18 A migrant workers dormitory in Bang Chalong market, Bang Phli district, Samut Prakan on Sunday following the announcement of lockdown measures on construction sites and worker camps in Greater Bangkok. Wichan Charoenkiatpakul The 30-day temporary lockdown of all construction sites and worker camps in Greater Bangkok will cost 140 billion baht and have a ripple effect across all supply chains in the construction and property sector with unpredictable losses. Sarun Rojlertjanya, deputy secretary-general of the Thai Contractors Association, said losses from the abrupt lockdown order in the construction sector would be larger than the value it contributed to gross domestic production.