For an Ontario homeowner, investing in replacement or upgrading windows is one of the top investments that can be made. If you’ve begun researching your choices, you’ve probably already come across the two most popular types of windows available today: vinyl windows and fibreglass windows. They are both great materials, but they aren’t the same and the correct material will depend a lot on the type of home, its budget, climate risks, and long term plans.
This guide provides the straight-talking, no-nonsense comparison homeowners in Ontario need, from cost to durability, to energy performance to looks and maintenance, to help them make a confident and informed choice.
Why Ontario Homes Demand High-Performance Windows
Before you start to debate the merits of vinyl windows against fibreglass windows, it’s important to understand why window material is a significant factor when it comes to windows in the Ontario region. The province has a very large range of weather conditions during its various seasons: hot summers with temperatures reaching up to 30°C and cold winters with temperatures regularly plummeting to below -20°C in Northern Ontario, the Ottawa region and the cottage country area.
The freeze-thaw cycle puts a tremendous amount of stress on window frames. Seal failure, air leaks and condensation problems occur over time with materials that expand and contract differently than the glass inside. This is why material selection is so important – and why both vinyl and fibreglass have become the most popular material choices for window replacement in Ontario.
What Are Vinyl Windows?
Vinyl windows are PVC (polyvinyl chloride) plastic and are the standard window material for Canadian residential windows for many years. They are plentiful, made by dozens of companies throughout Ontario, and are the most commonly installed window type in today’s Canadian home.
Key characteristics of vinyl windows:
- Made from extruded PVC sections
- It comes in various styles, colours and sizes
- Insulated with hollow or foam blocks in the frame
- Do not need to be painted or stained
- Highly waterproof, rot resistant and insect resistant
What Are Fibreglass Windows?
Fibreglass windows are created from glass fibre reinforced polymer, which is a similar material used in boat hulls and airspace components. They are a newer option on the residential window market than vinyl, and are enjoying a fast rise in popularity with Ontario homeowners who want high-performance, long-lasting windows.
Key characteristics of fibreglass windows:
- Built using pultruded fibreglass composites
- Very high strength-to-weight ratio
- Can be painted and refinished unlike vinyl
- Low thermal expansion and contraction
- Usually come with longer warranties and higher price tags
Vinyl vs Fibreglass Windows: The Head-to-Head Comparison
1. Cost – What Will You Actually Pay in Ontario?
Vinyl has a clear edge in this regard. Vinyl windows are much less expensive than fibreglass windows, in material and installation.
In Ontario, an average vinyl double-hung window runs between $400–$900, once installed, based on the window size, the glazing package and the installer. Generally the window cost for the same application is $800 to $1,800 or more depending on the brand of the fibreglass windows and the size.
The cost difference really adds up when you’re replacing the whole house, such as 12 – 15 windows. Vinyl is often the more cost effective option for homeowners on a budget, home buyers, or home sellers looking to sell their home quickly.
Verdict: Vinyl wins on upfront cost. Fibreglass is a longer-term investment.
2. Durability and Longevity
In terms of strength and durability, fibreglass windows have an obvious edge to vinyl windows. Compared to vinyl, fibreglass is about eight times as strong, and it will not warp, sag or become brittle over time like lower quality PVC.
This is important in the tough Ontario weather. This is because repeated freeze-thaw cycles tend to cause stress to the vinyl frames, and lower quality vinyl frames can begin to warp or experience seal deterioration in 15 to 20 years. Reputable vinyl window manufacturers from Ontario, however, ensure that the windows can last 25 to 30 years with hardly any concerns.
By comparison, fibreglass windows last the lifetime of the home when correctly installed, and are routinely covered by 30-40 year warranties. They have excellent dimensional stability (expansion and contraction coefficient nearly equal to that of glass), making seal failure and air infiltration extremely unlikely.
Verdict: Fibreglass wins on long-term durability and lifespan.
3. Energy Efficiency — Which Keeps Ontario Homes Warmer?
Vinyl and fibreglass windows can be joined with the proper window glass packages to attain high levels of energy efficiency (double or triple pane glass, low-e coatings, and argon or krypton gas fills). The frame material also has an impact on the frame’s thermal performance, though.
Vinyl frames are also good thermal insulators: PVC has a low thermal conductivity. Multi-chamber vinyl frames (air-locked) work best in cold climates. The majority of quality vinyl windows from Ontario will meet or exceed the requirements of the ENERGY STAR for the Northern Canada climate zone.
Fibreglass frames are also good thermal insulators and have a high dimensional stability, so will preserve their sealing characteristics over time. This also means that your fibreglass window will retain its energy efficiency for a longer time than vinyl windows, as the vinyl windows start losing their efficiency due to the weakening of the seals and aging of the frames.
Fibreglass is becoming the material of choice for architects and building scientists for passive house, heritage or high-performance new construction in cooler climates in Ontario.
Verdict: They both do a decent job. Fibreglass keeps up well and will retain its efficiency over a longer period, while vinyl will work well if new and correctly specified.
