Every developer who has ever requested two quotations in parallel has hit the same wall: the European system house comes back at one number, the Chinese factory at another, and the gap is wide enough that nobody believes both can be describing the same product. The honest answer is that “China versus Europe” stopped being a quality question several years ago. It is now a question about specification control, documentation, and who absorbs the risk when something goes wrong on site.
Most online comparisons start from a false premise: that a window made in Guangdong and a window made in Bavaria are two different species of object. They are not. Both are extruded aluminium profiles, thermally separated by a polyamide strip, fitted with multi-point hardware, and glazed with an insulated unit. The variables that actually separate a 15-year window from a 40-year window are not national; they are alloy temper, insulation strip width, wall thickness, sealing architecture, and hardware origin.
Once you accept that, the purchase decision becomes far more tractable. You stop asking “which country?” and start asking “which specification, verified by which test report, backed by which warranty?”
Unit price per square metre is the least useful number on the quotation. A serious value model has five line items:
When you lay the two options side by side on those five lines rather than on price alone, the answer frequently flips. This is why some very experienced builders pay a premium for European systems, and why an equally experienced group quietly imports from China and reinvests the difference in better glazing.
Three of the four components that determine how a window performs are globally sourced commodities, and a well-run Chinese factory buys them from the same vendors a European fabricator does.
European system houses specify 6060-T66 for precisely the same reason ALPES does on its casement window supplier line: the T66 temper gives higher yield strength than the T5 temper commonly used for general extrusion, which matters when you are pushing larger sash sizes. If a quotation says 6063-T5 on a two-metre-wide sash, that is the specification to challenge — not the country of origin.
PA66GF25 — polyamide 66 reinforced with 25% glass fibre — is the material European systems use, and it is the standard across ALPES windows. What changes performance is not the material name but the geometry: how many chambers the strip has, how wide it is, and whether the glass centreline, the insulation strip, and the equal-pressure seal sit on the same isothermal axis. On the C116 series the insulation strips run 34mm to 44mm in a multi-chamber configuration; on the AW90 passive window the strip is supplemented by an insulation sponge and a dual-matrix eight-layer sealing system, which is how that unit reaches a K-value of 1.3.
This is the point most buyers miss. ROTO, Winkhaus and Wehag are German companies. When ALPES fits a Winkhaus full hardware set on the AW90 or a ROTO transmission box with anti-pry lock points on the C120, the component is the same component a German fabricator screws into his profile. Buyers who search for german tilt and turn windows are often surprised to learn that the hardware they associate with European quality is already inside a China-built system — because it is the same supply chain.
The practical consequence: if you want German hardware, specify it by brand and model in the contract. If you do not, you will get whatever the factory defaults to, in either country.
Instead of arguing about origin, send both the European and the Chinese supplier this list and compare the answers in writing. The right-hand column shows what ALPES returns, so you have a benchmark for what “good” looks like.
| What to ask | Why it matters | ALPES reference |
|---|---|---|
| Alloy and temper | Determines sash size limits and long-term deflection | 6060-T66 across the range |
| Profile wall thickness | Thin walls save money and cost you wind-load capacity | 1.8mm windows; 2.0–2.5mm doors, locally reinforced to 3.0mm |
| Thermal break material and width | Drives condensation risk at the frame edge | PA66GF25, multi-chamber, 34–44mm on C116 |
| Whole-window K-value | The single number that predicts your energy bill | 1.3 (AW90), 1.6 (C120), 1.7 (C116) |
| Hardware brand, by name | Spare parts availability in year ten depends on it | ROTO, Winkhaus, CMECH, Wehag |
| Cycle test result | Separates marketing from engineering | CMECH hardware tested to 30,000 cycles |
| Corrosion test | Non-negotiable for coastal and poolside projects | 240-hour salt spray resistance on AW90 |
| Structural test data | Evidence the corner joints hold under load | 5,000N shear resistance on AW90 |
Any supplier — European or Chinese — that cannot answer at least six of these eight lines with a number rather than an adjective is telling you something about their engineering department.
Being fair matters, because a comparison article that pretends otherwise is not useful to anyone.
Notice that three of those four are about process and proximity, not about the physical window. That distinction is the whole argument.
