How long can extensions be

How Long Can Extensions Be On Your House?

Many households in the UK are in need of more space, that’s why so many people choose to have extensions added to their properties in order to create more light, space, and connection to outdoor areas.

Planning an extension should be exciting, allowing you to dream about all the extra space you will have for your home.

Problems often get in the way, though, Planning permission is usually a big one.

We’ve put together everything you need to consider when planning an extension for your home.

What’s The Largest Size For Extensions Without Gaining Planning Permission?

The first point on our list is the focus of this guide, what size can extensions be without having planning permission?

It’s a big question on many people’s minds.

In general, a single-story extension can’t extend further than the back wall of what’s called the ‘original house’ by any more than four metres to a house that is detached.

Or if it is more than three metres for all other houses.

The phrase ‘original house’ means its original design e.g. when the house was built.

It can also mean as it appeared on July 1st 1948.

Is It Possible To Extend A House By Six Metres?

Luckily, the strictness of planning permission in England was relaxed in 2019, meaning that extensions for single storeys that are not on designated land or sites of specific interest will not need the planning permission.

You just need to make sure that glazed building extensions for houses that are attached do not exceed six metres, or eight metres for houses that are detached.

Do You Need To Consult Your Neighbours For The Planning Permission?

The short answer is yes.

The Neighbour Consultation Scheme (sometimes called prior notification) means that you have to provide your immediate neighbours with 21 days to decide whether they want to make an objection to your extension project or not.

However, they have to give valid reasoning for their opposition.

So don’t think it’s just your neighbours disliking you.

If your neighbours do give you permission, the local authorities also have 21 days after that to confirm the project.

Are There Regulations With A Single-Story Extension?

The slight differences between building and planning regulations are sometimes hard to understand if you’re not familiar with these processes.

The point of planning regulations is because we need to make sure that our cities, countryside, and towns develop in a way that lessens the impact on the natural and metropolitan environment.

On the other hand, building regulations are all about setting standards in regard to the construction and design of extensions,.

This ensures that they are safe and secure.

Building regulations could be needed if a glazed extension does not have a translucent roof of 70%.

The other features that may mean building regulations are required include:

  • 50% glass coverage on walls that are newly constructed, if the area of the internal floor exceeds 30 square metres
  • if the extension isn’t sited to ground level
  • If it has no barrier (doors) that is between the primary building or house.

Is Planning Permission Needed To Extend Upwards?

There is more and more demand for housing in the UK.

That’s why the government granted new powers in 2020 to allow English homeowners to extend upwards without needing planning permission in full.

These new powers allow up to two additional storeys.

  • With the exception of houses that were built between 2nd July 1948 and 29th October 2018
  • Houses that are detached with two storeys or more
  • Terraced or semi-detached houses, for which you can build three and a half metres higher than the houses that are attached

You must think about the impact on your neighbours and the overall appearance of your new extension.

It’s also required to give prior notification, and tradespeople will also need to follow regulations for the required building.