A wide range of services for markets in need of top-notch, heavy construction expertise.


Excavation, road building, utility installation, paving, demolition – we’re on it.

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Why do the area’s top utility companies rely on Brennan?

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Top-quality product, plus a serious recycling program.

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Millings, cold patch, hot mix – it’s all right here.

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Portable tracked crushers save us time – and you money.

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We’re a Class A licensed demolition contractor.

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Safety is an Obsession

Our commitment to crew safety is more than inspiring, it’s award-winning.



At John J. Brennan Construction, we understand that our employees are our greatest resource. It’s their knowledge, and their experience, that allow us to continuously exceed our customers’ expectations.

To that end, we’re always seeking qualified and motivated professionals to build our team.    

Brennan is a union shop.
We utilize union labor and have agreements signed with the International Union of Operating Engineers, Local 478, as well as the Connecticut Laborer’s District Council of the Laborers International Union of North America. We strictly adhere to all training and licensing requirements for our personnel.

Naturally, Brennan is an equal opportunity employer.

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Heavy Experience

Fourth-generation Brennans carry on a tradition of heavy construction excellence throughout New England. What makes a company thrive for nearly 120 years? A respectful approach to construction that’s free of hassles, free of agendas, free of surprises. Customers expect an outstanding job at a fair price – Brennan people make it happen.

  • They really said that?
    Word-of-mouth is the best advertising.
    Charles V. Firlotte / President & Chief Executive Officer ,
    Aquarion Water Company

    My affiliation with J.J. Brennan has covered a twenty five year period… Their responsiveness and attention to client needs are second to none . Their personnel are technically proficient, and the firm prides itself on its occupational health and safety performance…  

  • They really said that?
    Word-of-mouth is the best advertising.
    Chris Gamber / Senior Project Manager ,
    John Moriarty & Associates

    All work performed by John J. Brennan Construction Co. was done professionally and safely and they consistently met or exceeded the requirements of every project — from quality, to maintaining schedule and budget, and in offering the depth of resources necessary to provide additional support to projects at critical times.

  • They really said that?
    Word-of-mouth is the best advertising.
    Mike Modine / Director of Operations ,
    Project Service LLC

    I would highly recommend the services of John J Brennan Construction Co. Their dedication to accomplishing their work was in line with our goals, and the quality of work provided was far above industry standards. They are a great company and it was a pleasure doing business with them.

  • They really said that?
    Word-of-mouth is the best advertising.
    Robert A. Friend / Vice President, Procurement,
    PSEG Services Corporation

    We would like to express our personal thanks…for the tremendous support that you and your firm provided to PSEG during Hurricane Sandy and its aftermath. Through teamwork and an unprecedented work ethic, we collectively were able to safely return to service critical generation capacity within weeks of the storm. Your efforts to support PSEG and its customers during these trying times were truly commendable, and are greatly appreciated.

  • They really said that?
    Word-of-mouth is the best advertising.
    Edward O. Norris / Vice President, Asset Management ,
    South Central Connecticut Regional Water Authority

    Brennan is one of our "A" contractors. They consistently perform excellent work, are very responsive to our needs, and complete projects on time. Their executive team, led by David Brennan, is a pleasure to work with. I highly recommend Brennan to other contracting organizations or agencies.