Upper floor usable as living space according to the development plan - experiences?

Hello,

my name is Carla and I am completely new here. My boyfriend and I have just purchased a plot of land and are now starting the initial planning for the house. Due to the development plan, we are currently wondering whether we are allowed to build an upper floor or not. Here are the facts from the plan:

Plot: 2000sqm
Floor area ratio: 0.3
Floor space index: 0.3
Number of floors: 1 full floor
Eaves height: 4m
Ridge height: 9m
Roof pitch: 25-50%
Construction site: Niedersachsen

We already understand that we cannot build an upper floor that is not limited by the roof. But is it possible with sloping roofs and also sensible to use as living space? And how can this be calculated based on different roof pitches and house floor area? Our heads are spinning :D

Thanks a lot in advance :)
Best regards, Carla

A full storey is an above-ground storey that has a clear height of 2.20 m or more over at least half of its floor area. 2 A top storey is only considered a full storey if it has the clear height mentioned in sentence 1 over more than two-thirds of the floor area of the storey below.

I assume this concerns a classic gable roof, i.e. you need to draw this in section and either make the roof pitch steeper or lower the knee wall until less than 67% of the area has a clear height of 2.20 m, so that the upper storey just does not count as a full storey.

Purely in terms of eaves height, it will be about a 1 m knee wall and then continue with a suitable roof pitch up to the maximum ridge height. Yes, this leaves a normal living storey in the roof. And depending on the house size (ridge length side) there may also be an attic above as storage space.

If necessary, dormers and gable windows can be used to create additional space in the upper storey without violating the development plan.

Edit: the floor area ratio etc. will only become an issue with larger houses on your plot size, but that is still the simplest calculation task in your planning.

Completely normal gable roof house works

Thank you very much for the answers :) Then we don't have to limit ourselves to a bungalow after all.