The traditional size of a custom or prefabricated storage shed tends to be 10'x12' or 120 square feet. for the purpose of this discussion we will look at the costs associated with the construction of a modest, and yet extremely durable storage shed of this size.. Average cost per square foot: $12-$17. those of us that are old enough probably remember the craze of little metal sheds sold at sears! well, you can still buy them from many suppliers including sears, walmart, and many others online. but the most well-known manufacturer is arrow. arrow sheds come in kits that contain sheets of tin and packs of. A 10x20 storage shed will have 200 square feet of available space, approximately. remember to figure for space to bring any lawn equipment in and out. a 10x20 portable shed is also large enough to serve as a single car garage ..
Walls and roofing: pressure-treated lumber posts, beams, rafters and joists cost an average of $6.50 per square foot, while roofing averages $12 to $15 for a 2-foot by 16-foot length; siding: osb siding costs around $2 to $4 per square foot, while cedar plywood costs $2.75 to $6.50 per square foot; door: a simple door should cost around $140 on.
