German company Dorsch is preparing the detailed project report (DPR) and will also develop the new airport at Purandar in Pune district, he said.
"The work was slow as necessary permissions from the defence ministry were pending. The permissions have been received a couple of days back and now the company can complete its DPR," the official said.
"The primary estimated cost of the airport is Rs 14,000 crore. Once the report is completed, we will come to know the actual cost," he said.
The German company, which had prepared the DPR and developed airports in cities like Berlin, Munich, Kuwait and Frankfurt, had been given the contract for the Pune project in March last year.
Maharashtra Chief Minister Devendra Fadnavis had announced the new airport project, to be named after Chhatrapati Sambhaji Raje, in October 2016.
The airport, which is expected to take around five years to complete, will be spread across an area of 2,400 hectares. The acquisition of land will take place in seven villages of Purandare tehsil.