ask us a question on permitted development           Permitted Development England
How to build a home extension  without Planning Permission using your PD rights - Oct. 1st 2008



Home Page About Us FAQ Advertise on this site Disclaimer Privacy Contact Us Site Map

Appeal Decision 63 - Certificate of Lawful Development.

This appeal decision summary and assessment has been produced by Planning Jungle Limited.  For more information, please go to

December 2009 - Code a00063


Summary of Case (appeal allowed): 


The property is a two-storey semi-detached house, and the application included a proposed rear dormer. 


The key issue was whether the use of felt for the flat roof of the proposed rear dormer would be contrary to Class B, part B.2(a), which requires that “the materials used in any exterior work shall be of a similar appearance to those used in the construction of the exterior of the existing dwellinghouse”. 


The Inspector stated the following: 


“The condition requires that external materials used shall be of similar appearance to those of the exterior of the existing dwellinghouse. This does not require, therefore, that they have to be of the same type, or even that they match, rather it must mean that factors such as visibility and overall effect on the appearance of the house when the development has been undertaken are relevant”.  


"As for the felt roof, this would not be visible from any public viewpoint, and most probably in any private view, because of the height of the dormer, and its proximity to the ridge of the house. The use of felt, or any other material, on the flat roof would have no impact whatsoever on the appearance of the existing dwellinghouse, as it could not be seen. I therefore conclude that the materials that would be visible would be likely to be of a similar appearance to those used in the construction of the exterior of the existing dwelling and, to that extent, the condition in question is likely to be met.” 


Main Conclusions: 


·       The use of felt (or similar) for the flat roof of a dormer (assuming that the visibility of the roof would be limited) would not be contrary to Class B, part B.2(a). The Inspector indicates (or implies) that the felt would not need to have a similar colour to the materials on the existing house.
[Note: This would appear to contradict at least one other appeal decision – for further information see the entry in the “Reference Section” on “Materials”]
[Relevant to: “Materials”, A.3(a), B.2(a)].


Links to the “Appeal Decision Notice” and other associated documents (e.g. drawings, etc): 


·       Appeal Decision Notice: 






Download documents and diagrams of useful

Permitted Development information

permitted development documents download

 Appeal Decisions