Demand for larger houses has risen strongly over the past twelve months as more families choose "generational" holidays, with grandparents, children and grandchildren staying in the same holiday property. The demand for larger homes from holidaymakers wanting to do the same means investors have also become more interested in more spacious properties. Illustrating this trend, sales of newly-developed three-bedroom houses by Knight Frank in the South West trebled in the year to June, compared to the previous 12 months.