*The Angi rating for Glass Block Window Service companies in Merrifield, VA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Glass Block Window Service needs.
*The HomeAdvisor rating for Glass Block Window Service companies in Merrifield, VA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Glass Block Window Service needs.
Last update on April 24, 2025
Simply put - we believe that improving your home should be enjoyable. That is why we spent years designing our consultations, installations, and customer care experiences to minimize stress and provide every client with a fair and honest home improvement experience. Founded in 2005, Windows on Washington has become one of the area’s most respected home improvement companies because we make our clients' homes more beautiful, comfortable, and energy efficient. We are proud Angie’s Super Service Award winners, which we’ve now earned for seven consecutive years. We have an A+ rating with the Better Business Bureau and have never had one filed complaint. In addition, we have hundreds of positive customer reviews on Angie’s List, Customer Lobby, Home Advisor, Guild Quality, Houzz, and Yelp.
"We were very pleased with the work done by Windows On Washington for our insulation project. They were very friendly and did a great job of communicating with us throughout the project. The estimator Shayne was very helpful in providing us and explaining several options for our insulation needs. And the installation team did quality work with attention to detail. Brian, Anthony and Rubin were very willing to explain any details to us as they performed the work and went the extra mile to ensure we were happy with the end result. We recommend them highly"
Cristl P on April 2025
Simply put - we believe that improving your home should be enjoyable. That is why we spent years designing our consultations, installations, and customer care experiences to minimize stress and provide every client with a fair and honest home improvement experience. Founded in 2005, Windows on Washington has become one of the area’s most respected home improvement companies because we make our clients' homes more beautiful, comfortable, and energy efficient. We are proud Angie’s Super Service Award winners, which we’ve now earned for seven consecutive years. We have an A+ rating with the Better Business Bureau and have never had one filed complaint. In addition, we have hundreds of positive customer reviews on Angie’s List, Customer Lobby, Home Advisor, Guild Quality, Houzz, and Yelp.
"We were very pleased with the work done by Windows On Washington for our insulation project. They were very friendly and did a great job of communicating with us throughout the project. The estimator Shayne was very helpful in providing us and explaining several options for our insulation needs. And the installation team did quality work with attention to detail. Brian, Anthony and Rubin were very willing to explain any details to us as they performed the work and went the extra mile to ensure we were happy with the end result. We recommend them highly"
Cristl P on April 2025
Locally owned and operated. We are here to turn your project idea into reality. Additional phone number - (703) 830-6103.
"It was amazing. Before the work, it was amazing how little rain it would take to cause standing water in the yard. After they completed, we got 2" of rain in one day and had no standing water anywhere in the area they worked."
Carrie O on November 2020
Locally owned and operated. We are here to turn your project idea into reality. Additional phone number - (703) 830-6103.
"It was amazing. Before the work, it was amazing how little rain it would take to cause standing water in the yard. After they completed, we got 2" of rain in one day and had no standing water anywhere in the area they worked."
Carrie O on November 2020
Family Owned and Founded by a Firefighter, Tri County Windows and Siding has become Northern Virginia’s most trusted and valued Home Improvement Company for installations with over 25 years experience. We provide only the highest quality products available along with unmatched professional workmanship and customer service. Our estimate process is a no hassle approach, offering only the best possible pricing available upfront to every one of our customers and we feel so strongly about this that if another estimate is lower for the same products and services, we will match plus provide an additional 5%.... Guaranteed! Our mission is to provide and deliver the highest quality products on time, at a fair and reasonable price, by employing and supporting experienced professional sales, installation and customer service teams. We will continue to build our customer relationships by remaining true and honest with all our customers, vendors and employees. We take great pride in our past successes and will strive to be better every day!
"We replaced a very large French door opening to our backyard. The price quoted was well under the other quote we received from a well known replacement window company that advertises. The process was personal, communication was excellent throughout and the product is beautiful. I will absolutely use this company again if I need windows or doors."
Joellen W on July 2023
Family Owned and Founded by a Firefighter, Tri County Windows and Siding has become Northern Virginia’s most trusted and valued Home Improvement Company for installations with over 25 years experience. We provide only the highest quality products available along with unmatched professional workmanship and customer service. Our estimate process is a no hassle approach, offering only the best possible pricing available upfront to every one of our customers and we feel so strongly about this that if another estimate is lower for the same products and services, we will match plus provide an additional 5%.... Guaranteed! Our mission is to provide and deliver the highest quality products on time, at a fair and reasonable price, by employing and supporting experienced professional sales, installation and customer service teams. We will continue to build our customer relationships by remaining true and honest with all our customers, vendors and employees. We take great pride in our past successes and will strive to be better every day!
