Edward Thompson
Hi Pamela a pitched roof is far more desirable than a flat roof and would help the extension to blend in better with the original house. Anything that improves the appearance will improve the value and take away the worries associated with having a flat roof for yourself and any future buyer. You wouldn't need a architect but you would need to inform building control at your local council and use a reputable tradesman to complete the work. You have two options with the roof structure- roof trusses or traditional cut roof and then use tiles or slates to match existing. Money well spent I would say! Ed.
