Quick answer: in informal administration, generally no — the personal representative signs the deed directly. In formal administration, or once someone demands formal proceedings on the sale specifically, yes. Run your own numbers in the Wisconsin probate real estate sale calculator.
Built into the statute's own definition
Why the PR signs the deed personally
A personal representative succeeds to the title of the decedent, both as to real estate and personal property (§857.01, confirmed in Matter of Estate of Omernik). Practically, that means the PR personally signs the deed or transfer document with the necessary legal description when selling or transferring an interest in real estate.
A demand for formal proceedings can change things mid-sale
Any interested person can serve a demand for formal proceedings on a specific issue and file it with the court. That demand suspends informal administration — and the PR's powers — on that particular issue until the court reinstates them, which could pause a sale already underway if someone objects to it specifically.
Formal administration needs an attorney; informal doesn't have to
Formal administration requires the assistance of an attorney. Informal administration may be granted without one, though many personal representatives still choose legal help, especially for anything beyond a routine, uncontested sale.
A local probate attorney can review your estate — many offer a free consultation.
Whether the estate is in Milwaukee, Dane, Waukesha, or Brown County, the informal-versus-formal framework applies identically statewide.