"We replaced a very large French door opening to our backyard. The price quoted was well under the other quote we received from a well known replacement window company that advertises. The process was personal, communication was excellent throughout and the product is beautiful. I will absolutely use this company again if I need windows or doors."
Joellen W on July 2023
We believe that our remodeling experts, who have been working in the field for more than 15 years, successfully completing over 10,000 homes, will provide the highest quality work for you. Century Siding Co., inc. is among the highest rated companies in quality and value in the Northern Virginia area. We also guarantee the highest quality products at the most competitive prices. We proudly carry products from Mastic, Alside, certainteed, James Hardie, Simonton and many more industry leaders. All of our technicians are carefully selected based on their level of skill and experience. They must go through vigorous training and must prove their abilities before they can actually begin work on a customers home.
"Century Siding has replaced several windows, as well as standard and patio doors for us. Their products are high quality and in each instance they provided stellar customer service and quality work, going over and above our expectations. They also clean up and have never damaged anything. I no longer get quotes from other companies because we trust this company 100%."
Pamela P on October 2023
We believe that our remodeling experts, who have been working in the field for more than 15 years, successfully completing over 10,000 homes, will provide the highest quality work for you. Century Siding Co., inc. is among the highest rated companies in quality and value in the Northern Virginia area. We also guarantee the highest quality products at the most competitive prices. We proudly carry products from Mastic, Alside, certainteed, James Hardie, Simonton and many more industry leaders. All of our technicians are carefully selected based on their level of skill and experience. They must go through vigorous training and must prove their abilities before they can actually begin work on a customers home.
"Century Siding has replaced several windows, as well as standard and patio doors for us. Their products are high quality and in each instance they provided stellar customer service and quality work, going over and above our expectations. They also clean up and have never damaged anything. I no longer get quotes from other companies because we trust this company 100%."
Pamela P on October 2023
Start with skylights! At VELUX, our mission is clear: we're dedicated to transforming your space with natural light and fresh air with skylights. Whether you're looking to replace old skylights or install brand-new ones, we will guide you every step of the way. Why Choose VELUX? =================== When it comes to skylights and roof windows, VELUX is the global leader. Here's why you should trust us to transform your home: 1. Innovation and Quality: VELUX skylights are renowned for their innovation and unmatched quality. They're designed to let in abundant natural light while keeping your space leak-free and energy-efficient. 2. Huge Product Selection: You’ll have access to a wide range of skylight options, from fixed to vented skylights. And we are here to help tailor the selection to suit your specific needs and style preferences. 3. Expertise: We take pride in what we do at VELUX, and our team is highly trained to guide you through the entire process. From selecting the perfect product for your space to providing valuable recommendations, we're committed to making sure your skylight project is a complete success. 4. Professional Installation Partners: We don't stop at product selection and recommendations; we also match you with a VELUX-trained installer who will handle the installation of your skylights with precision and expertise.
Start with skylights! At VELUX, our mission is clear: we're dedicated to transforming your space with natural light and fresh air with skylights. Whether you're looking to replace old skylights or install brand-new ones, we will guide you every step of the way. Why Choose VELUX? =================== When it comes to skylights and roof windows, VELUX is the global leader. Here's why you should trust us to transform your home: 1. Innovation and Quality: VELUX skylights are renowned for their innovation and unmatched quality. They're designed to let in abundant natural light while keeping your space leak-free and energy-efficient. 2. Huge Product Selection: You’ll have access to a wide range of skylight options, from fixed to vented skylights. And we are here to help tailor the selection to suit your specific needs and style preferences. 3. Expertise: We take pride in what we do at VELUX, and our team is highly trained to guide you through the entire process. From selecting the perfect product for your space to providing valuable recommendations, we're committed to making sure your skylight project is a complete success. 4. Professional Installation Partners: We don't stop at product selection and recommendations; we also match you with a VELUX-trained installer who will handle the installation of your skylights with precision and expertise.
At Window Nation, we know replacement windows. We’re third-generation window replacement experts who have been lucky to provide homeowners replacement windows, siding, and doors for over fifteen years. We opened our first showroom in Maryland in 2006, quickly growing to serve homeowners in cities across the country – and we’re not stopping there. We’re grateful for every homeowner who has trusted us to upgrade their most important asset: their home. We’ve learned a lot about home improvement over the years, but the most important thing we learned isn’t about window replacement. We learned the home improvement industry isn’t about offering the best windows, siding and doors; it’s about the relationships we build with our customers.
