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Business Details
32 Years
experience
Trusted Civil Engineering Services in Mattituck, NY
Condon Engineering is a family-owned and operated business established in 1994 in Mattituck, NY. Our team brings over 50 years of combined professional experience in delivering comprehensive engineering services to the Long Island community. We specialize in structural, electrical, HVAC, plumbing, and civil-site engineering, ensuring projects meet local codes and standards. Our expertise extends to forensic engineering, pre-purchase inspections, and HERS energy ratings, with a focus on residential and commercial developments. We have completed notable projects including the Publick House Micro Brewery, Tuckahoe School addition, and ELI Hospital electrical upgrades.

Our engineers hold certifications from recognized institutions and maintain memberships in professional organizations like the National Society of Professional Engineers. We prioritize client satisfaction through tailored solutions, technical precision, and a commitment to improving energy efficiency and structural integrity. Our legacy of referrals reflects our dedication to quality and community-focused engineering.
Services
Structural Engineering Forensic Engineering HERS Rating Civil-site Engineering Electrical Engineering HVAC Engineering Plumbing Engineering
Details
  • Year established: 1994
Highlights and features
  • We offer 50+ years of combined engineering experience in Long Island's unique regulatory environment.
  • Our family-owned business prioritizes personalized service and technical precision for every project.
  • We maintain deep familiarity with Suffolk and Nassau County building codes and standards.
  • Our team provides certified HERS energy ratings to improve home efficiency and reduce costs.
  • We have completed over 2,500 residential and commercial inspections since 1994.
Associations and certifications
  • Energy Star Rater
Services
Structural Engineering
Our structural engineering services ensure safe, code-compliant designs for residential and commercial buildings. We analyze structural components like beams, foundations, and framing systems to meet project-specific requirements. With expertise in both modern and historic structures, we deliver solutions that balance durability with aesthetic considerations.
Forensic Engineering
We investigate structural failures and building defects to identify root causes and provide repair recommendations. Our forensic analysis covers material testing, construction defect evaluations, and pre-purchase inspections. This service helps clients understand existing issues and implement cost-effective remediation strategies.
HERS Rating
As certified Energy Star Raters, we conduct Home Energy Rating System evaluations to measure residential energy efficiency. Our process includes thermal imaging, air leakage testing, and performance analysis to generate HERS Index scores. This service supports energy-efficient construction and identifies opportunities for cost savings.
Civil-site Engineering
We provide comprehensive site engineering for residential and commercial developments, including grading, drainage, and septic system design. Our team ensures compliance with local regulations while optimizing land use for projects ranging from single-family homes to large-scale commercial developments.
Electrical Engineering
Our electrical engineering services cover system design, load calculations, and code compliance for new installations and upgrades. We specialize in commercial electrical systems, including service augmentations and emergency power solutions, ensuring safety and reliability for all project types.
People
John J. Condon Sr.
President
Licensed NY professional engineer with 50+ years of experience. Founded Condon Engineering in 2001 after careers at NYNEX and Bell Labs. Holds BSEE from City College of New York and certifications from NSPE, NABIE, and ASHI.
John J. Condon
Vice President
Licensed NY professional engineer with 15+ years of experience. Joined firm in 2006 after working at civil engineering firms in Nassau and Suffolk Counties. Holds BSEE from Roger Williams University and ASCE membership.
Questions
What engineering services do you offer?
We provide structural, electrical, HVAC, plumbing, civil-site, and forensic engineering services, along with HERS energy ratings for residential and commercial properties.
How does the HERS rating process work?
Our certified raters analyze building plans, conduct on-site inspections, and perform energy testing to generate a HERS Index score that measures home efficiency.
What areas do you serve?
We primarily serve Long Island, including Suffolk and Nassau Counties, with expertise in local building codes and municipal requirements.
What experience does your team have?
Our engineers have over 50 years combined experience, including 2,500+ inspections and projects ranging from single-family homes to large commercial developments.
Reviews (1)
V. Flo
Apr 05, 2021 Report
Condon Engineering enjoys a stellar reputation, and they answer every single call. They are professional, responsive, and versatile in every facet of engineering, both mechanical and structural. Why someone would be so mean spirited to post a one star rating for not returning a during the CoVid pandemic is Not nice.