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Triangle Service Center

Average Score
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
5.0
(2,581 Reviews)
96
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Score Details

Last 30 Day Trend

Active Business

ReScore Reviews

ReScore
Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5
Original Review
Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5
0
Total ReScores
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ReScore Average
96
Net Promoter Score ®

Business Details

About

In 1978 with more than 10 years in the automotive repair field under his belt, David McAllister bought the gas station at the apex of Concord and Boston roads. During the initial land surveying it was noticed that the land configuration was indeed a perfect “Triangle.” The rest of the naming was easy, due to the variety of automotive In 1978 with more than 10 years in the automotive repair field under his belt, David McAllister bought the gas station at the apex of Concord and Boston roads. During the initial land surveying it was noticed that the land configuration was indeed a perfect “Triangle.” The rest of the naming was easy, due to the variety of automotive repairs planned during the future; the second half had to be “Service Center.” The site, more than three decades old, is now a landmark used by many to give directions to either Carlisle or to the Bedford area. Take a right at Triangle to go to Great Brook Farms in Carlisle or a left to go to the town soccer fields.

Today, Triangle is still family owned with David's son Peter McAllister manning the helm. We are proud of our heritage and even more proud of the service we have been able to provide through the years to the motoring public in the Chelmsford, Carlisle, Billerica, Westford, and the greater Lowell area.
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Categories
Auto Repair, Car Maintenance, Tire Sales and Repair
Contact
(978) 256-7658

Business Hours

Mon
7:00 AM - 5:00 PM
Tue
7:00 AM - 5:00 PM
Wed
7:00 AM - 5:00 PM
Thu
7:00 AM - 5:00 PM
Fri
7:00 AM - 5:00 PM
Sat
closed
Sun
closed
* Eastern Time (Us & Canada)
177 Boston Road Chelmsford, MA 01824-4615
Triangle Service Center's Reviews
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
5.0
(2,581 Reviews)

DO
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DAVID / JOAN O.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
08/01/2025
verified customerVerified Customer
10
Excellent Service
I trust these guys so much. They have been awesome and never recommend a service that isn’t needed!!

LS
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LAURA S.
Carlisle, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/31/2025
verified customerVerified Customer
10
Great service
I switched to triangle service center two years ago for my truck- they are great, professional, organized, and willing to problem solve.

JL
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JOHN / ANNETTE L.
Carlisle, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/24/2025
verified customerVerified Customer
10
Best service anywhere!
You and your car are their first priority. Great care, timely advice, no BS.

Verified Customer
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/23/2025
verified customerVerified Customer
10
Great Service Provided
Nicho provided a quick cost estimate of the repairs needed in my car and advice on what was needed now versus later with detailed explanations, which i really appreciated. Overall cost for the repairs was much better than other places i quoted. I will definitely keep using Triangle service center in the future.

RZ
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ROBIN/DAVID Z.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/23/2025
verified customerVerified Customer
10
Honda service
I have been using Triangle for decades and they always provide excellent service. I trust their advice and their work. My Honda is 14 years old and they help me to keep it running in top condition. I found this summer that the AC was not working as it should and they provided the necessary work to fix it so it is like new again.

CM
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CHERYL M.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/21/2025
verified customerVerified Customer
10
Inspection Service
It is a supreme pleasure to do business with Triangle. They are personable, professional, timely, and knowledgeable. If only the rest of the world managed their customer service the way this auto repair shop does!

Verified Customer
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/17/2025
verified customerVerified Customer
10
Clear concise communication
Needed to get my vehicle towed and knew I could trust Triangle. They listened to the issues, provided the information I needed, gave a quote and a time estimate and executed the work. Everything went as I expected based on prior experiences. A job well done again.

KG
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Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/17/2025
verified customerVerified Customer
10
Wonderful experience
Great job on my older pickup. Nice clean waiting room. I'm sure the shop is also clean and neat.

DS
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DOMENIC S.
Westford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/09/2025
verified customerVerified Customer
10
Great service as always
This Team is money, great communication and a great service.
Thank you.

DT
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DONNA T.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/08/2025
verified customerVerified Customer
10
Oil filter change and inspection
My oil was extremely low. They didn’t have an appt available for a week. They were concerned and squeezed me in their very busy schedule. Always friendly and helpful.

TB
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TOM B.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/04/2025
verified customerVerified Customer
10
Great service
Triangle never disappoints with reliable, honest service. Our Cadillac was delivered on time and at the price that was quoted. I strongly recommend Triangle for all of you automotive service needs.

EP
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ERNEST / RENA P.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/02/2025
verified customerVerified Customer
10
Highway tow incident
My car lost an underside plate on the highway. It was towed to Triangle where it received prompt attention and diagnosis. As always, Triangle was reliable and honest. Much appreciate having them on my team!

PK
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PETER K.
Concord, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/02/2025
verified customerVerified Customer
10
Nice easy service visit
Great, complete anb no-nonsense service, kind and courteous front desk folks, very detailed notes on car's condition. Thank you!

Verified Customer
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/01/2025
verified customerVerified Customer
10
Reliable and trustworthy shop with advanced diagnostic capabilities.
Triangle Service Center successfully diagnosed and fixed a persistent winter problem with my car: a peculiar water leak from the roof rack directly into the electronic panels, which prevented the car from starting. They resolved the issue by refitting new gaskets and sealant to prevent any future leaks.

Since moving to the area, I've exclusively relied on Triangle Service Center for all my car's maintenance and repairs. Their service is consistently reliable and trustworthy.

Verified Customer
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/01/2025
verified customerVerified Customer
10
AC recharge
Had engine replaced earlier this year, Nicho is super responsive and the mechanics are great, would recommend to anyone.
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