About Cornerstone Insurance LLC

OUR MISSION

At Cornerstone Insurance LLC, our mission is to provide trusted, transparent, and tailored insurance solutions that give our clients peace of mind in every stage of life. We believe in building long-term relationships through integrity, education, and a commitment to putting our clients first.

Founded in 2010 by seasoned agent David Boiter Jr., Cornerstone Insurance LLC was built on a simple promise: to protect what matters most with insurance solutions that are personal, practical, and rooted in trust. Backed by over 20 years of industry experience, David launched Cornerstone in Easley, South Carolina, to serve individuals, families, and businesses with clarity and care.

Today, our experienced team—including a knowledgeable in-house staff and 20+ independent agents across multiple states—remains committed to exceptional service. As an independent brokerage, we work directly for you—not the insurance companies—to deliver tailored coverage at the best price. From Medicare and ACA plans to home, auto, life, commercial, and farm insurance, we’re proud to be your Cornerstone for reliable insurance solutions.

Beyond traditional insurance services, we are dedicated to enhancing the well-being of our clients. Through our sister company, Healthbridge Diabetic Shoes, we support Medicare patients by providing high-quality diabetic shoes, aiming to improve their health and mobility.

At Cornerstone Insurance LLC, we are more than just an insurance provider; we are your trusted partner in securing a strong and protected future.

Your Trusted Insurance Partner

Because Life Doesn’t Come with a Guarantee

01.

Independent & Unbiased

We work for you, not the insurance companies, so you get customized coverage at competitive rates.

02.

Comprehensive Coverage

From home and auto to commercial, agriculture, Medicare, and life insurance, we handle it all under one roof.

03.

Local Experts, Personalized Service

No call centers, no runarounds—just real people who genuinely care about protecting what matters to you.

04.

More Than Insurance

We go the extra mile, even providing high-quality diabetic shoes for Medicare patients through our sister company.

Real People. Real Expertise.

Real Reviews From Clients.

At Cornerstone Insurance, we’re more than just insurance agents—we’re your trusted advisors, problem-solvers, and neighbors. With a dedicated office staff and a network of over 20 independent agents licensed across multiple states, our team brings decades of experience and a personal touch to every policy we write.

See what our clients say about us below.

Amyzing Gracie

Sandy is so helpful with quotes and answering all of my questions with any situation. I won't use any other insurance agent from here on out.

Greg Telley

Sandy Garrison was instrumental in saving us money on our home and car insurance. She was able to transfer the services from one company to the other with ease. Sandy is knowledgeable in her field and does a great job of answering any questions we may have. I would refer my friends and family to her for their insurance needs.

Jack Newsome

Insurance agent Sandy Garrison was very knowledgeable and helpful when I went to her office looking for insurance. At the time, I was only looking for auto insurance. She found me great coverage at a very reasonable rate. I later purchased home owners insurance. Sandy is a terrific lady who really knows her job. I recommend her highly.

Brittany P

Sandy has helped us out from the time we moved here almost 2 years ago. I was nervous changing agents as I moved from a different state but they have truly made it an easy move. I highly recommend Sandy

henry usery

I was a loyal insured with another insurance company for 35 years and Sandy saved us over $600.00 a year by switching FROM Geico!!! Thank you, Sandy!

Mac Dawg

I switched to Cornerstone Insurance in mid 2020. Both David and Sandy have been absolutely incredible! They're friendly, polite, knowledgeable, timely and always helpful! They will always help you, even knowing it may not benefit them. I promise you, you will not be disappointed!

Acacia Telley

Always willing to work with us ! Great company ! Paige and Sandy are the bestttttt

Shelby Millington

Sandy Garrison is an amazing agent. This was my first time needing full coverage, and being young and a college student rates are pretty high as you can imagine! However Sandy did her best and found the best rate out of anyone! She was very prompt, precise and friendly! She seemed to genuinely care about helping me out, and that mattered. She even answered her phone on weekends, and after hours, and investigated why the prices changed on my quote. I highly recommend her and cornerstone!

Peggy Gillespie

I have never been happier with an insurance agent! Sandy has helped me so much with my auto insurance. She is very knowledgeable and I HIGHLY recommend her!