4. Aesthetics and Design Flexibility
The aesthetics of vinyl windows have made significant improvements over the years. With colored vinyl windows in dozens of colours, from woodgrain foil finishes that resemble painted wood, to windows in almost every style, from casement to awning, bay and picture windows, they offer an endless selection of colour choices and window styles.
There is one drawback to vinyl, however, it can’t be repainted after it is produced in one colour. Vinyl window frames can’t be changed in colour years later if you want to.
Wood windows can, however, be painted in, whereas fibreglass windows cannot. This results in their being a favorite option for heritage houses in neighborhoods such as Toronto’s Annex neighbourhood, older Oakville streetscapes, or any project where design flexibility over time is important. Fibreglass can also be used to offer finer detail profiles, allowing slimmer sightlines so as to achieve architectural look.
Verdict: Verdict is Fibreglass – flexibility in design. Vinyl is perfect for typical uses.
5. Maintenance Requirements
Vinyl windows and fibreglass windows are low maintenance in comparison to wood windows, but are slightly different when it comes to maintenance.
Vinyl windows can be cleaned every now and then using a mild soap and water. Don’t need to be painted, stained or sealed. They can however discolour over time, especially if used in south facing applications with a lot of UV energy, and surface scratches are difficult to repair.
The original fibreglass windows are also low maintenance. When painted, they will need repainting in about 10 – 15 years, depending on the exposure. However, this is their benefit too: They can be painted when they start to show signs of aging, while a vinyl window will need to be replaced if the color fades or if the window is scratched.
Verdict: Tie – vinyl is less expensive to maintain overall, but if required fibreglass may be restored easily.
6. Environmental Considerations
For Ontarians who want to do their part to save the planet, fibreglass has a slight advantage. The use of chlorine and other chemicals is a concern with PVC production, and PVC vinyl windows are not easy to recycle at end-of-life. Fibreglass windows will last for longer, which means fewer window replacements, and it is more stable from an environmental standpoint, but not all-fibre glass windows are entirely green.
Verdict: Fibreglass slightly edges out other materials in terms of its environmental attributes.
Which Window is Right for Your Ontario Home?
Here’s a practical summary to guide your decision:
Choose Vinyl Windows if you:
- With medium budget and plenty of windows to replace
- Am making a home sale imminent
- Possess a newer and/or regular residential dwelling
- Several highly energy-efficient solutions that are easy to maintain and repair?
Choose Fibreglass Windows if you:
- Are building or renovating a high-performance or custom home
- Own a Historic or Architectural Property
- Long-term plan to live in your home and you want longevity
- Design for flexibility and future repainting of frames
Final Thoughts
There is no one right answer to the vinyl vs fibreglass windows debate, only a right answer for you! For most homeowners in Ontario, vinyl is the smart and practical, affordable and budget-friendly option. For the most extreme climates and most design freedom and performance in Canada, fibreglass is the choice.
Regardless of your selection, make sure it’s made with quality. The frame material will be far less important than a good manufacturing window company in Ontario, correct installation and proper glass specifications. Contact 3 or more quotes, inquire about ENERGY STAR ratings, and do not base your decision solely on the cost. You want your windows to last for many years, so select them accordingly.
Frequently Asked Questions (FAQs)
Q1: Are fibreglass windows worth the extra cost in Ontario?
Yes, for long term homeowners. The longer the life expectancy of a fibreglass window, the longer its energy efficiency lasts, and the more design options are available. Higher initial prices typically make up for this long-term investment if you intend to remain in your current home for a long period, 20 years or more.
Q2: Do vinyl windows hold up in Ontario winters?
The well-made, quality vinyl windows manufactured in Ontario, work quite well in colder climates. For cold weather energy efficiency look for multi-chamber frames, warm edge spacers and triple panes with multiple-gas options.
Q3: Can fibreglass windows be painted to match my home's exterior?
Yes. One of the main benefits of fibreglass is its ability to surpass vinyl. Exterior grade paint can be used on fibreglass panels, and refinishing can be done for instance when you want to change your home’s colour scheme.
Q4: What is the lifespan of vinyl vs fibreglass windows?
Good quality vinyl can last anywhere from 25 to 30 years. Many fibreglass windows come with warranties between 30 to 40 years and should last as long as the house itself if installed and maintained correctly.
Q5: Which window type qualifies for Ontario or Canada Greener Homes grants?
Vinyl and fibreglass windows are eligible for the Canada Greener Homes Grant as long as they are rated ENERGY STAR for the climate zone you live in. Don’t assume, always confirm window specifications with window suppliers and review the most up-to-date eligibility requirements for grants from Natural Resources Canada.
Q6: Are fibreglass windows better for older or heritage homes in Ontario?
Yes, in most cases. Its slim profiles and paintability combined with dimensional stability make fibreglass more suitable and appealing for the heritage retrofitting challenge where these attributes are critical. It’s for this reason that many fibreglass restoration architects in Ontario are mandating it.
Q7: Is there a noticeable difference in noise reduction between vinyl and fibreglass windows?
The glazing package (the number of glass panes, thickness of the glass and gas fill) is a far more significant factor in sound reduction than the frame material alone. When used with the same glazing, vinyl and fibreglass frames provide comparable acoustic performance.