Permitted development extension rules explained
The short answer
Permitted development is planning permission granted nationally for certain kinds of work, so a planning application is not required when the work stays inside the published limitations and meets the published conditions. It is not automatic and it is not universal: rights vary by property type and location, can be reduced in designated areas, and can be withdrawn by an Article 4 direction or by a planning condition.
Key points
- Permitted development is a grant of planning permission with strings attached, not an exemption from planning.
- Each class of permitted development has its own limitations and conditions.
- Flats, maisonettes, listed buildings and some converted properties do not have the same householder rights.
- Designated areas and Article 4 directions restrict or remove rights locally.
- Some permitted development requires you to notify the council first through a prior approval process.
Published by Kezariq Ltd. See the source links below for official guidance.
What permitted development actually means
Rather than requiring every homeowner to apply for planning permission for routine work, national legislation grants permission in advance for defined categories of development. If your proposal genuinely falls within one of those categories, you do not need to submit a planning application for it.
The catch is the word 'genuinely'. The categories are defined precisely, and a proposal that misses one limitation by a small margin is not permitted development at all.
Rights are subject to limitations and conditions
Limitations describe what the work can be — things like extent, height, position relative to boundaries and the treatment of the roof. Conditions describe what you must do — for example matching materials, or restrictions on how a resulting space can be used.
These figures are technical and are amended from time to time, so this guide points you at the maintained source rather than repeating numbers that may be out of date or may not apply to your property. The Planning Portal sets out the current position for common householder projects.
Common reasons rights may be restricted or unavailable
- The property is a flat or maisonette rather than a house.
- The dwelling was created by a conversion or under a permitted development right, which can carry conditions removing further rights.
- The building is listed, or the work would affect its special interest.
- A planning condition on an earlier approval removed householder permitted development rights — common on newer estates.
- Earlier extensions have already used up the allowance available to the property.
Designated areas
In conservation areas, national parks, National Landscapes (formerly Areas of Outstanding Natural Beauty), the Broads and World Heritage Sites, permitted development is tighter than elsewhere. Certain types of work that would be permitted development on an ordinary suburban house require a planning application in a designated area.
Article 4 directions
An Article 4 direction is made by the local planning authority and withdraws specified permitted development rights within a defined area. They are frequently used in conservation areas to control alterations such as windows, roofs, front elevations and boundary treatments.
There is no national list you can rely on for your street: check your own council's website, or ask them directly.
Prior approval at a high level
Some permitted development is only available if you first tell the council and they consider specified matters — this is called prior approval. The larger single-storey rear extension route for houses is the example most homeowners encounter, and it involves a neighbour consultation step.
Prior approval is not the same as a full planning application, but it is a formal process with deadlines. If your project depends on it, confirm the current procedure with your local planning authority before you commit to a design or a build date.
Planning permission versus Building Regulations
Permitted development removes the need for a planning application. It does not remove the need for Building Regulations approval, which deals with how the work is built rather than whether it should exist.
Things to check
- Whether your property has householder permitted development rights at all.
- Whether a planning condition on a previous approval has removed them.
- Whether your address sits in a designated area.
- Whether an Article 4 direction applies locally.
- Whether your proposal relies on a prior approval process, and what that process currently requires.
- Whether a Lawful Development Certificate would give you useful written certainty before you build.
Common questions
Is permitted development the same everywhere in the UK?
No. The rules differ between England, Wales, Scotland and Northern Ireland, and are further modified locally. Always check the guidance for your nation and confirm with your own local planning authority.
Can the council take my permitted development rights away?
Yes. A local planning authority can make an Article 4 direction removing specified rights in a defined area, and rights can also be removed by a condition on a previous planning permission.
Check your project circumstances before you design around a rule
The KEZARIQ Planning Assessment records the circumstances that decide these questions — property type, designation, previous work and what you are proposing — and returns a written report of what to verify and where the risks sit. It does not grant permission or replace your council's answer.
Assessment Project Report — £10.99
Check your project circumstancesFree limited preview. No payment needed to read your preview. The full report is optional.
Important
This guide is general information for UK homeowners. It is not legal, planning, structural or professional advice, and it does not take account of your individual circumstances. Rules change and vary between England, Wales, Scotland and Northern Ireland, and by local authority.
KEZARIQ provides guidance and documents you complete and review yourself. It does not manage your project, carry out professional services, or replace an architect, surveyor, structural engineer, planning consultant or other competent professional where one is required. Nothing here guarantees planning permission, Building Regulations approval, prices, contractor performance or any project outcome. You remain responsible for your own project and decisions.