No, a Wisconsin landlord must always provide 12 hours of advance notice before entering a tenant’s unit. This includes in most “regular” situations where a landlord is conducting business, including performing necessary repairs or showing the space to a prospective renter. Emergency situations are not covered by this standard, however. In those cases, a Wisconsin landlord may be justified in entering without permission to warn the inhabitants of the impending danger.
The information for this answer was found on our Wisconsin Landlord Tenant Rights answers.