| 1911-12 |
Assistant engineer (under R.W. Vawdrey), Indented Bar & Concrete Engineering Company |
| 1912-13 | Senior designer, then chief estimating engineer for Trussed Concrete Steel Company ... principal project : Gramophone Company Building |
| 1913-14 |
Resident engineer for Trussed Concrete Steel Company at Patent Fuel Works, Swansea Docks |
| 1914-16 | Chief estimating engineer, Trussed Concrete Steel Company |
| 1916-17 | Assistant aeroplane designer, Wells Aviation |
| 1917-18 | Various ships and slipways, Poole, Dorset |
| 1919 | Williams Concrete Structures Ltd launched by Owen Williams |
| 1919-22 |
Various projects using 'Fabricrete' including ... T. Wallis & Sons factory and power station, Acton, London Henry Boston & Sons tannery, Runcorn, Cheshire Patent Fuel Factory, Port Talbot, West Glamorgan British Window Glass Works, Queensborough, Cheshire Blackstones Tractor Factory, Stamford, London Ice factory, Grimsby, Humberside Mappin & Webb factory, Sheffield Fuel stages, Swansea Fairie & Company Sugar Refinery, Liverpool Bush House foundations, Aldwych, London |
| 1921-24 |
British Empire Exhibition buildings [ British Empire Exhibition site ] architect: Maxwell Aryton |
| 1921-24 | Wembley Stadium ... architect: Maxwell Aryton |
| 1924-25 | Lea Valley Viaduct and Bridge ... architect: Maxwell Aryton |
| 1924-25 | Parc des Attractions, Paris |
| 1924-26 | Findhorn Bridge ... architect: Maxwell Aryton |
| 1924-27 | Road Bridge, Shepherd Leys Wood |
| 1924-29 | Bournemouth Pavilion ... architect: Home & Knight |
| 1925-26 | Spey Bridge, Newtonmore ... architect: Maxwell Aryton |
| 1925-26 | Crubenmore and Loch Alvie Bridges ... architect: Maxwell Aryton |
| 1925-26 | Duntocher Bridge ... architect: Maxwell Aryton |
| 1925-26 | Belfast Water Tower, Northern Ireland |
| 1925-28 | Wansford Bridge ... architect: Maxwell Aryton |
| 1926-28 | Dalnamein Bridge ... architect: Maxwell Aryton |
| 1926-28 | Carr Bridge ... (demolished) architect: Maxwell Aryton |
| 1926-28 | Lochy Bridge ... architect: Maxwell Aryton |
| 1927-28 | Brora Bridge |
| 1927-30 | Montrose Bridge |
| 1928-29 | Pont-Rhyd-Owen Bridge |
| 1928-30 | Wadham Road Viaduct |
| 1928-30 | Harnham Bridge, Wiltshire |
| 1928-30 | Steyning Farm, Sussex |
| 1928-30 | Pilkington's Warehouse, London |
| 1929-30 | The Dorchester Hotel proposal |
| 1929-31 | Wakefield Bridge |
| 1929-31 | Llechryd Bridge proposal |
| 1929-31 | Daily Express, London ... architect: H.O. Ellis & Clarke |
| 1930-32 | Boots Packed Wet Goods Factory |
| 1931-33 | Sainsburys Factory and warehouse |
| 1932 | Waterloo Bridge proposal |
| 1932-33 | Tunnel Cement Reinforced Concrete Laboratory |
| 1932-34 | Cumberland Garage and Car Park |
| 1933-34 | Empire Pool, Wembley |
| 1933-35 | Pioneer Health Centre, London |
| 1933-36 | Residential flats, Stanmore |
| c.1934 | Westcliff-on-sea Pavilion proposal |
| c.1935 | Empire Hall proposal |
| 1935-37 | Provincial Newspaper office, London |
| 1935-38 | Boots Factory extensions |
| 1935-38 | Oldhams Printing Works |
| 1935-39 | Daily Express, Manchester |
| 1936-37 | Lilley & Skinner office and warehouse extension |
| 1936-38 | Dollis Hill Synagogue |
| 1936-39 | Scottish Daily Express, Glasgow |
| 1937-38 | Removable restaurant ... opposite Wembley Stadium |
| 1937-39 | Hunt Partners extension |
| 1937-39 | Tunnel Cement Laboratory and offices |
| 1938-39 | Daily News Garage, London |
| 1938-39 | Evening Standard renovation and extension |
| 1938-39 | Proposed house at Churt |
| 1939 | Thomas S. Vandy joins Owen Williams as partner |
| 1939-41 |
Vickers-Armstrong Aircraft Factory completed by Oscar Faber & Partners |
| 1940s | Firm expands and becomes Sir Owen Williams & Partners |
| 1940-43 | Concrete ships, various |
| 1944-45 | Wilvan Houses |
| 1944-45 | Mobile home |
| 1945 | Owen Williams' son, Owen Tudor Williams, joins as partner |
| 1945-67 | Newport By-pass (present-day M4) |
| 1947-48 | 1948 Olympics (technical advice) |
| 1950-55 | BOAC Maintenance Headquarters, Heathrow | 1950-55 | Grosvenor Square car park proposal |
| 1951-59 |
M1 Motorway phase one [ M1 Motorway, earliest section, northern end ] [ M1 Motorway standardised bridges ] |
| 1953-66 | Port Talbot By-pass |
| 1954-56 | BOAC Wing Hangars, Heathrow |
| 1955-61 | Daily Mirror Building |
| 1956-67 | M1 Motorway phase two |
| 1958-71 | Midlands links motorway |
| 1959-60 | Daily Express, Manchester |
| 1960 | Channel Bridge proposal |
| c.1960 | Tiered motorway viaduct proposal |
| 1966 |
Sir Owen Williams retires as Managing Partner of Sir Owen Williams & Partners, though remains a partner |