European systems are engineered around a catalogue. Step outside it and the premium escalates quickly. A factory that extrudes and fabricates in-house treats 2.8m by 2.6m as a production instruction rather than an exception. The SL155 thermal break sliding door carries a single sash up to 2800mm wide and 2600mm high — roughly 7.5 square metres of opening — on a 20-wheel self-balancing pulley rated to 400kg. The SL126/182 series goes to 2.5m by 3.0m. If your architect has drawn a panoramic corner, this is the difference between the design being built and the design being value-engineered away.
Windows, sliding doors, lift-and-slide units and sunrooms from a single production centre means one colour batch, one hardware platform, one set of shop drawings, and one phone number when something needs resolving. ALPES runs 100,000 square metres of production across Foshan and Zhaoqing, which is the cluster where the extrusion, coating, hardware and glass supply chains sit within a short trucking distance of one another. That density — not labour rates — is where the cost advantage actually comes from.
The meaningful comparison is not “European window versus Chinese window at equal price.” It is “what specification can I afford with a fixed budget?” Very often the answer is: a wider insulation strip, a deeper frame, triple glazing, and German hardware from one source — or a base-level system from the other. For a project where the performance target is written into the design brief, that trade is decisive.
This is also why it pays to treat the door package as part of the same decision rather than a separate procurement. A sliding glass door manufacturer that fabricates its own profiles can match the frame finish and sightline of the windows exactly, which is the detail that separates a coherent elevation from a patched-together one.
Importing is not the risk. Importing without a process is. Every serious buyer who sources from Asia and sleeps well at night does these five things:
| Project type | Better value | Reason |
|---|---|---|
| Luxury villa with oversized openings | Factory-direct | Custom sizes and panoramic panels are catalogue exceptions in Europe and routine production in China |
| Multi-unit development, 50+ identical units | Factory-direct | Repetition is where factory efficiency compounds; the saving per unit multiplies by the unit count |
| Coastal or high-salt environment | Either, if tested | Ask for the salt spray hours in writing — 240 hours on AW90 — and specify stainless mesh |
| Cold-climate or low-energy build | Either, if tested | Whole-window K-value of 1.3 or below is the target; origin is irrelevant to the physics |
| Tight programme, no float in the schedule | Depends | Europe wins on replacement speed; factory-direct wins on production capacity for custom work |
| Project requiring stamped local submittals | European system house | Ready-made documentation packages save consultant time and approval cycles |
At the top end of the Chinese export sector, the materials and hardware are the same: 6060-T66 profiles, PA66GF25 thermal breaks, ROTO or Winkhaus hardware, tempered insulated glass. The variable is the individual factory. Judge the specific supplier on test data and a sample unit, not the flag on the quotation.
Ask for the whole-window value, not the glass value, and ask which standard was used to calculate it. A K-value around 1.3, as achieved by the AW90 passive window, suits low-energy and cold-climate work; 1.6 to 1.7 is a solid result for a standard residential casement such as the C120 or C116.
Yes, and you should ask for it explicitly. ALPES fits Winkhaus sets on the AW90, ROTO transmission boxes and anti-pry lock points on the C120, Wehag hardware on the C116, and CMECH hardware tested to 30,000 cycles on the C113. Name the brand in your purchase order.
Specify the packing method in the contract: individual protection per unit, corner guards, plywood crating rather than carton, and a documented loading plan. Insist on photographs of the loaded container before it is sealed.
Get the warranty terms in writing before deposit, including what voids them. Then order a spares kit with the original shipment so that a damaged roller or handle does not wait for the next production run.
If airtightness matters, yes. The tilt-and-turn format locks against a compression seal on all four sides rather than sliding past a brush seal, which is why the AW90 reaches a K-value of 1.3 with eight sealing layers and perimeter locking points. It also gives you secure night ventilation, which a casement cannot.
Do not decide on origin. Decide on evidence. Send your window schedule to both a European system house and a vetted factory, require both to answer the eight-line specification table in writing, and order one sample from each. Put the two samples on a table, open and close them, look at the welds, and read the test reports. The better value will be obvious within an afternoon — and it will not always come from the same side of the world.
ALPES builds system windows and doors to that standard — 6060-T66 profiles, PA66GF25 multi-chamber thermal breaks, German hardware, and documented test data — from 100,000 square metres of production in Foshan and Zhaoqing, for villa and commercial projects across the Middle East, Australia and beyond. Send us your schedule and the specification you have been quoted elsewhere. We will return a like-for-like comparison you can put in front of your consultant.
