When PVC reaches its limits, aluminium takes over. Its rigidity carries bays several metres wide and shapes no one else will make: arches, full arches, attic trapezoids, oculi, glass roofs, frameless corner glazing. Any size, any RAL, special glazing — built to your exact measurements.
Custom-made is not a sales pitch: it means genuinely achievable dimensions, shapes and finishes. Here is what the rigidity of aluminium allows, fitted by our teams.
The rigidity of the aluminium profile carries very large glazed surfaces without heavy reinforcement. Sliding units several metres wide, full-height windows, glazed facades: dimensions PVC cannot bear without bulking up.
Arch, full arch, attic trapezoid, oculus, triangle, pentagon: aluminium bends and cuts to shape. Every unusual opening finds its joinery, where the standard range offers nothing.
Two bays meeting at a corner with no intermediate post: an all-glass effect impossible without the rigidity of aluminium. The signature of contemporary living rooms opening onto the garden.
Triple glazing, enhanced acoustic, solar control, frosted, burglar-resistant: a custom build integrates the right glazing for each room and each orientation.
The full RAL range in matt, satin or textured, plus two-tone (one colour inside, another outside). The finish is chosen room by room, with no batch surcharge.
Dimensions taken during the free survey, fabrication to the exact size, fitting fine-tuned: no unsightly filler, no add-on profiles. The frame hugs the opening, whether new-build or renovation.
* Indicative capabilities for thermally broken aluminium ranges. Maximum dimensions and shapes depend on the profile, the glazing and the orientation — confirmed during the survey.
Custom aluminium is unbeatable on some projects, less relevant on others. Here, honestly, is where it shines and where another route is better.
It becomes the right choice as soon as the opening falls outside the standard — by size, shape or architectural role. A few typical cases:
Studio-style glass roofs, full-height facades, verandas: the rigidity of aluminium structures large glazed surfaces with slim, regular mullions.
Trapezoids under sloping roofs, arches, oculi, triangles: the openings the standard range ignores are built here to the exact shape of the structure.
Sliding units several metres wide and frameless corner glazing: the all-glass effect onto the garden, reserved for aluminium.
For standard-sized windows built to measure, custom PVC offers a better price/insulation ratio. And to understand the approach, the survey and the grants across all materials, see custom windows in overview.
The owner wanted to open up a previously blank attic gable with its trapezoidal sloping lines. No standard window fitted the shape. We designed and custom-built an anthracite, thermally broken aluminium assembly: two trapezoids and a large central bay, fitted to the millimetre on the existing masonry.
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Custom aluminium wins on dimensions, shapes and corner glazing. Compare it with custom PVC and the general custom approach, then open the page that concerns you.
| Critère | Custom aluminiumVous êtes ici | Custom PVCVoir la gamme → | Custom (overview)Voir la gamme → |
|---|---|---|---|
| Indicative price | €€€€ — one-off | The gentlest | Depends on material |
| Very large dimensions | Ideal | Limited | Depends on material |
| Special shapes | All | Common ones | Subject to feasibility |
| Frameless corner glazing | Yes | No | Aluminium only |
| Thermal insulation | Very good (thermal break) | Excellent, natural | Depends on material |
| Colours & finishes | Any RAL, two-tone | 40+ colours | Variable |
| Ideal for | XXL bays, shapes, design | Common sizes, budget | Understanding the process |
The full aluminium range: slim profiles, thermal break, large bays and contemporary style.
See the aluminium range →The custom approach explained — survey, made-to-measure fabrication, grants — whatever material you choose.
Understand custom windows →The full RAL range in matt, satin or textured, plus two-tone: choose the colour of your custom windows.
Choose a colour →Aluminium excels at large sliders: low threshold, large leaves and maximum glazed area.
See the sliding doors →Fitted price ranges by dimensions, shapes, glazing and finish. And the share covered by grants.
See aluminium prices →An overview of our windows & joinery in Belgium: materials, glazing, fitting and grants on a single page.
Back to the windows guide →Custom work is priced per unit: dimensions, shape, glazing and finish weigh more than on a standard range. Here are some benchmarks for aluminium built to measure and fitted.
See the detailed aluminium price list →* Indicative ranges per fitted custom aluminium unit, excluding very specific shapes. A costed estimate is provided with your free quote, after the survey.
Almost any: arch, full arch, attic trapezoid, oculus, triangle, pentagon, as well as frameless corner glazing. The rigidity of aluminium lets us bend and cut the profile to the exact shape of the opening, where no standard window fits.
Very large dimensions, often up to several metres per bay depending on the profile and glazing. The rigidity of the metal carries sliders and full-height windows that PVC cannot bear without bulking up or being heavily reinforced. The maximum size is confirmed during the survey.
A unit built to measure, especially in a special shape, costs more than a standard window. But it avoids any unsightly filler and fits the structure perfectly. On an unusual opening, custom is often the only clean, durable solution.
Longer than a standard range, as each unit is built to your dimensions after the survey. Allow several weeks of fabrication in general, more for complex shapes or large glazed assemblies. The exact lead time is confirmed in your quote.
Yes. The full RAL range is available in matt, satin or textured finish, and even two-tone — one colour inside, another outside. Anthracite and black remain the most requested for their contemporary look, but the choice is free, unit by unit.
Yes, exactly like a standard window. Grants depend on the performance achieved (Uw coefficient), not on being custom-made. High-performance aluminium qualifies, depending on your region and income, for a renovation grant and 6% VAT on homes over ten years old. We handle the paperwork for you.
Free home survey, shapes and dimensions measured to the millimetre, grants calculated. Describe your project in under a minute.