An example of invisible defects is home hygiene. According to the tenants' association, at least every 5th apartment is infested with mold somewhere, every 10th even in a health-damaging stage. This is often not visible. Mold is only too happy to be “washed off” quickly before handover or covered with paint - it is not recognized behind boxes and kitchen fittings anyway. For people with high blood pressure, breathing difficulties or allergy sufferers, the hidden spores represent a not inconsiderable health risk.
The situation is similar for germs in the water. The harmful, or shall we at least not exactly health-promoting, little culprits are all too invisible. In truth, these are not only invisible, but also cannot be removed sustainably with conventionally keeping the apartment clean. Quite a few Austrians move joyfully into their new home year after year - without really knowing the hygienic condition of the new home. If at all, they only discover the hidden defects months after the takeover and make every effort to eliminate them in the long term.We belong to one of the richest countries in the world and our food is certified and precisely labeled. The products that we otherwise procure and use for our everyday lives have also been tested and require our own approvals. This is not the case with the places where we spend a large part of our time - neither in our offices nor in the rooms in which we sleep, eat and play with our children, we can be sure of hygiene that meets our standards. I would therefore find a hygienic purchase test for residential and office properties - perhaps even with a 2-year repetition, sometimes more useful than an energy certificate (the consequences of which can at least be seen visibly on the heating bill).