REAHU Rio

Flush Sash Windows

Traditional timber looks - modern PVCu performance.

Flush sash windows—also known as flush fit windows - offer a timeless, elegant aesthetic by sitting flush within the frame, replicating the appearance of traditional timber windows. Whether you're restoring period homes or upgrading modern properties with a clean, minimalist style, flush sash windows offer an unbeatable combination of visual appeal and low-maintenance PVCu durability.

At Polyframe, we supply high-quality flush sash window systems from one of the UK’s most trusted profile houses: REHAU. Designed with installers in mind, REHAU Rio provides flexible options, easy installation, and exceptional finish quality.

Why choose PVCu flush sash windows from Polyframe?

  • Authentic Timber-Look Aesthetics – Perfect for heritage properties, conservation areas, or premium design-led builds

  • Modern Materials – All the charm of timber, with the durability and low maintenance of PVCu

  • Outstanding thermal performance - Achieve U-values as low as 0.8 W/m²K to boost efficiency and reduce energy bills.

  • Premium finish - Mechanical welds and a wide choice of colours including white, woodgrain, and RAL finishes.

  • MILA Monkey tail handles available for the true authentic look.

  • Trusted REHAU partner - Over 30 years of unbroken supply partnership with REHAU — proven reliability.

  • Built-In security - Multi-point locks as standard, with PAS24 upgrade options available.

  • Fully accredited - Meets all major standards: PAS24, BS7412, and Secured by Design.

  • Specialist trade support - Marketing and technical support available for trade and commercial installers.

  • Fast turnaround - Lead times from just 5 working days, helping you stay on schedule.

  • Reliable delivery - Our dedicated fleet ensures on-time, in-full deliveries every time.

REHAU Rio Window
REHAU Logo

RIO PVCu flush sash windows

REHAU Rio from Polyframe

Crafted for character. Engineered for performance.

The REHAU Rio flush fit system offers true timber-style design with all the benefits of advanced PVCu engineering. Perfect for homeowners seeking authentic detailing, it features deep bottom rail options and heritage-style handles. It’s equally suited to period properties and contemporary homes looking for sleek lines.

Key Features & Benefits

  • Fully flush sash and frame exterior for true timber aesthetics

  • Available in chamfered or sculptured internal profiles

  • Internally glazed for enhanced security

  • PAS24 compliance available for added peace of mind

  • A+ energy ratings are achievable

  • 10-year product guarantee

REHAU colours from Polyframe

Available in a choice of colours & finishes

With 12 standard colours and over 22 options in total, there's something to suit every project style. REHAU flush sash windows are available in a wide range of woodgrain-effect foils and can also be spray coloured to any RAL shade. Whether your customer wants a modern Anthracite Grey, traditional Rosewood, or something bolder, we can deliver a finish that enhances the overall look of the property.

Colour availability may vary depending on the window style selected.

REHAU brochures & technical downloads

Access everything you need to spec, sell and install REHAU RIO windows.

Ready to get started?

As a trusted REHAU window fabricator, Polyframe makes it easy for trade installers to access market-leading products, expert support, and reliable delivery nationwide.

Speak to your local Polyframe team today for pricing and product availability.

Access our latest REHAU product guides and specifications.