Sometimes, custom windows aren’t just a design choice—they’re a necessity. You might be working with masonry openings, dealing with non-standard sizes, or planning a modern home with floor-to-ceiling glass. In many cases, the structure itself requires a unique approach that standard windows simply can’t provide.
That’s why custom windows are becoming more common—especially with the growing popularity of tilt and turn systems.
In this article, we’ll answer common questions about custom windows, explain their benefits, and help you understand how to choose the right contractor—for your next project.
What are custom windows? How do they differ from standard windows?
Custom windows are made-to-order solutions designed to fit openings or meet design requirements that standard windows can’t. Unlike mass-produced units with preset dimensions and shapes, custom windows are built specifically for your home’s layout, style, and functional needs.
They’re especially useful when you’re dealing with:
- Masonry openings that don’t match typical window sizes
- Renovations in older homes with irregular framing
- Modern designs that include large, expansive glass sections or non-rectangular shapes
While standard windows are efficient and budget-friendly for straightforward installations, custom models offer greater flexibility. You’re not limited by catalog dimensions, which means you can match roof lines, fill out unique wall angles, or frame views exactly as you want. If the frame can hold the heavy glass panes, you can create a truly custom experience for your house guests.
Where custom-shaped uPVC windows make sense
Not every home is built for standard windows. Some buildings require specific shapes to fit existing structures or match a modern design. Custom-shaped uPVC windows allow for that flexibility—without giving up on performance or durability.
Here are some examples of where custom shapes are commonly used:
- Arched or round windows – Often placed in stairwells, entryways, or bathrooms. They let in natural light and add a unique architectural element.
- Triangular or trapezoid windows – Useful in attic spaces or buildings with sloped roofs, where walls meet at angles.
- Corner windows – Common in modern homes. They bring in light from two sides and open up the view.
- Panoramic windows – A good fit for kitchens or dining areas that face a backyard. These wide, horizontal windows provide a clear view and connect indoor and outdoor spaces.
uPVC frames—especially when reinforced, like those used in OKNOPLAST Tilt and Turn windows—can be manufactured in large sizes without losing strength or performance. uPVC is also a reliable material for custom windows. It offers very good insulation, requires little maintenance, and is more affordable than wooden frames. For homeowners looking for a balance between quality, durability, and price, custom-shaped uPVC windows are a strong choice.
Tilt and turn uPVC windows – a growing trend
Tilt and Turn windows offer two opening options in one design. You can tilt the sash inward for safe ventilation or turn it fully inward for easy access and cleaning. This makes them especially practical for everyday use in bedrooms, kitchens, and upper floors.
When made from uPVC, Tilt and Turn windows also perform well in terms of durability and energy efficiency. uPVC is resistant to moisture, rot, and warping, and doesn’t require painting or regular maintenance. It’s also more affordable than wood or composite materials, making it a smart choice for long-term value.
OKNOPLAST’s tilt and turn systems, including PAVA and PIXEL, use multi-chamber profiles that improve insulation and comfort. These models support both double and triple glazing and come with design options like custom handles, decorative grilles, and dual-color frames. You can even opt for a full wrap, which means the chosen color is applied continuously from the exterior to the interior of the frame.
Arch Windows – Oknoplast
Tilt and turn windows – available shapes
One of the key advantages of uPVC is its flexibility in size and shape. With OKNOPLAST, you’re not limited to standard dimensions. We offer windows in a wide range of forms—including arches, slopes, circles, and trapezoids—and can create units up to 25 ft². Whether your project calls for a multi-panel feature window or something less conventional, our uPVC systems are built to adapt.
To explore the full range of custom shapes and finishes, we recommend browsing the OKNOPLAST product catalog.
Where to buy custom uPVC windows?
With custom windows, the choice of manufacturer matters. These are not off-the-shelf products. Every detail—shape, size, color, hardware—needs to be done right. A small mistake in measurement or installation can lead to costly problems, especially with non-standard designs.
At OKNOPLAST, we help homeowners get more than just a window that fits. We work closely with each customer to tailor the window to their project—whether it’s a unique shape, a specific opening style, or a custom finish. Our uPVC systems are highly customizable and built to meet both visual and performance expectations.
But we don’t stop at the product. Through our network of experienced dealers, we can also connect you with professional installers who know how to work with custom units. Proper installation is critical, and with complex shapes or large formats, precision becomes even more important. Our teams are trained to ensure that the fit, seal, and operation are exactly as they should be.
Choosing the right window starts with choosing a team that understands the full scope of your project. If you’re planning to install custom windows, we invite you to reach out for a quote or visit one of our trusted OKNOPLAST dealers near you. We’ll help you explore the options and guide you toward a solution that fits your design and performance needs.
About the Author: Oknoplast Team
Products.
