Well, they arrived at the time they specified and prepared to begin when a problem was discovered. I have three windows had well covers over them and they were screwed down and after fifteen minutes of looking they could not find the right nut for the screws. It was an honest mistake in...

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There are 4 highly-rated local glass block installation pros.
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TRUSTED BY FREDERICK, MD HOMEOWNERS
4.4
Average homeowner rating566
Verified glass block window services reviews
Verified Reviews for Glass Block Window Service pros in Frederick, MD
Last update on October 10, 2025
- William C.
- Joshua S.
My experience with Del-Ray Glass was positive from the beginning. They followed through on their promises to send a quote within 2 days after giving a free estimate on the glass-repair, they showed up early to the appointment to fix the window, and they worked hard until the job was done (and...
- Elizabeth P.
We had two windows in our home with broken sash cords and a number of windows that did not open and close easily or were sealed shut. Najim came over the same day I called and get every single window working properly. He also replaced two panes of glass that had cracks in them. The work...
- Anne S.
Richard Grunes came out, made measurements. He came back with only 3 pieces of glass. They did not have the walls, or base, or complete shower. Previously, home depot told me all of the pieces would cost less than $400--$400 for the entire shower, 3 glass panels, walls and base. Grunes was...
- Jim J.
I contacted MT AIRY GLASS AND DOOR when our development's landscape company shot a rock from one of their seated mowers into my sliding glass door. Jim Queen came by the same day I called him as he happens to live near my home. He helped us stabalize the glass so it wouldn't shatter all over...
- Matt D.
Greg Kolega, the owner, came out to our house, measured each window and made recommendations/options for each of our windows. We had two office windows, three MBR windows and a window above a tub all measured for plantation shutters and then had a downstairs office doors fitted for shades....
- Laura T.
Dr. Glass is a wonderful company. Very professional and courteous. Dwight called back immediately, drove by to see the property, gave a thorough estimate before beginning, and provided excellent workmanship and care of the property.
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Clifton Contracting
Clifton Contracting
Locally owned and operated. We are here to turn your project idea into reality. Additional phone number - (703) 830-6103.
"Kenny and team were amazing to work with - professional, polite, honest, and finished the project ahead of schedule and at a very fair price. We had two old single pane windows replaced in our basement (which may have been 50+ years old), and a new window well installed. The work was very well done. I have since recommended Clifton to multiple friends and other contractors. Five stars."
Alex W on September 2025
Locally owned and operated. We are here to turn your project idea into reality. Additional phone number - (703) 830-6103.
"Kenny and team were amazing to work with - professional, polite, honest, and finished the project ahead of schedule and at a very fair price. We had two old single pane windows replaced in our basement (which may have been 50+ years old), and a new window well installed. The work was very well done. I have since recommended Clifton to multiple friends and other contractors. Five stars."
Alex W on September 2025

Paramount Builders Inc
Paramount Builders Inc
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

Zen Windows of Washington DC
Zen Windows of Washington DC
At Zen Windows, we think that finding replacement windows, sliding doors and entry doors for your home should be a simple, pleasant experience. Our team works closely with you via e-mail and phone to help shape the improvements you envision without ever having a salesperson visit your home. We offer award-winning, energy-efficient windows and doors, and provide a lifetime transferable product and installation warranty. Zen Windows sets our clients at ease with our No Down Payment Policy. You won't pay a penny until the job is completed. Simple, easy, stress-free...the way it should be.
"Our builder grade 1990s wood windows, door, transom and site-lite windows had all suffered from age and neglected painting. They were all long overdue for replacement and then we discovered Zen Windows of Washington, DC. They are consummate professionals. Their high quality, energy efficient products backed by a transferable lifetime warranty, strong technical knowledge, excellent value (price/quality relationship), pressure free consultative sales approach, and absolutely incredible install team left us 100% satisfied from beginning to end. The leader of the install team promised us that they would do the install as if it was his own home and actually did! I am very detail oriented and given the complexity of the job, their work was truly unbelievable. It’s perfect! Don’t waste your time with Andersen, Pella, Thompson Creek or others. Look no further than Zen Windows of Washington DC and work together with them to find the best solution for you. You will be very happy you did."
Devon S on June 2025
At Zen Windows, we think that finding replacement windows, sliding doors and entry doors for your home should be a simple, pleasant experience. Our team works closely with you via e-mail and phone to help shape the improvements you envision without ever having a salesperson visit your home. We offer award-winning, energy-efficient windows and doors, and provide a lifetime transferable product and installation warranty. Zen Windows sets our clients at ease with our No Down Payment Policy. You won't pay a penny until the job is completed. Simple, easy, stress-free...the way it should be.
"Our builder grade 1990s wood windows, door, transom and site-lite windows had all suffered from age and neglected painting. They were all long overdue for replacement and then we discovered Zen Windows of Washington, DC. They are consummate professionals. Their high quality, energy efficient products backed by a transferable lifetime warranty, strong technical knowledge, excellent value (price/quality relationship), pressure free consultative sales approach, and absolutely incredible install team left us 100% satisfied from beginning to end. The leader of the install team promised us that they would do the install as if it was his own home and actually did! I am very detail oriented and given the complexity of the job, their work was truly unbelievable. It’s perfect! Don’t waste your time with Andersen, Pella, Thompson Creek or others. Look no further than Zen Windows of Washington DC and work together with them to find the best solution for you. You will be very happy you did."
Devon S on June 2025

