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Minimalist design sliding windows and sliding doors 
– transparency for innovative architecture!

 Modern contemporary architecture - pared down to the essentials!  Clean lines, balanced proportions and one element which plays a very particular role - light. Whether an exclusive villa, detached house, apartment or business complex, open interiors and maximum daylight admission  with unobstructed views to the outside are high on the list of priorities for today’s building clients.

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The desire for design and exclusivity is more than met by KELLER’s premium sliding and fixed window system -  minimal windows®. The frame profiles are pared back to the minimum and can be fully integrated into the floor, walls and ceiling. Only the slimline leaf profiles with 21 or 26 mm facing width are visible. Up to 98% of the area is therefore glass.

the frameless sliding window design


The variety of system configuration options ensures a degree of practical flexibility which leaves nothing to be desired. Up to four-track sliding systems, glass-to-glass inside and outside corners, floor, ceiling and wall-flush installation and wall-inlets into which sliding elements disappear completely into the brickwork are all possible. The floor area is free of bothersome thresholds and thus barrier-free. It creates a seamless transition from inside to outdoors.


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High-performance tracks and rollers in stainless steel guarantee easy-action manual operation, high operating safety and durability. You can opt alternatively to have the sliding elements, which can weigh up to 1000 kg, electrically driven.  This guarantees maximum operating comfort.

easy-action operation

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The large-scale, frameless double-glazed sliding windows and doors in insulating glass allow comfortable, easy-action and silent opening and closure of the thermally-broken transparent surfaces. This is a decisive plus for ease of use on a daily basis. The facing width of the intermediate profiles is just 21mm.

minimal windows®

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Aesthetics, combined with high performance features communicate the clean minimalism of our system glass façades. The system glass façade profiles between the two storeys comprise insulated, concealed prone aluminium frame profiles and are ideal wherever minimal profile facing widths and maximum window height are required. The flush-fitting grass facade can be combined on request with slimline design sliding doors and is the perfect solution for high-quality double-glazed residential and commercial buildings.

minimal windows® highline


Some customers know exactly what they want. Others are inspired by photos of other projects which help them to define their style and design specifications more clearly. Check out the Gallery on our website and also on the individual product pages for photographs of a few among many projects we have completed around the world.

You can also find our current catalogue in the “Download” menu. We shall be happy to send you our image brochure as well. We design and build exclusive home conservatories and window systems which are designed specifically for your property and your lifestyle.


With us, your building project is in experienced hands from start to end.

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