What are the pros and cons of glass block windows?

• <div>Installing <a href="https://www.angi.com/articles/what-are-benefits-glass-block-windows.htm">glass block windows has benefits and disadvantages</a>, as with most materials. The pros and cons can vary depending on the type of glass block and the window location.Pros<ul><li>Maintains privacy while letting light into the bathroom</li><li>Energy efficient</li><li>Sealed to prevent drafts</li><li>Aesthetically pleasing</li><li>Strong and secure</li></ul>Cons<ul><li>Costly to install</li><li>Challenging installation</li><li>Challenging repair</li></ul></div>

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Q: What kind of mortar do you use for glass block windows?

• <div>Glass block mortar is the best choice for glass block window units. It is specifically formulated for glass block window installation. Glass block mortar is usually a mixture of Portland cement, sand, and special chemicals. It is a white mortar that is applicable inside and outside your home. Do not use regular tile mortar because it may not have the binding strength and flexibility required for glass block windows.</div>

Q: Can you see through glass block windows at night?

• <div>You can still see vaguely into some types of glass block windows at night. Although there won&rsquo;t be clear definitions, passersby may still see shapes, shadows, and movement through the glass. If you want complete privacy, consider installing diamond glass block windows rather than the typical clear or wavy glass blocks.</div>

Q: Why is glass block so expensive?

• <div>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&rsquo;ll need to repair them before beginning the project, increasing your bottom line. </div>

Q: How much do glass block windows cost?

• <div><a href="https://www.angi.com/articles/what-are-average-glass-block-prices.htm">Glass block windows cost</a> about $710 to install, ranging from $460 to $980. The cost factors of installing this type of specialty window include the opening size, design, layout, height, glass block type, installation type, and location. There are many block styles to choose from, including colored, clear, wavy, diamond, and frosted.Consider the following price ranges of installing glass blocks based on size:<ul><li>25-by-25 inches: $60&ndash;$300</li><li>31-by-31 inches: $65&ndash;$350</li><li>36-by-36 inches: $85&ndash;$475</li><li>48-by-48 inches: $155&ndash;$840</li></ul></div>

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Verified Reviews for Glass Block Service pros in Patten, ME

*The Angi rating for Glass Block Service companies in Patten, ME is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Glass Block Service needs.

*The HomeAdvisor rating for Glass Block Service companies in Patten, ME is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Glass Block Service needs.

Last update on January 02, 2026

Reviewed in August 2025
Shad worked efficiently with impressive attention to detail. He showed up on time, went right to work and only stopped to eat. The biggest thing that impressed me however was his safety awareness, whenever old glass broke he took the time to clean it up and wore proper footwear. He had the best...
Shad Gagnon LLC
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Reviewed in June 2025
Noah exceeded my expectations at a competitive price . Clear communication, and fast! His estimate was spot on and it was clean and professional work. Noah did a 60amp sub panel install for my new garage, and also wired in four new outlets in my basement as I only had one down there. Thanks...
Parker Electric LLC
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Reviewed in May 2024
Tried to hire them. They changed the appointment we had. It was in the evening and I coudo it. Rescheduled. No show. Blocked me from communicating on Facebook. Complete a******.
central maine mechanical
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Reviewed in September 2023
Mike always answered phone and came out within a very short time, answered all questions, was very patient and explained a lot. He and his crew were courteous, they cleaned up the work site, and finished in a timely fashion. They also replaced a window, a glass door and redid the upper front of...
Maine Pro Roofing
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Reviewed in June 2023
I would recommend. They clean up when they finish.
Portanova Roofing North
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Reviewed in May 2023
They arrived in a timely manner and made sure everything was running smoothly before they left.
HVAC Solutions 207, LLC
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Reviewed in May 2023
Extremely Professional courteous and knowledgeable. Communicated the entire process of the detailed inspection. Would highly recommend!!
Main Choice Inspections, Inc.
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Reviewed in March 2023
Pleased with communication and work ethic.
Cevoli Contracting
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Reviewed in July 2022
I found Jay to be pleasant and easy to work with. He is very conscientious about his quality of work.
Barrett Pressure Washing
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Reviewed in May 2022
Extremely easy to work with. I made several design changes as we went along as ideas came to me. They were handled seamlessly and with no issues.
Leviathan Group LLC
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Portland Glass® has a history of success and a safety record that’s unmatched in New England. We are the providers of the best auto, home and business glass in Vermont, Maine & New Hampshire

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Glass Block questions, answered by experts

Glass block mortar is the best choice for glass block window units. It is specifically formulated for glass block window installation. Glass block mortar is usually a mixture of Portland cement, sand, and special chemicals. It is a white mortar that is applicable inside and outside your home. Do not use regular tile mortar because it may not have the binding strength and flexibility required for glass block windows.

