K-vision Cube
A square-edged K-vision (Kommerling) uPVC window with a straight corner weld — for replacing a timber window in uPVC.
K-vision Cube
uPVC windows are welded at the corners, and an ordinary weld leaves a diagonal seam in the corner. On the K-vision Cube the corner is welded straight, the way a timber window is jointed. With a woodgrain foil it is hard to tell from timber at a distance, which makes it suitable for a house with period character. The profile comes from Kömmerling's K-vision system: 120 mm deep, Uf 1.20 W/m²K, 130 mm sightline and room for 48 mm glass as standard.
26 layouts in K-vision Cube
From a fixed window to a sliding patio door: every layout this profile can do, each with its own page and a direct way into the configurator.
How much does a K-vision Cube uPVC window cost?
What comparable projects cost typically £453 to £534 per unit, excl. UK VAT and import duties The spread is too wide for a single amount; this is the range they fell within. for a unit of 1,000 × 1,400 mm measured on 71 quotes from our own archive This is a guide price, not a quote and not a final price. The amount for your own sizes is in the made-to-measure quote, which you request through the configurator.
The price of a Cube window depends on four things: the overall size, the layout (fixed, tilt and turn, door), the glass and the colour. If there is an amount above this section, it is a guide price from our quote history — not a quote and not a final price; the configurator itself shows no amount. You put your window together, send it as a request, and the price for your sizes is in the offer — you'll hear from us within three working days. Prices in GBP, excl. UK VAT and import duties, which are payable on delivery. Hardware and any discount are in your made-to-measure offer. Delivery to the UK is quoted with your offer. We supply, we don't install, and we don't charge for installation.
Configure and request a quoteK-vision Cube profile — cross-section
The drawing below is the cross-section of our combination, taken from the K-vision Cube profile overview: "76106 + 76201", with frame 81 mm, sash 49 mm, together 130 mm in view at 120 mm depth — the combination that matches our specification table on this page.
Cut from the profile overview of the Cube family: only our combination, frame 76106 with sash 76201 — 130 mm in view, 120 mm deep.
K-vision Cube specifications
| Material | uPVC |
|---|---|
| Uf | 1.20 W/m²K |
| Frame depth | 120 mm |
| Outer frame width | 81 mm |
| Sightline | 130 mm |
| Shape | blok |
| Maximum size | 3,500 × 2,600 mm |
| Maximum sash width | 1,300 mm |
| Size tolerance | ±2 mm up to 1 m, ±3 mm above that |
Move over the drawing to see the dimensions
Uf 1.20 W/m²K is the thermal transmittance of the profile, not of the whole window. What you end up with also depends on the glass (Ug) and on the ratio of profile to glass area; that combination is called Uw and comes out of the configurator, not this table. Further, according to the system data: burglar resistance class 2 with hardware approved under SKG (the Dutch security mark), air tightness 450 to 600 Pa, fire resistance EW30 or EI30 and EW60 on request, colour in proCoverTec or foil, lead-free and fully recyclable. The 120 mm depth decides how far the frame reaches into the reveal — measure it before you order.
This is a schematic cross-section, built from the measured frame depth, frame width and sightline. The chamber layout, seals and reinforcement are not measured — they come from the supplier's technical drawing.
Cube compared with Trend and Gealan S 9000 Slim
Same size, same specification. Only the profile differs.
| Specifications | K-vision Cube | K-vision Trend | Gealan S 9000 Slim |
|---|---|---|---|
| Material | uPVC | uPVC | uPVC |
| Uf | 1.20 | 1.20 | 1.10 |
| Frame depth | 120 mm | 120 mm | 82.5 mm |
| Sightline | 130 mm | 130 mm | 119 mm |
| Maximum size | 3,500 × 2,600 mm | 3,500 × 2,600 mm | 3,200 × 3,200 mm |
| Why something else | Same depth and Uf, but with a recessed sash instead of a square edge. | 119 mm sightline instead of 130 mm, Uf 1.10 instead of 1.20, and 82.5 mm instead of 120 mm deep. |
Side by side, true to scale
The same scale for all three, so what looks deeper here is deeper.
Where does the Cube fit?
New build
Suitable, and the most logical choice in the K-vision range for a crisp, modern elevation.
Renovation
Suitable up to 3,500 × 2,600 mm, and the K-vision to look at if you are replacing timber windows and want to keep the look of timber.
Listed buildings and conservation areas
Talk to your local planning authority first. The straight corner and woodgrain foil come closer to timber than an ordinary uPVC window, but whether that is enough is their decision, especially for a listed building or in a conservation area.
Standards and Building Regulations in the UK
The fitting itself matters as much as the window. The Dutch fitting guidelines for uPVC windows and doors (VKG) come down to what good practice asks anywhere: the opening must allow an airtight, watertight, flat and square joint, and the loads on the window must be carried through fixings into the structure. We supply, we don't install, so this part is your installer's work.
