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Permitted Development Extensions

Updated: May 16

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Permitted Development Extensions: What you need to know

Building an extension under permitted development can be a great way to add space and value to your home. However, it can also be a complex and costly process that involves obtaining planning permission from your local authority. Fortunately, there is a solution that allows you to build an extension without planning permission, known as permitted development.

Permitted development is a set of rules that allow homeowners to make certain changes to their properties without needing planning permission. This can include building extensions, loft conversions, and even outdoor structures such as garden sheds. In this blog post, we'll be focusing on permitted development extensions and what you need to know if you're considering building one.

What is a permitted development extension?

A permitted development extension is an extension to a property that is allowed without the need for planning permission. Permitted development rules set out certain conditions that extensions must meet in order to be considered permitted development. These conditions vary depending on the location of the property and its classification under planning law. In England, for example, a single-story rear extension of up to six meters for terraced or semi-detached houses, or up to eight meters for detached houses, can be considered permitted development, subject to certain conditions such as prior approval. In Scotland, permitted development rules are slightly different, with extensions being allowed up to four meters for detached and semi-detached properties, and up to three meters for terraced properties.

It's important to note that even if an extension falls under permitted development, it still requires building regulations approval. Building regulations are a set of standards that must be met for all building work, and they cover areas such as structural stability, fire safety, and energy efficiency. It's always advisable to check with your local planning authority or a qualified professional before proceeding with any building work.

What are the benefits of a permitted development extension?

There are several benefits to building a permitted development extension, including:

1. No need for planning permission: The most obvious benefit of a permitted development extension is that it doesn't require planning permission, which can save time and money.

2. Faster construction: Since you don't need to go through the planning permission process, you can start building your extension sooner, which means you can enjoy the extra space sooner too.

3. Increased property value: Adding an extension to your home can increase its value, which can be especially beneficial if you're planning on selling your property in the future.

4. More living space: Whether you're looking to add an extra bedroom, a larger kitchen, or a home office, a permitted development extension can provide you with the extra living space you need without having to move house.

What are the limitations of a permitted development extension?

While permitted development extensions offer many benefits, there are also some limitations to consider. These include:

1. Size restrictions: Permitted development extensions are subject to size restrictions, which can vary depending on the location of the property and its classification under planning law. If you want to build a larger extension, you may need to apply for planning permission.

2. Height restrictions: Permitted development extensions are also subject to height restrictions, which can vary depending on the location of the property and its classification under planning law.

3. Design restrictions: Permitted development extensions must comply with certain design restrictions, including the materials used and the design of the extension itself.

4. Building regulations: Even if your extension falls under permitted development, it still needs to comply with building regulations. This can add additional costs and complexity to the building process.


Permitted development extensions can be a great way to add space and value to your home without needing planning permission. However, it's important to understand the limitations and requirements of permitted development rules before starting any building work.

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