CROWNHAMPTON International yesterday reported a 28.5 per cent rise in profit to $14.6 million for the six months ended December 31. Earnings per share were 4.4 cents against 3.5 cents for the same period in 1991. No interim dividend was recommended. Despite a tight labour market, the company said its Singapore construction and equipment rental division had continued to benefit from lower material prices and managed to increase its contribution. Its contract mining operations had improved through increased export volume and tighter cost control.