J. Mora Moss House, Carpenter Gothic house in Oakland, United States

The J. Mora Moss House is a Carpenter Gothic residence in Oakland featuring pointed arch windows, ornamental wooden trim, and steeply pitched roofs. The structure uses wood throughout and displays vertical lines created by board-and-batten siding and grouped chimneys.

Joseph Moravia Moss bought the land from a Mr. Coffey in 1863 and commissioned architect S. H. Williams on 29 February 1864 to design a two-storey Gothic Cottage; builder Joseph F. Heston defaulted in December 1864 and Moss finished the work with his own builders. Moss, a longtime bachelor, married his housekeeper Julia Theresa Wood in 1867 and they named the estate Mosswood by joining their surnames. Julia added a single-storey study and a bay-window dormer to the master bedroom in the early 1890s, and after her death in 1904 Oakland bought the estate in 1912.

The house shows how American builders translated European Gothic design into local wooden structures using available craft techniques. Details like pointed arches and ornamental trim reflect a deliberate effort to recreate European architecture with practical materials.

The house stands inside Mosswood Park and serves as offices and storage for the Oakland Parks and Recreation department, so the interior is not open to visitors. It can be seen from the park grounds, near the 1950s community center addition built onto it. The building is Oakland Heritage Landmark #6, designated January 7, 1975.

The house was documented in 1960 by the Historic American Buildings Survey, which called it possibly the finest surviving example of French- and English-influenced Gothic adapted to wood-frame domestic architecture in the East Bay, and perhaps in Northern California. It was named Oakland Heritage Landmark #6 on January 7, 1975.