Introducing our Slimline Window (OW-70)

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.

Download the Origin Windows brochure

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

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. Choose your size, configuration, colour, handle finish and any optional extras such as restrictor hooks or trickle vents to design a window perfect for your home. Every OW-70 comes with our inline handle, or you can opt for our cranked handle, which can be colour coded, for elegance you can both see and touch.

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 Anthracite Grey (7016M) and Hipca White (9110G). Both offer an elegant and modern 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.

Window in Anthacite grey with Matt finish

7016M (Anthracite Grey, Matt)

9110G (Hipca White, Gloss)

Configuration and size options

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

Key:Fixed Frame or Dummy SashTop HungLeft HungRight Hung

Available as either a casement or fixed frame 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.

Max frame size
	Side hung	Top hung
Max frame size	4.8m²
Max height
Max height	1300mm	1200mm
Max width
Max width	700mm	1200mm
Max glazed sash weight
Max glazed sash weight	26kg	50kg

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 PAS 24 certified; and has 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

A Full House of Origin Slimline Windows

After moving into their Buckinghamshire property in 2013, the Halls family decided to modernise their home with sleek grey aluminium windows - more specifically, with Origin’s new OW-70 Slimline Window.