How big can an extension be without planning permission (including conservation areas)? (2024)

Can I build an extension without planning permission?

The answer is yes, subject to a few terms and conditions…

The addition of a new building on your land may seem like a good idea initially but when you delve deeper into the regulations, the red tape surrounding planning permissions can become rather complex. However, since permitted development rights were extended in 2013 under the Larger Home Extension Scheme, it’s hardly surprising that architects, builders and double-glazing companies across England have experienced a considerable boost in demand for single-storey extensions and conservatories in conservation areas. This is why we thought it the perfect time to explain exactly how big a building can be without the need for planning permission, including conservation areas.

Our Extensions

What size extension can I build without planning permission?

So, how big can I extend my home without planning permission? Well, single-storey extensions, e.g. conservatories and orangeries, are covered by permitted development rights as long as:

Attached property extensions do not extend beyond the rear wall of the original home by more than 3 metres.
Detached propertyextensions do not extend beyond the rear wall of the original home by more than 4m.
The extensions roof & ridges must not exceed the height of the original house and the eaves must not exceed 2m in height of the boundary of 3m.
Single-storey extensions must not exceed 4m in height.
Single storey extension width must not exceed half of the original size of the house.
Extensions on the side or front of a house must be closer to the property than a public highway.

This legislation covers houses across England that are not restricted by Article 4 directions.

What is the maximum extension without planning permission on homes in conservation areas?

Depending on the outcome of the Neighbour Consultation Scheme, single-storey extension builds in conservation areas are covered by permitted development rights as long as:

Planning permission legislation update June 2019

As of1st June 2019, relaxed planning permissions have been made permanent inEngland only. This means that single-storey extensions situated outside ofdesignated landandSites of Specific Interestwon’t need planning permission, as long as glazed extensions on attached houses don’t exceed 6m or 8m for detached houses.*Subject toThe Neighbour Consultation Scheme

So, there’s never been a better time to invest in an extension for your home!

How big can a building be without planning permission?

The recent relaxation of permitted developments means that homeowners are now able to add extensions without needing planning permissions. You can add a home extension or conservatory up to six metres, or eight metres if your home is detached, without needing to apply for planning permission. There’s very little standing in the way between you and your dream home!

What are the benefits of a glazed extension or conservatory?

So now you know about the planning permission guidelines, but why extend your home? Here are 5 great reasons to carry on with new conservatory and extension plans this year.

Glazed extensions = more space, more enjoyment

When you desperately need extra space, an extension is an economical solution that takes no time at all to install. From refreshing contemporary kitchen extensions to impressive home offices, right through to made-to-measure glazed extensions. With a style to suit all properties, lean-to conservatories make the ideal accompaniment for homes with limited space, whereas P-Shaped conservatories are perfect for larger homes.

Glazed extensions add privacy

If you’re looking for a way to update an existing glazed extension space, a solid roofing system will blend seamlessly with the existing aesthetics whilst offering more privacy inside. This is an ideal option for homes overlooked by neighbouring properties.

Ask us a Question

Cheaper than moving to a new house

When you consider the current state of the housing market, it’s hardly surprising that more and more homeowners are choosing to improve rather than move. Ideal for those struggling for space or unable to find a suitable property, once the market recovers, you should experience notable property value increases too.

Glazed extensions light up your life

Imagine relaxing in your new conservatory, orangery or extension space throughout the seasons. Watching the world go by, your worries just melt away in a glorious glazed extension space.

Bathing in warming natural light has many health benefits, including increased production of Vitamin D, which is essential for healthy bones and lowering blood pressure. If your budget permits, a grand gable conservatory will expertly maximise the light entering your home.

For more ideas on how to increase the amount of sunlight in your home, read our top blog about how to cleverly maximise light!!

