Business Details
39 Years
experience
Your Trusted Engineering Partner in Portsmouth
Established in 1987, JSN has built a reputation as a trusted engineering and design firm serving the construction industry across New England. With a dedicated team of ten to twelve professionals, we complete hundreds of projects annually for a diverse clientele including architects, contractors, developers, and municipalities. Our approach prioritizes client needs through innovative solutions and technical expertise. Led by licensed professionals with decades of combined experience, our firm maintains a strong commitment to quality and collaboration. We specialize in structural engineering, design services, and project management tailored to complex commercial and mixed-use developments.Our work on landmark projects like the Brick Market redevelopment demonstrates our ability to balance modern design with historic preservation. By fostering long-term relationships with clients, we ensure every project aligns with both technical requirements and broader vision. Our team's extensive licensing across multiple states underscores our regional expertise and adaptability. Through continuous professional development and investment in cutting-edge technology, we maintain industry leadership while delivering personalized service. This combination of experience, technical proficiency, and client focus has sustained our growth and reputation over three decades in the field.
Services
Structural Engineering
Project Management
Design Services
Commercial Development
Historic Preservation
Details
- Year established: 1987
Highlights and features
- We have over 35 years of engineering experience in New England's construction industry
- Our team includes licensed professionals in six northeastern states
- We maintain long-term relationships with 500+ architecture and construction clients
- Specialized expertise in historic district developments and complex structural projects
- Proven track record completing hundreds of projects annually since 1987
Services
Structural Engineering
Our structural engineering services provide comprehensive solutions for commercial and residential buildings. We specialize in designing structural systems that meet modern safety standards while addressing unique site challenges. Our team delivers precise calculations and detailed documentation for new constructions and renovations.
Project Management
We offer full-cycle project management for complex construction developments. Our services include scheduling, budget oversight, and coordination between architects, contractors, and regulatory bodies. This ensures timely delivery while maintaining technical accuracy and compliance with local regulations.
Design Services
Our design team creates innovative solutions that balance functionality with aesthetic requirements. We work closely with clients to develop plans that optimize space usage while meeting structural integrity standards. Services include 3D modeling and detailed construction documentation for various building types.
Commercial Development
We support commercial development projects from concept to completion. Our expertise includes mixed-use buildings, office complexes, and retail spaces. We provide technical guidance for zoning compliance, structural systems, and integration with urban infrastructure in historic districts.
Historic Preservation
Our historic preservation services focus on maintaining architectural integrity during modernization projects. We specialize in techniques that protect historic structures while implementing contemporary engineering solutions. This includes foundation reinforcement and adaptive reuse strategies for older buildings.
People
Jeffrey S. Nawrocki
Chief Executive Officer
Jeffrey S. Nawrocki founded JSN in 1987 after five years in the precast industry. With a civil engineering degree from the University of NH and licenses in five states, he brings 40+ years of structural engineering experience to our projects.
Sarah E. Desiderio
President
Sarah Desiderio holds a master's degree in structural engineering from UMass Lowell. Licensed in six states, she has 20+ years of experience managing complex projects and returned to JSN leadership in 2018 after a successful industry career.
Matthew J. Allen
Vice President
Matthew Allen has served as JSN's Vice President since 2000. A University of NH graduate with licenses in NH and MA, he specializes in structural systems design and has managed hundreds of commercial projects over 25+ years.
Roger V. Brown
Project Designer
Roger Brown brings 30+ years of design expertise to JSN as our LEED-certified project designer. He has contributed to major developments across New England since joining the firm in 1990, specializing in sustainable design solutions.
Chuck Tinkham
Senior Structural Engineer
Chuck Tinkham joined JSN in 2012 with extensive experience in structural engineering. A licensed professional in NH and MA, he contributes technical expertise to complex projects requiring advanced structural solutions and code compliance.
Questions
What engineering services does JSN offer?
JSN provides structural engineering, project management, and design services for commercial, residential, and mixed-use developments across New England.
How long has JSN been in business?
JSN has provided engineering services since 1987, maintaining continuous operation for over 35 years in the construction industry.
What types of projects does JSN handle?
We specialize in commercial developments, historic preservation projects, and mixed-use buildings with complex structural requirements.
Do JSN engineers work on historic buildings?
Yes, our team has extensive experience preserving historic structures while implementing modern engineering solutions in Portsmouth's historic districts.
What areas does JSN serve?
While based in Portsmouth, NH, we serve clients throughout New England including Massachusetts, Maine, Vermont, and Connecticut.
