More Than Doors & Windows.
Complete Peace of Mind.

Why pay more for less?

With showrooms in Costa Mesa, Dana Point, and La Jolla, Cornerstone Openings has proudly served Orange County and San Diego for over two decades. Offering premium windows and doors, exceptional service and support and unmatched value—with the most competitive pricing in the market, Cornerstone Openings consistently meets—and exceeds—customer expectations.

Sales

Curated systems from leading brands, selected for quality, performance, and timeless design. Our expert team guides you to the perfect fit for your project—every time.

Support

Exceptional service begins before installation and continues long after. Our support team is known for responsiveness, expertise, and a commitment to your complete satisfaction.

Logistics

End-to-end coordination from factory to final fit. We handle scheduling, storage, and delivery—protecting your investment and keeping your project on track.

Installation

Precision installation by trusted professionals. We ensure every product is installed to manufacturer specifications, delivering beauty, longevity, and peace of mind.

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  • “I had the pleasure of working with Cornerstone during the renovation of my new home. While vacationing in Hawaii, I was inspired by the seamless indoor/outdoor living lifestyle. I was thrilled to And a company that could bring that same experience to my home. They helped me visualize the transformation through their design, and the results completely surpassed my expectations.”

    Tom Gallaway, Coto de Caza

  • “From start to finish, we found that Cornerstone Openings has stood behind their promises and their products. I would not hesitate to engage Cornerstone Openings and Sean’s team in any major project that requires new doors and windows.”

    Mr. Tang, Laguna Beach

  • “The install was completed in four days and the results are spectacular. The doors were installed perfectly and the stucco you replaced on the outside of the doors matches perfectly. I really appreciated how your team went the extra mile to help us relocate some of our exterior lights outside of the doors.”

    Andrew Tinseth, San Clemente

  • “Throughout our build, we worked with over 20 different subcontractors, and Cornerstone Openings stood out above them all. Their service, communication, and attention to detail were unmatched. I can recommend them with 100% confidence—the final products and experience were truly superior.”

    D. Hancock, San Clemente

  • “Excellent service and communication. Sarelle was very easy to work with. Prompt with information and delivery. I definitely highly recommend.”

    Erin B., Encinitas

  • “Your team treated my home like it was yours, and cannot give a better endorsement then that!”

    Bill Conlon, Ritz Cove

  • “Cornerstone’s design and solutions made the space truly spectacular.”

    Steve Lawler, Laguna Beach