Permitted Development Rights: What Can You Build Without Planning Permission?
If you're thinking about extending or improving your home, one of the first questions you're likely to ask is: “Do I need planning permission?”
The good news is that, in many cases, homeowners in England can make certain changes to their property under Permitted Development Rights (PDR) without submitting a full planning application.
But there is an important qualification.
Permitted Development doesn't mean you can simply build whatever you like, and it doesn't mean that no other approvals or regulations apply. There are detailed planning rules covering the size, height, position and appearance of many types of development. Previous alterations to your property can also affect what you are allowed to do, while Conservation Areas, Article 4 Directions, listed buildings and planning conditions can introduce additional restrictions.
Even where planning permission isn't required, the work will still need to comply with Building Regulations where they apply. While there are some exemptions from the need for Building Regulations approval, you are still likely to need this approval for many of the types of work discussed in this guide. We'll take a closer look at Building Regulations, including when exemptions may apply, in a future blog — so keep your eyes peeled! Other requirements, such as the Party Wall etc. Act, may also need to be considered
So in other words, Permitted Development answers one particular question:
“Do I need planning permission for this work?”
It doesn't mean that you can simply start building.
Understanding the planning position, Building Regulations and any other relevant requirements before work begins is an important part of getting your project right.
At SE Addition, we specialise in extensions, conversions and additions to homes across Norfolk, Cambridgeshire and Lincolnshire. We regularly help homeowners understand what is possible, what isn't, and — perhaps most importantly — what will make the best addition to their home.
Here's our guide to the essentials. There's a lot to discuss - use the links below to jump to sections of interest:
What are PDR rights? | Extensions | Side Extensions | Two storey Extensions | Loft Conversions | Garage Conversions | Garden outbuilding | Porch | Conservation Area | Listed Houses | Previous extension impact | PDR vs Planning Permission | Building Regulations | Lawful Development Certificate | Is PDR best? | Our Approach
What are Permitted Development Rights?
Permitted Development Rights are rights granted by national planning legislation that allow certain types of development to take place without the need for a traditional planning application.
For homeowners in England, the main householder rights are set out in Part 1 of Schedule 2 of the Town and Country Planning (General Permitted Development) (England) Order 2015, commonly known as the GPDO. The government has published detailed technical guidance explaining how these rights work.
The rules cover a range of common home improvements, including certain:
extensions
loft conversions and roof alterations
porches
garden buildings and outbuildings
hard surfaces such as driveways
other alterations to a house.
The key point is that your proposal has to meet all of the relevant limitations and conditions to benefit from permitted development rights.
That's why a quick measurement or an online calculator isn't always enough to establish whether your particular project qualifies.
Can I build an extension under Permitted Development?
Often, yes.
Single-storey rear extensions are one of the most common forms of permitted development.
For a typical house in England, the standard permitted development rules allow a single-storey rear extension to project up to:
4 metres from the original rear wall of a detached house
3 metres from the original rear wall of other houses.
But those distances are only part of the story. There are additional requirements relating to height, boundaries, the amount of land covered and the relationship of the extension to the original house. Previous extensions can also affect the calculation.
There are also provisions for larger single-storey rear extensions:
up to 8 metres for a detached house
up to 6 metres for other houses.
These larger extensions are subject to the prior approval / neighbour consultation process. So while they may not require a full householder planning application, there is still a formal process with the local planning authority before work can begin.
This is why the often-heard statement “you can extend six metres without planning permission” is a little misleading.
The better question is:
“Does my particular extension meet all the requirements for Permitted Development?”
What about side extensions?
Side extensions can also benefit from permitted development rights, but the rules are more restrictive.
A side extension under the relevant PDR rules must generally be:
single storey
no more than 4 metres high
no wider than half the width of the original house.
There are further restrictions where an extension projects beyond a side elevation or combines side and rear extension elements.
This is one reason why a good measured survey and an understanding of the original house can be important before deciding what is possible.
