Integrity, Development, Construction, Massachusetts, General Contractor, Pioneer Valley, Renovation, New Homes, Addition, Design and Build, Construction Services, Amherst, Northampton, Hadley, South Hadley, Greenfield, Florence, Leverett, Shutesbury, Sunderland, Granby, Hatfield, Easthampton, Montague, Belchertown. Integrity Development and Construction Inc. is a design and build company located in Amherst Massachusetts. We build new homes and additions and renovate kitchens, bathrooms, basements and attics. We do both residential and commercial projects.