In Brussels the municipalities of Ukkel, Sint-Agatha-Berchem and Evere have written to thousands of proprietors requesting an explanation. Official records often show that these properties lack even the most basic facilities. Investments on a new bathroom or on the heating system have to be notified to the authorities. In Flanders too many municipalities are looking into this matter.
For Flemish municipalities income from the property tax can be as much as a quarter of their total revenue. Today fewer building licences are required and as a result municipalities are struggling to establish what work has been carried out.