Sir Alexander Gibb and Partners, a British firm of Consulting Civil Engineers, was founded by Scottish civil engineer, Alexander Gibb (1872-1958) in 1922. The company became the largest consulting civil engineering firm in the United Kingdom and was involved in projects all over the world. They were based at Queen Anne's Lodge, Queen Anne's Gate and subsequently Telford House, Tothill Street, Westminster, London until 1974, when it relocated to Earley House, 427 London Road, Reading, Berkshire. In the 1930's, in addition to heavy civil engineering, under the direction of Hugh Beaver, the firm brought together architecture and mechanical services with civil engineering, and so was able to offer to industrial clients a complete service. In 1939, they designed 3 large Ordnance factories for the Ministry of Supply; three other smaller factories followed later. The same year Hugh Eyre Campbell Beaver was a partner of the company. Other notable designs were the Kincardine Bridge, Guinness and Co's brewery at Park Royal, the Captain Cook graving dock at Sydney, the Singapore naval base, supervision of construction of Phoenix units for the Mulberry harbours and an underground factory for aeroplane engines at Corsham. The Company became incorporated in 1986 becoming Sir Alexander Gibb and Partners Ltd.

Easton Gibb and Son were contractors for Public Works, based at 9, Victoria Street, Westminster, London, S.W. It was founded by Alexander Easton Gibb - known more commonly as Easton Gibb (1841-1916) - in the 1870s. His son Alexander Gibb (1872-1958) joined the firm in 1900. Easton Gibb died in 1906 and the firm continued under the direction of Easton's son, Alexander, for sixteen years before he founded his own firm of consulting engineers (Sir Alexander Gibb and Partners) in 1922. Easton Gibb and Son were responsible for the construction of Rosyth Naval Base; the original programme was accelerated so that it was brought into use during WWI.

John Gibb and Son consisted of John Gibb, a Scottish civil engineer and contractor (1776-1850), and his son Alexander Gibb (1804-1867) also a civil engineer. They worked together on several contracts from the 1820s onwards. After his father's death, Alexander continued to work as a Civil Engineer and in the quarrying of granite in Aberdeen. They undertook the construction of the Wet Dock and other works, under the direction of Mr. Telford, by whom was also intrusted to them the erection of the Dean Bridge, near Edinburgh. Their attention being directed to railway works, Mr. Gibb and his son undertook, in 1836, the building of the Victoria Bridge, over the River Wear, on the line of the Durham Junction Railway, under Mr. Thomas Harrison. The last considerable work in which he was engaged, was the contract for the works across the Almond Valley, on the Edinburgh and Glasgow line, under Mr. Miller, and soon after its completion, in consequence of the decline of his health, Mr. Gibb retired from active employment.