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    Cornerstone Openings

    5.0 (59 reviews)
    Open 8:00 am - 4:00 pm

    Cornerstone Openings Photos

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    Reviews With Photos

    Sarah W.

    Had to have our screen door serviced and they did a fantastic job! Luke was very timely with his communications and they were able to get us in quickly. Highly recommend!

    Before

    We purchased a LaCantina folding door. We were referred to Sean at Cornerstone Openings by a neighbor. We met with one other contractor, but we knew we wanted to go with Sean and his team due to their professionalism and reputation. We worked with Sean and Dave and they answered all our questions and were true to the timeframe they committed to. Their price was very reasonable. They used Harkin Construction, and they were a great team, and very efficient. The door adds so much light and has been great when entertaining. Wished we had done it sooner.

    Three doors!
    Chelsey T.

    Hands down the best construction company we have ever worked with. We are on our third home now in San Juan Capistrano and have used them each home to install our beautiful bifold La Cantina doors. Sean the owner Is always on it! We love all his employees and we are so thankful for this company that works so beyond hard to please their customers his employees have worked for him forever. They are a happy company doing the best out there!

    Four panel 8ft bifold, door, two panel bifold passthrough kitchen window
    Tim C.

    I bought some bifold doors and sliders 3 years ago from Cornerstone. They have held up great and any little issue we have had over the years Cornerstone is super responsive and comes and adjust the doors very fast. I honestly didn't expect the service to be so great as most companies sell the product and you never hear from them again. The purchase process was very transparent and easy. I plan on purchasing two more doors from them in the next few years.

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    Page 1 of 2

    Ask the Community - Cornerstone Openings

    Review Highlights - Cornerstone Openings

    Sean replied to my text immediately and had David call me, come by and make the necessary adjustments.

    Mentioned in 28 reviews

    Read more highlights

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    OC Window Experts

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    I had a great experience with OC Window Experts from start to finish. Their team was incredibly…read morehelpful, and the customer service was outstanding throughout the entire process. The pricing was very fair and competitive, which made the decision even easier. Mike, the owner, was honest, transparent, and extremely helpful every step of the way. He took the time to answer all my questions and made sure I felt comfortable with everything. The installers, Willy and J.C., were professional, polite, and very respectful of my home. They did a fantastic job and made sure everything was clean and perfect before they left. I highly recommend OC Window Experts to anyone looking for quality work, great service, and fair pricing!

    It could not possibly have been an easier and more satisfying experience hiring OCWE to update our…read more60 year old windows and slider on our house. We met with Mike (the owner) at his showroom who went through every option and provided clear details for the products we had to choose as well as the process from start to finish. We went with Mike's product recommdation, Anlin Windows, based on those details which was clearly the right choice. Mitch (the ops manager/job forman) came to our home at the appointed time, took the measurements and advised what we needed to do to assist in the installation process which was basically moving any large objects away from the windows, both inside and out. In fact, we were contacted every step of the way from the owners, office staff and field staff and advised of the progress of our order. We were notified of the windows arrival at thier warehouse 6 weeks later and set up an installation date. JC and Willy arrived on time and got started right away after thanking me for clearing thier work areas as thoroughly as I did after the intial walk through. They did an amazing job. They were courteous, clean, respectul, and completely professional in every way. They had every window plus a very large slider installed before the end of the day and once again complimented and thanked me making their work areas accessible and easy to work in. They also left every area they worked in cleaned up as if they were never there. A rarety these days! JC then provided me with some tips specfic to any potential screen door squeeks and advised me to apply something on the screen to prevent any accicdents in the form of me or anyone else walking through that screen. I used a couple of thin strips of duct tape. The windows/screens are obviously new and almost transparent. Especially after living with the previous extruded metal OG windows for as long as we did. He showed me the features of each window and door, explained how the locks worked on each and answered any questions I had. There was minor 1 hiccup. During the unpacking process of the windows, JC pointed out to me that 1 of windows would not be able to be installed as it arrived broken. Not the window itself but the top right corner of the exterior vinyl overlap. The damage was not seen at the warehouse as it was under the protective card board/plastic and must have happened during the shipping process from the factory. I know from experience these things happen and it is how they are reacted to that seperates the good companies from the bad. OCWE took care of it without hesitation and insisted I deduct $500 from the intial installation balance until the replacment was installed and the job completely finished. The replacement was rush ordered. I was told it would take 2 weeks to get it. I got a call extactly 2 weeks later and we set up the installation appointment. The final window was just installed in under 30 minutes by JC and Willy as I had requested they come back for the aformentioned reasons. My wife and I could not be more pleased and satisfied with the choices we made specific to the company, product, pricing and professionalism of every team, top down from sales, ops and installation. We would do it again in a heartbeat! I highly recommend OCWE for window/slider upgrades in every way and when you do, make sure you specifically request JC and Willy to install them. You will not be sorry!

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    Offshore Construction replaced all the windows in our house. When my wife and I decided to have our…read morewindows replaced in our home, we sought out many companies and contractors to get quotes. The quotes were kind of all over the place, so at first making a decision was a bit overwhelming, that is until I went on Anlin's website (window manufacturer) and they referred us to Offshore Construction. I called and spoke to Ben (owner) and was pleasantly surprised I didn't get that used car salesman kind of guy on the phone. Ben was very down to earth and upfront. He came out gave us a very competitive quote we felt confident Ben @ Offshore was the one. When ordering he was very informative on types of windows, frames, and hardware. Estimated lead time was perfect. Day of installation Ben's crew showed up. I was explained exactly what they were going to do, as well as explained as they were going along what was happening. Extremely comfortable crew, very trustworthy, I would not have hesitated for one moment to leave them all here if I had to go run errands, to me that's a big plus. His crew was professional, respectful and just plain nice guys. Everything was top notch, the windows are quality, the full double life warranty is amazing, and if I had to do all over again I would 100% use Offshore Construction again. Excellent job by excellent people!

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    Mike and his team were great! Very knowledgeable and professional. Highly recommend for all your…read moreglass, windows or sliding door needs. I called to see ask about my windows since the seal on the inside of our double panel window was coming off. I thought I would need to get new windows but Mike said all I needed to do was to get new glass. He came to give me to estimate and do the measurements. Afterwards, the glass order is placed and another schedule is needed to do the work. Altogether, we got 5 windows repair. On the day of, Mike even fixed our sliding door! The door has been so hard to open over the past 18 years. He knew exactly what was wrong with it and fixed it right then there. The difference from before and after is literally night and day. Thank you for everything Mike.

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    We'd been having issues with our entry door for a while. The door is more than 80 years old. And…read morenow, it had started rubbing against the side wall and no longer sat evenly in the frame. It was clear it was time for a replacement. Before choosing James, I got a quote from a very popular windows and doors company in Orange County. James, the owner of Lucero's Windows and Doors, not only offered the best price but was also extremely responsive. He mentioned that he previously worked as a Home Depot installer, which gave me confidence that he was properly trained. I was initially cautious because of the low number of reviews, but the consistent perfect scores from other customers made me optimistic. Now, after working with him, I can confidently say that Lucero's Windows and Doors is the real deal. Because our home required a custom-sized door, James came out twice to take measurements. After about two weeks, the custom entry door arrived, and he completed the installation in a single day. He told me our home was one of the oldest he's worked on, and the walls were very different from newer builds. Despite the challenges, he made everything fit perfectly, and the final result looks fantastic. We no longer feel a draft under the door, and it swings smoothly without any issues.

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    Cornerstone Openings - doorsales - Updated May 2026

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