Metal Building Specialists Fax: 508•799•6977 Cell: 508•509•9083 SBA Certified Read more about it here. HOME • ABOUT • TESTIMONIALS • METAL BUILDINGS • RETROFITS • CONTACT Midmass Construction Group, Inc. is the pre-engineered metal building specialist in Central Massachusetts serving Boston, Springfield, Worcester, Massachusetts, Connecticut, Rhode Island, New Hampshire and Maine. We are experienced and reliable in all phases of recreational, industrial, manufacturing, office, retail, warehouses, schools, churches, mini storage, distribution centers, garages, auto dealerships and many other types of metal - steel building fabrication. Wether it is new construction, retrofits or repairs... Midmass is the company to contact first!