Building Strong Foundations With Pride, Family & Integrity
Experienced excavation and underground utility experts. Honest work, fair pricing, and free quotes on every job — because your dream project deserves a solid start.
Built on pride, family and the good Lord above
Cornerstone Excavation and Pipe Fitting LLC was built on pride, family and the good Lord above — who blessed us with the skills to perform all kinds of excavation, pipe fitting and threading.
With more than 15 years in the underground utility services trade, we want our customers to feel free — free to call, free to speak, and most importantly free from headaches. Our mission is simple: turn your project into real life with honest work and craftsmanship you can stand on.
Family Owned
A tight-knit crew that treats every job like it belongs to our own family.
God Driven
Faith-inspired values guide the way we work and the way we treat people.
15+ Years
Seasoned in excavation, underground utilities, pipe fitting and threading.
Honest & Fair
Straight answers, fair pricing, and free quotes on every project.
Underground expertise, above-ground integrity
From the first shovel to the final grade, every job gets our full attention. Here's what Cornerstone brings to the site.
Excavation
Site prep, grading, trenching and earthwork done right the first time — with equipment and know-how built for the job.
Underground Utilities
Water, sewer, storm and service line installation and repair. Clean trenches, tight joints, dependable results.
Pipe Fitting
Precision fitting for residential and commercial systems. Every seam handled with care and craftsmanship.
Pipe Threading
On-site and in-shop threading built to spec. Clean cuts, tight seals and pipes ready to perform under pressure.
Driveways
Fresh gravel driveways, culverts and access roads that hold up to Michigan weather and everyday traffic.
Consultation
Not sure where to start? Talk with us — we'll walk your site, listen to your plans, and help you move forward.
The reasons neighbors keep calling back
Pride in Every Job
We don't cut corners — we finish jobs we're proud to stand behind.
Family Values
Built by family, run like family. We treat your property like it's our own.
Honest & Fair Pricing
Straight quotes, no surprises. If a job is simple, we'll tell you.
Experienced Professionals
15+ years underground — we've seen the ground you're standing on.
God-Driven Work Ethic
Faith is our foundation. Kindness and integrity guide every job.
Fresh dirt. Solid work. Real results.
A look at the kind of work we're proud to put our name on. Every project starts with listening and ends with a handshake.
Trenching & Site Prep
Underground Utility Install
Fresh Gravel Driveway
Precision Threading
The Coulter family behind Cornerstone
Cornerstone is a family operation. Every member of the team shares the same values: pride, honesty, and taking care of the people we work for.
Randall Coulter
Owner
Reed Coulter
Owner
Rylie Coulter
Office
Samantha Coulter
Company Lawyer
Free quotes. Honest work. Fair prices.
Every project is different — and pricing should reflect that. Prices vary based on job description, site conditions and the work involved. We want to be honest and fair, so we start every conversation with a free quote, walked through together, no pressure.
Free, no-obligation quotes
Transparent pricing tied to the actual work
Straight answers before, during and after the job
No hidden fees — ever
Every job priced on its own merit
A driveway on flat ground is a different animal than a trench through clay and root. We won't pretend otherwise — we'll come look, listen, and give you a number you can trust.
Words from the people we work for
"Cornerstone showed up when they said they would, worked hard, and left the site cleaner than they found it. Honest crew — you can tell they care."
"Fair quote, no runaround. They walked me through the job, answered every question, and got our underground line installed without a hitch."
"A true family business. Randall and Reed do what they say they'll do — that's rare in this trade. We'll be calling them again without a doubt."
Ready to break ground? Let's talk about your project.
Free estimates, straight answers, and 15+ years of underground experience — one call away.
Free quotes. Real conversations.
Call, text or send us a note. We'll get back to you personally — no phone trees, no runaround.