St John's Wood House, Ashgrove, Heritage listed villa in Ashgrove, Australia.

St John's Wood House is a single-story residence with a U-shaped design and walls built from local Enoggera granite, located at 31 Piddington Street in Brisbane. The building retains its original timber posts, pressed metal ceilings, and period flooring throughout its spaces.

Daniel Rowntree Somerset arrived from Northern Ireland in 1850 and purchased land in 1864 to build this residence. The property later became the name source for the surrounding neighborhood and remained one of the few grand houses in this part of Brisbane for decades.

The neighbourhood of St Johns Wood takes its name from this house, which was already known by that name when Dora Somerset died in February 1867. In May 1868 the Somersets' eldest daughter Anna was married at the house, shortly before it was leased to George Rogers Harding in June 1868.

St John's Wood House is a private residence at 31 Piddington Street, so it is viewed from the street rather than entered. The single-storey granite villa sits on its original Ashgrove site, and the neighbourhood streets around it carry the name it gave them. Approach on foot and look for the verandah, gabled porch and tall chimney from the road.

The house was built of Enoggera granite cut from exposed rocks on the nearby hillside, which earned it the name Granite House. Its designer and builder remain unconfirmed; the Brisbane contractor Joshua Jeays, who built the nearby Bardon House in 1863, has been linked to it but no firm evidence has been found.