Glass Block Windows



Glass block windows have long been popular options for their unique aesthetic appeal which other windows don’t offer. These windows are versatile and used for a variety of purposes. They add light and the illusions of space to a walk-in shower while still offering privacy. Glass blocks also add an additional layer of security. This is great for basement and ground floor windows, especially considering that the most common glass block projects are basements and bathrooms.

Certain factory-built glass block windows meet federal ENERGY STAR efficiency guidelines and have the Energy Star designation on the glass itself. Most standard glass block windows have the same efficiency as thermal-pane windows and twice the efficiency as single-pane. Glass block windows are airtight and are able to reduce the amount of heat lost through the window due to their low-emissivity.

Most Glass Block Window companies offer the following with their product:

  • Several designs and patterns
  • Various color options
  • Customized etchings
  • A vented option to allow for airflow

Glass block windows’ main appeal stems from the following factors.



Glass blocks offer more versatility than the average consumer realizes. They can be used as a replacement for traditional windows or for obscuring unwanted views. Glass block windows are both water-repellent and clean easily. Square and rectangular-shaped blocks are the most popular, as well as hollow and solid.

Visibility and Light Transmission

The Glass Block transmits 80% available light in both directions. There are many surface textures that blur, or completely distort images and finishes which control the amount of light transmitted.

Energy Conservation

The term thermal resistance or R-value is a term used to determine windows’ thermal capabilities. Glass Block Windows have double the R-value of traditional single-glazed plate glass windows.


Did you know, modern glass blocks are sturdy enough to build large exterior walls that repel all weather elements. Glass blocks also resist fire, sound, and impact. It is more resistant to thrown objects and vandalism than many other window alternatives.

This is why glass block basement windows enhance security and act as a deterrent to potential intruders.

Durability and Cost Effectiveness

The durability and quality of glass blocks surpass so many other window alternatives. Glass blocks are scratch-resistant and work very well on a wall surface, requiring minimal maintenance. Any damaged or broken glass block can be easily replaced, without you needing to replace the entire structure or area of plate glass.