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Alpha Windows & Siding Alpha Windows & Siding is a home improvement company that specializes in replacement windows, roofing and vinyl siding. The leader on Long Island and New York! Our design consultants will help you turn your home into a masterpiece with the right styles and colors for your replacement windows, vinyl siding, roof and doors.
Served areas
  • Suffolk County, Long Island, New York, Nassau County
Highlights and features
  • Siding Replacement
  • Replacement Windows
  • Siding
  • Windows
Services
To view Alpha's complete line of premium windows, siding and roofing, we invite you to visit our showroom. You will have an opportunity to examine Alpha's superb craftsmanship up-close and compare our features to those of our competitors. When you purchase Alpha products, be assured you are dealing with a single source through every phase of installation and service.
View a small collection of the homes that Alpha has transformed over the past few years. See the homes as they stood originally and see the beautifying transition they underwent. This gallery will help give you some ideas as to what you might be looking for in your next home remodeling project. Alpha performs thousands of projects each year.
Alpha's work goes well beyond the residential sector. Since Alpha is a direct source for building products, our team will help you throughout all phases of construction, from planning to installation. Contact Alpha Windows for a free in-home consultation on your next commercial window replacement project.
Alpha Windows are manufactured to exact standards. They can help reduce your heating and cooling costs forever. Plus, or installers are all trained professionals who will do the job exactly the way you want it done. The result? Great windows, expert installation, your total satisfaction. Alpha Tri-Lock Vinyl Siding can make your home look brand new.
Awning Windows feature a single sash that is hinged at the top and utilize a crank handle to open outward. They can be mulled on one continuous frame and are commonly used to complement windows above or below them. Popularly used for adding extra light and ventilation in to a room. Basement Windows feature a single hinged sash that utilize a latch to open inwards.
Reviews (31)
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Vanna Kanha
Apr 26, 2022
Alpha did an excellent job with my home's renovation project. From the crews that did my windows and siding to the rep who came over, we were well taken care. The new windows look great and the siding color was exactly what we wanted. The work was completed within the promised time frame, and we were happy with the whole process. Service: Window installation
Becca Capinoe
Apr 23, 2022
Alpha gave us a great price on swapping out the old windows and siding on our home, and they did excellent work coordinating the project. They arranged a date for the window installation, and afterwards arranged for the delivery of the rest of the materials plus installation. From start to finish, it took approximately twelves days to be completely finished. The crews were courteous and did quality work, and I would use Alpha again on our next project.
Kay Scharpf
Apr 22, 2022
I used Alpha recently to replace my windows throughout my house. The rep was courteous and did a good job presenting the window and discussing options for completing my window project. When the windows arrived, the office called me to arrange for installation, and the crew that completed my project was very professional. They did good quality work and the new windows are doing a great job so far.
Nicole Pacina
Apr 06, 2022
We contracted Alpha to install new siding and windows on our house before this spring, and they were able to fit us in and finish everything on time. Once the windows were ready, they called to schedule the install, and the crewmen did a good job. Immediately afterwards they installed the siding and cleaned everything up within a week. Our home looks great and I am very excited with the new look of the exterior of our home.
Judy Mejia
Mar 11, 2022
Alpha just replaced the windows, siding, gutters and back patio door on my home. The process was easy because Alpha was able to complete all installations back to back and finish within two weeks upon delivery of materials. The crews that worked on my house were pleasant, on time, and courteous. They managed everything with little disruption to me and they cleaned up well upon completion. My house looks fantastic and I am very happy with the way it came out.
Vicky Laurino
Feb 27, 2022
We used Alpha to replace some windows on our home along with the siding. Once the windows arrived, they scheduled an installation date that worked for us, and the crew showed up in the morning and was done by the afternoon. They cleaned up well, and then the next day, the siding crew started work on the rest of the house. The siding crew worked throughout the week to finish our house and they cleaned up well before leaving. Afterwards, the gutters were installed by another crew and the container removed. All in all, the process was simple and smooth, and my home came out great.
