Laing O’Rourke and Ferrovial needed just a single contract to top October’s contractor league table after they shared the £500m Northern Line Extension.
The firms were named preferred bidders in the summer but the contract was confirmed in mid-October.
Willmott Dixon took third place for the month with an impressive 18 contracts, according to construction intelligence unit Glenigan.
Its total was led by a £40m visitor centre at Hadlow College and a £34.5m school in Llandysul for Ceredigion County Council.
Other notable contracts secured in October included 13th-placed Winvic’s £50m deal for Sports Direct to build a warehouse/distribution centre in Mansfield, while Morgan Sindall secured fourth spot primarily thanks to its £90m project for cabling and excavation in Nottingham for Western Power Distribution.
It all change in the annual league as Balfour Beatty returned to the top for the first time since losing its position to Kier in April.
Both contractors, however, saw their hauls for the 12 months to October fall significantly compared with the 12 months to September, closing the gap to third-placed Morgan Sindall.
Royal Bam meanwhile climbed to fourth for the year, switching places with Mace.