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Alexander Our honest, and highly trained service department is committed to providing each and every one of our door and window customers with complete satisfaction, no matter how large or how small the job. Alexander Co. has a wide selection of replacement windows and doors from the leading manufacturers, all at competitive prices. Come check out our online showroom of doors & windows to see pictures of our beautiful line of products.

Whether you are in the market for replacement window and doors, door repair or window repair, or window installation services, Alexander Co. offers the broadest range of styles and materials in the San Francisco Bay area.
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Alexander Company is a family owned and operated business that was started in 1971 and has since served thousands of customers throughout the Bay Area. As a family business we take pride in our work and we are committed to provide the highest quality service to our customers. Alexander Company is a family owned door and window business that has been proudly serving the San Francisco Bay Area for over forty years.
At Alexander Co., we encourage you to come check out our wide selection of beautiful windows and doors for yourself. No matter what your home's door or window needs are, you're sure to find something that's just right for you within our enormous inventory, featuring pieces from the world's top door and window manufacturers.
Alexander company is proud to carry Therma-Tru Entry Doors. Therma-Tru entry door systems are the brand that most builders and remodelers prefer. Every line of doors from Therma-Tru comes with a package of performance that is unrivaled in the industry. With a front door by Therma-Tru, not only will you see an increase in comfort, energy efficiency and performance, you will also see an increase in curb appeal. In fact, you can increase the perceived value of your home just by adding a Therma-Tru entry door system.*.
Some of the first things visitors will notice about your home or business are the doors and windows. Make the right first impression and choose the experts of window and door installation in the San Francisco Bay Area. Choose the professionals at Alexander Co. for all your window installation and door installation needs in the Bay Area.
Reviews (39)
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Steven W.
Jun 25, 2022
Not happy with our experience, the installation process started smooth but when they installed the incorrect handle set it left a mark on the new door. We had to wait for a touchup kit, after touching the door up it just didn't look right. We had a tech come out, 2 weeks later, he tried to do a touch up and now I wished we never did the door. $4600 this is the result of our front door installation (see photo). Wouldn't recommended based on our experience.
Sue W.
Jun 09, 2022
Alexander Company is the best -- not only for doors and windows -- but the customer service and quality. I made an appointment for the initial contact and Walter showed up on time, took measurements within minutes, and showed appropriate catalogs taking into consideration what I wanted. He even saved me money by pointing out comparisons. He was honest as to how long it would take to build the door.

Their installation gentleman, Jose, is absolutely the best. He initially set up a wall tent to protect our house during the installation. He is meticulous and takes pride in his work. He's currently teaching a younger worker to be exact, careful, and enjoy the process. I noticed that Jose reviewed his work from gauging the size of trim needed to caulking.

He even adjusted the height of the peephole in the door to accommodate the steep stairs. He truly is a master. I'm so glad I went through Alexander Company to get exactly what I wanted. I mean I only buy a door once every 20 or 30 years and this one will last.
Jim Brady
Jun 04, 2022
Richard, Mary Jane and The Foreman Jose and the guys did a great job. So professional and friendly. The workmanship was top notch. We could not have had a better experience while replacing our windows. Highly recommended. Service: Vinyl window installation & replacement
Andy R.
May 28, 2022
Jeff and team did an amazing job replacing our windows and two sliding doors. Our job required some 'extra' effort, which included bringing in scaffolding and removing exterior stucco to allow for new construction installation. Jeff did a great job communicating expectations around material delivery, costs etc. The new windows look great. I highly recommend Alexander Company and their team.
Andrea Rosello
May 20, 2022
We had a wonderful experience. The team that came to replace the windows were polite, respectful and friendly. They took the time to clean up the area that they were working around. They also made sure that I was able to open/close the windows. I would recommend them to everybody that I know.
Oren Yunger
May 17, 2022
Very professional and reliable work by the Alexander Co team. Pleased with the quality of the windows and the installation process. Would recommend working with them for windows installation projects in the Bay Area Services: Window installation, Custom windows
A. C.
Apr 14, 2022
A somewhat belated review, but just wanted to comment on the great work that they did. I had to replace two windows in my home office room. They promptly sent out a rep to take a look and recommended the type of window that I needed. I also checked out the window at their showroom and decided to use them to replace the two windows after getting a cheaper quote from another vendor, but that vendor did not bother to come out because I had to replace at least 4 windows before they would come out. Installation was very fast and professional.

