Family Owned and Operated

Our business is built on our family values of honesty and integrity and our reputation for excellence which we have developed with over 40 years of experience in the construction industry.

Quality Craftmanship

We carry out every project with passion, care and attention to detail, and this commitment to excellence is reflected in the craftsmanship of our work.



Our reputation for excellence has allowed our business to grow exclusively through word of mouth referrals. In addition to being insured we are fully licensed as a class A contractor.

About Cornerstone Construction

Located in historic Front Royal, Cornerstone Construction has served the Shenandoah Valley area and beyond since it was established in 2005. As a family owned and operated business we take pride in our craftsmanship and bring integrity and honesty to every project.

In addition to being insured and fully licensed as a class A contractor we are a member of the Home Builders Association of VA and Trex Decking Partners.


Originally from upstate New York, Chris along with his wife and kids moved to the Shenandoah Valley area in 2002. He continued to work in construction as he had done in NY until he founded Cornerstone Construction in 2004. Chris passed on his passion for carpentry and stone masonry to his sons who began helping out with labor until they got enough experience to help manage operations.

The McMahon’s pay special attention to every brick they lay, especially the cornerstone, as this stone is the is the stone that forms the base of a foundation. Two of the McMahon sons now have part ownership in the company and continue build with care and passion.” 

Our Services

New Construction

Building the home of your dreams is a big undertaking. Let us help you make it a reality. We can build you a home perfect for your family’s needs, on schedule and on budget.


Let us breathe new life in to a dated or damaged home. Whether you are looking to remodel a single room, or the entire house, we are happy to assist you. In addition to working with newer homes we also specialize in restoring historical, old buildings and houses.

Basement Renovations

Take advantage of every square foot in your home with our basement renovation solution. A new media room, guest room or play room for the kids —don’t let this useful space go to waste.

Visit our sister company’s website! We are Trex Certified and do decks of any kind. We will work with you to create your dream outdoor space! Schedule a free estimate on our website today!

A Few of Our Projects

Flowers in Chania “Cornerstone Construction delivered a beautiful sunroom addition with a fantastic experience. The communication was excellent—at various times we worked with Chris, Sam, and Nick. Information passed among them without my seeing it; whoever was here knew what was going on, did the work that was promised, and kept me apprised of next steps. All of the staff were extremely respectful and helpful. They are truly a pleasure to work with!” Nan Grambo, Linden VA

Flowers in Chania

“We were thrilled with both the design and the craftsmanship of the project of finishing our basement which Cornerstone completed for us. It turned out beautiful and functional for our needs. Marty and his team were considerate of our kids and their interest in the project and communicated their schedule and progress to us regularly. We will definitely be using Cornerstone Construction for our future home renovation needs! ” -Luke and Kristin Fier

Flowers in Chania

“We hired Cornerstone Construction to build a large addition on our home which included a new kitchen bump out, added a master bathroom and second new bathroom along with mudroom suite at the front of the house. Marty, sam and chris were very friendly to work with and did a great job on the renovation. Thanks so much.” – Noel Sweeney

Flowers in Chania

“The McMahons and their team are consummate professionals. They give you a quote and stick to it, show up every day until the job is done (weather permitting) and provide top notch renovations or new build. We will use Cornerstone forever. There’s no one else we trust with our home.” – Chris Estes and Jenn Rigger (renovation of a kitchen and a master bath and build of a new deck.)

Flowers in Chania

“Being active duty military for 28 years and with all of our travels, we found Cornerstone Construction most professional meeting our expectations in completing deck extension, back porch enclosure with fire place, and more. We recommend them highly.” – Captain and Mrs. Scott Cooper, Front Royal, VA