Bought the main shed a few years ago from Homebase. It was badly damaged, so I got it for peanuts,the floor was missing so I added a tiled floor and have just added the bike shed extension,most of it was built from an old fence that was blown down.I doubt if the lot has cost £100.00 as I salvage material from everywhere.
I have built the shed on a concrete base,and double skinned the inside, just in the process of making a couple of storage units and worktop. have strung blue solar powered led lights round the apex of shed I called the shed Spiderland to keep my wife and daughter out