The Green Line and the Pink Line mass transit projects are expected to get cabinet approval next month, according to the Mass Rapid Transit Authority (MRTA).
MRTA governor Yongsit Rojsrikul said the details of the projects are being reviewed by the Transport Ministry.
He said bidding is expected to be called as soon as the cabinet approves the schemes.
"Both schemes were submitted to the ministry in December last year. More documents were sought which we submitted as requested.
"We should be able to proceed as scheduled," he said.
The Green Line runs from Mor Chit to Saphan Mai and Ku Kot while the Pink Line project runs from Min Buri to Khae Rai. Both are expected to open by 2017.
Mr Yongsit also said the MRTA and the National Housing Authority (NHA) are expected to submit details of a planned joint venture to the cabinet in the next two months.
The MRTA and NHA will co-invest in commercial property development along the mass transit lines.
He said commercial property projects are being considered in the Bang Ping area along the planned Green Line, the Min Buri area on the Pink Line and the Bang Yai area on the Purple Line.
"We will have accommodation, shopping malls and office buildings. It will help increase the number of passengers," he said.