Acting as part of the InspirED consortium the practice has secured preferred bidder status with South Lanarkshire Council to design and construct 17 new schools and work on the major refurbishment of two more.
The project forms part of a major schools modernisation programme in the region that will see a significant PFI workload.
South Lanarkshire council leader, Councillor Eddie McAvoy said he was delighted with the scale of the undertaking.
'This is fantastic news for South Lanarkshire schools,' he said. Initially we were looking at eight new-build schools and 11 refurbishments.
'But in partnership with InspirED we are delighted to be able to build 17 brand new schools and refurbish a further two - nine more new schools than originally anticipated and wthin the agreed budget.'