The age of the construction is an indication of the regulations (or not) in force when constructed. A habitation licence is granted if the house is old or conforms to the regulations when constructed. The "land registry" which your lawyer should be able to access and print off the article numbers you are interested in will give you all the available details, later houses need to have listed all the significant work and who did what, builders are registered here so only a registered ie qualified builder may do certain work and it is recorded on the paperwork . If a construction or significant rebuild is recent then the "local council" would need to have issued it as a "project" and this is also available. If, however, the building is older then it is granted a habitation license irrespective of how it was built, the majority of older country buildings inland from Caldas use field stone (stones from a field) with mud infill/pointing then later on lime mortar infill/pointing and usually no foundations. Traditional roof is ridge - load beam from gable end to gable end and untreated wood from beam to outer wall with tiles on top and no board or felt. The room ceilings are wood and sealed to keep the "attic space" vented to the outside but not he inside, so often there is no access to the attic space so no way of looking at the underside of the roof construction.