A built-in domestic appliance is provided that has a length-adjustable spacer sleeve to fasten the built-in domestic appliance to a wall with a fastening screw. The length-adjustable spacer has a first sleeve part mounted on the built-in domestic appliance and a second sleeve part that is telescopically adjustable relative to the first sleeve part and that is adjustable, in length, along an axis with respect to the first sleeve part until the second sleeve part is in contact with the wall. The built-in domestic appliance also includes a rotational securing assembly that limits rotational movement of the second sleeve part about the axis.