"We hire Window Nation to replace 10 windows at our house, after a few months one of the panel leaked and was defective. Window Nation replace the panel at no cost under their warranty. We are very satisfy with the process and would hire them again to replace the remaining windows at our house."
Michael P on February 2020
At Window Nation, we know replacement windows. We’re third-generation window replacement experts who have been lucky to provide homeowners replacement windows, siding, and doors for over fifteen years. We opened our first showroom in Maryland in 2006, quickly growing to serve homeowners in cities across the country – and we’re not stopping there. We’re grateful for every homeowner who has trusted us to upgrade their most important asset: their home. We’ve learned a lot about home improvement over the years, but the most important thing we learned isn’t about window replacement. We learned the home improvement industry isn’t about offering the best windows, siding and doors; it’s about the relationships we build with our customers.
"We hire Window Nation to replace 10 windows at our house, after a few months one of the panel leaked and was defective. Window Nation replace the panel at no cost under their warranty. We are very satisfy with the process and would hire them again to replace the remaining windows at our house."
Michael P on February 2020
Since 1987 UNICORP Home Energy Services has made window, siding and roofing projects a worry free experience for over 23,000 homeowners in MD, VA and Washington D.C. We are proud of our flawless record with the Better Business Bureau because customer satisfaction is our number one priority. Our past partnerships with Price Club (Costco) and more recently Pepco Energy Services are a clear indication that we understand the importance of providing substantial savings and value on all our energy saving products. ---- At UNICORP we don't believe in hard-sell tactics, and never make cold calls that interrupt you at meal time. We understand the importance of making the right decision without headache or high pressure. That's why more customers refer us to their friends and family than any other window and siding company. Not surprising when dealing with professionals that care about their customers and love what they do. ---- We thank you for visiting our profile and look forward to improving the quality, enjoyment and energy efficiency of your home. ---- Additional phone - (703) 462-6100. Additional fax - (877) 867-3726. Award winning. Additional DBA - Vinyl Technologies Energy Service. Additional contact name- Brian Weil. Additional email - contact@unicorpmail.com.
"We hired Unicorp to change front door because of superb review on Angi, but disappointed. 1. It's a small company using subcontractors to do its work; Contrary to its claim, those subcontractors DO NOT work exclusively for Unicorp. 2. After subcontractors got paid, you will not see them again for the job. The service team seems only one person (JR). It is hard to make an appt, since he has to supervise a lot of subcontractors' work, and only do service when he is supervising near you. Specific problems: -Ghost swing after installation (i.e. door swings to close by itself). Had to request adjustment at least twice. -Fainted finish after a few years while still in warranty, but we were advised to paint ourselves. -Very thin layer of finish, and very easy to get scratch to show white underline color; -Have PROBLEM to LOCK the door. After it was "fixed", problem showed again. -Subcontractor used wood with black stains, suspect mold, to install the door; Brand new door had minor defect."
Christine c on March 2025
Since 1987 UNICORP Home Energy Services has made window, siding and roofing projects a worry free experience for over 23,000 homeowners in MD, VA and Washington D.C. We are proud of our flawless record with the Better Business Bureau because customer satisfaction is our number one priority. Our past partnerships with Price Club (Costco) and more recently Pepco Energy Services are a clear indication that we understand the importance of providing substantial savings and value on all our energy saving products. ---- At UNICORP we don't believe in hard-sell tactics, and never make cold calls that interrupt you at meal time. We understand the importance of making the right decision without headache or high pressure. That's why more customers refer us to their friends and family than any other window and siding company. Not surprising when dealing with professionals that care about their customers and love what they do. ---- We thank you for visiting our profile and look forward to improving the quality, enjoyment and energy efficiency of your home. ---- Additional phone - (703) 462-6100. Additional fax - (877) 867-3726. Award winning. Additional DBA - Vinyl Technologies Energy Service. Additional contact name- Brian Weil. Additional email - contact@unicorpmail.com.
"We hired Unicorp to change front door because of superb review on Angi, but disappointed. 1. It's a small company using subcontractors to do its work; Contrary to its claim, those subcontractors DO NOT work exclusively for Unicorp. 2. After subcontractors got paid, you will not see them again for the job. The service team seems only one person (JR). It is hard to make an appt, since he has to supervise a lot of subcontractors' work, and only do service when he is supervising near you. Specific problems: -Ghost swing after installation (i.e. door swings to close by itself). Had to request adjustment at least twice. -Fainted finish after a few years while still in warranty, but we were advised to paint ourselves. -Very thin layer of finish, and very easy to get scratch to show white underline color; -Have PROBLEM to LOCK the door. After it was "fixed", problem showed again. -Subcontractor used wood with black stains, suspect mold, to install the door; Brand new door had minor defect."
