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Serving Delaware, Chester, and Montgomery Counties and surrounding areas. Focusing in full customer satisfaction... guaranteed

General Info
Company History With over 30 years experience as a General Contractor and Builder, Tri-County is a leader in residential and commercial construction, renovation, and remodeling. The owner and operator Thomas Thornton has completed projects ranging from $Million custom home sites from southern Delaware County to the Main Line to additions, kitchens, baths, and all types of remodeling and renovation. The company is fully insured and employs only individuals fully qualified in their respective trades. Tri-County General Contracting is dedicated to quality workmanship and on time completion of all projects with complete customer satisfaction. As a family owned and operated business Tri-County is able to offer real face to face interaction throughout a project and address customers concerns as they arise. Josh Thornton, Tom's son is a master carpenter and graduate from West Chester University College of Business Management. He is involved in every job and is there taking just as much pride in every piece of work, as his father does. Josh grew up working with his father and continues to work as an important part of this family owned business.
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Extra Phones

Phone: (610) 558-3180

Payment method
all major credit cards, amex, cash, check, discover, financing available, master card, visa


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Paulette L.



Tom is a rare breed of contractor. He shows up and does the work himself with his helper, John. They arrive, clean, on time, and with knowledge of the job ahead. Tom cleans the job site daily. He worked on my kitchen remodel which morphed into the downstairs because i kept adding more to the job.

Tom and John moved windows, replaced siding, gutted my kitchen, installed the cabinets, knocked through a masonry wall to create a doorway to my dining room from the kitchen., and added studs where needed. They installed all the tile in my kitchen, mudroom, and powder room beautifully. Sometimes, I'd forget to compliment them because they make the job look effortless.




After a fire that totaled our house, Tom Thornton and Tri-County General Contracting helped us rebuild from the foundation up. Tom provided an enormous amount of help to us in planning, working with the township, negotiating with the insurance company, designing (finding us a wonderful architect), and of course putting together a beautiful new house. Tom is a pleasure to work with. He is honest, generous with his time and expertise, fair in pricing, flexible with the plans, and proud of the quality of his work. His teams were equally professional. They did quality work in a timely manner. They were courteous, caring for the property, cleaned up at the end of each day; they were responsive to our questions, and their work consistently matched Tom’s high expectations. Tom promised us that he could build the house in 3 to 4 months – and he met that goal, in spite of delays and set backs with inspections and insurance issues. We’ve been in the new house a year now, and we love it. We have nothing but high recommendations for Tom Thornton and Tri-County General Contracting.

 Jim, Helen and Ciara Kain

 Glen Riddle, PA



Sunroom and Bathroom Remodel

We contracted with Tri-County to completely remodel a sunroom and full bathroom. Several contractors were included in the bidding process, and we selected Tri-County and Tom Thornton based on his knowledge and experience, professional and service-oriented personality, and competitive price.

In the Sunroom, Tom installed 12 casement windows, a french door, and framed and dry-walled 4 walls and ceiling. Vinyl siding was installed on the outside. The floor was leveled with concrete and he installed a wood floor. The bathroom was completely gutted, the configuration of bathtub was changed and plumbing modified, and tile work was installed on the walls and floor. Other contractors told us our design could not be accomplished. But Tom was able to build exactly what we envisioned so we could take advantage of our small, 7x8' full bathroom.

We also chose Tri-County because we felt we could trust Tom Thornton with the remodel while we were out of the country, and he proved to be very trustworthy. Tom kept us informed of the progress, requested approval for any scope or material changes, and was very responsive when we needed to discuss any questions or issues. When the job was completed, Tom continued to be responsive to questions.

Tom handled unexpected issues promptly as to not impact the schedule, including reframing two walls due to a carpenter ant infestation. Most importantly, he completed the project on time before our move in date. He knew how important it was for us to move in on the date we planned, and he put in a series of long days and nights to complete the bathroom prior to our move in date.

At the same time, I was also remodeling the kitchen and doing much of the work myself. As a new homeowner, I didn't know how to efficiently complete what I signed up for. Tom proactively helped me with his knowledge and also whenever I asked.

Tom used competent sub-contractors. The plumber I have actually re-hired for another job.

