Assess the condition, operation and performance of existing windows before deciding whether repair or replacement is appropriate. But how do you do window replacement the right way, avoiding every tiny mistake which later on can cost you more than the replacement itself?

Here are the top things you should know before making this renovation project:

Partial vs. Full Replacement

Usually, if we learn that our windows are damaged or old, we immediately choose full window replacement projects. Homeowners know the importance of high-quality windows and many of them become afraid when faced even with the smallest damage. Some problems can be repaired. An insert retrofit is a separate replacement approach: a new window is installed within an existing frame that is still sound, properly sealed and insulated.

With only replacing the sash, you get to keep the original look of your windows while also increasing the quality of insulation. In some cases, even the sash can be preserved and the efficiency increased just by upgrading to a better type of glass. Consult with an expert to learn about the true condition of your window and whether you need to do partial or full replacements.

Energy Star Ratings

After you decide on which materials need to be replaced, don’t go rushing to buy the first new ones you find. The main characteristic of a window is its energy efficiency and each one has different ratings and abilities. A higher Energy Rating (ER) indicates better overall energy performance on that rating scale; ER balances heat transfer, solar heat gain and air leakage.

An ER number alone does not establish ENERGY STAR certification. Check the Canadian certification and performance label for the exact configuration being quoted. You should also mind the characteristics of window glass, so pay attention to glass ratings such as U-value, R-value and VT.

House Window

These numbers express the quality of light and heat transmission through a glass:

U-value – represents the amount of heat loss. The lower the U-value, the better for your home.
R-value – represents resistance to heat flow. The higher the R-value, the better the window.
VT – represents Visible Transmittance or the amount of visible light your window passes through. If VT percentage is lower, the amount of light will be lower as well.

The Dangers of DIY

Lots of homeowners want to cut down the price and decide to make window replacement a DIY project. This isn’t recommended as even experienced window contractors have asked for a second hand when renovating their own homes. Poor installation can lead to water entry, drafts and operating problems even when the window itself is well made. Buying the best material for your window won’t matter if that material isn’t neatly placed in the opening. Usually, these cases end up in another replacement not long after the first one. Avoid this with at least consulting with a trained expert.

Choose the Right Type of Windows

You may read somewhere: “Casement windows are great for the kitchen and awnings for bathrooms”. Yes, that is generally true, but every home is different and requires different windows. Before you randomly buy 5 awning windows and 3 double-hung, carefully plan where they will be placed and always ask yourself the question: “Why do I need them?” Consider ventilation, reach, available clearance, cleaning access and any applicable emergency-escape requirements before choosing a style.