First announced by the
Land Transport Authority on 16 June 2011, construction of the depot commenced at the end of 2012 and is expected to be an at-grade depot. The largest orchid farm, Orchidville, was moved on 11 December 2012 to Sungei Tengah, and construction of the depot had begun in January 2013. Contract T201 for the construction of Mandai Depot and its associated facilities was awarded to Jurong Primewide Pte Ltd at a sum of S$329 million in October 2013. Construction began in December 2013, with completion in 2019. Contract T206 for the construction of bored tunnels between
Woodlands,
Woodlands South and Mandai Depot was awarded to Shanghai Tunnel Engineering Co., Ltd at a sum of S$421 million on 18 October 2013. Construction will start in 2014, with completion in 2020. The contract includes completion of twin bored tunnels between
Woodlands and
Woodlands South, twin bored tunnels between
Woodlands South and crossover tunnels to Mandai Depot, as well as a single bored tunnel between
Woodlands and Mandai Depot. In October 2020, the bus depot was handed over to Tower Transit, which had secured the contract for the Sembawang-Yishun Bus Package the previous month. ==Design==