Wis. Stat. § 810.09: Property in building, how taken.

If the property or any part thereof is in a building or enclosure the sheriff may demand its delivery. If the property is not delivered the sheriff shall advise the plaintiff of the refusal of the delivery. The plaintiff may then apply to the court for a warrant upon a sufficient showing of probable cause that the property is contained in the building or enclosure and upon delivery of the warrant of the judicial officer to the sheriff the sheriff may then enter and take the property.