A1 Masonry contractors are licensed and insured paving contractors based in Washington DC. Construction and masonry have been in the family for 4 generations and there’s nothing we don’t know about the list of services we provide with high-end results, Our service area covers the entire Tri-State area. If you live outside these areas and would like to avail of our services, please call to discuss it. At Stone and Concrete, we’re proud to provide our clients with a more professional approach. Our business was built on our commitment to quality service.