Construction company Yau Lee Holdings said profit margins more than doubled this year, due to increased airport and hospital authority projects. Company vice-chairman Wong Tin-cheung said yesterday margins had improved from less than 1 per cent last year to more than 2 per cent this year, with growth expected to continue. 'While the airport is almost finished, we have been able to win more hospital contracts,' he said. He said that 40 per cent of the company's $3.5 billion in contracts on hand were hospital projects. Mr Wong said the company recently secured a $408 million contract for the construction of the Kowloon Medical Rehabilitation Centre and a $761 million contract for a Fanling public housing development. More than 90 per cent of Yau Lee's turnover last year was for government projects, Mr Wong said. The company was tendering for the $480 million Stanley Ma Hang public housing development and was expected to win as it had the lowest bid, he said.