The crew (Numas and Jairo) was very careful in laying down coverings on all carpeted areas and even the desk and computers that are in my office. I am very satisfied with the workmanship and the quality of the window that was installed. While their prices may not be the cheapest, I think their quality of work and product are worth the price.
H. L.
Apr 09, 2022
I didn't choose Alexander Company for my windows-- my HOA listed them as the highly recommended installer since they do nail-in installation rather than retrofit, but I'm so glad that we decided on them. Installation was super clean (they taped up plastic walls immediately outside their work area so the dust was very contained) and the work was neat and beautiful.

They even asked me if I had extra flooring because the old sliding door was wider than the new slider and there was a tiny little gap so they were going to add more flooring. Ron ended up doing a special trip to Home Depot to find t-molding (and luckily found one that matched) to fill in the gap on the floor because it would look better. The care that everyone took (thank you Ron, Carlos, and Jose!) showed in the end result and one of the city inspectors was raving about Alexander Company, how they always do impeccable work. The best part is that I haven't needed to on my heater at all since getting my new windows!
B. K.
Apr 07, 2022
I would give 5 stars but for the delay from june to September to get the job done. I'm aware it could have been due to covid labor shortage and manufacturing delays. Once here though? The installers took two days. They were efficient, clean, meticulous and layed down paper to protect the hardwood floors. We ordered 6 windows and a sliding door, simonton vinyl beige. I was surprised how seamless the inside looked and happy about how the outside didn't have that wide ugly trim that is telltale of vinyl replacement. Bravo!
Appleladye L.
Apr 07, 2022
Walter and Mary Jane and their installation team did an awesome job. They provided a free onsite inspection, consultation in their showroom, offered a very reasonable pricing ($2700/to purchase and install two sliding large windows), permit filing and retrofitted two windows in 6hrs. I liked that they put plastic on the floors and over nearby furniture when they break the glass to prevent any damage and prepared the invoice/permit before they left.

We only asked they help reinstall the roller shades and pick up a frame that was left accidentally, and they arranged someone to address our issues right away. I'd prob just recommend the installers cover the window frame ledge since the wood/paint got scratched a bit but I would say that is very minor compared to other contractors I've seen that would do a poorer job. We could not be happier, thank you Alexander Company!
Rob S.
Feb 15, 2022
We wanted to replace most of the windows in our home and had received several recommendations from friends who had used the Alexander Company. We are so glad that we had listened to them. We had a great experience and are so happy with the final outcome Great customer service and fantastic employees. Did all the work as promised and then some. Maintained communication with us through the entire process.

They arrived at the times promised and completed the job as promised for a more than fair price. Great craftsmanship and they did an unbelievable job Will definitely call them again
Q. B.
Jan 30, 2022
We've had leaky problems for years. The fixes have only been temporary. We called Alexander company to give a quote to replace our deck door, which we were sure was the root of our problem. Walter looked at the door, jamb, etc, and assured us our problem wasn't the door. He could have lied and charged us for a brand new door and we wouldn't have questioned it. We can't tell you how much we appreciate me his honesty. I'd definitely recommend them. Thanks
Virginia C.
Jan 25, 2022
Such a wonderful & professional company! They were quick & responsive on EVERYTHING. They safely wore masks, covered up my furniture & prepared everything they needed in their own company truck. I struggled for months with my HOA about this window because not a lot of people were willing to work on my window because it couldn't be retrofitted. Alexander Company were not only willing but they also provided me a fair estmate as well. Definitely recommend & will go to again if I ever decide to replace my doors!
Ann C.
Jan 18, 2022
I replaced three slider windows and one large sliding glass door (old aluminum vrs) with Simonton Daylight Max (door was Madeira). These allowed a greater amount of light to enter my dark unit than did other brands. I ask lots of questions, and Rich (salesman) was ever patient in answering them, sometimes more than once. Also, the Alexander Co show room is more accessible (hours, flexibility) than many, a big plus.

The installation team (Gerry et al) was careful of my interior space and did high quality work, inside and out. They were efficient, but not rushed -- they arrived on time. A bonus was that Alejandro, the stucco expert, was available the next day after installation to re-stucco the space around the new door (exterior). One reason I contacted the Alexander Co for an estimate was because of their high ratings.

I concur. Everyone, including office staff Trish and Mary, was a pleasure to work with. Cost was very reasonable and end result is evident in attached photos. I have only one before-after, but see for yourself.
Razz M.
Jan 10, 2022
Our experience with Alexander Company was fantastic. We first met with Walter a couple of times at their showroom in Burlingame. He patiently answered our questions and guided us to the best window for our needs without overselling a more expensive brand. He came to our house a couple of times to look and measure the windows and make further suggestions based on our house.

