Innovative Engineering for a Sustainable Future

Delivering high-quality mechanical, electrical, plumbing, and fire protection engineering solutions for exceptional facility design and energy management.

About Us

Since 1950, Gillan and Hartmann, Inc. (G&H) a 3rd generation run family business, has provided comprehensive investigative, design, rehabilitation, and construction support services in all facets of building systems, mechanical, electrical, plumbing and fire protection engineering for public and private clients representing a wide range of businesses, industries and governmental agencies. With a portfolio of over 5,000+ completed projects exceeding $2.75 billion in construction value and less than 0.5% in change orders, Gillan and Hartmann applies its specialized expertise to improve the quality of the building environment and promote safety.

Projects completing

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Worth in Projects completing

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Headquarters

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Services We Provide

Engineering Capabilities

For 3 generations, G&H has been providing operations management and professional consulting engineering services, with expertise in the renovation and upgrade of buildings and utility systems.

Electrical Building Systems

G&H has completed more than 400 projects involving analysis, design and cost estimation of optimum electrical solutions for industrial, institutional, residential, and commercial applications.

Design Build Project Delivery

Gillan & Hartmann, Inc. (G&H) has completed more than 1000 projects involving engineering analysis, design, code application and compliance, cost estimation and optimization of electrical systems.

Fire Protection Building Systems

G&H has completed more than 400 projects involving engineering analysis, design, code application and compliance, cost estimation and optimization of Fire Protection Building Systems.

Mechanical Building Systems

We have completed mechanical building systems design for more than $1 billion of mechanical construction involving engineering analysis, design, code application and compliance, cost estimation, and more.

Our History

Jack P. Hartmann, P.E.

1914 – 1982, Founder

John P. Gillan, P.E.

1937 – 2024, Founder

M. Steven Gillan, P.E.

President

Testimonials

Friends Hospital, Philadelphia, PA

“As President & CEO of Friends Hospital, I relied on G&H’s outstanding, budget-conscious engineering services to maintain our 100-acre, 192-bed facility. Their responsive, deadline-driven approach ensured our facilities supported a positive patient experience. A trusted partner—highly recommended!”

– Wayne Mugrauer, President and CEO

Peirce College, Philadelphia, PA

“For over 20 years, G&H has delivered prompt, responsive, and economical engineering services to Peirce College, from major renovations to critical assessments, supporting our mission of quality education.”

– Vito R. Chimenti, Manager, Auxiliary Service

Four Star Consultants

“Thank you for your team’s outstanding work on the Operations, Maintenance, and Support Services plan for Curran Fromhold Correctional Facility (CFCF). Your expertise ensured Philadelphia effectively managed unforeseen challenges, contributing to CFCF’s long-term operational success since 1995.”

– Thomas J. Costello, President | Retired Commissioner

Contact Us

Let’s Build a Smarter, Sustainable Future Together.