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Origin Doors

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.

  • Made in Britain

    Proudly manufactured in the United Kingdom at our Buckinghamshire facility.

  • Up to a 20 year guarantee

    Discover our industry leading guarantees for complete peace of mind.

  • Thermal performance

    Our doors help your house stay warm in winter and cool in the summer.

  • Police backed security

    We’re committed to your safety through compliance and accreditation initiatives.

  • 150 RAL colours

    A wide range of colour and finish options ensures that there is a style to suit your home.

  • Unbeatable lead times

    Find out how our unbeatable delivery promises can help your project.

  • Bespoke

    All Origin products are tailor-made to your requirements by our higly skilled team.

  • Premium quality aluminium

    Find out how our doors benefit from the strength, resilience and versatility of our premium grade aluminium.

  • Low maintenance

    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.

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
  • Satin GreySatin Grey
  • 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

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. Please note - your windows will be delivered to your chosen Partner and the install will be based on glass and their installation availability.

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 height1,400mm1,474mm
Max width
Max width950mm1,374mm
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.

Police backed security

Tested to some of the highest standards, the thermal efficiency exceeds current building regulations, is Secured By Design and PAS 24 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.

Police backed security

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?

  1. Find your local installer
    Complete the form
  2. Arrange a consultation with them to discuss your project
  3. Book a convenient date for them to install
  4. 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-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

  • This detached mid-century home has been transformed by a full make over of Origin products

    This detached mid-century home has been transformed by a full make over of Origin products

    The Family Home now has a modern oasis through an incredible makeover featuring Origin products.

    Read case study
  • House renovation aided by Origin’s slimline range

    House renovation aided by Origin’s slimline range

    Having moved in the property in 2021, Dan wanted to refurbish the whole property to create a fresh and new start. From windows, doors to floor plans; the project was a full renovation.

    Read case study
  • Windows and Doors add to the uniqueness of this wonderfully designed house

    Windows and Doors add to the uniqueness of this wonderfully designed house

    Discover the exquisite charm of this beautifully designed house, where every window and door tells a story.

    Read case study
  • Traditional thatched cottage with a modern Origin twist

    Traditional thatched cottage with a modern Origin twist

    Step into a world where tradition meets innovation at this charming thatched cottage. Experience the modern Origin twist first-hand.

    Read case study
  • 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.

    Even Bi-fold sets create a shrine of natural light to illuminate this modern bungalow.

    Read case study
  • Beautiful Oxfordshire Family Home benefitting from Origin's thin sightlines

    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

    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

    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