I am still dealing with the topic of roof renovation late at night. The roof is 60 years old, so it should/must be renewed in the foreseeable future depending on its condition (which still needs to be determined).
For roof renovation on existing buildings in BW, the photovoltaic obligation now applies, which would require additional capital. Out of interest, I have studied the practical guide.
The ridge of the roof runs almost perfectly east-west, meaning only the south side would be suitable according to the guide. Now, a contiguous minimum area of 20 sqm must be met. I don’t know how large the south side of the roof is, but let’s assume it is 20 sqm.
I became alert at point 7.4 – no use opposing solar utilization. There is a roof bracket for an overhead line as well as 2 roof windows on the roof. For the roof bracket, paths and distances must be observed, and the roof windows further reduce the sqm of solar-suitable areas.
The following is available for the calculation:
The remaining area is considered suitable for solar use and must be multiplied by a factor of 0.75 to obtain the required minimum solar module area, which must be installed according to PVPf-VO
I understand this (as a layman) to mean that the remaining area is multiplied by 0.75. If at least 20 sqm do not result here, the photovoltaic obligation is waived. Is my understanding correct?
Long story short: I assume, based on the house’s base area, the roof orientation, and the above-mentioned "obstacles" on the south side, that I will not reach the 20 sqm and the photovoltaic obligation will be waived. This would also explain why the neighbor has new dormers but no photovoltaic system on the roof. He also has a roof bracket standing on the roof.