Davis Langdon was a construction consultancy company originally founded in London in 1919,[1] which grew to approximately 2,500 employees working in over 18 countries worldwide.

Horace William Langdon established a quantity surveying practice in Holborn, London in 1919, and worked for a time in partnership (dissolved 1927) with a John Belmont Taylor.

(Langdon was a local councillor and served as mayor of the Metropolitan Borough of Holborn (1935–1936); Every was Director of Post-War Building Programmes at the Ministry of Works, recognised with a CBE in the 1946 New Year Honours.)

[4] In October 2010, the company became part of AECOM Technology Corporate[5] – a global provider of professional technical and management support services.

The company provides these services for clients investing in infrastructure, property and construction and has worked on a number of high-profile projects including the Olympic Park for the 2012 Summer Olympics in London; Tate Modern and the Eden Project in the United Kingdom; Estádio do Dragão in Portugal; Abu Dhabi International Airport; Grand Egyptian Museum in Cairo, Egypt; The Gateway Bridge Upgrade in Brisbane, Australia; the San Francisco Transbay Terminal, U.S.; the Gautrain Rapid Rail Link in Johannesburg, and Green Point, Cape Town – built for the 2010 FIFA World Cup – in Cape Town, South Africa.