Reynaers ConceptSystem 77
Reynaers aluminium windows, also with a concealed sash: Uf 1.76 to 2.05 W/m²K in the HI version.
Reynaers ConceptSystem 77
ConceptSystem 77 comes in three styles: Functional (68 mm frame / 77 mm sash), Renaissance (77 / 86 mm) and Hidden Vent, where the sash disappears completely behind the frame for a clean, flat face. In the HI version the Uf is between 1.76 and 2.05 W/m²K; the standard version is higher. Sightlines: 51 mm outer frame and 33 mm sash, 89 mm together on an inward-opening window and 93.5 mm outward-opening; a T-section (mullion or transom) is 76 mm wide. Tested to burglar resistance class RC2 and RC3, with glass up to 53 mm thick.
Detail drawings
The manufacturer's drawings, for each version of this profile. They are on the page itself; you can download the PDF below.
Fixed light
Glass held in the frame by a glazing bead, 64 mm of profile in view. For a fixed pane next to a door, a top light or a window that doesn't need to open.
frame 68 mm deep · sightline 64 mm · glass 4-20-4
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Tilt and turn window
Turn it in to clean the outside, tilt it to ventilate. Frame and sash together 115 mm in view, on a 68 mm frame depth.
sightline frame + sash 115 mm (64 + 5 + 46) · frame 68 mm deep · glass 4-20-4
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Door
Front door, back door or garden door on the same system, opening inwards or outwards.
sightline frame + sash 115 mm (64 + 5 + 46) · frame 68 mm deep · glass 4-20-4
Request my quote26 layouts in Reynaers ConceptSystem 77
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 Reynaers ConceptSystem 77 window cost?
Our guide prices come from our own quote history, and this type has not come up in it for this profile. That is why there is no amount. Just request the quote: we work it out on your own sizes.
The price of a CS 77 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 quote — you'll hear from us within three working days. Prices in GBP, excl. UK VAT and import duties, which are payable on delivery. Delivery to the UK is quoted with your offer; hardware and any discount are itemised in the same quote. We supply, we don't install, so there is no fitting cost in it and we don't pass one on.
Configure and request a quoteReynaers ConceptSystem 77 cross-section — fixed light and tilt and turn window
The drawings show the system to scale, from outside (left) to inside (right): on the left the outer frame with a fixed light, on the right the frame and a tilt and turn sash side by side. The three hatched chambers between the outer and inner shell are the thermal zone; the 68 mm is the frame depth. The glass in the drawing is 4-20-4, the lightest double glazing; triple glazing fits too, with a different glazing bead.
The glass is held in frame 0083183 by a glazing bead. This frame has a rebate; Reynaers' profile poster also lists a fixed-light frame without one (008.0036, 52.8 mm), which we haven't drawn here. The three hatched chambers between the outer and inner shell are the thermal zone.
Horizontal section through the hinge side: frame 0083183 with sash 0083192 inside it, 115 mm of sightline together. The 5 mm between them is the gap; the gasket sits on the frame's rebate.
Reynaers ConceptSystem 77 specifications
| Material | Aluminium |
|---|---|
| Uf | 1.76 W/m²K |
| Frame depth | 68 mm |
| Outer frame width | |
| Sightline | 89 mm |
| Maximum size | × 3,000 mm |
| Maximum sash width | 1,700 mm |
| Size tolerance | ±2 mm up to 1 m, ±3 mm above that |
Move over the drawing to see the dimensions
The card shows Uf 1.76 W/m²K — the lower end of the HI version (1.76 to 2.05; the standard version is higher), 68 mm frame depth (the outer frame; the sash is 77 mm) and 89 mm sightline (frame and sash together, inward-opening; outward-opening 93.5 mm). Figures from the Reynaers system data, supplied to us on 14 September 2026. The Uf a particular window achieves depends on the style chosen and the glass thickness. Uf is the profile alone, not the whole-window U-value that Building Regulations ask for.
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.
The CS 77 compared
Same size, same specification. Only the profile differs.
| Specifications | Reynaers ConceptSystem 77 | Aluprof MB-86N | Reynaers MasterLine 8 |
|---|---|---|---|
| Material | Aluminium | Aluminium | Aluminium |
| Uf | 1.76 | 0.57 | 1.20 |
| Frame depth | 68 mm | 77 mm | 77 mm |
| Sightline | 89 mm | 122 mm | 97 mm |
| Maximum size | × 3,000 mm | 6,000 × 3,000 mm | × 3,000 mm |
| Why something else | Aluminium window and door profile with a Uf of 0.57 W/m²K for the whole profile and 77 mm frame depth — the same depth as the Renaissance style of the CS 77, but with a documented maximum size of 6,000 × 3,000 mm, where the CS 77 has none in our table. | Same manufacturer, and at 77 mm frame depth equal to the Renaissance style of the CS 77, but it insulates better: Uf from 1.2 W/m²K against 1.76 for the CS 77 in the HI version. |
Side by side, true to scale
The same scale for all three, so what looks deeper here is deeper.
