Are all PVCu windows the same?
If you’re researching new windows for your home, you’ve probably asked yourself: are all PVCu windows the same?
At first glance, many PVCu windows can look very similar, white frames, clean lines, double glazing, but what’s behind the frame can vary significantly.
In this blog, we’ll explain the key differences between PVCu windows, answer common questions like ‘are all PVCu window handles the same size?’, and compare PVCu vs aluminium windows to help you make the right choice for your home.
Are all PVCu windows the same?
The short answer is no, and the differences can affect everything from security and energy efficiency to lifespan and appearance.
While all PVCu windows are made from unplasticised polyvinyl chloride, the quality of materials, design, and manufacturing standards can vary greatly between suppliers and installers.
Here’s what really sets PVCu windows apart:
Frame quality and profile design
Not all PVCu frames are created equal. Higher-quality profiles:
Use virgin PVCu rather than recycled materials
Are reinforced with galvanised steel or advanced composite cores
Resist warping, discolouration, and cracking over time
Cheaper profiles may look fine initially, but can become brittle, fade, or lose their shape after years of exposure to British weather.
Energy efficiency and thermal performance
Energy efficiency is one of the biggest reasons homeowners choose PVCu windows, but performance varies.
High-quality PVCu windows offer:
Multi-chambered frames to trap heat
Low-E glass coatings
Argon-filled double or triple glazing
Lower U-values for improved insulation
Poorer-quality windows may meet minimum standards but won’t deliver the same long-term energy savings or comfort.
Security features matter
All PVCu windows should be secure, but some go much further than others. Premium systems include:
Multi-point locking mechanisms
Reinforced frames
Internally beaded glazing to prevent removal from outside
At Bedfordshire Windows, we always recommend windows that exceed basic security requirements for added peace of mind.
Are all PVCu window handles the same size?
This is a common question, and the answer is no. While many PVCu window handles follow standard measurements, there are key differences, including:
Screw hole spacing
Spindle length
Handle style and operation
This means replacement handles aren’t always universal. Choosing the right handle depends on the window system used and how the window was originally manufactured.
A professional installer ensures handles are:
Correctly sized
Securely fitted
Easy and comfortable to use
PVCu vs aluminium windows, what’s the difference?
Another frequent question we hear is how PVCu vs aluminium windows compare.
PVCu windows
Pros:
Excellent thermal efficiency
Cost effective
Low maintenance
Ideal for most traditional and modern homes
Cons:
Slightly bulkier frames compared to aluminium
Aluminium windows
Pros:
Slim, modern sightlines
Extremely strong and durable
Ideal for contemporary designs and large panes of glass
Cons:
Higher cost
Typically slightly less insulating than high-end PVCu
For most homeowners in Bedfordshire, PVCu windows offer the best balance of performance, value, and energy efficiency, while aluminium is often chosen for specific design-led projects.
Why installation matters as much as the window
Even the highest-performing windows will underdeliver if they are not installed correctly. A poorly fitted window can lead to thermal bridging, draughts, and moisture problems. To ensure a flawless installation in a new build, or window replacement, ensure you buy quality products with well-insulated frames, excellent seals, and gaskets. Gas-filled cavities, Low-E glass, and warm-edge spacers will reduce heat transfer.
That’s why choosing a trusted local installer is just as important as choosing the window itself. Check out our page on TrustATrader, we have reviews from over 700 satisfied customers.
Thinking about new windows?
If you’re considering replacing your windows and want honest advice on PVCu and aluminium options, the team at Bedfordshire Windows is here to help.
Visit our website and read the following blogs for more information:-
Replacing windows and doors in older homes
Why in-house manufacturing means superior quality
Double glazing quotes
Get in touch today for expert guidance and a no-obligation quotation.