Sara Laskow
Feb 25, 2022
Alpha found the siding color we were looking for in order to replace the existing siding. Once the siding materials came in stock, they arranged for a crew to be at our home to begin work. Everything was delivered the day before and the crew was there the next day. The crew did great work and were completely finished in about eight days. Our house now looks brand new and we are very happy with the quality.
Haru Moonan
Feb 18, 2022
Alpha installed a couple of new windows for us and they replaced the siding on our home. We are very pleased with the quality of the siding and installation that was performed. Our house was completed in a timely fashion, and the installers cleaned up well upon finishing. The office arranged for the gutters to be completed and the container to be picked up immediately after. Overall simple, good and easy experience.
Bill Carmenn
Jan 23, 2022
I want to commend the installers at Alpha who worked on my home. They were courteous and professional, and they did quality work installing my windows. The windows are doing a good job insulating my bedroom. I am pleased with the craftsmanship that went into installing my windows as well. Service: Window installation
Sandra Zambrotta
Jan 06, 2022
I used Alpha to replace a few windows on my house and everything was completed to my satisfaction. The crew that installed my windows was professional and they did a good neat installation. The windows are making a big difference in insulation compared to before, and I will hopefully be doing the rest of my windows soon. So I am happy to have used them for my home's needs.
Denise Williams
Nov 29, 2021
I used Alpha Siding to revamp my home recently, and they really transformed the look of my house. The siding came out great and the workers worked hard to finish my home every night. All in all I know I received great value for the work and products, and I would gladly recommend Alpha to anyone looking to reside their home. Service: Window installation
Angela Javid
Nov 28, 2021
We replaced the siding and windows recently with Alpha and the whole process was smooth and straightforward. The rep who dealt with us was knowledgeable and attentive, the gentleman who measured and ordered everything was on point, and the installation crews were neat and receptive. Our house looks brand new and we're glad everything was finished so well.
Kevin Cabello
Nov 25, 2021
Alpha resided my house recently and they did good work overall. Once all the materials arrived, they scheduled the installation for me and they were done within a week. Several guys were at my house every morning and worked thoroughly throughout the week to finish. My house looks brand new compared to what it was so I am happy with the results.
Monica Kramer
Nov 14, 2021
Alpha re-sided the front of my home and the workers did a beautiful job. They finished up in a couple of days and already my home looks brand new. I will be using them in the spring to finish up the rest of my house. Everyone I dealt with was courteous and knowledgeable, and I hope to get the same workers. Service: Window installation
Jeanie Chiappa
Nov 06, 2021
We recently replaced the windows in our home with Alpha so that we can improve the energy efficiency of our home. The crew did an excellent job installing and cleaning, and they were finished before the evening. The process from start to finish was hassle-free and easy, and we're very happy with the product. Service: Window installation
Erica Lada
Oct 25, 2021
Alpha changed the siding on my house recently and they did a thorough job revamping the old look. The workers were here every morning and worked throughout the day to finish promptly and neatly. We went over a couple of things on the last day to finish everything, and they took their time to sweep up. I was very pleased with the overall work.
Sami Rohikan
Oct 17, 2021
Alpha replaced the siding and a few windows on my home recently and they did a fantastic job. I was very happy with the knowledgeable sales representative and with the workers who did the installation. They know their craft and they did a great job with everything. I would use everyone again if I need anymore work. Service: Window installation
Lynn Mituzi
Oct 15, 2021
Alpha provided us with good value and good quality windows and siding. The installers who performed the work did an excellent job, and the guys were knowledgeable. Overall good experience, just a small wait time for the windows to arrive, but manageable. We would use Alpha again. Service: Window installation
Sarah Kwan
Oct 02, 2021
I had Alpha change the siding and four windows on my house. I am very happy with the outcome of how my home came out, and was very happy with the professionalism of the workers. Bill stopped by and made any adjustments I requested, and they cleaned up before finishing. Overall process went very smooth and was easy for me. Service: Window installation
Florence Medolla
Sep 25, 2021
We are very happy with the work performed by the crews at Alpha. It was an easy process dealing with everyone since Bill came over and measured all of the materials needed for my home. When they had everything available, Bill scheduled my installation and the crews arrived to complete all of the work. They took care of my home and left it looking like a completely new house. I will recommend them to any of ny friends or neighbors that ask about my home.
