Graham Construction has been chosen over Kier to deliver a £150m major works programme for Barnet Council, following a one-month delay.
Graham Construction will deliver new schools, libraries and community facilities under the Capital Projects programme.
The programme will last for five years with the possibility of a two-year extension.
Work will begin with two approved leisure centre schemes and school developments.
Construction News revealed in September that Graham Construction and Kier were going head-to-head for the job after the council pushed back its decision to name a winner by over a month.
A contractor was expected to be chosen in August but Barnet Council delayed this until October.
Speaking at the time of the delay, a council spokesman said: “With a procurement such as this, it is normal for the timetable to change depending on the numbers of clarifications needed and the complexity of the evaluation process.”
The council added that it had invested additional time in the final stage of the process due to the importance of the procurement.
The announcement comes three months after Graham Construction bagged a place on the £4bn ProCure 22 framework, the winners of which Construction News revealed in August.
Kier, Bam Construct, Galliford Try hps, Integrated Health Projects (Sir Robert McAlpine / Vinci) and Interserve also secured a place on the programme.
Graham Construction and Bam Construct replaced Willmott Dixon and Balfour Beatty who failed to win back their places having featured on ProCure21+.