#28863
Sir Humphrey
Strataguru

    If they are appearing from under the floor, perhaps there is a nest in the sub-floor area. Some species that are capable of doing serious damage have an obvious nest mound and so are usually not a problem because the mound is noticed and destroyed. Sometimes a mound from such species will start in a sub-floor area and can develop to threaten structural timbers if it goes unnoticed due to a lack of inspections. 

    Leaky pipes or shower recesses can encourage termites since they need a source of moisture. 

    They can also start a nest in a wall cavity. 

    If they are not just generally flying about outside and some getting in, but rather seem to be coming from in or under the house, then certainly you should alert the owner.