The crew that came out to do the work (Jose, Reynaldo, Jerry and Roberto) were prompt, courteous, neat and cleaned up very well after themselves. Their work was meticulous and we are really happy with the windows we chose and they way they look. I would highly recommend them and suggest you visit their showroom and take a look. When we are ready to replace our patio doors we will definitely check with them first.
Alan H.
Dec 22, 2021
Great job getting the replacement window in before the holidays. Super fast and very neat and clean. I also like the way the window opens and closes. Alan H.
Smiley S.
Nov 18, 2021
They sent an un-vaccinated salesman to my house, who lied to me about it. When I informed the company that their salesperson was unvaccinated and had lied to me, they couldn't care less. Criminal.
Jim A.
Nov 10, 2021
Everything was done as promised. New windows are great. Area left spotless. Definitely recommend Alexander
Steve C.
Oct 19, 2021
We recently had 5 windows replaced in our home and the process was completely painless. Walter came out and took the measurements and discussed our options, and his team came out to do the installation. The guys that did the installation were very polite, cleaned up after themselves so that you wouldn't even have known they were there, and got the job done quickly.

There is definitely something to be said about having real pros in your home doing their work; they know what they are doing. The price was right in the range we were expecting to pay, too. We will definitely use them again when we need to replace windows in the future, and I happily recommend them.
Inge Tiegel Doherty
Oct 10, 2021
Needing some replacement windows, I was referred to Alexander Co by my General Contractor and longtime friend. I called for a appointment to get recommendations and can't say enough about the estimator and project manager, Walter. If you have a difficult or challenging project, make sure that you asked for him. His recommendations were spot-on and I should have an estimate back within a day. The best part about this company is that they not only sell the windows but they have an in-house installation crew and stand behind their work.
Todd L.
Sep 24, 2021
From start to finish, the process for our new door was easy, efficient, and well-done. We got a quick response when we asked for an estimate, and although we had to tweak the estimate a bit, we were quickly able get what we needed. There was a delay in getting the door manufactured due to COVID (not the fault of Alexander Company), but when the door was available, it was installed within a couple days of delivery. The installation process was fast and professional, and the final result was excellent. This is the company we will be using again for door replacements.
Ed S.
Sep 17, 2021
From getting the quote/estimate to installation, working with Alexander Company has been awesome. Great communication, timely responses, respectable about time. The prices are fair and the work is excellent. I highly recommend using them for all your window needs.
Jan B.
Sep 09, 2021
This was the best information, price and service that I received to replace 3 existing windows in my home. They were helpful, clean and neat. I priced around and found they were by far the fullest service, with the best range of products for the best price.
Setu A.
Aug 19, 2021
We ordered a complete replacement of our windows as they were more than 35 yrs old and were in bad shape. We got in touch with Jeff, the owner of Alexander company and it was a great experience with him. From taking the time to come by and do initial estimations and measurements to explaning the step by step process, to keeping us updated, to contract signing, getting permits and generally being proactive. it was all done so professionally that we would highly recommend Alexander company for all your installations. Thank you Jeff!
Marsha W.
Aug 12, 2021
I ordered a new entry door for my home. I tried one other company first, but they don't install their doors and I couldn't imagine trying to find someone to do it. So stopped by Alexander Co and spoke to Walter. I picked out a door, he came and measured and ordered it. Had to wait a bit for it to arrive, but it was installed two days ago and I love it.

Nice fit, no draft coming in and easy to open, close and lock/unlock. The deadbolt on my old door no longer lined up so wouldn't lock. This door was ordered "pre-hung" so it is a much better fit. The installers were great, they had some difficulty due to the age of my house (built in 1938) but got the job done and everything is perfect. They also did a good job leaning up.
Gina W.
Aug 11, 2021
I received a referral to Alexander Company. The owner came by and recommended four window replacements for the front of my home. He chose a style which would complement the architecture of my house. After the order arrived, his crew installed the windows and replaced previous damaged trim work- the trim was fabricated in my driveway and matched the existing trim in the room. The guys were professional and knowledgeable. No cleaned up needed on my part after they left. I would recommend this company. I truly received outstanding service.
Mike Borg
Jul 21, 2021
I have used Alexander Glass previously to install 9 Anderson windows in my home. They did a great job! Recently due to covid I ordered 3 of the same Anderson Windows directly from Home Depot to take advantage of their sale. Savings at HD was great and the windows were delivered directly to my house from Anderson! I waited 12 weeks! I then called Alexander Glass and left a message for John to call me.

