As you are doubtless aware all building work is controlled by legislation. The Department of Environment grants all properties (with the exception of those within a conservation area) an allowance of Permitted Development. As of 1st October 2008, detached and semi-detached properties are generally allowed 50 cubic metres which may be extended out of the original roof pitch but not extending beyond the plane of any existing roof slopes which form the principal elevation of the dwelling house and fronts a highway. For terraced and end of terrace buildings this allowance is reduced to 40 cubic metres which may be extended out of the original roof pitch but not extending beyond the plane of any existing roof slopes which form the principal elevation of the dwelling house and fronts a highway.

Should the desired roof extension exceed the cubic metreage above then the construction
WILL REQUIRE Town & Country Planning permission which, regrettably, does tend to be restrictive at most Local Authorities. Therefore, homeowners who enjoy full Permitted Development entitlement will generally benefit from the widest range of design options.

In the event that Town & Country Planning permission is refused, you have a right of appeal to the Department of Environment. Such appeals can be both costly and time-consuming. However, in the event that a client wishes to make an appeal, we have a specialist appeals Architect who will carry out all the necessary preparation and applications together with arguments of local precedence, to lodge such an appeal.


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