ᐅ Eaves height 3 meters: Is a 1.5-story single-family house possible with this?

We have 400 sqm (4,300 sq ft) available in one of our dream locations. About 250 sqm (2,690 sq ft) can be built on within the building boundary. I tried to illustrate this:

The development plan states:

Floor area ratio = 0.4, gable roof mandatory

If I understand the eaves height correctly, the roof must sit almost directly on top of the floor ceiling at a story height of 2.5 m (8 ft 2 in) to reach an eaves height of 3.0 m (9 ft 10 in). There can’t be more than about 30 cm (12 in) of knee wall, right?

Does this still allow for a 1.5-story single-family house? We would actually prefer one of the typical modular house designs with a maximum footprint of 8 x 10 m (26 x 33 ft) (located close to the street access, with a large garden on the west side). But how does this work regarding the attic under these conditions?

What do you think?

Best regards,
Jens

This is an explanation of the symbols in the plan with sample numbers. An eaves height of 3.0 m (10 feet) would practically mean a roof with a knee wall height of "zero" and require a plot as flat as a pancake (unless the measurement is taken from the top edge of the ground floor slab and a base plinth is allowed).

A "knee wall" of 30 cm (12 inches) in such extremely rare cases—for example, if the Pope turned Protestant—does exist in development plans, seriously. Of course, a reasonable person—though they unfortunately do not write regulations—knows that a knee wall is meant to avoid having a low wall under the roof slope (a sloping wall); therefore, a knee wall at dachshund-knee height is complete nonsense.

For a one-and-a-half-story house, it might still be sufficient, but then the attic floor actually becomes literally only "half." Which roof pitches are permitted?

By the way, I don’t believe in zero setback from the road; in the drawings, the building envelope setbacks to neighboring properties are simply not shown separately. The regional building code / planning permission regulations will apply in these cases.

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I’m afraid these are not example figures; this is exactly how it appears in the plan itself:

Yes, that actually applies to this building plot. But it is feasible. For example, a 45° pitched roof would allow for a house depth of up to 11m (36 feet).

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Yes, up to 45° is possible. An 11m (36 ft) house depth (width?) would then make full use of the ridge height, 5.50m (18 ft) above the eaves height. That’s almost two full floors under the roof.
Who comes up with these ideas, shaking my head.

AnsorgJ schrieb:
Yes, up to 45° is possible. 11 m (36 ft) house depth (width?) would then fully utilize the ridge height, 5.50 m (18 ft) above the eaves height?

That was exactly my sample calculation: ridge height 8.50 m (28 ft) minus eaves height 3.00 m (10 ft) = difference 5.50 m (18 ft) = with a symmetrical gable roof pitched at 45°, 11.00 m (36 ft) house depth. I could also have said 19 m (62 ft) at 30°. Taking your 12.57 m (41 ft) as an example, at 35° pitch this corresponds to about 7.40 m (24 ft) ridge height. Or 8.00 m (26 ft) at 38° pitch corresponds to about 7.13 m (23 ft) ridge height.

The last example would give you about 1.28 m (4 ft) from the eaves to 1.00 m (3 ft) height, and after 2.56 m (8 ft) you would reach 2.00 m (7 ft) height. This means you’d effectively have a 1.44-story building. With an 8 by 10 m (26 by 33 ft) footprint, you would achieve roughly 92 sqm (990 sq ft) of living space. In that respect, I see somewhat less modesty in the floor area, and probably around 40° roof pitch.

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