Petty house is regional British English for an outhouse.
It may also refer to:
in the United States (by state then city) Petty House (San Antonio), Texas Petty–Roberts–Beatty House, historic octagon house in Clayton, Alabama, listed on the National Register of Historic Places (NRHP) Perry–Petty Farmstead, Mansfield Township, New Jersey, listed on the NRHP in Warren County Buckingham-Petty House, Duncan Falls, Ohio, listed on the NRHP in Muskingum County Petty House (Hot Springs, South Dakota), listed on the NRHP in Fall River County Crawford-Pettyjohn House, Pierre, South Dakota, listed on the NRHP in Hughes County