Boundary construction double garage/carport 6x9m Lower Saxony

So I understand it correctly that 9m per side are allowed, so an FG with 9x6m in the corner of the property (one side 9m, the other side 6m boundary construction) is allowed? That fits...

No, that is not what is meant. 9 meters of permitted boundary construction applies in total. In one corner it would be 15 meters

No. In many state regulations, 15m TOTAL applies, but a maximum of 9m to ONE boundary.

9m*6m is therefore possible, beyond that you usually need easements.

Regards
Dirk Grafe

Quotation Lower Saxony Building Code 2012, §5 (8) sentence 2:

2 Without distance or with a distance reduced to 1 m from the boundary are permitted

1. Garages and buildings without rooms for occupancy and fireplaces with a height of up to 3 m [...]

3 Structural installations according to sentence 2 may underrun the distance according to paragraph 2 on a total length of 9 m per property boundary, but on a building plot overall only on a length of 15 m.