Sir Robert McAlpine Ltd. is a private British company headquartered in London.

It carries out engineering and construction for the oil and gas, petrochemical, power generation, nuclear, pharmaceutical, defence, chemical, water and mining industries.

The company was founded in 1869 by Sir Robert McAlpine, who was known as "Concrete Bob". In 1935, Sir Robert's son Alfred established a separate construction company Alfred McAlpine that operated in the north west of England while Sir Robert McAlpine Ltd. operated in the rest of the United Kingdom.

The company constructed the Dorchester Hotel on Park Lane in London. When the client was unable to pay for the construction works, the company took possession of the completed building and operated it on its own account.

Source: Wikipedia