Power Home Remodeling
Power Home Remodeling
As the nation’s largest full-service exterior home remodeler, we are backed by over 1,000+ Angi Super Service awards and more than one million happy customers. Why? Because we treat each job as an audition. An opportunity to prove ourselves to you. And the results speak for themselves. So make your home all it was meant to be with our unrivaled exterior services. Contact us today for a free, no obligation estimate on replacement windows, roofing, siding, doors, or attic insulation.
"Power Home Remodeling has been fantastic. We had them come out to replace our gutters and were very impressed with the quality of their work. The crew that did the job kept everything clean and organized; you wouldn’t have known they had been there, which is uncommon for many companies. We were so impressed that we are now moving forward with replacing our siding. Everyone at Power Home Remodeling has been incredibly helpful throughout this process, and we couldn’t be happier. We will work with them on future home projects."
Jonathan R on June 2025
As the nation’s largest full-service exterior home remodeler, we are backed by over 1,000+ Angi Super Service awards and more than one million happy customers. Why? Because we treat each job as an audition. An opportunity to prove ourselves to you. And the results speak for themselves. So make your home all it was meant to be with our unrivaled exterior services. Contact us today for a free, no obligation estimate on replacement windows, roofing, siding, doors, or attic insulation.
"Power Home Remodeling has been fantastic. We had them come out to replace our gutters and were very impressed with the quality of their work. The crew that did the job kept everything clean and organized; you wouldn’t have known they had been there, which is uncommon for many companies. We were so impressed that we are now moving forward with replacing our siding. Everyone at Power Home Remodeling has been incredibly helpful throughout this process, and we couldn’t be happier. We will work with them on future home projects."
Jonathan R on June 2025

