Building a garden shed. when considering a new shed, summer house, or greenhouse etc, there are a number of things you should consider before hiring someone to erect the building for you. the information below, kindly supplied by leisurebuildings, (a uk based garden building company) discusses the important issues of new garden buildings.. An updated tour of our shed to house conversion. we bought this 16x52 premier portable buildings about one year ago and have been finishing it out since. we chose to increase the standard height. Any shed must be built at least 2.5m away from the main house. it’s advisable to be able to walk round all four sides, or however many you choose. this gives you access for decorating and repair. butting your shed right against a garden fence doesn’t allow the shed room to ‘breathe’ and is an invitation for damp to set in..