Understanding permitted development rights shouldn’t be a headache.
But if you’re planning an extension, loft conversion, garage conversion or other home improvement, working out what you can build without planning permission can quickly become confusing.
Permitted development rights allow many homeowners in England to carry out certain types of building work without making a full planning application. However, there are important limits, conditions and exceptions you need to know about before work begins.
In this guide, we explain permitted development rights in 2026, including how far you can extend without planning permission, when prior approval is needed and whether you should apply for a Lawful Development Certificate.
This guide covers:
- What counts as permitted development in 2026
- How far you can extend without planning permission
- Permitted development rules for extensions and loft conversions
- When you need prior approval
- When to apply for a Lawful Development Certificate
- Permitted development rules for building upwards
- Where permitted development rights may be restricted
- How to find the right professional for your project
Permitted development rights at a glance
In England, permitted development rights allow certain types of building work and changes of use to take place without a full planning application, provided the work meets the relevant conditions and limitations.
The rules are set out principally in the Town and Country Planning (General Permitted Development) (England) Order 2015, commonly known as the GPDO.
However, permitted development doesn’t mean you can simply start building.
As the homeowner, you’re responsible for making sure your proposed work qualifies as permitted development. You should also check whether any additional restrictions apply to your property or area before construction starts.
And remember: permitted development relates to planning permission. You may still need Building Regulations approval and, depending on the work, you may also have obligations under the Party Wall etc. Act 1996.
What are permitted development rights?
Permitted development rights give homeowners the ability to carry out certain alterations and extensions without applying for full planning permission.
Think of them as a national planning permission granted in advance – but only when your project stays within specific rules.
These rules cover factors such as:
- The size and height of an extension
- How far an extension projects from the original house
- The position of the extension
- The amount of land covered by buildings
- The materials being used
- The location and type of property
- Previous alterations and extensions
Some projects also require prior approval from your local planning authority before work can begin.
Extra restrictions can apply to properties in conservation areas and other designated land, while listed buildings are subject to separate listed building controls.
That’s why it’s sensible to speak to an architect, planning consultant or experienced builder before starting major work.
What can you build under permitted development?
So, what can you build without planning permission?
Depending on your property, its location and the proposed work, permitted development rights can potentially cover projects including:
- Single and double-storey extensions
- Certain larger rear extensions, subject to prior approval
- Loft conversions and roof alterations
- Garage conversions
- Porches
- Outbuildings, sheds and garages
- Certain new storeys added to existing homes
- Driveways and other hard surfaces
- Certain solar panel installations
- Some chimneys, flues and soil or vent pipes
- Certain satellite dishes and antennas
Each category has its own permitted development rules, limits and conditions.
Just because a type of project can fall under permitted development doesn’t mean your particular project automatically qualifies.
TOP TIP: Before starting work, check both planning requirements and Building Regulations. Party Wall requirements may also apply where work affects a shared wall or is being carried out close to a neighbouring property.
How far can you extend without planning permission?
One of the most common questions homeowners ask is: “How big can I build without planning permission?”
For a standard single-storey rear extension under permitted development, the usual maximum projection from the rear wall of the original house is:
- Detached house: up to 4 metres
- Semi-detached or terraced house: up to 3 metres
Subject to additional requirements, larger single-storey rear extensions may be possible through the prior approval process:
- Detached house: over 4 metres and up to 8 metres
- All other houses: over 3 metres and up to 6 metres
A single-storey rear extension must also meet other conditions. For example, it cannot normally exceed 4 metres in overall height.
Other restrictions apply to eaves, boundaries, materials and the amount of land around the original house that can be covered.
Importantly, the measurements relate to the original house – broadly, the property as it was originally built or as it stood on 1 July 1948 if it was built before that date.
That means an extension added by a previous owner can affect how much further you’re allowed to extend.
Do I need prior approval for a larger home extension?
Potentially, yes.
If you want to take advantage of the larger rear-extension limits of up to 8 metres for a detached house or 6 metres for other houses, you’ll normally need to use the prior approval process.
Your local planning authority will notify adjoining neighbours of your proposed development. If concerns or objections are received, the council may need to consider the impact of the extension on neighbouring properties before deciding whether it can proceed.
You must complete the required process before starting work.
