According to the development plan, 2 full floors but only 3.8m height.

But according to this reasoning, wouldn't every habitable floor then be a full floor, since it must have this minimum ceiling height?

PS: Dangerous half-knowledge on my part.

Hello everyone,

I can understand the OP's confusion. As far as I have read correctly, in NRW a full floor is reached at a height of 2.30 m. Thus, two full floors would roughly be UG + 2.30. According to the development plan, however, a maximum eaves height of 3.80 is allowed.

How does that work?

Building regulations NRW:
(5) Full floors are floors whose ceiling upper edge protrudes on average more than 1.60 m above the ground surface and which have a height of at least 2.30 m. A top floor (setback floor) recessed compared to the exterior walls of the building is only a full floor if it has this height over more than two thirds of the floor area of the floor below. A floor with sloping roof surfaces is a full floor if it has this height over more than three quarters of its floor area.

At an eaves height of 3.80 you have a proper knee wall, so that in connection with dormers in the attic you easily exceed 75% of the ground floor area. The 2.30 counts up to the outer edge of the roof. If your ground floor is 10m x 10m = 100 sqm in size, and the attic has more than 76 sqm with a height of at least 2.30 m, it is considered a full floor. If 25 sqm are below 2.30 m, then it is not a full floor.

Hello Your problem is familiar to us, we had the same, 2 full floors and fixed eaves height. Have a look around the area, are [Stadtvillen] also built there? That was the case with us, go to the building authority and the municipality and talk to them.

With a TH of 3.80 you can nicely let your full basement protrude about 160cm and then roof your ground floor.

Hello Your problem is familiar to us, we had the same, 2 full floors and a fixed eaves height. Take a look around the area, are there also urban villas built there? That was the case with us, go to the building authority and the municipality and talk to them.

Yes, there are some, but in their parcel there is also an eaves height >6m. But yes, I will follow up with the office to see what is possible.

Hello Then it doesn't look so bad for you at all. We have a parapet height increase of 1.50, which you can also have approved in advance at a municipal council meeting, as they have to give their consent. Once you have clarified this, the rest is just a matter of cost due to the deviation (increase) of the parapet height.