Did you know? A 2021 survey revealed that nearly 80% of homeowners experienced mistakes during DIY home improvement, according to Storm Guard Roofing and Construction. These mistakes can lead to leaks, drafts, and moisture damage, which can be costly to fix.
As an amateur home renovator, I can understand why someone would be compelled to try replacing windows themselves, since it seems like a lot of money could be saved.
However, after witnessing botched installs that lead to air leaks, water damage, and even structural damage, I’m convinced that precise work is required when installing windows.
Without professional training, it can be impossible for the average homeowner to achieve precise heights, widths, and sealing considerations. Furthermore, improper measurements and sealing can void warranties and incur extremely costly functional inefficiencies in energy use.
That’s why in this blog post, we are going to understand the true importance of professionals, giving numerous insights to readers
Let’s begin!
Key Takeaways
- Understanding the importance of professional installation
- Discovering some hidden costs
- Looking at some long-term considerations
- Uncovering some safety risks

The Importance of Professional Installation
Even if you think that window replacement and installation may be a way to save money, a professional installation offers distinct benefits that will far outweigh the savings from a DIY window replacement. A licensed and certified installation company has the skill and, more importantly, experience.
If your windows are not properly installed, it is possible for the windows to leak and draft, cause structural problems, or void warranties, all of which are very costly in the long term.
Hiring professionals to ensure your windows operate, provide safety for the homeowner, and guarantee long-term value will certainly make the decision to either DIY or hire a professional one that is much easier than doing it on your own.
Costs Beyond the Initial Investment
Most homeowners become consumed by the direct cost of materials and installation when it comes to replacing windows, by neglecting other costs that they may incur, unbeknownst to them.
Be informed about the costs of DIY. While you may be trying to save money in your DIY project, sometimes a little knowledge can be dangerous, and regarding windows, you may incur energy losses, possible water damage, and costly bills, entirely meaningless.
Also, if you are doing things on your own and not hiring suitably qualified professionals, you will have the responsibility to make good any mistakes due to a lack of care and knowledge. Much less than the warranties or guarantees you may have (if from a reputable contractor).
Common Mistakes Made by DIY Enthusiasts
While it may seem like an economical choice to use DIY window replacement, many individuals make costly mistakes, which normally outweigh any project cost savings. One mistake many people make is measuring incorrectly, which usually leads to an awkward window fit, ultimately leading to drafts, increased energy loss, and other annoyances.
In addition, many people simply underestimate or minimize the importance of sealing properly; doing it by hand typically leads to water leak problems and potential irritating issues with mold.
Most serious DIYers do fail to read and follow all manufacturer instructions, which can easily result in lost warranties; thus, also mislabeling your DIY improvements with accidents or legal complications. Below, you can see a few other mistakes made by DIY enthusiasts.

Long-Term Considerations for Energy Efficiency
When getting new windows, the best option is to think about energy efficiency in the long term, but many DIYers do not give this much consideration. In order to reduce heat transfer, provide proper insulation, it’s important to choose the best window.
So DIYers may only buy a window that has a dual-pane low-E coating, but they may not know or purchase properly insulated frames and/or gas-filled spaces, etc. If the window is poorly installed, they may also not install properly some kind of draught-proofing, making air leaks or gaps or cold (or warm) air entry that will put up their utility bills over the period of its longer life.
As a further point of consideration, with no proper assistance on your project, you would not have access to energy technology that would make the most difference. In many small ways, the proper installation process will provide for the savings or performance expected with the windows.
Legal and Liability Issues
Homeowners engaging in DIY window replacement risk serious legal and liability consequences. Improper installation may violate local building codes, which may lead to fines or require taking remedial action.
If the window fails and causes injury to persons or property damage, your insurance may not cover damages because you performed the work without a license. Further, most manufacturer warranties will not be in effect any longer if not installed by a licensed and certified professional.
Hiring a licensed contractor will help ensure compliance with regulations and lessen the risk of costly legal or financial repercussions down the road.
Safety Risks Involved with DIY Projects
Unfortunately, this is where the misconceptions around DIY window replacement start. There are significant safety issues, particularly if you are not wearing appropriate gear, and you’re taking out large panes of glass.
Removing pieces of glass can cut, hurt a child, or cause serious injury. If you are replacing a few windows and height incidents are not a worry, it’s still not uncommon to have an accident, especially if you don’t have a ladder that is appropriate for the work being done, or scaffolding.
Depending on where the project site is, there could also be factors with electrical, if wiring is close enough. Most DIYers do not have the training or experience to deal with the risk.
Final Thoughts on Long-Term Value

While DIY window replacement may sound like a way to save money, the risk and cost associated with it can outweigh the money you save. If you perform an improper installation, you will be left with drafts, possible damage from water, a voided warranty, safety issues, and possibly even legal issues.
So, make sure that you take all the precautions before doing anything. Your safety is on your hand, and if it seems that it might be too much for you, make sure to reach out to a professional.
Can I change windows by myself?
Replacing your windows is an investment in your home that requires design and installation expertise that, for most homeowners, is best left to the experts. Buying and installing your windows may sound doable, but it’s extremely difficult to get right.
What is the best material for replacement windows?
Overall, vinyl window frames offer the best value for the price, but if you’re looking for a timeless, modern, or more durable look, you may want to consider clad wood windows, fiberglass window frames, or steel-framed windows.
Is it hard to DIY window replacement?
While DIY window replacement is possible for those with advanced carpentry skills, most homeowners will benefit from professional installation. Remember: even the highest-quality replacement window won’t perform properly if it’s not installed correctly.
How to measure windows for replacement?
Measure the window width from the inside jamb on the left side and right side of the window in three places – the bottom, middle and top.
Is replacing windows a good idea?
While old windows might still be functional, there’s a good chance they’re not very efficient. Windows that are over 20 years old should be replaced. If you’ve lived in your home for decades and have never replaced the windows, they are likely original to the house.