REHAU uPVC Flush Sash Windows

Overview

REHAU flush sash windows, from REHAU's Rio flush fit range, have opening sashes that sit perfectly flush with the outer frame. They recreate the look of a traditional timber casement with none of the sanding and repainting, and they are the uPVC window we recommend for cottages, period terraces and anyone who wants a heritage look.

Free brochure: download the REHAU Rio Flush Fit brochure for full specifications, colours and options.

Rio is PAS 24 enhanced security accredited and tested at a UKAS centre to the highest BSI ratings for wind, water and air. Aliluxe designs, supplies and installs REHAU flush sash windows across London, Hertfordshire, Kent and Surrey, including period homes in conservation areas.

REHAU flush sash windows at a glance

System: REHAU Rio flush fit, 70mm deep and TOTAL70 compatible, UK manufactured.
Thermal performance: A energy rated, with a whole-window U-value of 1.3 W/m²K.
Glazing: 28mm or 34mm units, with a square-edge bead option for a sharper timber-style line.
Corner joints: fully welded, fully mechanical or mechanical/weld. Mechanical joints give the authentic timber-style corner.
Sizes: side-hung sashes up to 900 x 1300mm and top-hung up to 1200 x 1200mm.
Security: PAS 24 enhanced security accredited.
Hardware: Rio furniture including monkey-tail and teardrop handles, pegs and stays for a period look.
Guarantee: our 10-year insurance-backed guarantee.

Colours and finishes

Rio is offered in heritage-friendly finishes including Turner Oak woodgrain, Anthracite Grey Grained, Pearl Grey and Simply White, alongside the wider REHAU range of 24 colours. Grained foils have a subtle texture that reads as painted timber from the street.

What affects the cost of REHAU flush sash windows?

Every installation is made to measure, so we quote after a free survey rather than publishing prices. The main things that affect the cost are:

The number and size of windows, and how many opening sashes each has.
Your choice of corner joint (mechanical joints take longer to make than welded ones).
Colour and woodgrain foils, and whether you want a different colour inside and out.
Period hardware such as monkey-tail handles and stays.
Glazing upgrades such as acoustic or toughened glass, and Georgian bars.

Your quote is fixed and itemised, so you can see exactly what you are paying for.

How we install REHAU flush sash windows

Free survey: we measure each opening and check whether you are in a conservation area or have an Article 4 direction.
Design: we agree joint style, glazing bars, colours and hardware with you, using samples.
Made to measure: each window is fabricated from REHAU Rio profiles to suit the opening.
Installation: most homes are done in one or two days, with the reveals made good.
Sign-off: FENSA registration, a Building Regulations certificate and your guarantee.

Considering aluminium instead?

If you love the flush look, the Origin OW-80 Premium aluminium window is flush inside and out, with slimmer sightlines, Origin's Aerogel thermal upgrade and a powder-coated finish that lasts for decades. Our uPVC vs aluminium guide compares the two.

REHAU flush sash windows: frequently asked questions

What is a flush sash window?

A casement window whose opening sash sits level with the outer frame instead of sitting proud of it, like a traditional timber window.

Do flush sash windows look like timber?

Closely. The sash sits in line with the frame, and mechanically jointed corners mimic the joinery of a timber window. Grained foils add the final touch.

Are they suitable for conservation areas?

Many conservation areas accept flush sash uPVC in heritage colours, but rules vary by council and Article 4 directions can apply. We check before you order.

Are flush sash windows secure?

Yes. REHAU's Rio flush fit system is PAS 24 enhanced security accredited.

Are flush sash windows more expensive than standard casements?

Usually a little, because the frames take more work to make, especially with mechanical joints. Many homeowners feel the look is worth it.

Can I get matching doors?

Yes. REHAU Rio includes a single residential door and a French door, so the whole house can share the same flush look.

How energy efficient are they?

Rio flush fit windows are A energy rated, with a whole-window U-value of 1.3 W/m²K.

Areas we cover

We install REHAU flush sash windows across London, Hertfordshire, Kent and Surrey, including Richmond, Hampstead, St Albans and Tunbridge Wells.

Also see: REHAU flush fit doors, REHAU casement windows and REHAU sliding sash windows.

Book a free design visit: call 020 4581 8351, email sales@aliluxe.co.uk or request a quote online. Tick "Also quote me for aluminium" on the form and we will price both, so you can compare like for like.