Adam Architecture proposals to demolish a Belgravia coach house that once belonged to the Marquess of Headfort and replace it with a clasically-inspired new structure would almost double the property’s value, estate agents marketing the mansion have claimed.

Beauchamp Estates said the proposals, drawn up by Robert Adam’s practice for the unlisted Headfort Place home, made the property – developed in the mid-19^th century under Thomas Cubitt – one of Belgravia’s “most outstanding and rare development opportunities”.

Beauchamp is currently marketing the mansion for £6.5m but said that redeveloping it in line with Adam’s 2017 planning consent would result in a property worth £12m.

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