Permitted Development (PD) is the national permission that lets you build certain extensions without a full planning application. Used correctly, it saves 12 weeks and over £3,000 in planning fees and architect work. Used carelessly, it can leave you with an unauthorised build that affects your property value and resale. Here is what every homeowner needs to know.
The key PD limits for rear extensions
For a single-storey rear extension to fall under PD, all of these must apply:
- Detached house: extends no more than 4m beyond the original rear wall
- Semi-detached or terrace: extends no more than 3m beyond the original rear wall
- Maximum height: 4m at the highest point
- Eaves height within 2m of a boundary: maximum 3m
- Materials similar in appearance to the existing house
- No verandas, balconies, or raised platforms
The Larger Home Extension scheme
The Larger Home Extension scheme allows single-storey rear extensions up to 8m (detached) or 6m (semi/terrace). It is not full planning, but it does require:
- 1.Submitting a Prior Approval application to your local authority
- 2.A 42-day consultation period where neighbours can object
- 3.The council can refuse on grounds of impact on neighbour amenity
PD limits for side extensions
Side extensions under PD are tightly limited:
- Single storey only
- No higher than 4m
- No wider than half the width of the original house
- Materials must match
- In some designated areas, side extensions need full planning regardless of size
When PD rights do NOT apply
PD rights are removed in many circumstances:
- Listed buildings — always need Listed Building Consent
- Conservation areas — many PD rights are restricted
- Article 4 directions — local authorities can remove PD rights for specific areas
- Flats and maisonettes — PD rights for extensions do not apply
- Some Areas of Outstanding Natural Beauty (AONBs) and National Parks
Why you should get a Lawful Development Certificate
Even if your build genuinely falls under PD, we strongly recommend applying for a Lawful Development Certificate (LDC) from your local council. The LDC formally confirms the build was lawful — without it, you may face problems at resale or struggle to insure properly. LDC fees in Worcestershire are typically £103, half the cost of a full planning application.
How JCT Building helps
On every project we deliver, we assess whether your build falls under PD or needs planning, and we explain the implications clearly. We work regularly with Wyre Forest, Bromsgrove, Worcester, Wychavon, Malvern Hills, and Dudley councils — and can coordinate with local architects and planning consultants when needed.
Want to know if your project qualifies?
Book a free site visit and we will give you a clear answer on whether your extension can be built under PD or needs full planning. Call 07769 225120.
