CH2M has been confirmed for the contract to manage the £4bn restoration of the Houses of Parliament along with architect BDP.
Construction News revealed last week that CH2M had fended off four rivals to land the programme, project and cost management services role for the Palace of Westminster revamp.
Capita Property Infrastructure / Gleeds Cost Management, Arcadis, and Turner & Townsend lost out on the contract to the US engineering giant.
Around £12m will be spent under these two contracts over the rest of this financial year.
Work that will be delivered under both contracts includes a detailed exploration of the condition of the building, a building-wide security strategy, planning for a major programme of asbestos removal, and fire safety improvements.
The award comes more than a year-and-a-half after the firms were shortlisted for the programme management contract.
The project is now waiting on a parliamentary debate over the decant option before works can begin.
The House of Commons and the House of Lords must decide on whether MPs will fully or partially leave the palace or whether they will remain.
It is understood that this vote will not be taken until after parliament’s summer recess finishes in September.