09/09/2026
Simpson & Brown is currently working on a permanent extension to Dumfries House on behalf of The King’s Foundation. The new hall will replace a large temporary marquee previously used to host weddings, conferences, and private events held at the estate.
Designed by the Adam brothers and built in the 1750s as a residence for the 5th Earl of Dumfries, the house and its historic content, including a world-significant collection of Chippendale furniture, were saved for the nation in 2007 by King Charles III (then Prince of Wales). Today, the house and surrounding estate serve as the headquarters for The King’s Foundation.
The proposed scheme has been sensitively designed to align with the building’s classical proportions, creating a voluminous, light-filled venue to support the long-term financial sustainability of the estate. Inside, the interior character reflects a rigorous analysis of the estate’s original mouldings and carved details, positioning the new space naturally within Dumfries House’s architectural hierarchy and history of alterations. Externally, the design features a sheltered formal courtyard to the north, connecting the hall to the main house, and a discreet service yard with a new biomass boiler house lies to the east.
Construction is currently underway, with completion scheduled for 2027.