Building in Hawley can be complicated process subject to town, county, and state regulations. Hiring a professional to walk you through the processes of permitting and building can be a big help. A number of groups have purview over construction issues, including the Conservation Commission, the Planning Board, the Fire Department, and the Zoning Board of Appeals.
A good place to start is the Franklin County Cooperative Inspector Program, in which Hawley participates. The program provides permits and inspection for building, electrical, and plumbing/gas projects. All construction in Hawley should follow town bylaws.
If you’re not sure whether you need a building permit, consult this handy guide.