Exquisite Roofing & Exteriors, LLC
Exquisite Roofing & Exteriors, LLC
Exquisite Roofing and Exteriors LLC is a family owned and operated business that's fully committed to serving the residential roofing, windows, and other interior/exterior home improvement needs of our clients. We pride ourselves on quality and professionalism. In addition to residential and commercial roofing services, we also specialize in providing a broad range of services including window replacements, storm damage repair, metal roofing, custom deck design, replacement of doors, gutter replacement services, and more! We are CertainTeed preferred contractors and GAF certified! We are fully licensed and certified to operate with your insurance! and Yes we do provide FREE No-Obligation Estimates! ALL ESTIMATES ARE GOOD FOR 90 days Give us a call, message, or email! [email protected] Office manager phone: (443)734-7152 We also have the app so message us too if that is more convenient for you!
"No show for an in-person estimate after I spoke with someone on the phone."
Peter R on June 2024
Exquisite Roofing and Exteriors LLC is a family owned and operated business that's fully committed to serving the residential roofing, windows, and other interior/exterior home improvement needs of our clients. We pride ourselves on quality and professionalism. In addition to residential and commercial roofing services, we also specialize in providing a broad range of services including window replacements, storm damage repair, metal roofing, custom deck design, replacement of doors, gutter replacement services, and more! We are CertainTeed preferred contractors and GAF certified! We are fully licensed and certified to operate with your insurance! and Yes we do provide FREE No-Obligation Estimates! ALL ESTIMATES ARE GOOD FOR 90 days Give us a call, message, or email! [email protected] Office manager phone: (443)734-7152 We also have the app so message us too if that is more convenient for you!
"No show for an in-person estimate after I spoke with someone on the phone."
Peter R on June 2024
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Peak Custom Remodeling Corporation
Peak Custom Remodeling Corporation
We are the only company in Maryland offering the “Forever Guarantee” - A guarantee of our workmanship for as long as both you AND the next owner own the home. Unlike other companies we don’t just TELL you something will look good - we SHOW you. We provide full color 3-D renderings of all of our products to show what they will look like on your home PRIOR to you making any decisions or signing a contract. We do this for free the first time we come out as part of our free estimate & design consultation. If you decide to move forward, you don’t have to pay a single dollar until the job is complete and you are satisfied. With the Forever Guarantee, full color 3-D designs before you make a decision, and no payments until the job is complete - our goal is COMPLETE peace of mind for all our customers. We then follow this up with top notch communication, customer service, skill, and quality for Maryland’s leading exterior replacement experience.
"Great work"
Max D on August 2025
We are the only company in Maryland offering the “Forever Guarantee” - A guarantee of our workmanship for as long as both you AND the next owner own the home. Unlike other companies we don’t just TELL you something will look good - we SHOW you. We provide full color 3-D renderings of all of our products to show what they will look like on your home PRIOR to you making any decisions or signing a contract. We do this for free the first time we come out as part of our free estimate & design consultation. If you decide to move forward, you don’t have to pay a single dollar until the job is complete and you are satisfied. With the Forever Guarantee, full color 3-D designs before you make a decision, and no payments until the job is complete - our goal is COMPLETE peace of mind for all our customers. We then follow this up with top notch communication, customer service, skill, and quality for Maryland’s leading exterior replacement experience.
"Great work"
Max D on August 2025
American Windows & Siding
American Windows & Siding
American Windows & Siding of VA, Inc., specializes in custom windows, siding, doors, and roof systems. We use the finest quality products and labor available, and all our work is guaranteed for your peace of mind. Owner operated and employee owned, the company was established in 1991. We have two locations for your convenience - one in Fairfax, Virginia and one in Kensington, Maryland. We’ve been a member of the Better Business Bureau since 1993, and our customer service and proven track record of thousands of satisfied customers have earned us the reputation of an industry leader. All our workers are licensed, bonded, and insured. We have been top rated for the last eleven years in Washington Checkbook Magazine, a leading consumer publication for the DC metro area. In March of 2011 we were recognized as one of the "The Top 200 Remodelers" by Washingtonian Magazine and we have an "A" rating on Angie's List, receiving their Super Service Award for the past two years. With more than 13,000 jobs successfully completed in Northern Virginia, DC and suburban Maryland, we are proud of our reputation. Take a look at what our customers have to say. LICENSE # 49774.
"Had windows and doors installed by this company. The window installation went great. The bad news is that they do not seem competent at installing door hardware. My door has not latched properly since they made some unwanted modifications to the hardware (it worked perfectly before they started modifying it).have had them out three separate times to fix the issue they caused with the door latch and lock. Every “fix” they do seems to make the problem worse. I would steer clear of this company for door installations."
Christian S on April 2025
American Windows & Siding of VA, Inc., specializes in custom windows, siding, doors, and roof systems. We use the finest quality products and labor available, and all our work is guaranteed for your peace of mind. Owner operated and employee owned, the company was established in 1991. We have two locations for your convenience - one in Fairfax, Virginia and one in Kensington, Maryland. We’ve been a member of the Better Business Bureau since 1993, and our customer service and proven track record of thousands of satisfied customers have earned us the reputation of an industry leader. All our workers are licensed, bonded, and insured. We have been top rated for the last eleven years in Washington Checkbook Magazine, a leading consumer publication for the DC metro area. In March of 2011 we were recognized as one of the "The Top 200 Remodelers" by Washingtonian Magazine and we have an "A" rating on Angie's List, receiving their Super Service Award for the past two years. With more than 13,000 jobs successfully completed in Northern Virginia, DC and suburban Maryland, we are proud of our reputation. Take a look at what our customers have to say. LICENSE # 49774.
"Had windows and doors installed by this company. The window installation went great. The bad news is that they do not seem competent at installing door hardware. My door has not latched properly since they made some unwanted modifications to the hardware (it worked perfectly before they started modifying it).have had them out three separate times to fix the issue they caused with the door latch and lock. Every “fix” they do seems to make the problem worse. I would steer clear of this company for door installations."
Christian S on April 2025

