Regs for a single storey rear extension – a guide

Regulations are always changing and it can be difficult to keep up to date with the rules you need to adhere to. At Eurocell, we’re here to help tradespeople, so we’ll be pulling together easy to follow guides informing you of the regs you need to follow for a range of projects. Sit down and get a brew because first up, we have single storey rear extensions!

First of all, an extension or addition to your house is considered to be permitted development and therefore doesn’t require an application for planning permission as long as you follow the below:

  • It’s important that no more than 50% of the land around the house would be covered by the extension. This might mean measuring the garden and sizing the extension accordingly

  • You cannot build an extension forward of the principal elevation or side elevation fronting a highway

  • The extension cannot be higher than the highest part of the roof and can be a maximum of four meters. For a single storey extension, this shouldn’t be a problem but is definitely worth highlighting!

  • If the single-storey rear extension is on a detached house, it cannot extend further than four meters. Attached houses cannot extend further than three meters

  • The maximum eaves and ridge height of extension can be no higher than the existing house

  • Side extensions can only be single storey with a maximum height of four metres and a width no more than half that of the original house

This guidance reflects temporary increases to the size limits for single-storey rear extensions that must be completed by 30 May 2019, and the associated neighbour consultation scheme.

We’ll make sure we update you with any changes to this in June 2019! How do you keep on top of your industry and regulation updates?

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