Designing a second extension beside an existing extension can be interesting. In this south Dublin project I wanted to modify the earlier extension but any such modification has to be under clause 4.1.h. of the 2000 Planning Act which defines a certain type of exemption: "development consisting of the carrying out of works for the maintenance, improvement or other alteration of any structure, being works which affect only the interior of the structure or which do not materially affect the external appearance of the structure so as to render the appearance inconsistent with the character of the structure or of neighbouring structures". This means that if the house had a pitched roof then the extension should too. The second extension on the left, which is exempt under the 2001 Planning Regulations, total extended area being under 40 sq.m., took its lead off the first but both were provided with gable walls and the opportunity for high level windows to allow good sun penetration. Each pitch roof also was given a ridge roof light which could be opened to allow...guess what...cooling! . Are we talking about Ireland?