Countryside made the prediction after it posted pre-tax profit of £12.2m for the six months to 31 March, up 19% on the same time last year. Turnover increased 26% to £160.4m.
Countryside is one of the few housebuilders to increase sales after poor weather and planning restrictions hit many other firms' completion rates.
Chief executive Graham Cherry said the housing market was set for continued growth. He said: "The recent reductions in interest rates should help to maintain a relatively buoyant housing market."
The group's average selling price also increased, up £2000 to £233,000.