I will use Tri-County in the future and also highly recommend them to family and friends.



2 Story Addition with new bath, renovated bath, 2nd floor laundry and more...

Tri-County General Contracting was hired to build an addition on our home. The addition was to be 2-story with a 1st floor mudroom, new full bathroom, family room; the 2nd floor was to have a new bedroom and a laundry room. In addition, the scope included a new roof for the whole house and a total renovation of an existing bathroom. We hired Tri-County after a competitive review of three contractors and while Tri-County’s pricing was very competitive, Tom Thornton was clearly more prepared to discuss our scope in detail which gave us great confidence in his abilities. In the end, our addition ended up being better than we had originally planned and we attribute that to Tom’s knowledge and skills. At the beginning and throughout the build process, Tom was able to provide us with a lot of ideas and suggestions based upon his many years of experience. Many of these ideas did not necessarily drive up the cost as much as significantly increase the functionality of the home. We feel that we clearly obtained a significantly higher “bang for our buck” as a result of hiring Tri-County. As mentioned in another review, we also experienced the same considerate scheduling and behavior where Tri-County took the time to minimize the impact to our on-going life through the process. Breaking through to the existing house, shutting down the only existing bathroom, working with neighbors (we have a shared drive-way), and many other small yet significant matters were well thought out and executed to our complete satisfaction. At no point did we feel less than comfortable with Tom as it was obvious that his focus is on doing a GREAT job at a fair price. We certainly feel that way and will be recommending his firm when folks inquire. In the business of Home Contractors, we all hear the horror stories, but our experience with Tom Thornton and Tri-County has given us the new benchmark for great execution and final satisfaction. In a world where price, quality and schedule rarely come together to the satisfaction of the customer, Tri-County pulled it off...and yes, we would certainly call Tom again.



Our House Renovation

My husband and I were thrilled with our little ("retirement house") rancher. Then a family emergency forced

us to take in our daughter and a disabled grandchild. Not only did we need a bigger house, we needed a house

equipped to handle a disabled person.

"Tri-County Builders" had converted an outdoor porch into a beautiful rec room w/fireplace a few years

before, so we immediately called Tom Thorton and his crew to help us again. It was a huge job, but Tom

and his helpers arrived faithfully every day for months and months. The men who worked on our house were

wonderful with our grandchild, and we quickly considered them "friends" rather than workmen. The day our house

was completed, I was actually sad to see them move on to another job.

Unlike some other builders, who leave a job to run out and work on another, Tom and his men were on our

job every day until the job was fully completed. Our "new house" is beautiful and strangers have come

knocking on our door asking for the name of our contractor. We always tell them to call "Tom the Builder"

at "Tri-County General Contracting".

Jerry and Ruth O'Connell, Newtown Square, PA



Reliable, High Quality Craftmanship

Tom put a large kitchen/family room and office addition on our home in 2006. With many contractors, there are significant delays in the start time and completion time of the project. Tom started the project exactly when he told us he would. He was accomodating and kept all of the work outdoors until after right after the Christmas holidays for us. Right after New Year's he broke through the house and worked hard to minimize the disruption to us. We had him completely gut our kitchen and put a big addition on. Yet, we were only out of our kitchen for a couple of weeks. Tom's attention to detail was impeccable and we were thrilled with the quality of the work. He offered great suggestions throughout the project which we wouldn't have thought of ourselves. Our roof design was not quite complete, but Tom actually picked up where the architect left off and figured out how to craft a complicated roof design and integrated it with our existing roof line. He was meticulous in his work and in minimizing the mess and disruption in our home. He finished the project right on time. He and his team were a pleasure to work with. We would highly recommend Tri County Construction.



Addition including Kitchen, Bath and Laundry Room

We always recommend Tom Thornton and Tri-County General Contracting to all of our family, friends and neighbors. He stayed within our budget and was true to our projected timetable for completion. We also found his crew to be reliable, on time and they even cleaned up the work area daily! Tri-County General Contracting created a space that was much more than we could ever have imagined!


Phone: (610) 329-2880

Address: 960 Smithbridge Rd, Glen Mills, PA 19342


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