Every window placed on the market in the EU carries CE marking to EN 14351-1: with it the manufacturer declares, on its own authority, that the product meets the essential characteristics in that standard, such as thermal transmittance, air permeability and resistance to wind load. It is a legal obligation, not a test by an independent body — and it is not a UK certification scheme, so we don't present it as one.
In England, Approved Document L sets the limit for replacement windows in an existing home at a U-value of 1.4 W/m²K or WER band B; for doors it is 1.4 W/m²K or DSER band C (more than 60% glazed) or DSER band D (other doors), and a replacement may not perform worse than what it replaces. That U-value is for the whole window (Uw). The Uf on this page is the frame profile alone, so on its own it doesn't tell you whether a window complies; the Uw of your window is stated in your offer. Replacing windows is notifiable building work in England and Wales: an installer registered with a competent person scheme, such as FENSA or Certass, notifies it, or you notify building control before work starts. Because we don't install, that sits with your installer. Scotland and Northern Ireland have their own rules. We don't give Building Regulations advice — check with your installer or building control.
Documents: data sheet
- Rovenzia data sheetPDF · 2 kB
- Rovenzia data sheet K-vision Cube (PDF)not yet available
Know what you want? Put it together.
No form first: you watch your window take shape as you choose. The price follows in the quote, within three working days.
K-vision Cube: frequently asked questions
Can you deliver this profile to me in the UK?
We are a Dutch supplier and deliver to the Netherlands, Belgium, Germany and France. Delivery to the UK is quoted with your offer. Production time for the K-vision Cube is 6 to 8 weeks. You enter your postcode with your quote request. The route always ends at the quote request: not a guessed price, but a quote for your sizes.
What sizes can I order?
This profile goes up to 3,500 mm wide and 2,600 mm high. The widest opening part is 1,300 mm. At the small end: the narrowest section that can be made is 200 mm, the narrowest door section 600 mm, the narrowest side panel next to a door 180 mm, and a door section is no taller than 2,200 mm. **Note: the maximum sizes are not yet confirmed** — our source says so itself, and we confirm them with the supplier before they are final. If you are close to the limit, ask us.
What is the lead time?
Production time is 6 to 8 weeks, the same for all our suppliers (our figure as of 15 September 2026). Delivery to the UK is quoted with your offer. The quote itself is quicker: you'll hear from us within three working days of your request; if it takes longer, you'll hear that within the same three working days, with the date it will be ready.
What exactly will arrive?
What you put together in the configurator is what arrives: the profile you chose, in your size and layout, with the glass and colour you picked. The summary — the last step before your request goes out — lists line by line what your configuration contains, and anything not listed there doesn't come with it. So you know before you unpack, not after. How and where it is delivered in the UK is set out in your offer.
Do you install it as well?
No. We supply, we don't install. That has one consequence you need to know: in England and Wales, replacing windows is **notifiable building work** under the Building Regulations. An installer registered with a competent person scheme, such as FENSA or Certass, notifies it; otherwise you notify building control before work starts. What we don't do is give Building Regulations advice — check with your installer or building control what applies in your situation.
Which glass and colours can I choose?
We offer six types of glass: HR++ double glazing (Ug 1.1), triple glazing (Ug 0.6), satin obscure glass in double and triple, and laminated safety glass class P4A in double (Ug 1.0) and triple (Ug 0.6). For colour there are through-coloured uPVC, dark and other foils for uPVC, and smooth or textured powder coating in a RAL colour for aluminium. Which combination is available on this profile is shown by the configurator — it refuses a combination that doesn't exist rather than quietly supplying it.
Can I send it back if I don't like it?
No. A window made to your measurements is made to order, and made-to-order goods fall outside the right to cancel. We say so before you order, not in the small print. In return, we take the risk out at the start: a size guarantee, a sample pack so you can see the colour in your own light, and a fixed procedure if anything is broken on delivery.
What if something is damaged on delivery?
Check it with the driver before you sign, and have any damage noted on the delivery note. Until the window is in your hands, damage in transit is **our risk**, not yours — we ship on DAP terms, so the risk stays with us until delivery. If you still find visible damage when you unpack, report it with photos **within two working days of delivery**. What you can't see on delivery isn't covered by that: for hidden defects your statutory rights apply unchanged.
Why is the corner of the Cube straight?
Because the profiles are welded straight onto each other at the corner instead of mitred at 45°. A timber window is jointed the same way, which is why a Cube with woodgrain foil looks like timber at a distance.
Is the K-vision Cube a Kommerling profile?
K-vision comes from the profile range of profine, the group that Kömmerling (often written Kommerling in the UK) belongs to; that is why you also find it as "Kommerling K-vision". The window itself is made by a fabricator who processes the profiles.
Configure your window or door in K-vision Cube
Where we have a guide price, it is on the page, not behind a form — not a quote and not a final price; the amount for your sizes is in the made-to-measure quote.
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