About Us

With over 45 years of experience, owner Harold Sinn has gained incomparable expertise in the construction industry that ensures we'll get the job done right every time. At Bri-Co Construction, our team of professionals is dedicated to providing state-of-the-art services that are built to last. We specialize in building durable retaining walls that are as functional as they are beautiful. From grading and remodeling services to deck installation and new construction, we’re prepared to complete your project on time and under budget. Give us a call today for a free consultation -- you’ll be happy you did.


Excellent Company! Owner Harold Sinn present during work stages. Workers very professional and very easy to do business with. No surprises on cost. 

- Mary H.

Removed a railroad tie retaining wall approximately 110 ft long by 4 1/2 ft high and replaced it with blocks.

Bri-Co Construction was the lowest bidder out of 4 total bids. Working with Harold Sinn of Bri-Co was an extremely pleasureable experience. He explained the process from start to finish before he started the work and responded to any concerns I had during the work. He never failed to immediately return any calls I made or emails I sent asking questions. I am not a retaining wall specialist but I must say that the end result is absolutely beautiful. I will call them again when needed and will recommend them to any friends or relatives that ever need their services.

- From Angie's List

I had a great experience with Bri Co, we ended up reducing the scope of the bid and they were just as interested. Harold the owner was timely with his communication throughout the
process and his crew was professional and did quality work. 

- Laurin F.

 They did great work, very responsive, super at customizing to meet my needs. 

- Daniel F.


- Terry B.

 Very much enjoyed my interactions with Harold Sinn (the owner of Bri-Co) in this summer. His crew members are very responsive and professional. The finished work is impressive, superb, superior, and indeed secondary to none. My landscaping completed changed with new retaining wall, patio, fence, and upper deck with two stairs; now they look unbelievably BEAUTIFUL! Harold Sinn's Bri-Co is strongly recommended for your associated projects. 

- Ping A.


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Location & Hours

Bri-Co Construction

O'Fallon, MO

(314) 581-4076



7:00 am – 5:00 pm


7:00 am – 5:00 pm


7:00 am – 5:00 pm


7:00 am – 5:00 pm


7:00 am – 5:00 pm


7:00 am – 5:00 pm



Get in touch

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