Extending walls beyond the roof?!

In terms of the amount of rainfall, it is identical to a flat roof. The drainage would have to be carried out on the inside of the eaves sides, that is correct. The flow velocity naturally increases with the roof pitch. Unfortunately, I have already received a refusal from the authorities to go below 15 degrees, because the development plan has already been reduced from 35 to 15 degrees and therefore sufficient scope for design would exist. The building authority, the municipal council, and also the building committee have all independently made the same decision, unfortunately. I have been trying to get this approved for 9 months now. I could now go for a hip roof with 15 degrees and would, let's say, see less roof. However, with the 5.5 m wall height, I cannot realize 2 full floors without roof slopes. That is really very frustrating. I just can't understand that for a shed roof you are allowed 7.5 m up to the eaves and for the other roof types only 5.5 m. If for the shed roof the eaves on both sides were meant, I would understand that. However, a house was approved there with a wall height of 6 m on the low side and 9 m on the high side of a 15 degree shed roof. Strange.

I can return the property to the municipality at any time for the original purchase price. That should not be an issue. However, there are family and professional reasons why this building area was chosen and is suitable for our construction wishes.

The drawing does not correspond to our plans at all; it merely illustrates the way of thinking.

, regarding the property, I agree with you

, is there perhaps a possibility to combine a shed roof and a flat roof? Just google "shed and flat roof" and take a look at the pictures. Whether this meets the requirements of the development plan can possibly be told to you by the building authority, your architect, or – if you post the exact wording of the development plan here – also by one of the experienced users here.

Excerpt from the development plan:
1. Type and extent of structural use
WA General residential area § 4 Land Use Ordinance
Floor area ratio = maximum permissible floor area ratio WA = 0.35
Plot ratio = maximum permissible plot ratio WA = 0.7
II = maximum number of full floors
Wall height (WH) = max. 5.50 m for buildings with gable and hip roofs
Wall height (WH) = max. 7.50 m for buildings with monopitch roofs
Reference point is always the natural ground level on the valley-side edge of the house up to the intersection of the outer wall with the roof covering, measured on the eaves side
Building height (GH) = max. 10 m above the top edge of the ground floor slab
.
.
.
5. Roofs of the main buildings
All roof types are permitted
Roof pitch 15° to 48°
______________________________________________

I would suspect that the building authority is messing with you. I am even unsure whether a split shed roof is permitted - I think the 7.5 m refers to a standard shed roof and the 7.5 is the high wall - of course, I don't know. I also find the snow load interesting.

Yes, the thing with the bird could definitely be true, however, in theory it would comply with the development plan.

So with a normal shed roof, it is definitely the short wall. Otherwise, my neighbor would not have been allowed to build his house as it stands now. As already mentioned, he built the short side at 6m and the long side at 9m. That is what I simply cannot understand about the development plan. Because in this way, you can easily build a house with 2 full floors without a sloping roof, which is not possible with a gable or hip roof.

The snow load would be the same in total amount as with a flat roof, since the surface that is cleared from the top is the same. However, it would clearly shift somewhat to the outer sides when the snow slides. The amount remains the same though.

I am a bit frustrated because at the beginning a solution regarding the flat roof was verbally promised to us and this was not implemented afterward. That is why I also have a bit of the urge to achieve the appearance anyway, while complying with the development plan. Something like: Now I’ll show you even more.