The more expensive component between a large glass and a window frame is typically the glass. This is due to several factors, including the size, material, and complexity of the glass. Large glass panes are more expensive because they require more material and are more difficult to produce than smaller ones. Additionally, the cost of the glass can be significantly higher than that of the frame, especially for high-quality or specialty glass options.

According to a report by the National Glass Association, the cost of a large glass pane can range from $50 to $200 per square foot, depending on the type of glass and the complexity of the installation. In contrast, the cost of a window frame is generally much lower, ranging from $10 to $50 per square foot. This discrepancy is due to the fact that glass is the primary material that determines the functionality and aesthetic of the window, while the frame serves primarily as a support structure.

High-quality glass options, such as low-emissivity (Low-E) glass or tempered glass, can be particularly expensive. Low-E glass is designed to reduce heat loss and gain, making it energy-efficient, while tempered glass is much stronger and more resistant to breakage. These features add to the cost of the glass, making it the more expensive component in most window installations.

Furthermore, the installation process for large glass panes is more complex and requires specialized equipment and skilled labor. This can also contribute to the higher cost of the glass compared to the frame. While the frame installation is relatively straightforward, the glass must be carefully handled and installed to ensure proper fit and functionality.

In summary, the glass is generally more expensive than the window frame due to its larger size, higher material costs, and the complexity of the installation process. This is particularly true for high-quality or specialty glass options that offer enhanced energy efficiency and safety features.