ᐅ Is a stepped upper floor permitted if the development plan requires a flat roof?

Hausbauer1 schrieb:
When the development plan states "II FD"

If the Roman numeral two is circled, it is a mandatory regulation according to the building symbols directive, meaning the building must have two stories. A recessed top floor (also called a setback floor) would only be possible under the conditions mentioned by Yvonne in #7. Otherwise, it represents a maximum limit, so it is also allowed to build a single-story building or with a recessed floor of any smaller size.

Hausbauer1 schrieb:
Up to what pitch is a roof considered flat?

I am not aware of any legal regulation, neither at the federal nor at the state level. The legislators probably want to leave room for discretion to the permitting authorities. Like @11ant, I would consider 10° to be the limit, but in case of disagreement with the building department, a court would have to decide on a case-by-case basis.

Escroda schrieb:
The legislator probably intends to give the permitting authorities some discretion. Like @11ant, I would set the limit at 10° (10 degrees), but in case of disagreement with the building authority, a court would ultimately have to decide on a case-by-case basis.

I hope the municipality clarifies in the written regulations how it interprets the term.

Escroda schrieb:
If the Roman numeral two is circled, according to the planning symbols regulation this is a mandatory requirement, meaning the building must have two full storeys.

I believe the original poster is asking whether "two full storeys"—regardless of the "yardstick" used in the respective state building code’s definition of a full storey—usually means that a third storey is allowed, but only “smaller,” and in the case of a flat roof in accordance with the development plan, also permits a "third" storey with a flat top. In other words, whether a flat-roofed recessed storey can be considered equivalent to an attic storey under a pitched roof.

On this, I said:
-firstly: basically "yes," with the note that due to the flat roof characteristic of the eaves height being almost equal to the ridge height, the eaves height restriction is the critical point;
-and secondly: that the relationship between the site coverage ratio and the floor area ratio sometimes provides the answer. For example, a ratio of 0.2 to 0.5 suggests that the "remainder" of 0.1 can be used for a half-sized attic storey; whereas with a ratio of 0.2 to 0.4, a remainder for more than two storeys only results if the site coverage ratio is not fully exploited.

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11ant schrieb:
I hope that the local authority provides a clear explanation in the written regulations on how they interpret the term.

That would be desirable, but I have never seen it.

11ant schrieb:
0.2 compared to 0.5 suggests that the "remainder" of 0.1 could be used for a half-height attic

This assumes that the development plan explicitly requires calculating non-full storeys or that the development plan is older than 27 years. Otherwise, the floor area ratio is calculated only for full storeys.
As is often the case, a section of the development plan and the written regulations would be very helpful.

Escroda schrieb:
That would be desirable, but I have never read that before.

I can’t say exactly where. But to my recollection, it was in a local development plan I looked at within the last two months because of a related thread here. It mentioned something about pitched roofs up to 10° roof pitch (10°) being considered flat roofs. I think it even stated, without further conditions, that with a parapet they must appear completely horizontal. However, yes, you rarely see that written down. On the other hand, recently it has become more common to see very detailed lists of permitted types of front yard shrubs. It seems that some municipal administrations even have special “breakfast managers” for that.

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