Several European municipalities developed an information map called solar cadaster that provide qualitative information for the citizens about the possible locations and amount of the small scale household solar PV system installations. The objective of these cadasters is the promotion and fostering of the distribution of the PV systems. Most of the cadasters are based on remote sensing roof measurements and irradiation information but provide only indicative data. Our solution is based on ten implementation type categories such as individual small houses, housing estates, solar carports, public institutions, etc. We looked for which segment of the solutions can raise the penetration with greater efficiency. We found that in Budapest there are eight large 10 storeys block-type housing estates with 100 thousand flats. Here 20-40 kWp can be installed for each staircase that is about 300-600 MWp for 1500 staircase. The total additive PV potential in Budapest is 1500 MW.