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

You can still see vaguely into some types of glass block windows at night. Although there won’t be clear definitions, passersby may still see shapes, shadows, and movement through the glass. If you want complete privacy, consider installing diamond glass block windows rather than the typical clear or wavy glass blocks.

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.

Glass block windows cost about $710 to install, ranging from $460 to $980. The cost factors of installing this type of specialty window include the opening size, design, layout, height, glass block type, installation type, and location. There are many block styles to choose from, including colored, clear, wavy, diamond, and frosted.

Consider the following price ranges of installing glass blocks based on size:

25-by-25 inches: $60–$300
31-by-31 inches: $65–$350
36-by-36 inches: $85–$475
48-by-48 inches: $155–$840

The Patten, ME homeowners’ guide to glass block services

From average costs to expert advice, get all the answers you need to get your job done.

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Handyman for Multiple Small Project Service

Faucets, Fixtures and Pipes Repair or Replace

Electrical Switches, Outlets & Fixtures Install or Repair

Verified Reviews for Glass Block Service pros in Patten, ME

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ONE OVER TWO MASONRY

ONE OVER TWO MASONRY

Portland Glass of Bangor

Portland Glass of Bangor

Portland Glass of Millinocket

Portland Glass of Millinocket

Portland Glass of Damariscotta

Portland Glass of Damariscotta

K.C. Renovations

K.C. Renovations

Portland Glass of Augusta

Portland Glass of Augusta

Portland Glass of Farmington

Portland Glass of Farmington

See It N 3D Design & Technical Illustrations

See It N 3D Design & Technical Illustrations

Portland Glass of Rumford

Portland Glass of Rumford

Portland Glass of Presque Isle

Portland Glass of Presque Isle

The Patten, ME homeowners’ guide to glass block services

How Much Does a Glass Wall Cost? [2025 Data]

How Much Do Smart Glass Windows Cost? [2025 Data]

How Much Does a Glass Fence Cost to Install? [2025 Data]

8 Types of Window Glass and Their Features

9 Tips for Building a Stylish Curved Wall Using Glass Blocks

6 Types of Glass Shower Doors to Elevate Your Bathroom

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Get matched with top glass block pros in Patten, ME

Enter your zip and get matched with up to 5 pros

Need a pro for your glass block service project in Patten, ME?

Handyman for Multiple Small Project Service

Faucets, Fixtures and Pipes Repair or Replace

Electrical Switches, Outlets & Fixtures Install or Repair

Verified Reviews for Glass Block Service pros in Patten, ME

Find Glass block pros in Patten

ONE OVER TWO MASONRY

ONE OVER TWO MASONRY

Portland Glass of Bangor

Portland Glass of Bangor

Portland Glass of Millinocket

Portland Glass of Millinocket

Portland Glass of Damariscotta

Portland Glass of Damariscotta

K.C. Renovations

K.C. Renovations

Portland Glass of Augusta

Portland Glass of Augusta

Portland Glass of Farmington

Portland Glass of Farmington

See It N 3D Design & Technical Illustrations

See It N 3D Design & Technical Illustrations

Portland Glass of Rumford

Portland Glass of Rumford

Portland Glass of Presque Isle

Portland Glass of Presque Isle

The Patten, ME homeowners’ guide to glass block services

How Much Does a Glass Wall Cost? [2025 Data]

How Much Do Smart Glass Windows Cost? [2025 Data]

How Much Does a Glass Fence Cost to Install? [2025 Data]

8 Types of Window Glass and Their Features

9 Tips for Building a Stylish Curved Wall Using Glass Blocks

6 Types of Glass Shower Doors to Elevate Your Bathroom

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