the building it's self is only 3x4 meters so not a large shed but i would the area where i wish this shed to be place has a house bricks base and to cut down on costs could this base be inhanced with more house bricks to form the base. the shed I would like it to insolated so that I can use the shed all year round also I would like the roof to be built with a split roof lantern, small window near the door. the door is to be standard size but with a half size false door for easy of access. also I would like the shed to have power and light.
Specialist shed fitter. I do these for a few people and can advise on the best materials and heating etc. It sounds like you need a workspace for your job - potentially that could be a business cost if you are self employed and VAT back etc Let's have a chat and find out where the project is and what you want. Rich