At a glance
Category
Planning & Legal
Who this guide is for
Homeowners considering building work
Planning permission
Not required if the rules are met
Building Regulations
Usually still required separately
Difficulty
Beginner
Reading time
9–11 minutes
Quick answer
What are Permitted Development Rights?
Permitted Development Rights are a national grant of planning permission that allow certain building works and changes of use to proceed without a full planning application.
They only apply if the proposal meets every relevant limit and condition set out in the legislation.
Common projects that may fall within Permitted Development include:
- Modest single-storey rear extensions.
- Certain loft conversions.
- Porches within specified limits.
- Outbuildings such as garden rooms and sheds.
- Some alterations to windows, doors and roof coverings.
- Solar panels in appropriate locations.
What Are Permitted Development Rights?
Permitted Development Rights (PDRs) come from national planning legislation. They set out categories of development that are granted planning permission automatically, provided the work stays within defined limits and conditions.
The intention is to make routine, low-impact projects easier for homeowners without removing local planning control over larger or more sensitive development.
PDRs cover a wide range of works, including extensions, roof alterations, outbuildings, hard surfaces, minor external alterations and some changes of use.
How Permitted Development Works
PDRs operate as a set of tests. If the proposal meets every applicable limit and condition, planning permission is deemed to have been granted.
If the proposal fails any single test, the rights do not apply and a planning application is required.
The key points to understand are:
- Every category has its own rules.
- Rules apply to the whole property, not just the new work.
- Previous extensions and alterations may reduce what remains available.
- Rights can be restricted by planning conditions on earlier approvals.
- Rights can be removed altogether in some areas.
Common Categories of Permitted Development
Single-Storey Rear Extensions
Modest single-storey extensions to the rear of a house may fall within Permitted Development where they meet the rules on depth, height and eaves.
Two-Storey Rear Extensions
Two-storey rear extensions can also fall within Permitted Development on certain houses, subject to tighter controls on depth, distance from boundaries and window positions.
Loft Conversions and Roof Additions
Some loft conversions are permitted where they stay within a defined volume allowance and do not extend beyond the plane of the existing roof slope facing a highway.
Porches
Small porches added to any external door may be permitted where they meet limits on floor area, height and distance from the highway.
Outbuildings
Garden rooms, sheds, garages and similar outbuildings can be permitted where they are incidental to the enjoyment of the house and comply with rules on height, position and site coverage.
External Alterations
Certain replacement windows, doors, roof coverings, chimneys, flues and rooflights may be permitted, subject to design and position controls.
Solar Panels and Microgeneration
Solar panels, air source heat pumps and similar equipment may be permitted where they meet the technical and siting rules.
Hard Surfaces
New driveways and hard surfaces can be permitted where they use porous materials or drain onto a permeable area.
Typical Limits to Watch
Although each category is different, the limits below appear repeatedly and are the most common reason projects fall outside Permitted Development.
| Limit | What it controls |
|---|---|
| Height | Overall height, eaves height and ridge height. |
| Depth | How far an extension projects from the original wall. |
| Position | Distance from boundaries and relationship to the highway. |
| Coverage | Total area of outbuildings and extensions on the plot. |
| Materials | Whether external finishes match the existing house. |
| Windows | Position, obscure glazing and side-facing openings. |
Where Permitted Development Is Restricted
Some properties do not benefit from the full set of householder Permitted Development Rights, or have them removed altogether.
Restrictions commonly apply where:
- The property is a flat or maisonette.
- The building is listed.
- The property lies within a conservation area.
- The property is in a National Park, Area of Outstanding Natural Beauty, National Landscape, the Broads or a World Heritage Site.
- An Article 4 Direction has been made.
- A previous planning permission removed specific rights by condition.
- The property was created through a conversion with restricted rights.
In these situations, work that would normally be permitted elsewhere may require a full planning application.
Prior Approval
Some Permitted Development categories require the Local Planning Authority to consider specific matters before work begins. This is known as prior approval.
It is not the same as a full planning application, but development cannot proceed until the process has been completed.
Prior approval may consider matters such as:
- Impact on neighbouring amenity.
- Highways and transport.
- Flood risk and contamination.
- External appearance.
- Noise.
The exact requirements depend on the type of development.
BuildGuide Example
Garden Room in a Suburban Semi
Ravi wants to build a garden room at the bottom of his rear garden to use as a home office.
His designer checks:
- The overall height stays within the outbuilding rules.
- The building sits well away from all boundaries.
- The total area of outbuildings does not exceed half the garden.
- The property is not in a conservation area or Article 4 zone.
- No previous approvals have removed outbuilding rights.
The proposal appears to comply with Class E of the householder Permitted Development Order.
Ravi applies for a Lawful Development Certificate before construction to confirm the work is lawful, and submits a separate Building Regulations application because the garden room includes sleeping accommodation for occasional guests.
How to Check Whether Your Project Qualifies
Use the following process.
1. Define the Project
Record the size, height, position, materials and intended use in detail.
2. Check the Property Type
Confirm whether it is a house, flat or maisonette, and whether it is listed.
3. Check the Location
Establish whether the property is in a conservation area, National Park, AONB, National Landscape or affected by an Article 4 Direction.
4. Review the Planning History
Look at any previous approvals or conditions that may reduce or remove Permitted Development Rights.
5. Compare Against the Relevant Class
Match the proposal against every applicable limit and condition for the correct class of Permitted Development.
6. Consider a Lawful Development Certificate
Where the project relies on detailed rules, apply for an LDC to obtain formal written confirmation before starting work.
Permitted Development and Building Regulations
Permitted Development only concerns planning. Building Regulations are a separate technical approval covering matters such as structure, insulation, ventilation, drainage, fire safety and electrical work.
Most extensions, loft conversions and habitable outbuildings require Building Regulations approval even where planning permission is not required.
Common Mistakes
Warning · Common mistake
Assuming All Houses Have the Same Rights
Flats, maisonettes and houses in protected areas do not benefit from the same rights as a standard house in an unrestricted location.
Warning · Common mistake
Forgetting Previous Extensions
Earlier additions to the original house often count towards your remaining allowance and can push a proposal outside Permitted Development.
Warning · Common mistake
Missing an Article 4 Direction
Article 4 Directions can remove rights that would otherwise apply. Always check with the Local Planning Authority.
Warning · Common mistake
Relying on Verbal Advice
Informal reassurance from a neighbour, builder or council officer is not a substitute for a written Lawful Development Certificate.
Warning · Common mistake
Ignoring Building Regulations
Falling within Permitted Development does not exempt a project from separate Building Regulations approval.
Before You Start Checklist
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Frequently asked questions
Ask Mason
Ask Mason about permitted development rights explained
Not sure whether your project qualifies as Permitted Development?
Tell Mason:
- What type of property you own.
- What you want to build and its approximate dimensions.
- Where the work will be positioned on the plot.
- Whether the property is listed, in a conservation area or subject to an Article 4 Direction.
- Any previous extensions or outbuildings.
Mason can explain the relevant rules, flag the tests your proposal must meet and point you to the most useful BuildGuide guides.
Mason cannot provide a formal planning determination or replace advice from your Local Planning Authority or a suitably qualified professional.
Disclaimer
This guide provides general information for homeowners in England. Permitted Development Rights depend on the property, location, planning history and legislation in force at the time. Always confirm the requirements for your project with the Local Planning Authority or a suitably qualified professional before starting work.