The Pennsylvania Supreme Court has held that a builder-vendor impliedly warrants that a house is constructed in a reasonably workmanlike manner and fit for habitation.
Elderkin v. Gaster, 447 Pa. 118, 288 A.2d 771 (1972).
John A. Knorr,
Contracts - Caveat Emptor - Implied Warranty of Habitability,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol12/iss1/16