Aspen Home Improvements
Aspen Home Improvements
Looking for a family-owned company with quality products and lifetime warranties? You have found us here at Aspen Home Improvements. Contact us today for information on window replacement!
"I am still waiting for the return of my deposit as it has been a week since I put this review on hold after putting in the notice that day 24 June of cancellation by email and next day mail. As I have said before I am a disabled Vet, Senior citizen with health problems. I have copies of the emails that I sent on the days of 06/24/2023 and by next day Mail on the 27th notarized copies of the cancellation. Tried calling but went to voice mail. No work has been done so a rating cannot be done on the work, only the price. This job was way overpriced and never got the chance to compare. The salesman was a good person but I have my family doing it for thousands less."
Daniel S on July 2023
Looking for a family-owned company with quality products and lifetime warranties? You have found us here at Aspen Home Improvements. Contact us today for information on window replacement!
"I am still waiting for the return of my deposit as it has been a week since I put this review on hold after putting in the notice that day 24 June of cancellation by email and next day mail. As I have said before I am a disabled Vet, Senior citizen with health problems. I have copies of the emails that I sent on the days of 06/24/2023 and by next day Mail on the 27th notarized copies of the cancellation. Tried calling but went to voice mail. No work has been done so a rating cannot be done on the work, only the price. This job was way overpriced and never got the chance to compare. The salesman was a good person but I have my family doing it for thousands less."
Daniel S on July 2023

Roofing Pups, Roofing & Siding
Roofing Pups, Roofing & Siding
Since 1992, Roofing Pups, Roofing & Siding - has provided homeowners and business owners with top quality, factory-direct products, professionally installed by licensed, bonded installers with over 25 years of home improvement experience. Our experience sales representative will assist you with the windows and/or doors that suit you best. Roofing Pups Roofing & Siding takes pride in building relationships with not only our consumers but with our manufacturers as well. We have maintained a reputable business relationship with both of our leading manufactures, American Jewel and Home Guard, for 15 years. Being a locally owned and operated company, Roofing Pups is able to provide you with top quality products with a bottom line price!
"Great.good job"
Linwood C on May 2025
Since 1992, Roofing Pups, Roofing & Siding - has provided homeowners and business owners with top quality, factory-direct products, professionally installed by licensed, bonded installers with over 25 years of home improvement experience. Our experience sales representative will assist you with the windows and/or doors that suit you best. Roofing Pups Roofing & Siding takes pride in building relationships with not only our consumers but with our manufacturers as well. We have maintained a reputable business relationship with both of our leading manufactures, American Jewel and Home Guard, for 15 years. Being a locally owned and operated company, Roofing Pups is able to provide you with top quality products with a bottom line price!
"Great.good job"
Linwood C on May 2025

ROI Construction LLC
ROI Construction LLC
Why choose ROI Construction? Our Gold Standard guarantee is 100% customer satisfaction, 100% of the time! - It's that simple. No need to keep looking for “Contractor near me,” we are the top local Maryland and DC family owned Exterior company (est. 1974) that delivers the best results and a positive return on investment in the area! ROI also does a final walkthrough of every-single-job to ensure that we deliver a superior finished product for every ROI customer!
"Very pleased with the roofing and siding work performed by ROI Construction. Jose was especially helpful and very knowledgeable in all areas of home repair, including roofing, skylights, trim and siding. Brooke did a great job scheduling and managing the project. Highly recommend ROI for your roofing/remodeling needs."
Rachel S on September 2025
Why choose ROI Construction? Our Gold Standard guarantee is 100% customer satisfaction, 100% of the time! - It's that simple. No need to keep looking for “Contractor near me,” we are the top local Maryland and DC family owned Exterior company (est. 1974) that delivers the best results and a positive return on investment in the area! ROI also does a final walkthrough of every-single-job to ensure that we deliver a superior finished product for every ROI customer!
"Very pleased with the roofing and siding work performed by ROI Construction. Jose was especially helpful and very knowledgeable in all areas of home repair, including roofing, skylights, trim and siding. Brooke did a great job scheduling and managing the project. Highly recommend ROI for your roofing/remodeling needs."
Rachel S on September 2025
FAQs for glass block window service projects in Frederick, MD
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
The Frederick, MD homeowners’ guide to glass block window services
From average costs to expert advice, get all the answers you need to get your job done.
Is it time to upgrade your home’s windows? Learn more about window replacement costs, considering various window sizes, styles, and energy efficiency.
- •
Find out the cost to replace weatherstripping. Learn about material and labor costs, cost-saving tips, and what impacts your total price.
Learn how to install glass block windows with our detailed guide that shares what you need to know about buying materials, DIYing, and more.
This guide explains when money-saving handyman window repairs are appropriate and when it’s best to leave the job to a window specialist.
What is a window sash? Learn why this feature for letting in fresh air can make or break the rest of your window.
You may have seen glass block windows before without knowing their perks. Learn the pros and cons of glass block windows and how they can benefit your home.
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