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Diamond Windows are registered FENSA installers

We adhere to a strict code of quality. We notify FENSA whenever an installation has been completed.

VS600 windows perfectly tread the balance between contemporary thermal aluminium profiles and traditional sash windows. These traditional sash windows are typically installed in areas of conservation and heritage, as Victorian and Georgian architecture is widespread. The windows are easily operated, and their ventilation rates make them ideal for high-occupancy properties. This even applies to hospitals and schools since the flush opening means that windows can be opened with no interior or exterior projections.

The hardware of VS600 windows has been intricately designed, meaning that there is a tilt-in option, which enables exterior glass cleaning. Similarly, the system boasts a low line glazing gasket, which accepts 28 mm sealed units. As a result, the system is capable of reaching U Values of 1.6W/m2K, as well as a W.E.R.C rating.

Furthermore, these windows are equipped with a concealed coupling option and drainage. The convenience doesn’t end there, as the assembly is made incredibly simple, thanks to the sash joints and square-cut outer frame. Thankfully, these require only a small amount of machining to aid fabrication.

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.


Brand: VS
NBS Available: Yes
Thermally Broken: Yes
Material: Aluminium Polyamide


BS 6375-1:2009: Yes
Document L Compliant: Yes
U Value: 1.6W/m²K (using correct glass unit)
WER Rating: C


Vertical Sliding Max Height (mm): 2800mm (based on frame width 750mm)
Vertical Sliding Max Width (mm): 1600mm (based on frame height 1300mm)
Vertical Sliding Max Weight (kg): 50kg (per sash)
Frame Depth (mm): 126mm
Glazing (mm): 28mm


As previously mentioned, VS600 windows can be applied in various environments, including areas of conservation and heritage, hospitals, and schools. Despite this, VS600 windows aren’t exclusively for application in these environments and can be installed in all manner of properties.


We offer VS600 windows in a multitude of finishes. This refers to your desired glazing finish, whereby you can choose between diamond or square lead work. From ornate solutions to simple replacements, the VS600 range is ideal for any property in need of sprucing. Be sure to browse our collection to find the right window for you with the best finish.



Anthracite Grey

Alternative Styles

The beauty of Aluminium is that it's available in any single or dual RAL colour

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 VS600 Vertical Slider with Diamond Windows

As some of the most experienced double-glazing specialists across the West Midlands, we’re sure to find you the ideal window solution. Get in touch to discover more about of VS600 Vertical Slider collection, installation services, or any other products. We look forward to hearing from you.

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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