NOTES: F.R.S. Yorke was the consulting architect for this factory-made steel-clad house commissioned by the Ministry of Works. The house derived its name from Baron Portal, of Laverstoke in the County of Southampton (later Viscount Portal), who served as Minister of Works during World War II.
NOTES: Thirteen part-prefabricated houses were built for the Ministry of Works at Northolt to show alternative types of materials, plans and construction. The steel frame and cladding were designed by Frederick Gibberd and built by the British Iron and Steel Federation.