1 Planning permission-You usually only need to apply for planning permission to convert a garage when you intend to extend the actual size of the garage. 2  However, check with your local authority as the precise rules do differ. Double garage-You may either convert the whole area, or just the nearest side to your house. 2  If you convert it all, you can expect to add around 300 square feet of floor space to your home. 3  Tandem garage-As before, converting only the back will leave you with the best of both worlds.
Below is an outline of the main components of a shed or garage and what you can expect to pay: Sheds and Garages Kit Cost $3,500 â $28,000. These range from a single car garage to a large fully lock-up workshop. Sheds and Garages Permit Cost Approximately $900. Plus warranty insurance of $750 if the job is worth over $12,000. (Central Steel Build is a registered builder). Sheds and Garages Footing Costs $400 â $1900.
1 Also according to ThisOldHouse.com, the easiest and most expensive method is to hire a local contractor to build a custom shed, costing at least $2,000-$3,000 or more for an extremely simple 10x10 foot structure. 2  Major pre-cut wooden kit manufacturers include Better Barns, Sheds.com and HandyHome.com. Home Depot sells prefab metal sheds starting at $560 for 8x6 feet and up to $1,250 for 10x17 feet. . 2  Arrow is one of the major metal shed manufacturers.