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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.
Proudly manufactured in the United Kingdom at our Buckinghamshire facility.
Discover our industry leading guarantees for complete peace of mind.
Our doors help your house stay warm in winter and cool in the summer.
We’re committed to your safety through compliance and accreditation initiatives.
A wide range of colour and finish options ensures that there is a style to suit your home.
Find out how our unbeatable delivery promises can help your project.
All Origin products are tailor-made to your requirements by our higly skilled team.
Find out how our doors benefit from the strength, resilience and versatility of our premium grade aluminium.
Our expert engineering allows you to focus on enjoying the products rather than taking the time to maintain them.
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.
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.
- Anthracite Grey
Available in any RAL colour to complement your window.
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
Windows with you in as little as 24-hours
If you need your windows urgently, then choosing one of our popular colour options is for you. Available in as little as 24 hours, our popular colour options for OW-70 are 7015M, 7016M, 7021M, 9005M, 9007M, 9910M, 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 4 weeks. Please note - your windows will be delivered to your chosen Partner and the install will be based on glass and their installation availability.
7016M (Anthracite Grey, Matt)
9910G (Hipca White, Gloss)
Configuration and size options
The OW-70 window comes as a
If you’re looking for 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, 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 hung||Top hung|
|Max frame size|
|Max frame size||4.8m2|
|Max glazed sash weight|
|Max glazed sash weight||35kg||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 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 leading U-Value rating of 1.2 W/m2K when using triple glazing panes, which meets and beats current building requirements. When chosen with a short leg, the OW-70 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.
What to do next?
- Find your local installer
Complete the form
- Arrange a consultation with them to discuss your project
- Book a convenient date for them to install
- Enjoy your home's new lease of life
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-80 premium window
OW-70 slimline window
Here at Origin, our vision is to transform the way families enjoy their home - from inside to out…
Explore our case studies
Even Bi-fold sets create a shrine of natural light to illuminate this modern bungalow.
Even Bi-fold sets create a shrine of natural light to illuminate this modern bungalow.Read case study
A renovation with maximising living space and views in mind
The Collins’ have lived in their home for 13 years and decided in 2018 that it was time to renovate and maximise the space and views to the outdoors. The plans were to extend the kitchen which was originally a large patio area, as well as convert the existing conservatory into a functioning room to become Mr Collins’ office.Read case study
Beautiful Oxfordshire Family Home benefitting from Origin's thin sightlines
This beautiful newly built home in Oxfordshire has an incredible amount of sunlight hours, which adds to the appeal to live in this spectacular house. To really make the most of the natural light, the homeowners specified Origin to their local installer, Panoramic Architectural Glazing. The thin sightlines coupled with the ability to create bespoke heights which exceed the industry standard heights, there was no better choice than Origin.Read case study
Origin OB-72 Bi-fold Doors, OW-70 Windows and OS-20 Sliding Doors Complete this Cosy Family Home
A lovely family home has recently been completed with Origin Bi-Folding Doors, OS-20 Sliding Doors and a range of OW-80 Windows.Read case study
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.Read case study