Find Engineers You Can Count On in Portsmouth, NH

CSI Engineering is a multidisciplinary MEP/FP engineering firm providing mechanical, electrical, plumbing, and fire protection design services since 1996. We specialize in creating efficient building systems for commercial, residential, and historic structures across New England and nationally. Our team of licensed engineers combines decades of experience with cutting-edge technology to deliver code-compliant, sustainable solutions tailored to each client's unique needs.