W+Window Centre PlusWindows & Doors · Middlesbrough

Windows

Liniar 70mm uPVC Casement Windows

The most popular style of uPVC window in the UK — timeless, versatile and now built on Liniar's market-leading multi-chambered 70mm profile. We specialise in them, so we get them right every time.

Exterior close-up of a white Liniar 70mm uPVC casement window with slim sculptured sightlines

Why Liniar 70mm?

Liniar has updated the classic casement with a slim, sculptured 70mm profile — the same width as the industry standard, but with better thermals, cleaner sightlines and a stronger seal.

  • Multi-chambered 70mm profile for high thermal efficiency
  • EnergyPlus six-chamber upgrade — A+ rated with cost-efficient double glazing
  • U-values as low as 0.8 W/m²K (triple glazed)
  • Sculptured profile — classic styling
  • 28mm double or 36/40mm triple glazing options
  • Fully recyclable, 100% British-made uPVC
  • Slim sightlines maximise natural light
  • Internally beaded for improved security
0.8
W/m²K

Triple-glazed U-value

70mm
profile

Multi-chambered frame

A+
rating

Energy performance

Beautifully manufactured. Expertly fitted.

Every window is surveyed and manufactured to exact spec, then can be fitted by an independent installer from our trusted fitting network. No surprises — just tidy work and a guarantee we stand behind.

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Chartwell Green Liniar 70mm uPVC casement window installed on a red brick home in Teesside

FAQs

Window questions, answered

What energy ratings are available on your Liniar windows?+
Our Liniar 70mm casement windows are available C-rated, A-rated and A+ rated with the EnergyPlus six-chamber upgrade. Triple-glazed options reach U-values as low as 0.8 W/m²K.
Do you make the windows yourselves?+
Yes. We are a Certass registered manufacturer based in Middlesbrough and every window is beautifully manufactured in-house to your exact sizes before being fitted by an independent installer from our trusted fitting network.
What colours and finishes can I have?+
White, cream, Chartwell green, Irish oak, rosewood, anthracite grey (inside and out or dual colour) and many more Liniar foils — including sculptured profile only, which is the style we specialise in.
What glass options do you offer?+
Toughened, obscure, sandblast, Georgian bar (full or tops only), leaded and bevelled glass are all available. Triple glazing and low-E coatings are options on every frame.
Are the windows guaranteed?+
Yes — every installation carries a 5 year guarantee, backed by our 15+ years of experience supplying homes across Teesside and the North East.