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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. Built from a high-grade aluminium with an impressive 65mm frame, the Origin 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.


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 espag locking mechanism

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 window between the sash and the frame as standard.

Offering a u-Value of up to 1.2.


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 of 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.

Shop OW-70 Windows with Diamond Windows

When searching for double-glazing specialists in the West Midlands, you needn’t look further than Diamond Windows. We’re well equipped in supplying and installing aluminium windows, so please don’t hesitate to 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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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