I waited a week, no response. I then called again. The person answering the phone was all set to do an appt until I said I already had the windows. Lots and lots of stupid excuses why they now could not do the job. I said I have the windows and you could measure them to confirm fit. Answer is No! She said they would check with John, nothing back. My conclusion is that Alexander wants a big markup on the material to add to the job price!

It's sad, they are installers not manufactures and are General Contractors too! So they should be willing to at least price the job I was very surprised at the non helpful attitude by the phone staff, not at all what I was expecting.
Gene Bordegaray
Jun 30, 2021
This is the third time I've used Alexander Company. Obviously, since I'm a repeat customer, I'm very satisfied with the products available, the professional installations, and the personalized customer service. Alexander Company is very professional and at the same time very customer friendly. The products they offer are high quality and their installations are trouble-free. Their prices are fair and competitive. I will return to them for more installations.
Tom O'Connor
Jun 17, 2021
John and EVERYONE at Alexander Windows are Wonderful to deal with! They are prompt, thorough and knowledgeable. Alexander Windows made the whole process of purchasing and installing my windows so easy! I would HIGHLY recommend Alexander Windows for all of your window needs. Services: Window installation, Custom windows
Angeline Yeo
May 31, 2021
This is the second time I've used them for windows. They did an amazing job the first time and it was no different the second. Their consultant was very helpful, flexible and transparent. Worked with us to come up with various configurations and helped us think through various scenarios. The workers are fast and kept the job site clean and did quality work. We love our windows and sliding doors and would highly recommend them to anyone!
Aaron Rogers
May 26, 2021
Alexander Company installed new windows on our home. - There quote was reasonable. - They Clearly explained our window options and the installation method. - There workers were on time every day. They were clean and courteous. They protected all of our stuff. They cleaned all there construction debris, Even most the most minor dust and wood chips. - There work looked great. There excellent, there polished! We're so happy. Highly recommend them!
Melissa MelissaM
Apr 18, 2021
Jeff is extremely easy to work with and very professional. The crew of installers were equally as professional, courteous and tidy. They ensured a meticulous install of the windows in our 110 year old house (not everything is exactly plumb in our home!). The Marvin windows and door are exactly what we expected. Highly recommend! Services: Window installation, Door installation
Catherine West
Apr 16, 2021
This is my second time using Alexander Windows and they are great. Worth the wait on getting the exact window I needed and the installation is fast, efficient and reliable. I recommend them highly. Walter answered all my questions and was glad to talk to my construction company to be sure everyone was on the same page. Turned out great!
Bonnie L.
Apr 15, 2021
Alexander Company provided us with a stress free window replacement experience. Everything was explained well during the initial visit with Walter and the subsequent booking and installation was also easy on us homeowners. We got our preferred installation date, and the crew that arrived completed the replacement of four windows much more quickly than I'd anticipated, made sure everything worked to our satisfaction, and cleaned up the debris. We are very satisfied and highly recommend this company.
Robert Vaughan
Apr 06, 2021
We have used Alexander several times over the past 15+ years, most recently for our front door replacement. Once again, we were completely satisfied. Jeff makes it easy and keeps his schedule commitments. His installers are courteous and professional with superior attention to detail and cleanup. Service: General door installation
Meredith Nassihi
Feb 10, 2021
Alexander Company came out and replaced two French doors with sliding glass doors and did a terrific, and easy for me, job. The estimator was responsive and got me back several iterations of a quote until we had what we wanted, the installers were polite, covid responsible, and did an impeccable job. They handled everything related to permitting, including having the approval emailed to them which allowed them to schedule the plaster replacement as soon as the work was approved. Easy for me and great doors for my house, we couldn't be happier!
Anna C.
Jan 14, 2021
Alexander Company were contracted to do two bedroom windows in my house. I was impressed that they were safety conscious. The crew wore their facial masks. They covered and sealed the main areas of the house and the bedrooms. After completion of the job, the foreman demonstrated how to operate the window, and asked if I had any questions. Overall, they were clean, conscientious, and did an excellent job!
Oscar G.
Dec 25, 2020
Jeff, I went to a different company in San Francisco. Totally positive experience. My contractor picked up the windows, completed installation. I am totally pleased, and convinced your salesperson is FoS! You are welcome to come by and see my fantastic windows and re-understand how to sell windows.
Marina Hegstrom
Nov 03, 2020
Alexander Co replaced 11 windows in our home as well as new front doors and all new siding and trim (i.e a very large job). They were absolutely fantastic to work with and I would have no reservations recommending Alexander to our best of friends and family. The gentlemen that worked on our house were beyond professional and the quality of their work was outstanding. They took the time and energy to make sure that all of the work was done to the highest standards and our home turned out beyond our expectations.