Make the most of your garden & enjoy nature all year round

If you have a garden or enclosed outdoor area, staying home doesn’t have to mean staying inside. A glazed extension allows you to merge indoor and outdoor areas together, especially if you add sophisticated French doors, streamlined bi-fold doors or maximising sliding patio doors into the mix. Providing the perfect setting to appreciate nature all year round, a glazed extension from SEHBAC is a must for keen bird watchers and stargazers too.

And so long as you follow the guidelines listed above, all this can be yours without the hassle of applying for planning permission!

Quality home extensions in South East England

Get a price

If you require extra living space as your family grows, our range of bespoke extensions will provide the ideal finishing touch to any South East home. The right levels of experience and quality can truly make or break the quality of your renovation. So, be sure to employ the very best installers around. Get in touch with the award-winning SEH BAC team today for all your home improvement needs.

Conservatory Planning Permission
Do I need planning permission for a conservatory?
What is the maximum you can extend your house?

How big can an extension be without planning permission (including conservation areas)? (2024)

FAQs

What is the maximum size of an extension without planning permission? ›

Detached property extensions do not extend beyond the rear wall of the original home by more than 4m. The extensions roof & ridges must not exceed the height of the original house and the eaves must not exceed 2m in height of the boundary of 3m. Single-storey extensions must not exceed 4m in height.

Discover More Details ›

Can I build an extension in a conservation area? ›

To extend your house in a Conservation Area you will likely need to apply for planning permission. This can be hard to obtain and why you should be guided by experts throughout your project.

See Details ›

What is the maximum size of a conservatory without planning permission? ›

To build a conservatory without planning permission it must cover less than 50% of the area your home covers. It must also be lower than four metres high at the back of side of your home. If you build it at the side, it must also be narrower than the width of your home.

Show Me More ›

Do I need planning permission for a side extension? ›

Single storey side extensions, like a lot of extensions, can fall under permitted development. This means you won't need to apply for a full planning application, if you meet the stipulated criteria.

Learn More Now ›

How much of an extension can I build without planning permission? ›

The most common reasons for needing planning permission are when you want to: Build an extension which is more than 40 square metres (this includes new and any existing extensions)

Get More Info Here ›

Can I build an extension without drawings? ›

One of those vital steps is the drawing and design stage. Getting your house extension plans right is an absolute necessity for your dream extension to become a reality. To achieve this you'll need the proper architectural drawings and knowledge and the right guidance from skilled professionals.

Get More Info ›

What is the highest you can build without planning permission? ›

Maximum eaves height should be no higher than the eaves of the existing house. The highest part of an outbuilding (including cresting and finials) should be no higher than the roof ridge line of the existing house.

Do you need planning permission for a sun room? ›

Do you need planning permission for a sunroom? Before the installation can begin, you might be wondering if you need to get planning permission for your sunroom. As a general rule, you won't need planning for a sunroom as long as it meets specific criteria, such as not being taller than the existing property.

Learn More Now ›

Do I need planning permission for a porch? ›

Typically, you do not need planning permission for a porch, provided it complies with specific requirements. Porches are regarded as permitted developments if they adhere to certain limits and conditions. This would enable you to complete the installation without obtaining planning permission approval.

Discover More Details ›

Can I build my own extension? ›

Yes, You Can Build Your Own Extension

But before you rush out and start, what follows is a comprehensive guide so that you can build your own extension confidently and competently. To do the manual work all you need to be able to do is measure and cut things with a fair degree of accuracy.

Learn More ›

Can my Neighbour stop my extension? ›

If your extension plans encroach in certain ways on the properties that border yours, it's possible your neighbour or neighbours could convince the council to stop you. The best way to avoid conflict is always to try and talk it out — but what if the differences can't be reconciled?

Explore More ›

Do I need an architect for a side extension? ›

This is a very common dilemma for homeowners, particularly those doing modest kitchen extensions or interior alteration work on a budget. The short answer is no, not necessarily. HOWEVER, I definitely wouldn't recommend skipping the design/drawing phase of the project completely.