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HELP NEED SHED EXTENDED.

I am just looking for a quote and more than likely the work done. I have a standard garden shed at the back of my family home and want it extended big enough so it can be made into a bedroom. I want it insulated and a Little window put on the back wall also a proper door with a lock that can be locked from the inside and outside for when I'm out etc. I don't want anything to big.