Permitted Development Rights Explained

Permitted development (PD) rights grant planning permission for certain types of work automatically, provided you stay within nationally set limits. They are the reason many homeowners can extend or add an outbuilding without applying — but the conditions are detailed, and getting them wrong turns a "permitted" project into unauthorised development.

Common permitted development projects

• Rear extensions — single-storey rear extensions are permitted up to set depth and height limits (larger sizes may be possible under the "prior approval" neighbour-consultation route).
• Outbuildings — sheds, home offices and garden rooms are permitted within height and footprint limits, provided they are incidental to the house and not used as a separate dwelling.
• Loft conversions — permitted within a volume allowance, but dormers on the principal elevation facing a road are not, and rooflights must sit within set limits.
• Porches, hard surfaces and some solar panels — generally permitted within limits.

When PD rights do not apply

PD rights are restricted or removed in conservation areas, on listed buildings, in National Parks and Areas of Outstanding Natural Beauty, on flats and maisonettes (most PD applies only to houses), and where the council has issued an Article 4 direction removing specific rights for an area. New-build estates sometimes have PD rights removed by a planning condition, so always check the original permission.

Prove it: Lawful Development Certificates

Because PD limits are easy to misjudge, the safest course for anything close to the limits is a Lawful Development Certificate (LDC). It is a formal council decision confirming your project is lawful. It costs less than a full application, gives you certainty before you build, and is exactly the document a buyer's solicitor will ask for later.