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Hey Siri, extend the sail!
Electric sun sail, smart control: this made-to-measure Doppel-Dreieck and Trapez sun sail is easily controlled by app, Siri, Alexa or Google Assistant – automatic weather response included.



The challenge: keep it open, offer protection
The terrace is a key part of the house – with an infinity pool and a direct view of the mountains. At the same time, the large areas of glazing heat the interior heavily. Conventional answers such as awnings or parasols were out of the question: they would have spoilt the clean architecture and restricted the view.

Made-to-measure electric sun sail – Doppel-Dreieck and Trapez, controlled by app and voice command.
Two made-to-measure sails – a Doppel-Dreieck and a Trapez – span the entire terrace. The shapes were matched exactly to the building, to ensure optimal shade with minimal loss of view.
Control is fully automatic or by voice command:
Siri, Alexa, Google Assistant – on command the sail extends. Light and wind sensors handle automatic weather response, with no manual intervention.
By app, Siri, Alexa or Google Assistant, the sun sail responds at the touch of a button or by voice. The technology stays discreetly hidden – from outside, only the elegant sail is visible, not the mechanics behind it.
The smart sun sail blends harmoniously into the architecture. The structural elements recede visually – creating shade that feels a natural part of the house, not a technical add-on.
The sun sail protects not only the terrace but noticeably improves the indoor climate throughout the living area. Large glass surfaces stay clear – with no intrusive external blinds blocking the view.
The outdoor space becomes a true living space: shaded, comfortable and controllable any time by voice or app.
Wind and light sensors take over control fully automatically. In a storm the sail retracts on its own; in the morning it extends automatically – reliable and hands-free, 365 days a year.
Doppel-Dreieck & Trapez

Individually made to measure
The Doppeldreieck sail shades terrace and interior without restricting the panoramic view of the Allgäu Alps – the sight stays clear.

Smart home – app, Siri, Alexa
Posts and brackets in anthracite, clad in wood, recede visually. The shading feels not technical, but part of the house.

Fully automatic & weatherproof
A sun sensor and wind sensor control the sail: out in the morning, in at night. In storms above 20 m/s it safely retracts on its own.

Better indoor climate
The sail cuts the heat on the terrace and in the living area – with no external blinds. The large glass surfaces stay fully clear.
Conclusion
This project shows how modern sun-protection design and smart-home technology can merge: comfortable, energy-efficient and lastingly reliable. An electric sun sail by LET that fits seamlessly into daily life – and, if you wish, simply responds on command. The result is an outdoor space that feels natural and adapts to your needs at any time.
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