Mr. Patrick Davitt:

Many of these sites are vacant as opposed to derelict sites. They are brownfield or greenfield sites which can be built on very quickly. House prices go up because of site values. The only difference in the cost of building between Dublin and a place like Sligo or Longford is the site value. If sites in Dublin are very expensive and increasing all the time due to demand and speculators get into the market, the cost of the house at the end will go up. If speculators are not involved in sales and it is only builders, site values will be kept at the right price.