Holmwood House is the finest and most elaborate residential villa designed by the Scottish architect Alexander "Greek" Thomson.

A Category A listed building, the villa is located at 61–63 Netherlee Road, Cathcart, in the southern suburbs of Glasgow, and is owned by the National Trust for Scotland.

Couper and his brother Robert owned the Millholm paper mill in the valley of the White Water of Cart immediately below the villa.

The nuns put the property on the market in the early 1990s, and there was a danger that the grounds would be developed for housing, destroying the setting of the villa.

In 1999, the Clydesdale Bank issued a £20 note to mark Glasgow's celebrations as UK City of Architecture and Design which featured an illustration of the dome of Holmwood House, along with the Lighthouse building on the reverse.