If you’ve been thinking about extending your home, converting your garage, or adding a garden room, you’ve probably come across the term permitted development. But what exactly does it mean — and how do you know if your project qualifies?
This guide explains everything UK homeowners need to know about permitted development rights, including what you can build, where the limits are, and the one document that protects you if there’s ever a dispute.
Permitted development (commonly abbreviated to PD) refers to a set of rights granted to homeowners in England and Wales that allow certain types of building work to be carried out without the need for a formal planning application.
These rights are set out in the Town and Country Planning (General Permitted Development) (England) Order 2015 — a piece of legislation that defines exactly what types of work qualify, what the size limits are, and where restrictions apply.
In simple terms: if your project falls within the permitted development rules, you can build it without asking your local council for permission.
This is significant. A standard planning application takes 8 weeks (sometimes longer), costs money, and can be refused. Permitted development removes that uncertainty for many common home improvement projects.
Permitted development covers a wide range of projects. The most common include:
Rear extensions — Single storey rear extensions can extend up to 6 metres from the original rear wall (or 8 metres for detached houses) under the Neighbour Consultation Scheme. Standard PD limits are 3 metres for semi-detached and terraced homes, 4 metres for detached.
Side extensions — A single storey side extension can be built under PD provided it is no wider than half the width of the original house.
Loft conversions — You can add up to 40 cubic metres of additional roof space for terraced houses, or 50 cubic metres for detached and semi-detached homes, without planning permission.
Porch extensions — Porches can be added to the front of your home under PD, provided the ground floor area does not exceed 3 square metres and the height does not exceed 3 metres.
Garage conversions — Converting an attached or integral garage into habitable space typically falls under permitted development, provided the exterior appearance of the building is not significantly altered.
Garden rooms and outbuildings — Sheds, home offices, garden rooms, and other outbuildings can be built in the garden under PD, subject to height and proximity-to-boundary rules.
Conservation areas — If your home is in a designated conservation area, Article 4 Direction area, or World Heritage Site, your PD rights are significantly reduced.
Listed buildings — If your home is a listed building, permitted development does not apply. You will need listed building consent for most types of work.
Article 4 Directions — Local planning authorities can remove PD rights in specific areas by issuing an Article 4 Direction.
Flats and maisonettes — Permitted development rights apply to houses, not flats. If you live in a flat or maisonette, you will generally need planning permission for any extension or alteration.
New build properties — Some newer developments have conditions attached to their planning permission that remove or restrict PD rights.
Even if your project qualifies as permitted development, you don’t need any documentation to proceed — but it is strongly advisable to obtain a Lawful Development Certificate (LDC). An LDC is a formal decision from your local planning authority confirming that your project is lawful under PD rules.
You apply for an LDC through your local council’s planning portal. The process typically takes 8 weeks and costs around £206 (for works to a dwelling house in England, as of 2024).
| Permitted Development | Planning Permission | |
|---|---|---|
| Application required | No | Yes |
| Council decision needed | No (unless LDC) | Yes |
| Typical timeframe | Immediate (8 weeks for LDC) | 8–13 weeks |
| Cost | Free (or ~£206 for LDC) | £258+ |
| Risk of refusal | None (if within rules) | Yes |
Even though you don’t need planning permission for a PD project, you will still need building regulations approval before construction starts. For building regulations approval, you will need a full set of architectural drawings.
At Permitted Development, we produce fully compliant PD architectural drawings for extensions, garages, porches, and loft conversions — designed to meet UK building regulations and verified against the latest PD rules. Our drawings are available as instant digital downloads.
No. Permitted development allows you to carry out certain building work without applying for planning permission, provided the work stays within the defined rules.
Check the current size limits and conditions for your project type. If in doubt, apply for a Lawful Development Certificate through your local council, or speak to a planning consultant.
Yes. Local councils can remove PD rights in specific areas through an Article 4 Direction. Conservation areas and listed buildings also have reduced or no PD rights.
No. PD rights apply to houses only. Flats and maisonettes generally require full planning permission for any alterations.
Some larger projects — such as rear extensions beyond the standard PD limits — require “prior approval” from the council before work begins. This is a lighter process than full planning permission but does require a formal application.
Ready to get started? Browse our permitted development drawing packages — compliant, instant download, and fixed price.
Maximize your property’s footprint with precision and ease. Permitted provides complete design for Permitted Development Rights, ensuring your project meets all national requirements while bypassing the lengthy full planning permission process.
