The land available for housing corresponds to all the vacant land within the residential areas and to 75% of vacant land within the mixed-used areas in the municipalities' general land use plans (PAG) (in hectares). This is a theoretical potential, independently of the will of the owners to develop the land. The data sources are the digitalized cadastral parcels and the orthophoto-images from the "Administration du Cadastre et de la Topographie", as well as the PAG and PAP of the municipalities digitalized in collaboration with the Ministry of Interior.

The land area used for residential production corresponds to the land plots which were vacant at the beginning of the observation period and on which stood a building at the end of the observation period within the residential and the mixed-used areas in the municipalities' general land use plans (PAG). Thus, only the areas on which a building was constructed (regardless of whether it includes dwellings or not) are taken into account in the land consumption, without considering the plots on which roads, car parks etc. were build. These areas were captured by comparing the orthophoto-images. The data sources are the digitalized cadastral parcels and the orthophoto-images from the "Administration du Cadastre et de la Topographie", as well as the PAG of the municipalities.

The land available for housing by type of owner corresponds to all the vacant land within the residential areas and to 75% of vacant land within the mixed-used areas in the municipalities' general land use plans (PAG) (in hectares). The type of owners are on the one hand private owners (individuals, legal entities, co-ownerships) and on the other hand public actors (municipalities, State, Funds, SNHBM). This is a theoretical potential, independently of the will of the owners to develop the land. The data sources are the digitalized cadastral parcels, the orthophoto-images and the type of owner from the "Administration du Cadastre et de la Topographie", as well as the PAG and PAP of the municipalities digitalized in collaboration with the Ministry of Interior.