COPING WITH COMMERCIAL CODES The complex maze of regulations and regulators can set you back if you're not prepared by John Ed Ryan In most states, the plans for singlefamily dwellings may be obtained offthe- shelf or you may draw your own. Building officials even see the occasional single-line drawing on the back of a grocery bag. Regulations for construction of dwellings are relatively simple. You buy a lot, check the zoning setback and area restrictions, dig a hole or trench and go to work. Commercial and industrial buildings are different. The codes are more complicated. There are also more agencies and applicable statutes and ordinances such as those governing land use, environmental concerns, soil erosion, offstreet parking, handicapped access, and fire