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Origin OW-70 Windows

The Origin Slimline Window (OW-70) is designed for spaces where maximising glass and light is essential. The OW-70 is one of the most elegant slimline aluminium windows on the UK market. Manufactured from high-grade aluminium with a graceful 65mm frame, the Origin Aluminium Slimline Window is as strong as it is sleek. Its ultra-slim sightlines will not only deliver aesthetically, but its innate strength will ensure your home is kept secure.

Our aluminium casement window styles are a popular choice for homeowners because of their classic, chic appearance and ‘A’ energy rating, ensuring your home retains heat, saves you money, and looks good doing it.

Origin OW-70 Window



  • Outer Frame Depth 70mm
  • Sash Depth 64mm
  • Mullion and Sash Sightline 80mm
  • Square or chamfered bead option
  • External flush casement
  • Mechanically double crimped corners
  • Nemesis espagnolette locking mechanism
  • Offering a u-Value of up to 1.2.

In order to improve thermal efficiency, the OW-70 is fitted with a 32mm polyamide thermal break and a bespoke cavity gasket in the internal chamber of the aluminium window between the sash and the frame as standard.



The OW-70 has been designed with security in mind. Being PAS 24:2016 and Secured by Design accredited, you can be ensured that despite its slim nature, it still possesses components of the highest quality to ensure its security.

The hinge guards feature anti-slip and lock technology and are fitted as standard along the hinged side of the window.

The bespoke Nemesis lock, which sits inside the sash, features a robust offset-handed die-cast gearbox and bi-directional twin cam locking. It also corporates stainless steel faceplate drive bars and mushroom cams to enhance both its appearance and longevity.


  • Top Hung Max Height (mm): 1474mm
  • Top Hung Max Width (mm): 1374mm
  • Side Hung Max Height (mm): 1400mm
  • Side Hung Max Width (mm): 950mm

Relax, Origin has you covered

Our Origin Slimline Aluminium windows are covered by a 20-year manufacturer guarantee, so you can relax knowing that your windows will last for years to come.

Alternative Shades

Our collection of Origin OW-70 windows can come in up to 150 RAL colours and modifiable designs. In order to give it a flawless finish, the highest-grade powder coating is applied to the aluminium; with a durable yet smooth finish, it offers the benefit of being highly resilient to the elements.


10 Year Guarantee

All our double-glazed casement windows are easy to maintain and keep looking like new, partly due to their durability and longevity. We’re so confident in our windows that we offer a ten-year guarantee as standard.

Are you searching for replacement windows or double glazing near me?

When searching for double-glazing specialists in Droitwich, look no further than Diamond Windows. We are one of the region’s most experienced suppliers and installers of slimline aluminium windows. Get in touch regarding your aluminium window needs. Our expert team will be more than happy to advise you about our OW-70 window range or any other window types.

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“Very pleased with work carried out. Approachable staff very pleasant.”

“The Diamond Window guys installed our new front door and sidescreen and did a fantastic job. They were highly skilled and also very tidy. I would use them again”

Trust our 5-Star Reviews

“Excellent selection, first class advice and outstanding fitting. We wouldn't go anywhere else for double gazing projects.”

“From design to completion , excellent service,friendly and competent tradesmen.”

Contact us
Diamond Windows, Unit 22, Northstreet I.E, Droitwich,West Midlands, WR9 8JB
Company Reg: 5367399
Open Hours
Mon to Fri: 9am to 4.30pm
Sat: 9am-1pm
Sun: By appointment