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Leading the Way in Mechanical Construction and Service

Ensuring the highest level of construction performance is what makes us the company you want on your next project.

Who Are We?

Harold Brothers Mechanical Contractors, Inc. is a privately held, open shop mechanical construction company in Eastern Massachusetts. Part of Being a full service organization for the Commercial Construction Industry, we have the ability to provide a total mechanical construction package including HVAC, process piping, refrigeration, plumbing, pre-fabrication, rigging, energy management and temperature control. We provide our customers with a single contact able to offer a comprehensive approach to their mechanical systems.

We work all over the state of Massachusetts including Cape Cod and the islands and into Southern New Hampshire.

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Our Services

Fabrication

We operate a full production shop for the fabrication of piping systems for plumbing and HVAC. The controlled environment allows us for better quality and we can produce more in a shorter period of time. Our fab shop has helped our customers with both completion time and money spent on projects.

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HVAC

From a routine installation to a complex fast-track design/build project, we can provide any type of HVAC service, including new construction, intricate process piping, and tenant fit-up and retrofit.

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Plumbing

We offer a wide range of commercial plumbing services. Our plumbers have a broad experience in many facilities, including biological and chemical research laboratories, medical centers, universities, retail, and hi-rise condos.

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Design Build & Design Assist

Harold Brothers excels in collaborating with engineers and owners, streamlining the design assist process from planning and equipment selection to installation while optimizing costs and timelines. Need an engineer? HBMI partners with 3rd-party engineers to design systems tailored to any architectural layout.

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Process Piping

Our skilled work force installs process piping for a variety of sectors, including heavy industrial, pharmaceutical and hospital facilities. From small tenant fit-outs to design build services we can handle any of your process needs.

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Coordination

The CAD department coordinates and designs mechanical and plumbing systems based on engineered plans, resolving conflicts with other trades. They also use the coordinated model to create fabrication and spooling sheets for the fabrication shop.

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Service Department

Our service technicians are highly skilled and factory trained; with a large base of employees we have a wide variety of technical specialists. We are experienced in proper troubleshooting of both commercial HVAC and Plumbing systems.

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Our Clients

Here are just a few examples of the projects we have worked on in the past. 

Testimonials

“Harold Brothers Mechanical Contractors is my trade partner of choice with both plumbing and HVAC scopes of work. Execution and delivery are always at a very high level. Their winning culture is driven down from both Patrick and John – The Best.”

Sean Edwards, VP Operations - Suffolk Construction

“In my experience, Harold Brothers has proven to be an excellent mechanical contractor. The mechanics onsite worked safely and produced quality work. In closing, I am confident that given the opportunity, Harold Brothers Mechanical will be a valuable addition to any project team.”

Ryan Dessert, Project Manager - Wise Construction

“As an owner I love when projects go smoothly and run on a tight, timely schedule – Harold Brothers goes above and beyond to make sure this happens. They have asserted themselves as an elite subcontractor in the mechanical industry – I always look forward to the next project with Harold Brothers.”

Andrew Maher, Owner - Anchor Line Partners

“I would like to commend Harold Brothers Mechanical Contractors, Inc. for an outstanding job on the New Nantucket Intermediate School. From man power to materials, the schedule was managed effectively throughout the project and as a result the project was delivered on time and within the budget. We look forward to working with the Harold Brothers team again in the near future.”

Robert Brait, Project Manager - Brait Builders Corp.

“We can depend on Harold Brothers Mechanical from start to finish. They are always a team player and have earned the reputation as a premier subcontractor from performance, safety and quality with Callahan Construction.”

Patrick Callahan, President - Callahan Construction Managers

“Harold Brothers has been a trusted partner for many years on projects both large and small. They have always been extremely responsive, professional, and team oriented which is why they are such a pleasure to work with which is rare to find. I look forward to doing business for many more years to come!”

Michael Fish, President & CEO - Dellbrook / JKS

How Can We Help You Today?

Set up a call so that we can help you meet any of your plumbing or HVAC challenges head on. 

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