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    Cornerstone Windows & Patio Doors

    4.3 (91 reviews)

    Services - Cornerstone Windows & Patio Doors

    Door installation

    Window installation

    Window replacement

    Cornerstone Windows & Patio Doors Windows Installation Photos

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    Recommended Reviews - Cornerstone Windows & Patio Doors

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    Tom H.

    The crew topped themselves this time when we went back to order a new higher UV large picture window plus install crank-out side windows and then swap out another large side window for a slider that gives us so much afternoon breeze. The entire house is cooler in more ways than one. Tony went above and beyond to get us installed on the same day the product came in. Can't give them all high enough marks. They have made their mark in the Hollywood Riviera specifically and in the South Bay in general. Next project: A new front door. Already have it scoped out!

    Window

    Cornerstone was recommended to us by a friend and I'm glad we took their suggestion. Tony and Jacob (father and son) are super easy to work with and their entire team did a fantastic job. They were crystal clear with communicating what needed to be done and the timeline. You can stop by their workshop to see their products as well. Their windows are high-quality and I highly recommend them.

    WE COULD NOT BE MORE PLEASED WITH OUR DOORS!!! We chose Cornerstone Windows & Patio Doors to replace our front and kitchen doors. Our home is 79-years old and to do this right, the doors needed to be custom made. Tony, the owner recommended, we selected fiberglass versus wood. It's difficult to see the difference and they will last decades. The many choices of styles and fixtures were our toughest choices to make! Tony's team, Antonio, Jake and Mike were very professional and respectful. They worked so well together. Tony delivered 100% and has been serving the greater South Bay for 25+ years and we highly recommend him.

    Tony was offered help before the first repair and straight up told/shown that the sealant wasn't working before the second repair.

    To anyone considering Cornerstone, feel free to message me. I'll be happy to give a reference with a lot more details of what happened, now that the inspections and repairs of the work he left behind for me to deal with are complete. I encourage you to verify everything with Tony, especially what he wrote in his reply, and judge for yourself.

    After photo of area they fixed

    I used Cornerstone for a tricky curved window replacement project. From the beginning Tony was great to work with. The install team is excellent and I brought up an issue and they were quick to fix it. We also had some dry rot and they were able to make the windows and the surround look like new. I'm so happy I found Tony and his great team. Would hire them again!!

    Joan S.

    From their Yelp reviews, I knew they'd be good. But still, I was apprehensive (meaning scared half to death). Because....I've replaced window glass before but never big picture windows including the frame. I expected broken glass everywhere, worried about my cat impaled on shards....all kinds of worst case scenarios. But...nothing bad happened. No mess, no glass shards. I feel a bit foolish. Speaking of the cat, he started this whole thing. A neighbor's cat comes around at night to taunt my indoor cat thru the windows. I heard loud crashing sounds one night, only to discover my cat hurling himself against a window, his entire body, to get at the other cat whom he now hates with a passion. My cat is ready to fight for his territory. Then, after weeks of cat pounding on a big window that's probably original to my old house...a crack in the glass appeared. And slowly got bigger. No point in replacing just the glass. The old aluminum frames were shot. Cornerstone to the rescue. Rob came out (on time) to tell me the cost & take measurements. I let him decide the style of windows cuz he certainly knows more about this than I do. His recommendations turned out to be perfect. He's great. I met Maggie in the office when I dropped off the deposit check & have spoken to her since. She's great, too. I didn't get any other estimates, btw, had already made my decision before Rob arrived based on the reviews, a contractor's recommendation, and the fact that Cornerstone is local. And their price seemed very fair, as I expected. I decided to do both windows in the room instead of just the cracked one. Cornerstone has its own crew, nothing is farmed out. That's important to me. Antonio & his crew of two came (on time) to do the job. And what a wonderful job they did. My new fancy-schmancy Simonton energy efficient windows-with-the-works are gorgeous. Much too good for this old house when compared to some of the other original windows. So I'll likely replace more old windows at some point. And an exterior door. I now have sliding panels (with locks) on the new windows for more ventilation. And new screens of course. The whole room is brighter. And the room is cleaner than it was before the crew got here. No mess whatsoever. These installers are pros. And nice guys. The day I had stressed over ended up being fun. To my cat: You cannot break these hurricane-resistant windows so knock yourself out, kiddo (not literally I hope). On second thought.....knock yourself out.

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    11 months ago

    I had recently purchased a home and needed help with two windows. I had an excellent appointment with the tech.

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    4 years ago

    Tony and his team are great! They have put in new windows at several houses we own. He is experienced and you will be satisfied.

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    2 years ago

    Love my patio door. Anthony and his partner did the best job. Very respectful. Did my windows some time ago, also very happy still.

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    Thank you for the great review, Tom!

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    Thank you for the wonderful review!

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    Page 1 of 3

    Ask the Community - Cornerstone Windows & Patio Doors

    Do you repair/replace French screen doors?

    Alex, Unfortunately, we do not replace or repair screens. Thank you, Cornerstone

    View All 3 Questions

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    Cornerstone Windows & Patio Doors - windowsinstallation - Updated May 2026

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