Christine c on March 2025
Paramount Builders takes pride in being your local home improvement contractor. Since 1991, we have served our local community by providing the very best products, warranties, installation techniques, service, and most importantly; your experience from start to finish. Our exclusive product lines give us the benefit of being able to extend our top-of-the-line products to you, our neighbors, with certainty and affordability. We hand-picked our exclusive products with you, your family, and your home's aesthetic and longevity in mind. All of our products were created to keep your home energy efficient and protected in every way. Our commitment to excellence does not waiver. We understand what it means to own a home, and we understand as professionals what you and your home deserve. We live each day by our mission statement; "Improving the Community, One Home at a Time," and thank you for continuing to trust us!
"Unprofessional visit. Showed up unannounced and we only knew they were there because one person stood 10 feet from our porch staring at us in through our living room window. My wife spent 10 minutes talking to them, they stated they had no business cards, they only had an appointment card but didn't present it. Honestly when you show up at someone's house you need some sort of identifier if your walking door to door in casual clothes. After the uncomfortable dead stare through the windows my wife and i have decided to post a No Solicitors sign. They didn't take no for an answer at first, pushing with more questions to circumvent the no she gave, as well as interrupted our dinner, as they showed up right at 6pm."
Robert H on May 2023
Paramount Builders takes pride in being your local home improvement contractor. Since 1991, we have served our local community by providing the very best products, warranties, installation techniques, service, and most importantly; your experience from start to finish. Our exclusive product lines give us the benefit of being able to extend our top-of-the-line products to you, our neighbors, with certainty and affordability. We hand-picked our exclusive products with you, your family, and your home's aesthetic and longevity in mind. All of our products were created to keep your home energy efficient and protected in every way. Our commitment to excellence does not waiver. We understand what it means to own a home, and we understand as professionals what you and your home deserve. We live each day by our mission statement; "Improving the Community, One Home at a Time," and thank you for continuing to trust us!
"Unprofessional visit. Showed up unannounced and we only knew they were there because one person stood 10 feet from our porch staring at us in through our living room window. My wife spent 10 minutes talking to them, they stated they had no business cards, they only had an appointment card but didn't present it. Honestly when you show up at someone's house you need some sort of identifier if your walking door to door in casual clothes. After the uncomfortable dead stare through the windows my wife and i have decided to post a No Solicitors sign. They didn't take no for an answer at first, pushing with more questions to circumvent the no she gave, as well as interrupted our dinner, as they showed up right at 6pm."
Robert H on May 2023
Licensed in MD, DC and VA, Presidential Exteriors is your one stop solution for any exterior remodeling needs. Our award winning products and experienced installers will ensure that your home is a Presidential Home. We look forward to showing you how our customer centric approach and commitment to communication guarantees satisfaction the first time, every time.
"Our review is based on the purchase (part 1) for replacing siding for both side of our home. Jacob L. was very professional, on time, and honest. He knows what he is selling. We learned a lot about our home during his presentation. Before we bought our home we paid for a professional home inspection. We thought our house inspector was very good but he did miss something---the siding on the sides of our home was installed extremely bad. Jacob pointed out so much that we just didn't know and should have be caught during our home inpection. Thanks Jacob!!"
Mearen B on March 2025
Licensed in MD, DC and VA, Presidential Exteriors is your one stop solution for any exterior remodeling needs. Our award winning products and experienced installers will ensure that your home is a Presidential Home. We look forward to showing you how our customer centric approach and commitment to communication guarantees satisfaction the first time, every time.
"Our review is based on the purchase (part 1) for replacing siding for both side of our home. Jacob L. was very professional, on time, and honest. He knows what he is selling. We learned a lot about our home during his presentation. Before we bought our home we paid for a professional home inspection. We thought our house inspector was very good but he did miss something---the siding on the sides of our home was installed extremely bad. Jacob pointed out so much that we just didn't know and should have be caught during our home inpection. Thanks Jacob!!"
