The House is part of the Mount Stuart Trust, set up in 1989 by 6th Marquess of Bute in order to preserve the house, gardens and estate as an integral unit. Bute Estate operations, also under the direction of the trust controls 10,900 hectares of land, covering much of the island. The business is diverse and active including agricultural and residential properties, forestry, sawmill, works department, gardens department and an island wide ranger service.

The House contains one of the nations most important art collections, Old Masters and artefacts.

The 120 ha (300 acres) gardens and grounds are housing an impressive collection of native and exotic flora. Thomas Mawson designed the rock garden and a walk replicating the Via Dolorosa (the route Christ took to Calvary with the Cross). There is a magnificent old Lime Tree Avenue and a collection of endangered conifers.

The House is also used for Film & Photo shooting, corporate, private, exclusive use, and cultural events such as temporary exhibitions, meetings, weddings...

For more detailed information about history, collections and events, see website.