Do I need planning permission for my extension?

Getting planning permission for any building work can be a nightmare. The building regulations are tricky to read and full of loopholes, and if you don’t get planning permission when needed, you could end up having to tear your extension down again.

To help you find out if you need planning permission for your extension, we’ve developed this easy planning permission calculator. Just answer the questions and we’ll tell you whether you need to make a planning application.

If you’ve chosen to get a bespoke glass extension from Apropos, you don’t need to worry, as we’ll take care of the planning process for you as part of our world class service.

1

Will more than half of the land around the original house be covered by extensions or additional buildings once the new extension is built?

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To work this out, you will need to know the area of the land, as well as the area of the original house, not including any extensions. Take the area of the house away from the area of the land to get the area of the land surrounding the original house.

Then add together the area of any existing extensions, plus the area of the new extension you are considering. If this number is more than half the size of the area of land around the original house, you will need planning permission. If it is smaller than half, you may not need planning permission.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

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2

Will the extension extend more than 3 metres beyond the rear wall of the original house, or more than 4 metres beyond if your house is detached?

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The ‘original house’ is the house as is was first built, not the house as you purchased it. You must not take into account any subsequent extensions when calculating the distance from the rear wall.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

3

Do you live on Article 1(5) designated land or a site of special scientific interest?

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Article 1(5) designated land refers to any land within a National Park, an Area of Outstanding Natural Beauty, a World Heritage Site or any land that has been otherwise designated as protected land by the council. An Area of Special Scientific Interest (ASSI) is an area that is protected for conservation purposes. Houses on these types of land can be extended up to 6 metres from the rear wall of the original house if it’s attached, or up to 8 metres if detached, without requiring planning permission. These limits are only temporary however, all extensions must be completed before 30th May 2019.

If your planned extension is larger than this, you will need planning permission.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

4

Will the extension be higher than the highest part of the roof?

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

5

Is the house a listed property?

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If you don’t know whether or not your house is a listed building, you can find out from the appropriate Heritage organisation. To find listed homes in England, check the National Heritage list for England on the Historic England website. For listed houses in Wales, search on the Historic Wales Portal. For listed houses in Scotland, search on the Historic Environment Scotland portal.

As a guide, all houses built before 1700 that are still close to their original condition will be listed. Houses built between 1700 and 1840 are also likely to be listed. Houses built after 1945 are unlikely to be listed and usually a building must be at least 30 years older to be considered for a listing.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

6

Will the extension be forward of the principal or side elevation fronting a highway?

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If you are planning an extension on the front or side of your house, facing a public road, you’ll need planning permission if it the extension will be closer to the highway than the original house. If the extension is on the rear of the building, but there is a public highway at the back of your house, you may still require planning permission.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

7

If the extension is more than one storey, will it be within seven metres of any boundary opposite the rear wall of the house?

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If you’re planning a multi-storey extension to the rear of your house, there needs to be at least seven metres between the end of the extension and the boundaries of your land in order to qualify as a permitted development.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

8

If the extension is one storey, will it be greater than four metres in height?

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

9

If the extension is within two metres of the boundary, will the eaves be greater than three metres in height?

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The eaves are the part of the roof that overhang or meet the edge of the building. If you’re planning to have an extension with a pitched roof, you should consider the height of the eaves, not the height of the highest point of the roof for the purposes of answering this question.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

10

If the extension is more than one storey, will the roof pitch match the existing house?

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For this question, consider both the height and the slope of the roof.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

11

Will the extension include any verandas, balconies or raised platforms?

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure continue quiz

12

Will the eaves or ridge height of the extension be higher than the existing house?

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For this question, you need to consider whether the total height of the extension is higher than the total height of the house.

You may need planning permission

Your answers indicate that you will likely need planning permission for your extension. Navigating the regulations and handling a planning application can be a complicated and stressful process. If you’ve chosen a bespoke Apropos extension then you don’t need to worry - we’ll take care of the whole process for you, leaving you paperwork free. If not, then why not download a copy of our brochure?

Download a brochure

You may not need planning permission

Your answers indicate that your extension might be a permitted development, so you may not need planning permission. This tool isn’t definitive, so we would recommend you contact your local planning authority with your plans to get confirmation. Alternatively, if you’ve chosen Apropos to design and build your new extension then we’ll take care of the planning process for you, saving you the hassle. Not got your plans together yet? Download our free buying guide to get started.

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