It belonged to the Houstouns of Milliken, who acquired the estate of Easter Cochrane in 1773. The original structure was substantially enlarged in 1771 and 1812 by George Houstoun, who had the structure remodelled in a castellated style complete with a turret at the left hand of the front elevation, possibly by the architect James Gillespie Graham.
The most notable features were barrel vaulted rooms in the ground floor. Externally in addition to the battlemented decoration there was a rope-styled string course. Although the castle and policies were considered particularly picturesque, the continued growth of the town of Johnstone reduced its size and the estate had largely disappeared by the start of the 20th century. Much of the house was demolished in 1950, and most of the remainder of the grounds was purchased by the local authority for housing in 1956.
Johnstone Castle's principal claim to fame is a visit by the Polish composer Chopin in 1848. He had been invited by Anne Houstoun, wife of the then-laird Ludovic, as part of his Scottish tour. Although like many others he was charmed by the estate and grounds, the weather deteriorated, and he wrote to his friend Wojciech Grzymała:
The weather has changed, and it is dreadful outside. I am feeling sick and depressed, and everyone wears me down with their excessive attentions.
To compound his misery he was also involved in a potentially fatal accident. Out riding in a two-horse carriage, one of the animals reared and broke loose from the reins with Chopin still inside. The carriage hit a tree and smashed into pieces, leaving the composer to climb free of the wreckage.
- Walker, Frank Arneil (1986) The South Clyde Estuary, RIAS
- Scott, Charles A. 'Burgh of Johnstone' in The Third Statistical Account of Scotland- The County of Renfrew (1962) (ed. Moisley et al), Collins
- "Johnstone Castle: Listed Building Report". Historic Scotland.
- quoted in Zaluski, Iwo & Pamela (1993) The Scottish Autumn of Frederick Chopin, John Donald.
- Zaluski (1993)
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