We are having an extension built. We have a choice for the ground floor to be constructed by having a concrete slab or a wooden floor, using joists with an air gap. A couple of the builders have recommended the wooden floor as it will aid in routing the services i.e. radiator pipes etc The builders have said that the floor covering will be made of chipboard with a laminate flooring as a finished surface. What would opinions be of fitting floorboards instead of the chipboard and then having the floorboards as the finished surface. What would be the pros and cons of this ?