Business Details
30 Years
experience
Expert MEP/FP Engineering Services in Portsmouth, NH
Founded in 1996, CSI Engineering has evolved from a mechanical coordination firm to a full-service MEP/FP engineering design company serving clients across New England and beyond. Our three principal engineers, with combined experience exceeding 100 years, lead every project directly, ensuring technical excellence and personalized service. We specialize in mechanical, electrical, plumbing, and fire protection engineering for diverse sectors including historic buildings, healthcare facilities, educational institutions, and commercial spaces. Our team's construction background provides unique insights into real-world buildability challenges, while our LEED-certified consultants deliver sustainable solutions that balance environmental responsibility with operational efficiency. With offices in Portsmouth, New Hampshire, we maintain active involvement in every project phasefrom initial design to final implementationwhile adhering to strict deadlines and budgetary constraints.
Services
HVAC Design
Electrical Engineering
Plumbing Systems
Fire Protection
LEED Consulting
Code Analysis
Building Renovations
Energy Efficiency
System Audits
Facility Upgrades
Details
- Year established: 1996
Highlights and features
- Three principal engineers with 100+ combined years of direct project involvement
- Specialized expertise in historic building systems preservation
- Full-service MEP/FP engineering under one roof
- Proven track record with LEED-certified projects
- On-site evaluations and customized system recommendations
Associations and certifications
- LEED AP
What people say
Great team
Deliver on time
Efficient systems
Creative solutions
Responsive consultants
Services
HVAC Design
Our HVAC design services create energy-efficient climate control systems for commercial and residential buildings. We specialize in clean room environments, laboratory ventilation, and geothermal solutions while ensuring compliance with current codes. Our engineers optimize ductwork layouts and equipment selection to balance comfort with operational costs for both new constructions and retrofit projects.
Electrical Engineering
We provide comprehensive electrical system design including power distribution, emergency lighting, and EV charging infrastructure. Our services cover lighting analysis for sports facilities, power solutions for data centers, and code-compliant electrical systems tailored to specific building requirements across various industries including healthcare and education.
Plumbing Systems
Our plumbing engineering covers domestic water systems, medical gas piping, and industrial waste management. We design code-compliant systems that optimize water conservation while ensuring proper functionality for commercial kitchens, laboratories, and healthcare facilities through detailed piping layout analysis and material selection.
Fire Protection
We engineer fire suppression and alarm systems for diverse environments including aircraft hangars and computer rooms. Our services include hydraulic calculations, code analysis, and specialized suppression systems using foam, gas, or high-expansion agents to meet specific facility safety requirements while maintaining operational continuity.
LEED Consulting
Our LEED-certified consultants provide sustainability strategies for energy-efficient building design. We offer gap analysis, energy modeling, and certification guidance to help clients achieve environmental goals while optimizing building performance and reducing long-term operational costs through proven green technologies.
People
John E. Cass
Principal and Founder
With 39 years of HVAC engineering experience, John graduated from Wentworth Institute of Technology and leads mechanical engineering projects while maintaining active professional licensure.
Jim O'Brien
Chief Electrical Engineer
A Master Electrician with 35 years of experience, Jim oversees electrical design projects and holds LEED accreditation for sustainable building systems analysis.
Jason Churches
Mechanical Engineer
Licensed in multiple states, Jason brings 16 years of mechanical design expertise to commercial HVAC projects while managing engineering standards across design teams.
Domenic Ciolino
Fire Protection Engineer
With 23 years in fire protection engineering, Domenic specializes in suppression system design for complex facilities using advanced hydraulic calculation methodologies.
Eric Pflugradt
Plumbing Designer
A 26-year plumbing design veteran, Eric focuses on commercial and institutional plumbing systems with expertise in specialized waste management solutions.
Questions
What engineering disciplines do you offer?
We provide mechanical, electrical, plumbing, and fire protection engineering services with LEED-certified consulting capabilities.
Do you work outside New England?
While based in Portsmouth, NH, we complete projects nationwide and internationally with remote collaboration capabilities.
How do you handle historic building projects?
Our team combines code compliance with preservation techniques to maintain historic integrity while modernizing building systems.
Can you assist with system evaluations?
Yes, we offer on-site assessments for existing systems including code analysis and efficiency improvement recommendations.
What industries do you specialize in?
We serve healthcare, education, historic preservation, commercial, and industrial sectors with tailored engineering solutions.
How do you ensure code compliance?
Our engineers maintain current code knowledge and perform detailed analysis to meet local, state, and federal regulations.