Williams designed his buildings as functional structures sheathed with decorative facades. More an engineer than an architect, Williams produced a series of reinforced concrete buildings during the period between the wars. After World War II he worked on developing the first plan for Britain's motorway system.
In the 1940s the company expanded and became Sir Owen Williams and Partners.
His other works include the Dorchester Hotel, the Boots pharmaceutical factory in Beeston, Nottinghamshire, the Daily Express Buildings in London and Manchester, the M1 Motorway.
His nephew is quoted as saying "Just fancy Taid taking all that time over the trip to Barnet, when 60 years later his Grandson was head of Civil Engineering for the M1 ....."