Billy M.
May 08, 2020
I needed the siding replaced on my house. I contacted Alpha for an estimate. The older salesman Gary came to my house. He insisted my wife be home to pick a color. He wanted us to pick a color and sign that day. A big no in my book. I told him I was waiting for my tax return money and he insisted I finance through the company. Meanwhile, I knew I was going to get more estimates.

After he said that, he immediately got irritated and said the price would go up next time I contacted him. He got up and left right away. I instantly knew they weren't going to get the job with that attitude towards us. I ended up getting a better price from someone else. Bad service. Stay away.
Melissa Carltin
Dec 14, 2019
Everyone who worked on our project was a real professional and the crews were extremely attentive while they performed the work. They took extreme care in everything from start to finish, and the new windows and siding look great. Alpha took any hassle out of the process and provided prompt attention to any concerns. We're really excited about the new look of our home and have already received compliments from our neighbors. Thank you to all of the employees who helped make our home look brand new.
Frank K.
Jun 06, 2019
Alpha installed 12 windows 20 years ago. Could not close or lock this winter. Hired new company to replace. Found interior post and foundation damage. Windows leaked for twenty years unbeknownst to us. Now having to rebuild foundation and then replace windows. This pictures is a samples of damage. I would not recommend this compa
Maria Ferraris
Jan 24, 2019
I would like to thank everyone at Alpha Windows for their expertise and work on our home! From the initial consultation to the crew and everyone in between! We are very happy with the detail of work, clean up, and professionalism!
Sonia S.
Jan 24, 2017
We had our windows installed in 2009. At the time we were told that the windows had a lifetime guarantee (as long as it's the same owner). About 2 months ago the ledge to open the window fell off. We contacted them and thet told us they would take down our number and call us the next day. We called again, this time they told us to send them a picture.

We did. Two months later, we are still waiting for a reply. We haven't abused the product. However, even though we live in NJ we went with this company because of their lifetime guarantee. THEY ARE OBVIOSLY LIARS! THEY DON'T GUARANTEE THEIR WINDOWS! If you are planning to stay in your home and want new windows, go somewhere else to get them.
Claudio
Apr 08, 2015
Changed the front of house with vynil and it looks good. Men that did the work did great work. I am very happy with the new look. They came by two times and gave me good price. They cleaned everything well and did a great job.
Rose M.
Sep 08, 2014
DO NOT DO BUSINESS WITH THIS COMPANY! They offer a lifetime guarantee on their windows, which sounds great, except they close their business & open a new corporation with just a slightly different name so they won't have to honor their guarantee. They say they have been in business since 1967 but that was under a different but very similar name. Don't count on using the guarantee they give you.

They wouldn't honor it with me because the company I dealt with (one word different in their title) is out of business. I even verified that the man I spoke to was the man who sold me my windows & came out to re-install one window when his installer did a poor job of it the first time. What a scam!
Alexandra Taylor
Everyone from sales to finish at the company treated me like family. I was between three colors on the siding, and they took the time to accommodate me and work with me to find the color I wanted. The crew that did the work was extremely friendly and they took care of anything I asked for. Overall extremely satisfied.
Robin Wachoosky
Alpha did a great job on replacing the siding and windows on my cape. The windows were fully installed in one day, while the siding was completed in three days. The crews that worked on my home took diligent care of it and made sure I was happy. I was thoroughly satisfied with everyone I dealt with and the level of care shown to me.
Annie Vetrino
I am SUPER HAPPY with the courtesy and professionalism of the Alpha crew that transformed my home's exterior into a brand new home. The crew completed my home in less than a week and really left me with a worry free experience. From start to finish, everything was under control and I didn't have to worry about any steps in the process, Alpha took care of everything.
Russ Stein
Excellent work by the gentlemen who replaced the siding on my home. German and the rest of the crew were very accommodating and everyone who dealt with our project showed genuine care. Bill did a good job expediting the work and overseeing the progress of our home. Alpha is my recommended choice.