Ashley martinez

Wonderful customer service. They we able to fix an issue for us and give us a better rate. Definitely need to check them out. Not only will they help you out but they will save you money because this company cares.

Bettina Koepke

Very fast, friendly and reliable!!! Can't get better than that!

Eric Feeney

Sandy Garrison saved me almost $1000 a year on Car insurance vs State Farm and now I have even better coverage and lower deductible than before. Amazing!! You will never know unless you go and see for yourself!

Amanda Reames

Very pleased with Sandy and all her hard work.. She worked hard to get me a get quote saving me half the money i was spending.. Shes very knowledgeable and polite. Id refer anyone to her..

bailey burgwyn

Sandy and Paige saved me a ton of money on my car insurance. Thank You!!!! Bailey Burgwyn

Geoff Weinstein

Sandy Garrison is awesome! Got me a huge discount on my auto / rental combo. Really quick, fantastic and friendly service! I'm satisfied!

Daniel Ripperger

Awesome for 3+ years. Has helped me with auto, home, and motorcycle insurance .

Kevin Jw

I have been a client for several years now and I have to say by far the best experience I’ve ever had with an insurance agency. My Agent, Sandy is a life saver. She has followed my file closely and personally and it is evident when she communicates with me on how she is monitoring my file to keep me with the best possible coverage for car and renters insurance. The staff is very accommodating to my needs and will do everything possible to make sure I’m protected, and not paying more than required while still keeping me with top tier providers. Thanks you Cornerstone, and big thanks to Sandy “best agent ever”!!!!

Jay S

Sandy was very knowledgeable and helpful in transitioning us from our previous agency to Safeco. We took out two auto and a homeowners policy. I would recommend Cornerstone insurance to everyone who is looking for someone with integrity and was compliant and most of all to save you money!

Alicia Bower

Sandy Garrison is an amazing agent!!! very friendly and willing to go that extra mile to help with getting the best rate available!!!!!

Daniel Johnson

Sandy Garrison is the real deal very friendly outgoing caring and very knowledgeable.I've been knowing Sandy forca couple of years now and she always delivers and comes through for her clients. If you want and need an experienced agent who cares about the customer first then I recommend calling Sandy Garrison at Cornerstone Insurance for all your insurance needs, best agent in the upstate

Morgan

Sandy Garrison is phenomenal! She is always willing to go the extra mile and help me with any questions I have about my policy. Thank you for everything, we really appreciate having an insurance agent that is always just a phone call away.

Paige Telley

I was so impressed with how much Sandy saved me on my car insurance and homeowners insurance. Sandy shopped around for me and found me a great deal. I would recommend Cornerstone to all my friends and family.

Kristen Cooper

Sandy is hands down the best insurance agent I've ever worked with. She is very knowledgeable and takes her time to pair you with the policy that makes the most sense for your coverage needs and your wallet! I have two teen drivers and she has helped me reduce my insurance premiums by $100's of dollars! There is no one else I would give my business to when it comes to auto, home, and renters insurance.

Nikki Young

Best customer service! My agent makes me feel like part of the family. 5 stars, highly recommend.

MICHAEL GAILLARD

Sandy Garrison is a very personable, knowledgeable, industrious, and caring person who Always goes the extra mile to find me the correct insurance coverage at the very best price! When I switched to Cornerstone, my savings were significant! On a personal note, you could not find a nicer, more knowledgeable agent to work with. She is always prompt to return calls and follow up after you have requested changes to your policy. I can Highly recommend Cornerstone and especially Sandy Garrison!!!

Caroline Morgan

Sandy was very helpful with getting me the best possible, affordable quote on insurance for my truck. She makes it easy to pay all i do is give her a call and it's paid. No hassle with automated lines, she answers all my questions and I'm very happy with my car insurance experience with Cornerstone! They will have my business.

Aja Posey

LOVE THIS PLACE!! SANDY GARRISON IS ONE OF THE BEST AGENTS!! SHE IS TRULY DEPENDABLE AND HAS HELPED SEVERAL CLIENTS I HAVE SENT HER!! SHE IS A TRUE BLESSING TO THE COMPANY😍