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Can I build an extension without planning permission?

Single-storey extensions fall under permitted development rights, which allow you to carry out standard home building projects without needing to apply for planning permission. However, you DO need planning permission for your extension if:

• The extension covers more than 50% of the land around the house
• The extension faces directly onto a road
• The highest point of the extension is higher than highest point of the home’s existing roof
• The eaves and ridge height are higher than the existing house

If you live in a listed building, even if you do not require planning permission, you may require Listed Building Consent. Similar restrictions may apply if you live in a conservation area.

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Planning permission for extensions and conservatories

The following regulations are all in place for detached and semi-detached properties in England. Extensions on the side of your house require planning permission if:

• They are over 4 metres in height, or are more than a single storey
• They are wider than half the width of the original house

Extensions on the rear of your house require planning permission if:

• They are over 4 metres in height, or are more than a single storey
• They extend beyond the rear of the original house by over 6 metres (for semi-detached properties) or 8 metres (for detached properties)

Conservatories come under the same rules as single-storey extensions, so the above is also the case for conservatories.

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Can I build an extension without building regulations?

Planning permission deals mainly with the appearance of a structure, and whether it’s in keeping with the atmosphere and aesthetic of the local environment. Building regulations, however, are concerned with whether an extension is structurally sound and safe to build. A majority of extensions will require approval under building regulations. This is to ensure that the extension does not do damage to you or someone else’s property. If an extension is built on top of a drain, or above dormant tree roots, for example, this can cause a serious problem. Conservatories, however, will not require building regulation approval if the remain at ground level (without foundations) and are less than 30 square metres in surface area.

These regulations are in place to protect you and the structural integrity of your property. As a family-run business, it matters to us that you feel safe in your home. Whatever regulations are required to get your extension up and running, we’re here to guide you through every step.

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