Permitted Development Rights: What You Can Build Without Planning Permission?

What Are Permitted Development Rights?

Permitted development rights are national planning rules that apply across England. These permitted development rights UK homeowners rely on can allow certain types of work to proceed without planning permission.

They cover many common home improvements, including extensions, loft conversions, garden buildings, porches, roof alterations, and driveways.

However, permitted development rights do not apply in every situation. The rules vary depending on the property and its location. For example, different restrictions can apply to listed buildings, flats, and properties where permitted development rights have been removed.

In this guide, planning and design expert James Clague explains how permitted development rights work, what they allow you to build, and when you may need additional permissions.

Do You Need Planning Permission If You Have Permitted Development Rights?

Not always. If your project meets all the relevant permitted development rules, you can usually carry out the work without planning permission.

However, you can only rely on permitted development rights if your project meets the relevant rules. If it does not, you will need planning permission.

Even if planning permission is not required, you may still need other approvals, such as building regulations approval or listed building consent.

If you are unsure whether your project qualifies as permitted development, it is worth seeking professional advice before starting work.

What Can You Build Under Permitted Development Rights?

Exactly what you can build depends on your property and where it is located, but common examples include:

House Extensions

In many cases, you can build a single-storey or double-storey rear or side extension without planning permission if it meets the permitted development rules.

Loft Conversions

You can often convert your loft without planning permission, including adding rooflights or dormer windows.

Outbuildings And Garden Rooms

Permitted development rights may allow you to build a garden office, gym, studio, shed, garage, or other outbuilding without planning permission if it supports day-to-day life at home.

Porches

You can often add a small porch without planning permission if it meets the size limits.

Roof Alterations

You can make some roof changes, such as adding rooflights, without planning permission.  

Driveways

In some cases, you can create a new driveway or replace an existing one without planning permission if it has proper drainage.

Additional Storeys

Some houses can be extended upwards under permitted development rights by adding one or more additional storeys. However, these projects are subject to specific restrictions.

The rules are not the same for every property, so it is always worth checking what applies to your home before starting work. 

In some cases, you may also need prior approval from the local authority before work can begin.

What Are The Main Permitted Development Rules?

Permitted development rules set limits on what you can build without planning permission.

For example:

• A single-storey rear extension can usually extend up to 4 metres beyond the rear wall of a detached house and 3 metres beyond a semi-detached or terraced house. In some circumstances, larger extensions may also be possible
• A two-storey rear extension can usually extend up to 3 metres beyond the rear wall of the house, subject to additional restrictions relating to its height, position, and distance from neighbouring boundaries.
• Most loft conversions can add up to 40 cubic metres of roof space on a terraced house and 50 cubic metres on a detached or semi-detached house
• Outbuildings and garden rooms cannot cover more than 50% of the land around the original house
• A porch must generally not exceed 3 square metres in floor area or 3 metres in height
• Outbuildings are usually limited to a maximum height of 2.5 metres if they are within 2 metres of a boundary.

These are only some of the main restrictions. The rules vary depending on the type of project and the location of your property, so it is important to check the relevant requirements before starting work.

Previous Extensions Can Affect What You Can Build

Many permitted development rules are based on the size and appearance of the original house, rather than the property as it exists today. 

In planning terms, the original house is the property as it was when it was first built. For older properties, it is usually the house as it stood on 1 July 1948.

This means previous extensions, loft conversions, and other alterations may affect what you can build under permitted development rights, as the limits are usually calculated from the original house rather than the current one.

When Do Permitted Development Rights Not Apply?

Permitted development rights do not apply to every property. In some cases, they are restricted or removed altogether, meaning you will need planning permission before carrying out work.

Below are some of the most common situations where permitted development rights may not apply.

Listed Buildings

If your property is listed, you will usually need listed building consent (LBC) before making changes that affect its character or historic features. Read our guide on listed building consent to learn when permission is required.

Conservation Areas

Living in a conservation area does not automatically remove your permitted development rights. However, the rules are often stricter. Our guide to permitted development rights in conservation areas explains the restrictions that may apply.

National Landscapes

If your property is in a National Landscape, National Park, or another protected area, you may face additional restrictions on what you can build without planning permission.

Article 4 Directions

Your local council can remove certain permitted development rights through an Article 4 Direction. If this applies to your property, you may need planning permission for work that would otherwise be allowed.

Flats And Maisonettes

Unlike houses, flats and maisonettes have limited permitted development rights. Many external alterations, extensions, and roof changes will require planning permission.

Properties With Removed Permitted Development Rights

Some properties have planning conditions that remove permitted development rights altogether. This is common on newer housing developments and in environmentally sensitive locations.

How Can You Check Whether Permitted Development Rights Apply To Your Property?

The easiest way to check is to speak to a planning consultant or architect before you start designing your project. At James Clague Architects, we can quickly assess whether permitted development rights are likely to apply and advise on the best route forward.

You can also contact your local planning authority (LPA) to discuss your proposal.

Should You Apply For A Lawful Development Certificate?

A Lawful Development Certificate is not a legal requirement, but applying for one is often a good idea.

The certificate provides formal confirmation from your local council that your project falls within permitted development rights and does not require planning permission.

Many homeowners choose to apply for a Lawful Development Certificate because it gives them peace of mind before work starts and can help avoid questions or disputes in the future. It can also make it easier to sell your property, as it proves the work you carried out was lawful.

What Is Prior Approval?

Prior approval is a type of permission you may need before starting certain permitted development projects.

Not all permitted development projects require prior approval. However, some types of development, such as larger home extensions and certain changes of use, may need approval for specific issues such as design, transport, flooding, noise, or the impact on neighbouring properties.

In some cases, the prior approval process may include notifying neighbouring properties and allowing them to comment on the proposal before a decision is made.

If prior approval is required, you must apply to your local council and wait for a decision before starting work.

An architect or planning consultant can advise whether your project requires prior approval and help prepare the application if needed.

Need Advice On Permitted Development Rights?

Permitted development rights can be a useful way to extend or improve your home without applying for planning permission. However, the rules are not always straightforward, and they vary depending on the property and its location.

At James Clague Architects, we regularly advise homeowners on permitted development rights, planning permission, and Lawful Development Certificates. We can help you understand what is possible and whether your project is likely to require further approvals.

If you are planning an extension, loft conversion, garden room, or other home improvement project, get in touch to discuss your options.