The ten-year deal involves refurbishment and repair of the roof and shrouding the famous building in scaffolding.
The repairs will be carried-out in four phases on the roof with funding agreed for the first £14.6m phase,
An OJEU notice for the deal states: “The Corporate Officer of the House of Lords and Corporate Officer of the House of Commons, acting jointly, require a Contractor to undertake the Work involving the overhaul and refurbishment, including structural repair, of the Cast Iron Roofs at the Palace of Westminster.
“This will require the refurbishment and repair of damaged elements of the roof structure and components, and the application of an anti-corrosion treatment.
“It will be necessary to remove the tiles and other external components and repair and treat them in factory conditions away from site. Following remedial works, they will be returned and reinstated.
“Upon the removal and inspection of the roof tiles, it is anticipated that a percentage of these tiles will be beyond economic repair or overhaul, and that new cast iron tiles will be required.
“This will be required to be manufactured at on offsite Foundry facility inclusive of the production of the necessary patterns.
“Scaffolding will be an important part of the works and must provide a weather tight and secure temporary roof. Full protection will also be required internally within the roof space.”
Part of the first phase to repair the roof was carried-out under a £7m deal by Shepley Engineers who refurbished the roofs to Speakers Court.
Firms have until August 20 to express an interrst in the job at he House of Lords and House of Commons, SW1H 9NB London