Construction work on Zaha Hadid Architects’ Olympic stadium in Tokyo, Japan, is to begin in October, after the Japanese government confirmed the final details of the project.

It will now cost US$2bn (€1.8bn, £1.3bn) to build – almost double the original estimate. Work is scheduled to be completed a few months later than planned, in May 2019, but still in time for the Rugby World Cup due to be held in Japan.

Japanese sports minister Hakubun Shimomura’s announcement also confirms that the stadium will not be redesigned, despite some local criticism.

The 80,000-capacity venue will become the country’s national stadium and will be the centrepiece of the 2020 Olympic Games.

London-based Zaha Hadid Architects said the stadium had been designed so its arched roof could be built in parallel with the stadium seating bowl, which will save time in construction.

According to the architect, the stadium is intended to be an “urban connector” that will become part of the city’s fabric. Elevated ground connections govern the flow of people through the site, “effectively carving the geometric forms of the building”.