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Your suggestion was interesting and possible, though from the further context unlikely. I stayed with my first impulse, that it was a misspelling of "schets" = sketch = Skizze.
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Explanation: "het hergebruiken van de 6 shets ..." -
"shets" is hier verkeerd geschreven, correcte spelling: "sheds".
Ein "shed" ist eine Dachform/Dachteil, vielgebraucht in der Industrie, um nicht-gerichtetes Licht ueber das Dach zu bekommen .
Eine Bedingung zur Baugenehmigung ist in diesem Zusammenhang die Wiederverwendung von 6 Sheds (Dachteilen).