Bids need to be submitted by November 12 and are to be opened later that day, the Public Procurement Agency said in a tender notice published last week on its website.
Construction works are planned to be completed in 24 months.
Bulgaria’s transport ministry said in June that the construction of the section will be co-financed with 55 million euro ($71.7 million) saved from other tenders financed under the EU-funded operational program Transport.
Local Capital Daily quoted the head of Metropoliten Stoyan Bratoev as saying that the project was expected to cost total of 80 million euro and to be co-financed from the state or the municipal budget.
Sofia’s subway network is 31 km long and has 27 stations.
($ = 0.7673 euro)