Homeowner Guide June 5, 2026 4 min read
Permitted Development Rights Explained: A 2026 Guide for Homeowners
What permitted development means, the classes that matter to homeowners, and the 2026 limits for extensions, lofts, outbuildings, and driveways, with the exclusions to watch.
What permitted development means
Permitted development is planning permission granted in advance by national law, the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended). It lets homeowners carry out many common projects without a planning application, provided the work meets a set of conditions on size, height, position, and materials. Stay inside the conditions and you do not need to apply. Step outside them, or trigger an exclusion, and you need householder planning permission.
A Homeowner Planning Review checks which of these rights apply to your specific property for £249, before you design or buy.
The permitted development classes that matter to homeowners
| Class | What it covers |
|---|---|
| Class A | Extensions and enlargements of the house |
| Class B | Additions to the roof that enlarge it, such as loft conversions with dormers |
| Class C | Other roof alterations, such as re-roofing and roof lights or skylights |
| Class D | Porches outside an external door |
| Class E | Outbuildings and structures in the garden, such as garden rooms, sheds, garages, and pools |
| Class F | Hard surfaces, such as driveways and patios |
Class A: extensions
Class A covers extending the house. The headline limits for single-storey rear extensions are 4 metres for a detached house and 3 metres for a semi-detached or terraced house, with deeper projections of 8 and 6 metres available through the Larger Home Extension prior-approval scheme. We cover extensions in full in our guide to planning permission for extensions.
Class B and C: lofts and roofs
Loft conversions that enlarge the roof, such as dormers, fall under Class B. The additional roof volume (including any earlier enlargement) must not exceed the original roof space by more than 40 cubic metres for a terraced house, or 50 cubic metres for any other house. The work must not extend beyond the plane of the existing roof slope on the principal elevation that fronts a highway, must not be higher than the existing roof, and must use materials similar in appearance to the existing house. Side-facing windows must be obscure-glazed and, if they open, at least 1.7 metres above the floor. The enlargement should be set back at least 20 centimetres from the original eaves, and verandas, balconies, and raised platforms are not allowed. Class B is removed entirely on designated land. Class C covers lighter roof alterations such as re-roofing and roof lights.
Class E: outbuildings and garden rooms
A garden room, shed, garage, or home office can be permitted development under Class E if it is single storey, with a maximum overall height of 4 metres for a dual-pitched roof or 3 metres for any other roof, and a maximum eaves height of 2.5 metres. Within 2 metres of a boundary, the maximum overall height drops to 2.5 metres. The building must not sit forward of the principal elevation of the house, and it must be for a purpose incidental to the enjoyment of the home, so a self-contained dwelling or somewhere to let out is not covered. Verandas and balconies are not allowed, and a raised platform must not exceed 0.3 metres. On designated land, buildings more than 20 metres from the house are limited to 10 square metres.
Class F: driveways and hard surfaces
Replacing or laying a driveway is usually permitted development if you use porous or permeable materials, or if you direct rainwater to a permeable area within your property. If you lay more than 5 square metres of non-permeable hard surfacing between the front of your house and the highway, and do not manage the rainwater this way, you need planning permission. This rule exists to reduce surface-water flooding.
The 50 per cent rule applies across everything
No more than half the area of land around the original house may be covered by extensions and outbuildings combined. Work a previous owner carried out counts towards that total, so check what has already been built before you plan more.
When permitted development does not apply
- Flats and maisonettes do not benefit from these householder rights.
- Listed buildings usually need listed building consent, and many alterations are caught.
- Designated land (conservation areas, Areas of Outstanding Natural Beauty, National Parks, the Broads, and World Heritage Sites) reduces or removes several rights.
- Article 4 directions can remove specific rights across a defined area.
- Planning conditions on the original permission often remove permitted development rights on newer or converted homes.
How to prove your project is permitted development
If you want certainty, apply to your council for a Lawful Development Certificate. It confirms in writing that the work is lawful permitted development, which is reassuring during the project and useful evidence when you sell.
Check your property first
Permitted development rights vary by property and location, and the exclusions are easy to miss. A Homeowner Planning Review checks the designations and planning history on your home for £249 in 48 hours, in plain English, and you can read how we verify every report before you order.
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