Laing O'Rourke is a multinational construction company headquartered in Dartford, England. It was founded in 1978 by Ray O'Rourke. It is the largest privately owned construction company in the United Kingdom.^[3]

The company was founded by Ray O'Rourke in 1978. Initially a specialist concrete subcontractor, it was originally based in East London, and was known as R. O'Rourke & Son.^[4] In September 2001, R. O'Rourke bought main contractor Laing Construction from John Laing plc for £1. Laing's construction business had been making significant losses, in part due to additional costs on the Cardiff Millennium Stadium project, the National Physical Laboratory, and No 1 Poultry in the City of London.^[5] The name of the company was changed to Laing O'Rourke.^[6]

In May 2004, the company acquired Crown House Engineering, a mechanical and electrical engineering business, from Carillion.^[7] Laing O'Rourke went on to expand its operations in Australia in July 2006, when it acquired Barclay Mowlem, also from Carillion.^[8] In 2015, the company became a member of the Housing and Finance Institute.^[9]

In December 2015, the chief executive officer of the company, Anna Stewart, stepped down with immediate effect due to ill health. Ray O'Rourke, the company's executive chairman, assumed her role^[10] although it was reported that O’Rourke could only spend a limited number of days in the United Kingdom, due to his tax exile status in Jersey.^[11]

On 11 January 2016, Laing O'Rourke announced that it had begun the formal sale process of selling its Australian business. This was a result of multiple unsolicited offers and a desire to invest more heavily in the company's operations in the United Kingdom.^[12]

In the year to 31 March 2016, the group made a pre tax loss £246m, after being hit by poor performance on its £1.3bn PFI hospital contract (at CHUM) in Montreal, Canada, and on several now completed problem contracts in the United Kingdom.^[13] In December 2016 it was rumoured the Australia arm has been taken off the market after Laing O’Rourke failed to find a buyer.^[13] The sale process was later discontinued and the Australian business was refinanced in 2017.^[14]

In March 2017, the company withdrew 800 of its workers from the Ichthys LNG storage tank project after not receiving payments from Kawasaki for its work for several months: the amount in dispute was $250 million^[15][16] although Kawasaki rejected claims that it owed the disputed money.^[17]

In the year to 31 March 2017, the group made a pre tax loss of £67m, largely due to losses of £81m (on revenues of just over £2 billion) at the largest operating division, Laing O'Rourke plc, mainly attributed to its PFI hospital contract at CHUM in Montreal, Canada. The contracting business then employed 8,539 people, more than half of the group's then 15,273 staff.^[18]

Publication of the group's results of 2018 was delayed due to "historic turbulence in the construction sector" following the January 2018 collapse of Carillion;^[14][19] in December 2018, the company said increased scrutiny from lenders and accountants was delaying a refinancing move,^[20] finally closed in January 2019.^[21]

With its operations refinanced in the United Kingdom, Laing O’Rourke published accounts for the year to 31 March 2018, showing the group made a pre tax loss of £46.5m (down from £60.6m in 2017) on turnover down to £2.93bn from £3.17bn.^[22]

In March 2023, Ray O'Rourke's son Cathal O'Rourke was appointed the company's chief operating officer.^[1]

Laing O'Rourke accounts for the year to 31 March 2023 showed a pre-tax loss of £288m on total revenues of £3.4 billion (including £2.18bn turnover from its Europe operations and £1.13bn in Australia).^[23] In January 2024, it began company-wide cutbacks as financial analysts warned about the company's financial safety. People on sites across the group were served redundancy notices, including 60 at the Laing O'Rourke Centre of Excellence for Modern Construction (CEMC) at Steetley in Nottinghamshire.^[24]

Laing O'Rourke has operations in two major geographic hubs, Europe and Australia. European operations span Abu Dhabi, Canada, Dubai and the United Kingdom. Australian operations cover Australia, Hong Kong, New Zealand and South East Asia^[25] The company operates in building construction, infrastructure construction, investment & development, modular manufacturing, engineering expertise and support services.^[26]

Its projects span a range of sectors including, building, transport, power, water & utilities, mining & natural resources and oil & gas.^[27]

Major projects involving the company have included;