The firm said that including public sector homes overall reservations were ahead 9% from the start of February to the end of May.
Bellway said it would now meets its target of 5% volume growth at the end of the year, subject to build delivery, which would see an extra 300 homes built in the year ending 31 July.
In addition, some 1,600 reservations have been taken for completion in 2012/13.
The average selling price on reserved houses since the beginning of February is £190.400, up 5% year-on-year.
The rise is largely down to a combination of more up-market units being sold in the London market, and a greater proportion of private reservations.
Operating margins continued to improve, and Bellway said expects to produce an operating margin of at least 11% for the full year.