Mearen B on March 2025
Marshall Roofing, Siding & Windows is a top roofing, siding, windows, and gutters company based in Northern Virginia. Throughout the years providing the highest level of customer service and 100% homeowner satisfaction has been the pinnacle principle at Marshall Roofing Siding & Windows. The belief that each and every homeowner deserves to receive good value for their money is the driving concept on the functions of the company. **Popular Returning Spring Promotion Coming Soon** (Inquire for additional details)
"It was time to replace my roof and I requested several estimates from roofing companies. I selected Marshall Roofing Siding and Windows. It was not the cheapest estimate but the estimate assessment by Mr. Chris Butler, of Marshall Roofing, was the most thorough. Mr. Butler inspected the roof, went into the attic (and found a bathroom vent venting into the attic instead of outside), went into my screened in porch to determine what kind of nails to use so that they would not come through the tongue and groove ceiling and he noticed some old satellite dishes that could be removed. Marshall roofing updated the proposal several times with all of my concerns and additions. This is great customer service! When it came to choosing a shingle color, we struggled to find the right color. Mr. Butler kindly offered to bring out additional shingle samples to us on a Friday afternoon. Again, above and beyond customer service. Mr. Butler also worked with us to find and install an attic fan specifically designed to be quiet when running. The job started promptly on time and was finished in two days. Mr. Butler came out as the job was wrapping up and when the crew finished packing up, on his own, he did a second magnetic sweep around my house to find any nails that may have been missed during the magnetic sweep performed by the crew. Again, great customer service! We are very happy with the workmanship and customer service that we received from Marshall Roofing and would highly recommend their services!!"
David T on April 2023
Marshall Roofing, Siding & Windows is a top roofing, siding, windows, and gutters company based in Northern Virginia. Throughout the years providing the highest level of customer service and 100% homeowner satisfaction has been the pinnacle principle at Marshall Roofing Siding & Windows. The belief that each and every homeowner deserves to receive good value for their money is the driving concept on the functions of the company. **Popular Returning Spring Promotion Coming Soon** (Inquire for additional details)
"It was time to replace my roof and I requested several estimates from roofing companies. I selected Marshall Roofing Siding and Windows. It was not the cheapest estimate but the estimate assessment by Mr. Chris Butler, of Marshall Roofing, was the most thorough. Mr. Butler inspected the roof, went into the attic (and found a bathroom vent venting into the attic instead of outside), went into my screened in porch to determine what kind of nails to use so that they would not come through the tongue and groove ceiling and he noticed some old satellite dishes that could be removed. Marshall roofing updated the proposal several times with all of my concerns and additions. This is great customer service! When it came to choosing a shingle color, we struggled to find the right color. Mr. Butler kindly offered to bring out additional shingle samples to us on a Friday afternoon. Again, above and beyond customer service. Mr. Butler also worked with us to find and install an attic fan specifically designed to be quiet when running. The job started promptly on time and was finished in two days. Mr. Butler came out as the job was wrapping up and when the crew finished packing up, on his own, he did a second magnetic sweep around my house to find any nails that may have been missed during the magnetic sweep performed by the crew. Again, great customer service! We are very happy with the workmanship and customer service that we received from Marshall Roofing and would highly recommend their services!!"
David T on April 2023
If you have a problem with your window, such as broken glass, minor leaks, or a problem with your window being stuck, repairing the broken part might be a cheaper option than replacing the entire window. However, if you have a deteriorating window frame or major leaks, buying a new window will be the better long-term solution.
Installing glass block windows has benefits and disadvantages, as with most materials. The pros and cons can vary depending on the type of glass block and the window location.
Pros
Maintains privacy while letting light into the bathroom
Energy efficient
Sealed to prevent drafts
Aesthetically pleasing
Strong and secure
Cons
Costly to install
Challenging installation
Challenging repair
Window replacement costs between $180 and $410 per window, or an average of $280 per window. However, your specific replacement job could cost as little as $100 or as much as $750. Factors such as frame material, the number of windows you need, and the type of glass you order all impact the overall cost. For example, simple double-glazed windows will cost $3 to $6 per square foot, but the stronger tempered glass ranges from $12 to $14 per square foot.
Glass block installation can be relatively expensive due to the range of material costs and the labor time to assemble this type of specialty window. The process proceeds slowly as the glass does not absorb moisture from mortar and silicone caulk takes longer to harden, leaving spacers to hold up the structure until the caulk or mortar begins to cure. Plus, if your current windows have structural issues or damage, you’ll need to repair them before beginning the project, increasing your bottom line.
The average cost to install glass block windows is about $710, ranging from $460 to $1,000, depending on the size and design of the window, installation type, and location. Different styles of glass blocks also impact the cost:
Clear glass blocks: $10–$30 per block
Colored glass blocks: $25–$40 per block
Acrylic glass blocks: $15–$25 per block
Wavy glass blocks: $10–$30 per block
Alpha glass blocks: $15–$25 per block
Ice glass blocks: $20–$35 per block
Diamond glass blocks: $20–$75 per block
Frosted glass blocks: $30–$35 per block