About UsOne Autumn Street Portsmouth, NH 03801
1 Autumn Street, Portsmouth , NH 03801
JSN was established in 1987 to provide engineering and design services to the construction industry throughout New England. Currently operating with a staff of ten to twelve, JSN completes hundreds of projects each year. We have over 500 clients including architects and designers, contractors, owners, developers, and municipalities. We are a hardworking and creative firm that places our client’s needs first.