Flooring is the part of a job people think least about beforehand and notice most afterwards, and in Daventry the answer depends on which half of the town you are in.
The estate housing from the 1960s onward has solid ground floors, and there the questions are flatness and moisture rather than ventilation. Most of these floors need levelling before a hard covering goes down. A floor out by a few millimetres over a couple of metres looks perfectly fine to the eye and shows badly in large format tile or engineered board, and levelling it properly is the difference between a floor that looks right and one that never quite does.
In the older core there are suspended timber ground floors over ventilated voids. The air bricks feeding those voids are doing a job, and the number that have been rendered over, planted in front of or built up against by a later extension is remarkable. Block the ventilation and the void stops breathing and the joist ends begin to go. We check before laying anything, because a beautiful floor over a rotting one is a waste of your money.
Timber needs to acclimatise in the house before it is fixed, particularly in an older building with more seasonal movement. We allow for that in the programme rather than fitting boards out of the van on the day they arrive. Our flooring page covers the coverings and the preparation under them.