Design-Build Mechanical Contracting and Commercial HVAC across Massachusetts

A family owned business since 2000. In house design led by a licensesd Profressional Engineer (PE) on staff, backed by an unwavering commitment to quality and customer satisfaction.

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About Us

For over two decades, J.S. Mortimer, Inc. has partnered with commercial, industrial, and institutional facility managers across Massachusetts. We bridge the gap between complex engineering concepts and field execution—delivering comprehensive mechanical solutions from initial load calculations to full-scale mechanical installation and ongoing lifecycle service.

Complex Environment Expertise

We specialize in mission-critical facilities with zero room for error—including active healthcare wings, research laboratories, art museums, and institutional boiler plants.

Single-Source Accountability

From preliminary design and permitting through industrial pipefitting and equipment startup, having in-house engineering means fewer change orders, faster approvals, and a direct line of communication.

Mechanical Support

Quality extends far beyond system install. Our service and start up technicians are widely regarded as the best in New England, bringing over 30 years of field-tested trade experience to every emergency call, diagnostic check, and preventive maintenance inspection.

Leadership & OfficeTeam

Expertise. Reliability. Integrity

Family-owned since day one, our leadership team sets the standard for how we do business across Massachusetts. We believe open communication and long-term relationships start from the top, and we take pride in being a dependable partner you can always reach directly.