Colours.
Choose from around 250 full-strength and special effect colours meeting the top Qualicoat Seaside standard from our own powder-coating facility.
- Maximum design elegance, uncompromising insulation.
Aluminium windows reinvented.
How much aluminium would you like? On the exterior only, interior only or both?
Finstral windows are always designed for modularity. The materials on the frame interior and exterior are freely selectable: aluminium, uPVC or wood. Regardless of shape or other details.
FIN-Window Slim-line aluminium-aluminium window, single-sash version, colour F716 Anthracite Grey, handle series 12, 43 Stainless Steel.
FIN-Window Slim-line window, single-sash version, aluminium on exterior, colour F716 Anthracite Grey, uPVC on interior, colour 45 White satin finish, handle series 12, 43 Stainless Steel.
FIN-Window Slim-line window, single-sash version, uPVC on exterior, colour 45 White satin finish, aluminium on interior, colour F716 Anthracite Grey, handle series 12, 43 Stainless Steel.
FIN-Window Slim-line window, single-sash version, aluminium on exterior, colour F716 Anthracite Grey, wood on interior, colour 2X01 Natural Oak, handle series 12, 43 Stainless Steel.
Everything is combinable with everything else.
All features are compatible with all others and with any design concept.
We at Finstral offer Europe’s most exhaustive range of windows. Countless options are available for you to compose your very own dream window.
Frame shapes.
From traditional frames or industrial-loft-style sashes to minimalist profiles – we can meet all your aesthetic and functional requirements.
Handles.
Single out the perfect handle from a wide assortment of colours, designs with round or oval rose and security features.
Style elements.
Use glazing bars, infill panels and exterior windowsills to closely tailor your windows to the particular style of your home.
Security options.
Our security standards? Are the highest. We offer various solutions, e.g. full-perimeter security hardware, lockable handles and safety glass, for enhanced burglary protection.
Solar protection.
There is a host of solar protection options on offer – from traditional hinged shutters and solar protection glazing to interstitial shading devices.
First-rate insulation values.
A uPVC core for unbeatable insulation.
Finstral even uses uPVC in making its aluminium windows – at least for the frame core. Hence the effortless achievement of outstanding thermal and sound insulation values – of up to Uw 0.77 W/m2K and Rw 47. Which are remarkably good for aluminium windows.
We systematically reduce the carbon footprint of our aluminium.
Single-minded resource efficiency.
The use of secondary material for our aluminium frame facings enables us to cut greenhouse gas emissions by up to 95% compared to the equivalent figure for primary aluminium (source: International Aluminium Institute). In 2025, our exterior and interior facings contained an average of 68% recycled aluminium. Quite apart from this, Finstral always keeps an eye on the efficient use of resources when designing its aluminium windows:
- The frame’s uPVC core likewise incorporates an average 20 % secondary material.
- To facilitate single-material separability for recycling, the design dispenses with the thermal break strips or composite materials commonly encountered in aluminium windows.
- The overall proportion of high-embodied-energy aluminium in the window frame is kept to a minimum by maximising the amount of uPVC in the core.
- The steel reinforcement needed for the frames is reduced by around two-thirds by bonding the glass to the sash frame instead of simply setting it on blocks.
Experience aluminium windows first-hand.
The best way to experience the beauty and superior feel of aluminium windows is to visit a Finstral Studio.
Perfection starts at the design stage.
Windows are investments for decades. Which makes intelligent design all the more important. The diversity of design and functional options is far greater than you can imagine.
Create custom compositions.
Our large selection of modular, combinable shapes, materials and colours offers you virtually limitless potential.
Seek advice.
Our experts are always there to help. For an initial discussion, a home visit or a professional consulting session at our Studio.
Craft your own design.
Online using the Finstral Planner or with our detailed and exhaustive window catalogue.
Your design forms the basis for our advice.
The appeal of aluminium windows transcends borders.
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New villa in the Swiss countryside
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New single-family house in Wijhe
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Renovierte Wohnung in Valencia
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Modern single-family house in Marsala
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FIN-Project Slim-line 78/88
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Villa in Turnhout
At a glance.
Aluminium windows reimagined.
Standard aluminium windows incorporate metal profiles with a simple thermal break, which may result in thermal bridging. Finstral adopts a different approach: our aluminium windows comprise high-quality aluminium on the interior and exterior, which encloses a highly insulating uPVC core. This has the advantage of combining the stylish look, pleasant feel and long service life of solid aluminium with the outstanding thermal insulation of a uPVC window. Corner welding of the core also vouches for a permanently airtight and watertight seal.
FAQ
What advantages do Finstral’s aluminium windows offer over conventional aluminium windows?
The core of standard aluminium windows is also made of aluminium, which is a good thermal conductor. A rigid polyamide strip is thus incorporated as a thermal break. This, however, reduces the window’s durability. Finstral’s aluminium windows, by contrast, have a highly insulating uPVC core onto which an aluminium facing is clipped on the interior and exterior. For durable and exceptionally well-insulating windows.
How are aluminium windows installed?
Aluminium windows can be fitted using minimally invasive methods, e.g. by means of slide-in installation, which involves no noise, dirt or scaffolding and takes around one hour per window. Here, the sashes, hardware and gaskets are removed from the existing frame and the new frame is slid into place. Installation with the FIN-Fix mounting frame is recommended for new-build contracts. This is incorporated during the wet construction phase. The window itself is then fitted during the dry construction phase, i.e. after all the “messy” operations have been completed. This virtually eliminates any risk of damage.
How do I clean aluminium windows?
The powder-coated finishes are highly weather-resistant and dirt-repellent – water and dirt simply bead off. Cleaning with water suffices.
Does condensation form on aluminium windows?
Though often the case with old aluminium windows, this does not normally happen with Finstral’s aluminium windows. The insulating uPVC core and the thermally insulated glass spacers fitted as standard prevent the frame from cooling down on the interior and condensation from forming.
How much do aluminium windows cost?
Each window is unique and the price depends on many different factors: size, materials, glass, security options etc. For a personalised quote, please contact us at finstral.com/contact.