If you want to be certain that the existing use of a building is lawful for planning purposes, or that your proposal does not require planning permission, you should apply for a 'Lawful Development Certificate' (LDC). A planning application can be submitted as a Permitted Development application to obtain this certificate. This can be very important when selling the house as it provides evidence on your house extension being legal. By proving all the construction work is lawful, this certificate can also allow a more easier handling of complaints made by neighbours.

Listed below are some of the Permitted Development rules, presented briefly. Please contact us for specific advice:

FRONT EXTENSION
Front house extensions are not permitted development unless:

• A porch not exceeding 3m in height
• A porch not exceeding floor area of 3 sqm
• A porch not within 2m of a boundary fronting a highway.

 
SINGLE STOREY EXTENSIONS​ (SIDE)
Side house extensions are considered permitted development providing they conform to the following:

• House extensions must not exceed 50% of the total area of land around the originally built house
• Have a height not exceeding 4m
• Width of side house extensions must not exceed half the width of the original house
• When within 2m of the boundary the eaves should not exceed 3m.

 
SINGLE STOREY EXTENSIONS​ (REAR)
Rear house extensions are considered permitted development providing they conform to the following:

• House extensions must not exceed 50% of the total area of land around the originally built house
• Have a height not exceeding 4m
• House extensions must not extend beyond the rear of the original house by 3m for attached, or by 4m for detached
• When within 2m of the boundary the eaves should not exceed 3m.

DOUBLE STOREY EXTENSIONS​ (REAR)
Rear house extensions are considered permitted development providing they conform to the following:

• Have a height not exceeding the height of the original house
• House extensions must not exceed 50% of the total area of land around the originally built house
• House extensions must not extend beyond the rear of the original house by 3m for both the storeys; and not be within 7m from the rear boundary
• When within 2m of the boundary the "whole eaves" should not exceed 3m
• Any window on the side elevation must not be opening below 1.7m from the finished floor level and must be obscured-glazed.

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On designated land, some of the Permitted Development rules do not apply.
This rights are only for houses; not flats, maisonettes or other buildings.
You should check with your Local Planning Authority whether your house has permitted development rights.
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​​​THIS LIST IS NOT EXHAUSTIVE AND YOU SHOULD ALWAYS SEEK ADVICE BEFORE THE START OF ANY WORK.

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