About Us

One Autumn Street Portsmouth, NH 03801

Jdscn0538SN Associates, LLC

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.


Contact Information

Phone: 603-433-8639

1 Autumn Street
Portsmouth, NH 03801

Get In Touch.

If you are interested in working with JSN, send us an inquiry and we will get back to you as soon as we can!