The theatre was, along with the adjacent St Martin's conceived by their architect, W. G. R. Sprague, as companions, born at the same time in 1913, but the First World War interrupted the construction of the latter for three years. The Ambassadors was built with the intention of being an intimate, smaller theatre and is situated opposite the renowned restaurant The Ivy, favourite haunt of the theatrical elite. The theatre was Grade II listed by English Heritage in March 1973.