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Serving Connecticut Infrastructure Since 1897


A Legacy of Integrity, Pride & Versatility

Our Family-Owned SBE sets the standard for heavy construction expertise

We perform a wide range of services for regional municipality, utility, and private market clients in need of top-notch, reliable construction and demolition.

Core Competencies

John J. Brennan Construction is among the largest & most experienced full-service infrastructure contractors in Connecticut

Both our Utility and Site Development divisions take pride in offering high-quality hands-on management. Our clients are leaders in CT infrastructure and business development, and give John J. Brennan high marks for project quality, knowledge and innovation. They continue to hire us year-after-year, because we have proven to deliver work done right without hassles or surpises.

The Brennan legacy epitomizes a standard of pioneering innovation and the integration of state-of-the-art technologies. Our team comprises dedicated, skilled, and certified professionals who are deeply passionate about our work. Furthermore, our unwavering commitment to safety has been consistently recognized through numerous prestigious awards and accolades earned over the years.

Clients Include


Our Work


Aquarion Water Co. | Stratford, CT


Payden Field | Derby, CT


PSEG Power | Bridgeport, CT

Family is Our Foundation

Since 1897, John J. Brennan Construction has been a steadfast presence in Connecticut, with its roots tracing back to the entrepreneurial spirit of Thomas Brennan's son in Shelton, CT. Our longstanding business has been a cornerstone of the local community for four generations.


Eric and Matthew Brennan now set a bright course for the future, following in the footsteps of their great-grandfather. Our family’s unwavering commitment to excellence, along with our faithful team of hardworking professionals and outstanding customer service continue to uphold the company's legacy and reputation.



Our performance is the foundation on which our reputation is built, ultimately leading to our customers' satisfaction. This satisfaction, in turn, fuels their willingness to engage us for future challenges.


Through our work with various clients, Brennan has refined our skills across multiple projects, each presenting unique circumstances and demands. From hospitals to universities, we have navigated tight work spaces, adhered to strict schedules, and catered to specific environmental requirements with precision and expertise.

"I have had the pleasure to have these guys work on my property in Naugatuck. Everyone I have dealt with, from Timothy to Brandon, have been courteous and very professional. They worked with me with the logistics of my property and thee challenges it brought. But I have to especially thank Nick and his partner... These guys went above and beyond their responsibilities to make sure that we were comfortable and that the work was done well and to the specifics. I have dogs, and he would make sure that they were secured by knocking on our door before actually starting the day. Before leaving he would go over with me what he had done and what needed to be done. This is a rare thing nowadays... I would recommend those guys to work anywhere. Great Job guys!" 

Ramon S.

"Great company to work with and one of the most knowledgeable construction companies in Connecticut, especially for large complex jobs."

Justin H.   

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