From the State Bar of Wisconsin:
Castle Doctrine (UPDATE): Expanded self-defense bill on its way to Gov. Walker
... expands a person’s right to use deadly or substantial force against someone who unlawfully and forcibly enters their “dwelling,” “vehicle,” or “place of business,” regardless of whether such force is necessary or reasonable to defend against imminent death or substantial harm.
A “dwelling” encompasses "any premises or portion of a premises that is used as a home or a place of residence and that part of the lot or site on which the dwelling is situated that is devoted to residential use." Wis. Stat. section 895.07(1)(h). "Dwelling" also includes other existing structures on the immediate residential premises such as driveways, sidewalks, swimming pools, terraces, patios, fences, porches, garages, and basements. Id.
Under the new law, if signed by Gov. Walker, a court must presume a person was justified in killing an intruder, regardless of whether the property or business owner or legal occupant (collectively, “property owner”) reasonably believed the force was necessary to defend against imminent death or substantial harm.
The presumption applies if a person entered or was in the process of entering a dwelling, vehicle, or place of business unlawfully and by force, and the property owner was present inside the dwelling, vehicle, or place of business. The property owner must reasonably believe an unlawful and forcible entry occurred or was occurring.
If those elements are found, the property owner will benefit from an instruction to the jury that use of deadly or substantial force is presumed “reasonable.”