 The 1904 extension, consisting of isolation facilities and outpatients' accommodation, was in the Vernacular/Domestic style with half-timbered gables with jettying, prominent mullions and transoms to the bay windows, and a small tower.The new hospital, designed by Building Design Partnership, is in the form of an ark, and has a "nautical theme" appropriate to the seafront location.The exterior has curved corners and is clad in white precast concrete, intended to evoke the painted stucco which is closely associated with Brighton's seafront Regency architecture.