Where is the CS 77 a good fit?
New build
Suitable. Aluminium is the usual choice once the opening gets larger than uPVC can handle.
Renovation
Suitable.
Listed buildings and conservation areas
Ask your local planning authority first. Aluminium with a slim sightline is sometimes accepted where uPVC is not.
Standards and Building Regulations in the UK
We supply, we don't install, so fitting is your installer's work. In the Netherlands, where we are based, the VKG fitting guidelines for uPVC windows and doors and the KVT guidelines for joinery sit side by side. Both come down to what good practice asks anywhere: the opening has to allow an airtight, watertight, flat and square joint, and the loads on the window have to be carried into the structure through its fixings. Replacing windows in England and Wales is notifiable building work: an installer registered with a competent person scheme (FENSA or Certass, for example) notifies it, or you notify building control before the work starts. Because we don't fit, this sits with your installer — agree it before you order.
Every window placed on the market in the EU carries a CE marking to EN 14351-1: with it, the manufacturer declares that the product meets the essential characteristics in that standard, such as thermal transmittance, air permeability and wind resistance. It is a legal obligation for the manufacturer, not an inspection by an independent body, and on its own it says nothing about UK Building Regulations.
On energy performance: in England, Approved Document L (Volume 1: Dwellings, 2021 edition) requires a replacement window in an existing home to reach a U-value of 1.4 W/m²K or Window Energy Rating band B. For a door that is more than 60% glass the limit is 1.4 W/m²K or DSER band C; for other doors 1.4 W/m²K or DSER band D. 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 profile alone and the Ug is the glass alone — neither is the figure Part L asks for. The Uw of your window, at your sizes and with your glass, is stated in your offer. Scotland and Northern Ireland have their own rules.
Documents: data sheet, brochure, profile poster
- Rovenzia data sheetPDF · 2 kB
- Rovenzia data sheet Reynaers ConceptSystem 77 (PDF)not yet available
More documents from Reynaers
Reynaers' own documents. We link to them rather than copying them, so you always see the version the manufacturer currently publishes.
- ConceptSystem 77 brochure (PDF)webpagina
- ConceptSystem 77 profile poster — every frame and sash profile with dimensions (PDF)webpagina
Reynaers provides the DWG files through the same download page; they are for the fabricator, not for this page.
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.
Frequently asked questions about the Reynaers ConceptSystem 77
Can you deliver this profile to the UK?
Delivery to the UK is quoted with your offer. Reynaers ConceptSystem 77 is made to order; production time is 6 to 8 weeks. You enter your postcode when you request a quote. The route always ends with a quote request: no guesswork price, but a quote for your sizes. For this profile that applies in any case: there is no automatic price yet, so your request always goes to the manufacturer for a made-to-measure quote.
What sizes can I order?
Reynaers sets the limits per sash, not per window: a window sash up to 2,800 mm high and 170 kg, a door leaf up to 3,000 mm high and 1,400 mm wide at 250 kg (Reynaers, reynaers.com, 15 September 2026). The widest opening part in our table is therefore 1,400 mm. Reynaers gives no maximum width or height for the complete assembled window — that is still open. The configurator keeps to the sash limit; for a large window, ask us to check the size.
How long does it take?
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 I receive?
What you put together in the configurator is what you get: the profile you chose, in your size and layout, with the glass and colour you picked for it. The summary — the last step before your request goes out — lists line by line what is in your order, and anything not listed there isn't included. 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 about: replacing windows in England and Wales is notifiable building work. An installer registered with a **competent person scheme** (FENSA or Certass, for example) notifies it for you; otherwise you notify building control before the work starts. Because we don't fit, this is down to your installer — agree it with them before you order. Scotland and Northern Ireland have their own rules.
Which glass and colours can I choose?
We stock six types of glass: HR++ double glazing (Ug 1.1), triple glazing (HR+++, Ug 0.6), obscure glass in double and triple, and P4A laminated safety glass in double (Ug 1.0) and triple (Ug 0.6). For colour there are solid core colours, dark and other foils for uPVC, and smooth or textured powder coating in RAL colours for aluminium. Which combination is available on this particular profile, the configurator tells you — it refuses a combination that doesn't exist rather than quietly supplying it.
Can I send it back if I change my mind?
No. A window built to your measurements is made to measure, and made-to-measure goods fall outside the right to cancel. We tell you that 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 something is damaged 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, transport damage is **our risk**, not yours. If you still find visible damage when you unpack, report it with photos **within two working days of delivery**. That doesn't cover what you *couldn't* see on delivery: for hidden defects your normal statutory rights on faulty goods apply.
Configure your window or door in Reynaers ConceptSystem 77
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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