Building footprint of the house within the construction window

Hello forum,

First of all: The problem I am about to describe is very annoying but probably due to our inexperience.

We have bought a plot with a specified building envelope. The envelope is relatively large. However, we overlooked that the shape is rather unfavorable. We had everything checked in advance, but we actually missed this point.

We are planning a townhouse with a living area of 180m² ([Wohnflächenverordnung]). The floor area is intended to be square. Due to the curved shape of the building envelope, the architects said that it would probably not be possible to achieve the entire living area as planned.

There is the possibility to apply to slightly exceed the building envelope. Then we would also get the 180m².

I now have the following question: I assume that a floor area of 100m² (i.e., 10 x 10 m) should be sufficient for 90m² downstairs and 90m² upstairs as living space. Is my assumption wrong? (I have also tried to consider the exterior wall thicknesses for WDVS)

Furthermore, does anyone have experience regarding how far one is allowed to change or exceed the building envelope? Our plot is relatively large (856m²) and we would like to "move" the house in the direction outside of the building envelope where we have no neighbors (footpath). The distance to the footpath would still be quite large. See photo.

What is your opinion on this? We are really perplexed and know that it's our own fault, but is the situation really hopeless?
Looking forward to your feedback

One more thing, the site plan has a scale of 1:500 therefore 2cm edge length of the square corresponds to 10m of the house

With 10 x 10 you won't reach 90 sqm

Question 1: Do you already have a 10 x 10 floor plan in mind? If that is enough and appealing to you, it doesn't matter whether it is called 160sqm or 165sqm or 180sqm. Does it really have to be at least 180sqm????

Question 2: why don't you rotate the house a bit to the left (counterclockwise), then an estimated and conveyed 11 x 11 house should also fit (if I looked correctly)?!

Hello ypg

Answer 1: Basically, I do think it is important whether you have 160 or 180m² of living space with the same layout, hence the fixation on 180m²

Answer 2: We did not rotate the house because we want to have the garage/carport on the left, so to speak. However, that would certainly still be an option if you want to place it there

Hi HausbauBlog

thanks for the tip, but I can't really imagine what "versetzt" means? maybe a picture or a link?

Basically, another question: do you have any experience with how much the building envelope can be changed?

A building envelope is not changeable, but a corner protruding is possible (as long as the building authority is in a good mood!)

I asked about the floor area because many people fixate too much on a number (which they casually added up per room or find another property with x sqm too small), although with intelligent layouts, the perceived sqm often represent added value, rather than real sqm with lots of unnecessary space (e.g. corridors of 15%)
Besides, you have a 10x10 idea, in my opinion you haven't really thought much about it yet