As of 1 April 2026, the national fee for this type of householder prior approval application is £249.
What is a Lawful Development Certificate?
Even if your proposed project appears to fall within permitted development rights, you might want formal confirmation from your local planning authority.
That’s where a Lawful Development Certificate (LDC) can help.
A Lawful Development Certificate provides formal confirmation that a proposed or existing development is lawful for planning purposes.
An LDC isn’t the same as planning permission and isn’t compulsory simply because you’re carrying out permitted development.
However, applying for one can be worthwhile if:
- You’re unsure whether your project meets permitted development rules
- You want formal evidence that planning permission wasn’t required
- You’re planning to sell or remortgage the property
- You want greater certainty before investing in construction
Your architect, planning consultant or builder may recommend applying for a Lawful Development Certificate before work starts, particularly for larger or more complicated projects.
Do loft conversions come under permitted development?
Many loft conversions can be completed under permitted development rights, provided they stay within the relevant limits and conditions.
The rules are different from those covering ground-floor extensions and include limits on the additional roof space that can be created.
Other restrictions relate to matters such as the height of the roof extension, its position, materials, balconies and the treatment of certain windows.
If you’re considering converting your loft, check the permitted development rules at the design stage rather than assuming that every loft conversion is automatically covered.
Can you add another storey under permitted development?
In some circumstances, yes.
Permitted development rights introduced in 2020 made it possible for certain buildings to be extended upwards, subject to detailed conditions and the prior approval process.
These rights cover several different types of building, so the rules depend heavily on what you’re extending.
Adding storeys to an existing house
Certain detached, semi-detached and terraced houses may be able to add additional storeys under permitted development.
Depending on the existing building, this can include:
- Up to two additional storeys on certain houses that already have two or more storeys
- One additional storey on certain single-storey homes
Height limits, construction dates and other restrictions apply.
Prior approval is required, and your local planning authority can consider specified matters before the development proceeds.
Adding new homes above existing buildings
Separate permitted development rights can allow additional storeys to be constructed above certain blocks of flats and commercial or mixed-use buildings to create new homes.
Again, these rights are highly conditional and shouldn’t be treated as an automatic right to build upwards.
If you’re considering adding a storey to a house, block of flats or commercial building, professional planning advice is strongly recommended.
What are the benefits of permitted development rights?
Permitted development can make some home improvement projects simpler by removing the need to submit a full planning application.
Potential benefits include:
- A more streamlined planning process
- Greater certainty for projects that clearly meet the rules
- Opportunities to extend or improve existing homes
- The potential to create additional living space without a full planning application
- Opportunities for certain buildings to be extended upwards
- Support for making better use of existing buildings and previously developed land
However, permitted development isn’t necessarily the best route for every project.
A full planning application can sometimes give you greater design flexibility than trying to make a project fit within permitted development limits.
When do permitted development rights not apply?
One of the biggest mistakes homeowners make is assuming that permitted development rights apply equally to every property.
They don’t.
There are several situations where your rights may be different, restricted or removed entirely.
Flats and maisonettes
Many of the householder permitted development rights used for extensions and other alterations apply to houses rather than flats or maisonettes.
If you own a flat or maisonette, don’t assume that you have the same permitted development rights as someone who owns a house.
Conservation areas and designated land
Additional restrictions can apply in conservation areas and other designated locations.
This doesn’t necessarily mean that all permitted development rights disappear, but some types of work that would be permitted elsewhere may require planning permission.
Listed buildings
If you own a listed building, additional controls apply.
Even where planning permission isn’t required, you may need listed building consent for work affecting the building’s special architectural or historic interest.
Article 4 directions
Your local planning authority can introduce an Article 4 direction that removes specified permitted development rights within a particular area.
This means a project that would ordinarily be permitted development may require planning permission.
Article 4 directions are often used where councils consider additional planning controls necessary, including in some conservation areas.
Planning conditions
Planning permission previously granted for your property may contain conditions restricting or removing certain permitted development rights.
It’s therefore important to check the property’s planning history.
Previous extensions
Previous extensions and alterations can also affect what you’re allowed to build.
Permitted development calculations often relate to the original house, rather than simply the property as it looks today.
