Penders, Heritage-listed holiday retreat in Tanja, New South Wales, Australia

Penders is a heritage-listed holiday retreat on Haighs Road at Tanja, near Bithry Inlet and Wapengo Lake. Architect Roy Grounds designed it and Hamish Ramsay with local builders constructed it between 1964 and 1980. The property includes a nine-sided barn, a geodesic dome, and residential buildings, and is also known as the Grounds and Myer Holiday Retreat.

Architect Roy Grounds and businessman Ken Myer acquired the land in 1965 and designed the structures using materials sourced from the surrounding area. The owners donated the property to New South Wales in 1973, ensuring its preservation and public access.

Penders is also known as the Grounds and Myer Holiday Retreat, the "Barn" and Myers House. Architect Roy Grounds and businessman Ken Myer built it between 1964 and 1980 with Hamish Ramsay and local builders, and the Office of Environment and Heritage now owns the property, added to the New South Wales State Heritage Register on 29 November 2013.

Penders stands at the end of Haighs Road in Tanja, beside Bithry Inlet where it opens into Wapengo Lake. The property is owned by the Office of Environment and Heritage and lies within Mimosa Rocks National Park, so access and any stay must be arranged in advance. Rock platforms along the shoreline allow line fishing in deeper water.

The retreat's buildings carry names from the families who made it: the Grounds and Myer Holiday Retreat, the "Barn" and Myers House. The Office of Environment and Heritage owns the property, which was added to the New South Wales State Heritage Register on 29 November 2013.