Can I build a two-storey extension under Permitted Development?
Potentially, yes, although the rules are tighter than for a straightforward single-storey rear extension.
For example, a two-storey extension generally cannot project more than 3 metres beyond the rear wall of the original house, and there are restrictions concerning its distance from the boundary, height and relationship with neighbouring properties.
A two-storey addition also has a much greater impact on the appearance and scale of a house.
Even where a scheme might technically fit within permitted development, it is worth considering whether PDR is genuinely the best design route — or whether a planning application could allow a better response to the house and site.
Can I convert my loft under Permitted Development?
Many loft conversions can be carried out under permitted development, provided the proposal meets the relevant requirements.
The permitted development rules allow certain roof enlargements, including many dormer-style loft conversions.
There is a limit on the additional roof volume:
40 cubic metres for a terraced house
50 cubic metres for a semi-detached or detached house.
Importantly, previous roof enlargements count towards this allowance.
There are also restrictions on where roof enlargements can be located, as well as requirements relating to windows and balconies.
If you're considering a loft conversion, therefore, don't just ask how much space you have in the loft. The existing roof, previous alterations and the proposed design all need to be considered together.
Can I convert my garage without planning permission?
Garage conversions are another area where the answer is often “possibly, but check first.”
Converting an existing garage internally into additional accommodation may not require planning permission in many circumstances, particularly where you're not enlarging the building.
However, there can be planning conditions attached to the original permission for a property that restrict garage conversion.
And if the proposal is intended to create a separate dwelling rather than simply additional accommodation for the existing house, the planning position is different.
There is also a separate Building Regulations question, which is particularly important when turning an unheated garage into habitable accommodation.
So “no planning application” does not necessarily mean “no approvals or regulations”.
Can I build a garden office or outbuilding?
Garden buildings can often be constructed under permitted development.
This can include buildings such as:
garden offices
workshops
sheds
storage buildings
garages
other buildings for purposes incidental to enjoying the house.
There are, however, detailed restrictions concerning their location, size and height.
One particularly important distinction is between an incidental garden building and a separate residential unit.
The government's guidance explains that Class E can cover buildings for purposes incidental to enjoying the house, but not normal residential use such as separate self-contained accommodation or primary living accommodation comprising a bedroom, bathroom or kitchen.
So a garden office is one thing. A self-contained annexe is potentially something very different.
What about porches?
A relatively small porch can generally be built under permitted development, provided it meets the relevant limitations.
The rules include:
a maximum external ground area of 3 square metres
a maximum height of 3 metres
a requirement for the porch to be at least 2 metres from a boundary adjoining a highway.
For a straightforward entrance porch, the planning position can therefore be relatively simple.
As always, however, the actual property and proposal need to be checked against the rules.
What if my property is in a Conservation Area?
This is where things can become more complicated.
Conservation Areas are classed as Article 2(3) land for the purposes of the householder permitted development rules. Certain rights are therefore more restricted than they are elsewhere.
For example, the national guidance identifies additional restrictions affecting matters such as side extensions, roof extensions and external cladding in Conservation Areas and other designated areas.
There is also another layer to consider: Article 4 Directions.
An Article 4 Direction can remove specific permitted development rights in a defined area, meaning that work which would normally be permitted may instead require planning permission.
You need to check the particular property and the local planning context.
What if my house is listed?
Listed buildings require additional care. Listed Building Consent is separate from planning permission. So even where a piece of work might otherwise benefit from permitted development rights, you should not assume that you can proceed without checking whether Listed Building Consent or another form of approval is required.
If you're considering alterations to a listed property, specialist advice should be obtained before work begins.
Does my previous extension matter?
Yes — and this is one of the easiest things to overlook.
Permitted development calculations aren't necessarily based simply on what you're proposing to build today.
Previous extensions can affect the amount of development available, and previous roof enlargements can count towards the loft conversion volume allowance. The concept of the “original house” is also important when applying the rules.
