1824
A good sized two-story house on Vandermark creek was enclosed.
The regionGrade A · 1 independent source
The evidence
“In 1823 his father came out and united with him in erecting the first sawmill on the Vandermark creek, which they got to running the last day of that year. In this he sawed logs on shares and obtained lumber to put up a good sized two-story house, which he had enclosed in 1824. In it he had a large fireplace with andirons and a crane to swing over and off of the fire with hooks to hang pots and kettles on.”
1908-brown-rock-county/34c-biographical-3.md, Vol. 2, PDF p. 446 / book p. 936
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources