Mowlem was one of the largest construction and civil engineering companies in the United Kingdom. Carillion bought the firm in 2006.
The firm was founded by
John Mowlem in 1822, and was continued as a partnership by successive generations of the Mowlem and Burt families, including George Burt, and Sir John Mowlem Burt. 
The company was awarded a
Royal Warrant in 1902 and went public on the London Stock Exchange in 1924. A long-standing national contractor, Mowlem developed a network of regional contracting businesses including Rattee and Kett of Cambridge (bought in 1926); E. Thomas of the west country (bought in 1965); Ernest Ireland of Bath; and the formation of a northern region in 1970. During the Second World War the company was one of the contractors engaged in building the Mulberry harbour units. 
Mowlem acquired SGB Group, a supplier of scaffolding, in 1986.
Mowlem also bought Unit Construction in 1986, giving the firm a substantial presence in private housebuilding - within two years, sales were up to an annual rate of 1,200. The ensuing recession led to losses of over £180m between 1991 and 1993 and banking covenants came under pressure. The housing division was sold to  Beazer in 1994. 
Mowlem was bought by
Carillion in February 2006. 
Major projects undertaken by or involving Mowlem included:
Mowlem was also the owner and developer of
London City Airport completed in 1986. 
John Mowlem - Biography of the founder of the company
George Burt - Biography of his successor as manager of the company
Edgar Beck - Biography of chairman then president between 1961-2000 Frank Baines History of John Mowlem unpublished typescript history held at London Metropolitan Archives
"Burt, Sir John Mowlem, Kt". National Maritime Museum Cornwall. NMMC . Retrieved 2015.
^ Hartcup, p. 94
Notes on Financial Times Actuaries Index 1986 Archived 2005-01-07 at the Wayback Machine
^ Wellings, Fred: Dictionary of British Housebuilders (2006) Troubador.
Construction firms agree takeover BBC News, 2006
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^ a b c d
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^ a b c d
Mowlem 1822-1972 - Mowlem Public Relations brochure, 1972, p.8
^ a b c
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Mowlem dives into the red Evening Standard, 4 February 2005
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Mowlem sighs with relief on pounds 15.5m disposal The Guardian, 31 October 1995
Hartcup, Guy (2011). Code Name Mulberry: The Planning Building and Operation of the Normandy Harbours. Pen & Sword Military. ISBN . 978-1848845589 Mowlem 1822-1972 - Mowlem Public Relations brochure, 1972