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Cornerstone Management Services - CMSBigSky

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Gallatin Gateway, MT
Cornerstone Management Services - CMSBigSky

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Protecting and progressing our community by redefining exterior building performance.

Cornerstone Management Services, also referred to as CMS, is an exterior envelope contractor proudly serving and located within the Big Sky, MT, community for 20 years. Our focus is building long term, sustainable exterior systems specifically designed and tested for high alpine environments. Our scope focuses include but are not limited to roofing, cold roof design/framing, metal siding installation, and below/above grade waterproofing.

10/26/2026

10/19/2026

Proud to be part of the first-ever Cold Climate Conference in Montana.

A huge thank you to everyone who made it happen, especially James, Ali, and Teran for taking on such a massive endeavor. Bringing the industry together right here in our backyard made this one pretty special.

We’re grateful CMS got to be part of it, and we hope this is only the beginning.

Already looking forward to the next one.

09/24/2026

Special Project Spotlight: Custom Metal Chimney Wrap

Some projects are too unique for our standard service categories. We call these Special Projects.

This chimney wrap was completed by our Service & Maintenance team in Gallatin Gateway. The homeowner wanted to replace the existing wood siding with something more durable, lower maintenance, and better matched to the forged metal details already used around the home.

Big shoutout to the team for going above and beyond to get the details right, keep the homeowner happy, and learn a few things along the way that we can carry into the next project.

We just added the full project to our website, including more on the process and photos from start to finish.

Have an exterior project you’ve been thinking about for a while? CMS may be able to help bring it to life.

See the full project at the link in our bio.

09/21/2026

Good cause. Great crew. Pretty decent scorecard! The CMS team knows how to finish a roof AND a golf round (finally!).

Congrats to Alex, Kazz, Brandon, and Connor for taking first place at the MSU Lacrosse fundraiser tournament.

We’ll take the win, but the better part was getting to support MSU Lacrosse and be part of a great event with the community.

Thanks for having us out, and shoutout to everyone who helped make the tournament happen.

(not pictured.. our trophy… what is pitcured is the infamous Copper Cup …Thanks Cats for letting us hold a piece of history)

09/15/2026

WE’RE HIRING A SALES REPRESENTATIVE.

CMS is looking for someone who creates opportunities rather than waits for them.

If you’re comfortable prospecting, networking, following up, building relationships, and taking ownership of your results, we want to hear from you.

$60,000–$65,000/year + commission
Full-time | Office in Big Sky Area | Servicing Gallatin & Madison County
Potential hybrid work arrangement after training and approval.

Learn more and apply at cmsbigsky.com/careers or find our website link in bio

09/09/2026

A great day on the course with the Big Sky community. It’s always good to step away from the jobsite, spend some time with the community, and enjoy a little friendly competition.

Thanks to the Big Sky Chamber for putting on another great golf tournament and bringing so many local businesses and community members together.

A special shoutout to Hannah from P&PG for grabbing these photos of the our team, and to Kevin Butler of Butler Advisory Group and Engel & Völkers for being part of a great day.

Thanks again to everyone who made it happen.

08/27/2026

Safety will always come before speed, shortcuts and savings.

Today, the CMS team completed safety audits with the Montana Building Industry Association and Monty Jensen. Exercises like this give us another set of eyes on how we work, where we can improve, and how we can continue building safer job sites for our team and everyone around us.

Being connected with organizations like MBIA helps keep us sharp, current, and accountable when it comes to safety standards and best practices.

There is always more to learn, and when it comes to safety, that matters.

Thank you to Monty and Montana Building Industry Association for spending the time with our team today. Great job Sophia, Ollie, and Tristan.

08/25/2026

Watch the full film at the link in bio.

20 years in Big Sky teaches you a few things.

How to adapt. How to solve problems differently. How to keep learning. And, sometimes, how to plan for the unplannable.

Our new film looks back at where CMS started, who we are today, and what we’re carrying into the future.

20 years in. 20/20 on what works.

08/20/2026

Twenty years is worth celebrating. The people behind those 20 years are what make it meaningful.

Thank you to our team, families, clients, partners, vendors, friends, and community for showing up, supporting us, and helping shape CMS into what it is today.

Seeing so many people come together to celebrate this milestone was a special reminder that the CMS story has always been about more than just us.

A special congratulations to Andy on 20 years with CMS and Tom on 10 years with CMS. Two milestones worth celebrating and a lot of years spent helping shape the company we are today.

We’re incredibly grateful for the first 20 years and excited for what comes next.

20 years in. 20/20 on what works.

08/05/2026

Help us celebrate two decades of great work, strong relationships, and community.

For 20 years, CMS has been fortunate to build lasting relationships with the employees, clients, partners, friends, and neighbors who helped shape our company.

Now it’s time to celebrate together.

Join us for an open house at CMS Headquarters featuring food, drinks, raffle giveaways, commemorative swag, and the premiere of our special 20 Years in Big Sky video.

Friday, August 14
3:00–7:00 PM
CMS Headquarters
176 Running Iron Road, Gallatin Gateway

Video screening at 4:30 PM
Words from the CMS team at 5:00 PM
Raffle giveaway at 6:00 PM

This is an open invitation to the community. We hope you’ll join us as we celebrate the past 20 years and look forward to what’s next.

RSVP to [email protected] by August 10. RSVP is appreciated, but not required.

20 years in. 20/20 on what works.

Address

176 Running Iron Road
Gallatin Gateway, MT
59730

Opening Hours

Monday	8am - 5pm
Tuesday	8am - 5pm
Wednesday	8am - 5pm
Thursday	8am - 5pm
Friday	8am - 5pm

Telephone

+14069932533

Website

https://cmsbigsky.com/

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