This means two houses that look almost identical from the outside can have completely different permitted development opportunities because one has already been extended.
Looking at the property's planning history can therefore be an important part of establishing what is possible.
What is the difference between Permitted Development and Planning Permission?
It can help to think about the two routes like this:
Permitted Development
You are working within a set of nationally defined rules and limitations.
If your proposal meets all of those requirements, a full planning application may not be necessary.
Planning Permission
You are asking the local planning authority to consider a proposal that falls outside those permitted development rights.
Neither route is automatically better. The right choice depends on the property and what you want to achieve. A modest extension may fit beautifully within PDR.
A more ambitious project may benefit from a planning application because it gives your architect greater freedom to respond to the site, the existing building and your brief.
And what about Building Regulations?
This is an important distinction.
Planning permission and Building Regulations are not the same thing.
A project can be permitted development from a planning perspective and still require Building Regulations approval.
Building Regulations deal with the technical performance and safety of the building, including matters such as:
structural stability
fire safety
insulation
ventilation
drainage
energy efficiency.
The government's PDR guidance specifically states that permitted development rights do not remove requirements under other regimes such as Building Regulations and the Party Wall Act.
So PDR answers one question:
“Do I need planning permission?”
It doesn't answer every question about what you need to do before you build.
Can I get confirmation that my project is Permitted Development?
Yes. If there is uncertainty, you can apply to the local planning authority for a Lawful Development Certificate.
For a proposed project, this can provide formal confirmation that the development is lawful under permitted development rights. The government guidance specifically recommends seeking advice from the local planning authority where there is doubt.
This can be particularly useful where a project is close to one of the permitted development limits or where you want a clear record of the planning position.
Is Permitted Development always the best option?
Not necessarily. This is perhaps the most important point for homeowners to understand.
It's tempting to think: “If I can do it under Permitted Development, that's automatically the best route.” But good architecture isn't about squeezing a project into a set of planning rules.
It's about finding the best solution for your home, your site and the way you want to live.
Sometimes PDR provides an excellent route to achieving that.
Sometimes the additional design freedom offered by a planning application produces a significantly better result.
You might want:
a larger extension
a more ambitious roof form
larger openings
a different relationship with the garden
a two-storey addition
a more contemporary architectural response.
In those situations, it can be worth stepping back and asking what the best design is before deciding which planning route to take.
How we approach Permitted Development at SE Addition
When we look at a potential extension or addition, we don't start with just one question:
“Can we get this under PDR?”
We start by understanding the property and what you want from it.
That means considering:
The existing house and site.
Previous extensions and alterations.
The property's planning history.
Conservation Area and other designation status.
Any Article 4 Direction affecting the property.
The permitted development allowances that remain.
The design you actually want to achieve.
Building Regulations and other relevant requirements.
From there, we can help you understand your options. Sometimes the answer is a straightforward permitted development scheme. Sometimes a Lawful Development Certificate is appropriate, and sometimes the best solution is to pursue planning permission for a more ambitious design.
There isn't a one-size-fits-all answer — and that's exactly why getting the right advice early can save time, money and disappointment later.
Thinking about extending your home?
At SE Addition, we specialise in extensions, conversions and additions to homes across Norfolk, Cambridgeshire and Lincolnshire.
Whether you're thinking about a kitchen extension, loft conversion, garden room, garage conversion or a larger addition, we can help you understand what's possible and turn that into a thoughtful architectural design.
We are part of the wider BE Collective, bringing together complementary specialists across architecture, engineering, surveying, energy and cost management. The aim is simple: make the process of improving your home clearer, more joined-up and easier to navigate.
The rules surrounding Permitted Development Rights are detailed and can change, so project-specific advice should always be based on the current legislation and the individual property.
This article provides general information for homeowners in England and is not a substitute for project-specific planning advice. Permitted Development Rights depend on the individual property, its planning history, location and the details of the proposed work.
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