Spring 2026

Boneh, the melacha of building, is not just for the lumberyard. It has many applications in the kitchen. Cheesemaking and churning butter are boneh.[1] Shaping egg salad and smoothing chopped liver can be boneh as well.[2] It can even apply to household appliances: according to some poskim, attaching a magnet to a refrigerator on Shabbos with the intention of leaving it there long-term is prohibited because of boneh.[3]

Recently, STAR-K certified a line of Gaggenau ovens without handles. Instead, they open electronically at the push of a button. In Sabbath Mode, this feature is deactivated and the door must be opened without mechanical assistance. The manufacturer offers a detachable handle to make opening the oven easier.

If these handles snap or suction into place, they should not be attached on Shabbos, as a semi-permanent attachment may violate the prohibition of boneh. (They should also not be removed on Shabbos due to the prohibition of sosair, demolishing). This is a greater concern than the question of magnets, since the handle is intended to function as part of the appliance. An owner of such an oven should attach the handle before Shabbos begins.

[1] Mishnah Berurah 319:63: Gathering pieces together and forming them into a single object is like building.

[2] Shmiras Shabbos Kehilchasa 11:11.

[3] Shmiras Shabbos Kehilchasa 16:24 and 23:46.