At OnTime Windows, we’re excited to introduce our latest offering: REHAU Flush Sash Windows, part of the innovative Rio flush fit range. These flush uPVC windows are designed to combine the classic appeal of traditional timber frames with the modern performance benefits of uPVC, making them an ideal solution for homeowners seeking style, efficiency, and long-term value.
The beauty of REHAU’s flush casement uPVC windows lies in their sleek, seamless appearance. The opening sash sits flush within the outer frame, replicating the timeless look of wooden casement windows—without the maintenance headaches. Whether you own a modern property or a period-style home, these flush sash uPVC windows blend harmoniously with various architectural designs.
When you choose REHAU’s flush uPVC windows, you’re investing in advanced insulation technology that helps maintain a comfortable home environment. Engineered to achieve excellent thermal performance, these windows can help reduce your energy consumption—leading to potential savings on your heating bills. Their strong weather seals keep cold air out and warm air in, ensuring you stay comfortable all year round.
Every homeowner deserves peace of mind—and peace and quiet! Our uPVC flush casement windows offer exceptional noise reduction, allowing you to enjoy a calmer home. Additionally, REHAU ensures each window is manufactured with robust materials and locking systems to meet rigorous security standards. In fact, Rio flush fit windows are PAS24 accredited, giving you extra confidence that your home and family are well protected.
REHAU’s Rio flush fit line comes in a wide range of colour options and finishes to match your style. From classic white or timeless Chartwell Green to modern Anthracite Grey (smooth or grained) and authentic woodgrain textures like Turner Oak, there’s a finish to suit every home décor. You can even choose a dual-colour option—one colour for the exterior and a different shade for the interior—to seamlessly tie in with your existing interior design.
Traditional timber windows require frequent upkeep. By contrast, flush sash windows crafted from premium-grade uPVC need minimal maintenance. A simple wipe-down is all it takes to keep them looking immaculate. This durability ensures that your new windows won’t warp, rot, or lose their pristine finish—offering lasting value and performance for years to come.
Sustainability is at the heart of REHAU’s approach. By recycling large volumes of post-consumer windows and doors annually, REHAU helps to minimise environmental impact. Rest assured that when you choose uPVC flush windows, you’re not only investing in your own comfort but also supporting responsible, eco-conscious manufacturing practices.
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At this stage, one of our experienced team members will schedule a visit to your property at a time that is convenient for you.
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After your expert consultation, we’ll provide a final quote for the work, this will be delivered by your preferred contact method and left with you, we are not a pressure sales company.
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When an order is placed, we will then send our technical surveyor who will take the final manufacturing measurements and specification for your order.
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All installations are carried out by highly trained professionals who ensure flawless results every time.
We’ve got answers to your most pressing questions. Don’t forget, if you have any other questions, you can always contact us.
Flush sash windows—like the REHAU Rio Flush Fit range we offer —feature a sash (the opening portion) that sits level with the outer frame, creating a sleek, uninterrupted surface. This design simultaneously captures the character of traditional timber windows and the benefits of modern materials. The result is a refined aesthetic with enhanced durability, noise reduction, and energy efficiency, making them an excellent choice for both classic and contemporary homes.
In many contexts, the terms “flush sash windows” and “flush casement windows” are used interchangeably. Both describe windows with a sash that closes flush with the frame, creating a flat, uniform appearance. With the REHAU Rio Flush Fit collection at OnTime Windows, you’ll find they offer a sophisticated, timber-like look, but with the low-maintenance advantages of modern uPVC. Whether referred to as flush sash or flush casement, the emphasis is on streamlined design and superior performance.
Pros
Authentic Timber Look: Rio Flush Fit windows from REHAU replicate the timeless feel of wooden frames without requiring regular painting or staining.
Energy Efficiency & Noise Reduction: Designed with multi-chambered profiles, these windows help lower heat loss and dampen outside sounds.
Enhanced Security: They can be manufactured to PAS24 standards, offering added peace of mind for homeowners.
Versatile Colour Range: A wide range of colours and finishes—from classic whites to modern anthracite greys—lets you match your window style to any décor.
Sustainability: REHAU’s commitment to recycling ensures that choosing their flush sash windows helps reduce environmental impact.
Cons
Slightly Higher Initial Cost: Premium engineering and customisable features can sometimes come at a higher price point. However, the long-term benefits in style, security, and energy savings can quickly offset any initial investment.
Less Variety in Opening Mechanisms: Flush casement designs typically open outward on side hinges, which may limit the range of configurations available compared to other window types like tilt-and-turn.
Yes. While flush sash windows were once exclusively made from timber, modern manufacturers like REHAU offer uPVC versions that combine the best of both worlds—traditional appearance and current-day reliability. At OnTime Windows, our Rio Flush Fit uPVC windows retain the beauty of wooden frames but eliminate the time-consuming upkeep. The result is a polished, wood-like aesthetic backed by modern features—such as excellent insulation, robust security fittings, and a durable finish that stays looking new for years.
Take a look at our eclectic range of beautiful doors. If you would like a quote, a member of our team will be more than willing to come and measure up for your new door.
OnTime Windows are proud to be authorised suppliers and installers of the following high quality window and door manufacturers.
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