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Origin Doors

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The Origin Slimline Window (OW-70) is our slimmest window yet, combining strength with sleek design to create the finest aluminium window on the market today.

The difference between OW-70 and OW-80

The main difference between OW-70 and OW-80 is the way that they look.

OW-70 offers the slimmest sightlines at just 65mm wide, ideal for those looking to maximise on natural light and views. OW-80 may not offer sightlines as slim as OW-70, however, it offers an internal flush casement, which OW-70 cannot provide.

Both OW-70 and OW-80 are manufactured using premium grade aluminium, are durable and low maintenance, and come with an industry-leading guarantee of up to 20 years.
Learn more about our OW-80 window.

Ultra-slim sightlines

Completely bespoke and made using premium grade aluminium - just like all Origin products - the OW-70 offers a slimline alternative guaranteed to modernise your property.

Achieving a sightlines of just 65mm, the Origin Slimline Window is one of the slimmest windows available with a guarantee of up to 20-years. These ultra-slim sightlines mean less frame and more natural light, as well as better views. Available as either a casement or fixed window, the OW-70 is ideal for spaces where maximising glass size and light is essential.

Why aluminium is the first choice for replacement windows


The OW-70 is also available with two beading options, square or chamfered, giving you ultimate flexibility in specifying a window that suits not only your personal taste, but your building’s character.

Sleek flush external finish

Expertly designed to feature no overlapping external frames, our Slimline Window will add a trim and elegant appearance to your home. Whether it’s a townhouse or new build, the OW-70 adds a touch of class to any property; a joy to look at as well as use.

A window designed just for you

And, we’re not just saying that. From the size of your window to the colour of your handle, all of our orders are completely bespoke so that you can design a window that’s perfect for your home. Every OW-70 comes with either an inline handle or crank handle, both of which offer an elegance feel and finish – the choice is yours.

Inline Handles

  • BrushedBrushed
  • Anthracite GreyAnthracite Grey
  • ChromeChrome
  • GoldGold
  • SatinSatin
  • SilverSilver

Offset Handle

Available in any RAL colour to complement your window.

  • WhiteWhite

Over 150 RAL colours

With over 150 RAL colours to choose from, you’re bound to find the perfect colour windows for your home.

150 RAL colours

Popular colours - 1 week lead time

If you need your windows urgently, then choosing one of our popular colour options is for you. Available on just a 1 week lead time, our popular colour options for OW-70 are 7015M, 7016M, 7021M, 9005M, 9007M, 9910M and 9910G and 9910G/7016M (dual colour). All are able to offer and elegant finish for properties old and new. For a special touch to your property, you can choose from over 150 RAL colours which can be delivered in just 3 weeks.

Configuration and size options

The OW-70 window comes as a casement, bay or fixed window.
If you’re looking for gable or French windows then click here for the OW-80.

OW-70 window configurations
Key:Fixed Frame or Dummy SashTop HungLeft HungRight Hung

Available as either a casement, fixed frame, or bay window, the OW-70 remains a truly bespoke product offering from Origin. We’re able to accommodate most sizes and are on hand to help.

Side hungTop hung
Max frame size
Max frame size4.8m2
Max height
Max height1400mm1474mm
Max width
Max width950mm1374mm
Max glazed sash weight
Max glazed sash weight35kg50kg

Built with security in mind

The OW-70 is crafted using premium grade aluminium to offer the same levels of strength, durability and high quality that Origin products are renowned for.

Tested to some of the highest standards, the thermal efficiency exceeds current building regulations, is Secured By Design and PAS24 certified and has also achieved resistance to racking and static torsion certificates. The OW-70 may be slim, but it is also incredibly strong.

The lock itself is a stainless steel multi-point lock, which is fitted to accurately align with the keeps. The number of locking points vary depending on the size of the window, meaning security is not compromised no matter how big your window is.

So confident in our design, we offer an industry-leading guarantee of up to 20‑years, in non-marine environments. So, you can rest assured that your Origin Windows will last for decades.

Impressive thermal efficiency

OW-70 can achieve a U-value of up to 1.2W/m2K, which meets current building regulations. When chosen with a short leg, the OW-70 window achieves an A energy rating.

An eco-friendly alternative

Feel good about your purchase, knowing that your windows have been made using one of the most environmentally friendly metals on the planet: aluminium. Aluminium can be recycled infinitely, with up to 85% of all aluminium ever produced still in circulation today, making it one of the most sought-after materials in construction. Compared to other popular door and window materials, such as uPVC and timber, aluminium is by far the more ecological choice.

Explore our case studies

Explore our range of windows

Whether you’re planning a replacement, renovation or a new build, we have a range of window types and configurations available to suit your desired aperture. Whether it’s a Bay, Casement, Fixed, Bi-folding, French or Gable window, each type is guaranteed to deliver smooth, flawless and effortless operation as it is made using premium-grade aluminium. Every aspect is completely tailored, including your size and colour scheme.

OW-70 slimline window