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Origin Doors

Available in both OW-70 Slimline and OW-80 Premium ranges, the Origin Casement Window combines traditional design, advanced manufacturing and versatile premium grade aluminium for high levels of security and thermal efficiency to complement any type of build.

OW-80 Casement Window

For a truly unique window offering, an industry-first internal and external flush casement, the OW-80 Casement Window will not disappoint.

Completely bespoke, OW-80 casement windows can be manufactured up to 7sqm in over 150 RAL colours to suit your preference. Colour-coded gaskets and handles allow you to add personality to your windows if you wish.

OW-70 Casement Window

Equally sleek and contemporary, the OW-70 Casement Window may not offer as many customisation options as OW-80, however, it does offer ultra slim sightlines of just 65mm. Able to accommodate sizes of up to 4.8sqm, the OW-70 provides a modern finish for any home.

Made from the same premium grade aluminium as all Origin products, OW-70 offers the same level of security as OW-80 and comes with the same industry-leading guarantee of up to 20 years.

OW-80 vs OW-70 Casement Windows

Both OW-70 and OW-80 casement windows offer a guarantee of up to 20 years, a contemporary look and exceptional levels of strength and security. However, there are some key differences between the two window ranges, show in the table below.

OW-70 SlimelineOW-80 Premium



Ultra-slim sightlines of 65mm from sash to frame


Slim sightlines of 91mm from sash to frame

Flush casement


External flush casement only


Internal and external flush casement

Popular colours

  • 7016M (Anthracite grey)
  • 9110G (Hipca white)
  • 7015M (Slate grey)
  • 7016M (Anthracite grey)
  • 7021M (Black grey)
  • 9005M (Jet black)
  • 9007M (Grey aluminium)
  • 9910G (Hipca white)
  • Natural oak
  • Golden oak
  • Walnut
  • Mahogany

Popular colour-coded handles

  • Anthracite grey
  • White
  • Anthracite grey
  • Slate grey
  • Black grey
  • Jet black
  • Dark metallic silver
  • White

Marine finish


Marine finish not available


Marine finish available

Glazing units


Double glazing available, as well as triple glazing and Aerogel for specific sizes


Double and triple glazing options as well as Aerogel

Guarantee length


Up to 20 years


Up to 20 years

Thermally efficient

Origin Casement Windows offer standard double glazing and thermally efficiency that exceeds current building regulations thanks to a sophisticated polyamide thermal break, built in to the window frames.

OW-80 windows can go the extra mile to achieve a U-Value as low as 0.9 using sophisticated Aerogel technology, used in space suits and space shuttles, and triple glazing.

Our dedication to thermal efficiency means you’ll not only be able to enjoy a warm home in winter and a cool home in summer, you could even save money on your energy bills.

Highly secure

Every Origin Casement Window is installed with Yale’s renowned Encloser Locking system, offering the highest level of security. Engaging cylindrical cams into the window keeps, this Encloser Lock is clean and simple, PAS 24:2012 certified and exceeds the latest security standards - giving you complete peace of mind that you and your home is secure.

Each window can also be built with the highest grade stainless steel hinges, capable of carrying exceptionally heavy loads. Hinge guards, locking handles and crimped frames work together to further improve impenetrability of our windows, making the Origin Window one of the most secure on the market today.

Explore our case studies

Explore our range of windows

What’s the difference between OW-70 and OW-80? Discover which of our aluminium windows would best suit your property

OW-70 slimline window