Ask a Tradesman
Seems only the Germans and Aussies do them! Anyone know where I can get a prefabricated extension from which will be factory built and then simply craned onto site? Can they sit onto a steel base (commonly used for conservatories?)
The answer is yes yes and yes,
Tap in to the search bar and all will be revield,then pick one in your area or get them to cost against each other.
Answered 8th Nov 2012