need Building Regulations approval?
Small porches under 30m² with an external door that remains in place are usually exempt from Building Regulations provided glazing meets safety standards and there is no new heating.
Next step
Check if your specific project needs permission
Enter your address and your porch details. We combine PD rules, address-level constraints and nearby precedent decisions for an answer in 60 seconds.