Spanning seven generations of family ownership, James J. Welch & Co. has more than 165 years of experience in construction management and general contracting services for small and large projects across New England.


Since 1852, our team of professionals has specialized in general contracting, construction management, complex renovations, design-build services, site evaluation, and high-end residential.


J.J. Welch works on a wide range of project types including commercial, institutional, medical, residential, hospitality, athletic, recreational, religious, historical, and more.


What our clients are saying

JJ Welch was the General Contractor hired to complete our Landlord scope of work for a new retail tenant at one of our Shopping Centers in the Greater Boston Area. From the RFP stage to project delivery and addressing punch list items, JJ Welch has been professional, prompt and trustworthy. This job encountered many unforeseen obstacles and JJ Welch handled them flawlessly by not letting them affect the schedule and by providing cost efficient solutions. In the end the project was delivered ahead of schedule and under budget exceeding our expectations and paving the way for a successful tenant fit-out.

Charles F.

Kimco Realty

At every step, they were extremely responsive and available. When the unknowns became known, they helped guide us through the options and always pushed for the best value solution without losing the integrity of the final project. […] Not much more we could have asked for!

Mark DiPasquale

Archimedia Solutions Group

JJ Welch was very responsive, easy to work with and stood by their work. The bid, contract, billing and project management were all well-organized and prompt. I would definitely work with them again in the future.

Mike Derse

Learning Express Toys

We are so incredibly thrilled with the work Justin and his crew completed on our kitchen and bathroom in our condo in Back Bay. Both Justin and Joel led us through every step and were extremely communicative, professional, clean, and efficient. There was no such thing as an obstacle for these guys – they just got the work done no matter what it took. The newly renovated space is absolutely beautiful and I would very highly recommend working with Justin. We will definitely use them again for future projects!

Rebecca Nahill


Justin & Justin at JJ Welch helped us with our renovation and construction of an urgent care clinic in Swampscott. Justin Welch was an absolute pleasure to deal with- tough, smart, honest, fair and very responsive. There will always be problems in any construction with unknown unknowns and you want someone you can rely on to be fair and open and work with you to solve those issues. These guys go above and beyond.

Zaka Shafiq

President at AFC Urgent Care

JJ Welch did a fantastic job on building out our brewery and restaurant! Honest communication and a fantastic staff all around. They really went above and beyond to make everything beautiful and were a pleasure to work with. Can’t recommend enough.

James Razsa

Democracy Brewing

As a business owner… I love when people deliver on what they say, and keep there word. J.J. Welch bent over backwards to give just what we wanted.
The crew worked hard from the time they showed up, until Justin handed me the keys, to the absolute most beautiful Salon in NewEngland…(no exaggeration). And we opened when we planned… right on time.

John Korpusik

Fringe Salon