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Do you need planning permission?

This article is about the Planning Permission required or not? for the Loft Conversions.

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Also you may reed more in the Hammersmith and Fulham Council

Planning permission is not normally required. However, permission is required where you extend or alter the roof space and it exceeds specified limits and conditions.

These are specific to "the enlargement of a dwellinghouse consisting of an addition or alteration to its roof" as detailed in Schedule 2, Part 1, Class B of the The Town and Country Planning (General Permitted Development) (England) Order 2015.

A loft conversion for your house is considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions:

  • A volume allowance of 40 cubic metres additional roof space for terraced houses

  • A volume allowance of 50 cubic metres additional roof space for detached and semi-detached houses

  • No extension beyond the plane of the existing roof slope of the principal elevation that fronts the highway

  • No extension to be higher than the highest part of the roof

  • Materials to be similar in appearance to the existing house

  • No verandas, balconies or raised platforms

  • Side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor

  • Roof extensions not to be permitted development in designated areas

  • Roof extensions, apart from hip to gable ones, to be set back, as far as practicable, at least 20cm from the original eaves

  • The roof enlargement cannot overhang the outer face of the wall of the original house.

The permitted development allowances described here apply to houses and not to:

  • Flats and maisonettes (view our guidance on flats and maisonettes)

  • Converted houses or houses created through the permitted development rights to change use (as detailed in our change of use section)

  • Other buildings

  • Areas where there may be a planning condition, Article 4 Direction or other restriction that limits permitted development rights.

To find our more our Senior Surveyor will be able to meet you and discuss more about your project.

Book the senior Surveyor

More information you can find on our website:

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