The services contractor has come up trumps taking three contracts covering highways maintenance, street lighting and resurfacing works in both boroughs.
Harrow has confirmed the value of its package worth £50m.
When the job was first advertised Harrow and Brent Councils had decided to pool their highways maintenance packages in an attempt to benefit from economies of scale, reduce duplication and to drive down cost.
This would have valued the combined maintenance contracts in the region of £120m, but the idea for combining the borough’s work was eventually dropped and Harrow pressed on alone.
Council procurement chiefs will also now count on the contractor to deliver on promised plans to help reduce the council’s carbon footprint on highways work.