Looking at replacement windows for your home can be a daunting task, with so many options available such as window types, materials, finishes, glass types and energy efficiency options, it’s hard to know which to choose.
The remainder of this Windows Price Guide article will look in detail at the various types of window glass replacements available, giving you the information you need to make an informed decision when it comes to selecting the glass for your window replacement project.
The Types Of Glazing Layers Available
There are three main types of glass to choose from, these include:
- Single glazed glass
- Double glazed glass
- Triple glazed glass
Single glazing is extremely thin and very rarely used in any new construction homes or replacement window projects today. The main problem with single glazing is that it only provides a very thin layer between the inside of your home and the outside, meaning heat loss and heat gain are extremely high. However, single glazed units would comply with current standards and would certainly not meet the guidelines outlined by the Energy Star organization.
Double glazing is the most popular option, all replacement windows will usually come with double glazed panes installed as standard. In double glazed units, there are two layers of glass, usually separated by a gas fill of either Argon or Krypton. The main benefit of double glazing over single glazing is the thickness of the glass, this provides resistance to heat loss and heat gain, making the windows far more energy efficient.
The final option is triple glazing, whilst this is becoming more common in window installations, it’s still far less common than the aforementioned double glazing. Triple glazing, like double glazing, offers more resistance to heat loss and heat gain, making the windows more energy efficient. However it’s unclear whether or not triple glazed windows are worth the price. Our concise guide examines the benefits of triple glazing.
The Glass Options & Variances
With triple glazing and double glazing, there are various additional options relating to the finishes and additions you can add to your panes of glass. These additions are added with the intention of improving the energy efficiency of the window. Such options include:
- Low-E Glass
- Heat Absorbing Glass
- Reflective Glass
- Clear Glass
Low E (Low Emissivity) Glass
Low-E glass has a special coating or “tinting” added into the glass during the manufacturing process, this aims to reflect light from the outside, off the surface of the glass. This can reduce the heat passage through the window by up to 70%, keeping the room cool whilst still allowing 100% light to pass through.
Heat Absorbing Glass
Heat absorbing glass is similar to low-e glass in that the window contains a tinting which reduces the amount of heat allowed through the window, or the solar heat gain coefficient (SHGC). However, in comparison to low-e glass, heat absorbing glass is a little less effective since it still allows heat to pass through the window by conduction and radiation.
Reflective glass does what both heat absorbing glass and low-e glass do, however reflective glass also reduces significantly the amount of light passing through the window. So, whilst this reduces solar SHGC it also reduces the visible transmittance (VT), making the room darker. Reflective glass is usually suitable where you intend to darken the room, such as in office blocks, it’s not usually used in residential properties.
Clear glass is just that, clear! This has no coating, no film layers and no reflective glass, which means it just allows light straight through. Unfortunately though, clear glass does not control heat loss, heat gain or have any condensation resistance to speak of. Clear glass is extremely inefficient in terms of energy efficiency.
The Window Glass Replacement Cost
The cost of window glass replacement will vary greatly depending on several main factors, including:
- The size of the glass pane
- The number of panes you’re having replaced
- The type of window you’re having the glass installed into
- The type of glass, I.e. single, double, triple glazed
- The type of glass finish, I.e. low-e coatings, gas fills, clear glass, reflective glass
However, the guide below gives an overview of the replacement cost, including & excluding installation, for standard single, double and triple glazed glass. These prices include the basic energy efficiency options of low-e glass and gas fills where applicable. Note that these glass prices are for guidance only and for an accurate quote, we recommend you speak with one of our local contractors by submitting your details through our free price quote system.
Table 1: Window Glass Replacement Cost By Glazing Type
|Type Of Window Glazing||Average Cost (Including Installation)||Average Cost (Excluding Installation)|
Overall, understanding the options available to you is important, make sure you ask about energy efficiency when you get your free quote from one of our local contractors, they will be able to offer you in-depth guidance on your available options.