That means work carried out decades ago – including work completed by a previous owner – could affect your current proposal.
Does permitted development mean I don’t need Building Regulations?
No.
This is an important distinction.
Planning permission and Building Regulations are separate systems.
Your extension or conversion might qualify as permitted development for planning purposes but still need Building Regulations approval.
Building Regulations cover areas including:
- Structural safety
- Fire safety
- Insulation and energy efficiency
- Ventilation
- Drainage
- Electrical safety
- Staircases and access
Depending on the project, you may also need to consider the Party Wall etc. Act and other legal requirements.
Should I apply for permitted development or planning permission?
Strictly speaking, you don’t normally “apply for permitted development” in the same way you apply for full planning permission.
Your project either falls within the relevant permitted development rights or it doesn’t.
However, you may need to submit a prior approval application for certain types of development, and you can apply for a Lawful Development Certificate to establish formally that your proposal is lawful.
If your plans exceed permitted development limits, you may need to make a full planning application instead.
In some cases, submitting a planning application may also allow you to pursue a design that better suits your home rather than compromising the project simply to stay within permitted development rules.
How do I check my permitted development rights?
Before starting any building work, take the time to check the rules that apply to your specific property.
You should:
- Check the current permitted development rules for your type of project.
- Look at your property’s planning history, including previous extensions.
- Check whether you live in a conservation area or other designated land.
- Find out whether an Article 4 direction affects your property.
- Check whether previous planning permissions contain restrictive conditions.
- Speak to your local planning authority if you’re unsure.
- Consider asking an architect or planning consultant to assess the proposal.
- Apply for a Lawful Development Certificate where you want formal confirmation.
Don’t rely solely on the fact that a neighbour has completed a similar extension. Their property, planning history or permitted development rights may be different from yours.
Find an experienced professional for your permitted development project
Permitted development can save you from making a full planning application, but only when your project complies with all the relevant rules.
Getting professional advice early can help you avoid expensive redesigns, delays or planning problems once construction has started.
Depending on your project, you may want help from an:
- Architect
- Architectural technologist
- Planning consultant
- Structural engineer
- Builder experienced in permitted development projects
Whether you’re planning a rear extension, loft conversion, garage conversion or additional storey, finding an experienced professional can help you understand what you can build and which approvals you’ll need.
Permitted development rights 2026: FAQs
What is permitted development?
Permitted development refers to certain types of development that can be carried out without making a full planning application, provided the proposal meets the relevant limits, conditions and restrictions.
How far can I extend without planning permission?
For a single-storey rear extension, standard permitted development limits are generally up to 4 metres for a detached house and 3 metres for other houses. Subject to prior approval and other conditions, larger rear extensions can potentially reach 8 metres for detached houses and 6 metres for other houses.
Do I need planning permission for a 6-metre rear extension?
Not necessarily. A 6-metre single-storey rear extension may qualify under the larger home extension permitted development rules, depending on the property and proposal. However, the prior approval process applies, and all relevant conditions must be satisfied.
Do I need a Lawful Development Certificate?
A Lawful Development Certificate isn’t automatically compulsory for permitted development. However, it can provide valuable formal confirmation that your proposed development is lawful for planning purposes.
Do permitted development rights apply to flats?
Many of the permitted development rights available to householders apply specifically to houses and do not apply to flats and maisonettes in the same way. Different permitted development provisions may apply to certain buildings and changes of use.
Can permitted development rights be removed?
Yes. Permitted development rights can be restricted by factors including Article 4 directions and planning conditions. Additional restrictions also apply to certain properties and designated areas.
Does permitted development need Building Regulations approval?
Potentially, yes. Permitted development relates to the planning system and doesn’t remove the need to comply with Building Regulations or other applicable legal requirements.
Key takeaway
Permitted development rights can allow you to extend or improve your home without full planning permission – but they aren’t a blanket permission to build.
The rules depend on your property, the work you’re proposing, previous development and any local restrictions.
Check your permitted development rights before work starts and, where there’s any uncertainty, get advice from your local planning authority or an experienced planning professional.
Planning an extension? Explore the project before you commit.
The BetterPlanHomes Rear Extension Pack brings together practical guidance on planning considerations, indicative costs, design decisions, common risks and the next steps to consider before progressing with your project.