ᐅ Low ridge height results in a short knee wall.

I now have a land offer that seems quite suitable. However, the development plan states that the ridge height may only be 7.20 m (23.6 ft). Two apartments are permitted, which I would like to have. Building envelope is 17 x 14 m (56 x 46 ft). Since I want a ceiling height of 2.75 m (9 ft) on the ground floor, as well as underfloor heating, the height restriction means that I can only build a single-story house, and the second floor would not provide comfortable living space. The knee wall would start at around 1 m (3.3 ft)... which is quite impractical.

A gable roof and hip roof are allowed, with angles between 30 and 45 degrees.

Is there a program or an online tool where I can roughly calculate this? Thanks.

What do you want to calculate online? A pencil, graph paper, and a ruler are enough for that. Maybe also a formula book and a calculator...

ruedigold schrieb:

Is there a program or an online resource where you can do a rough calculation?

With a house depth of 14 m (46 feet) and a symmetrical gable roof with a 30° pitch, the roof height is 4.04 m (13.3 feet); this results in a knee wall ("Kniestock") of 41 cm (16 inches) minus the thickness of the ceiling, so essentially none or very little.

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11ant schrieb:

With a house depth of 14 m (46 feet) and a symmetrical gable roof with a 30° pitch, the roof height comes to 4.04 m (13 feet 3 inches); that means 41 cm (16 inches) minus the thickness of the ceiling as a knee wall, so more or less none.

Thank you very much, this is the information I expected—and feared. The development plan is very old; back then, the local authorities probably had no idea in which direction house design would evolve. Since I place great importance on high ceilings (atmosphere), underfloor heating, and want to achieve KFW 55 standard, the solution would probably have to be to maximize the floor area (full use of the building plot), and the knee wall floor is cramped and therefore unattractive. Someone said: it can’t really be more than a “settlement house” there.

I will now have a rough first architectural floor plan drawn up; if that doesn’t work, the plot is not suitable.

ruedigold schrieb:

Someone said: it can’t be more than a "small settlement house."

17 by 14 results in a tiny 238 sqm (2,562 sq ft) footprint, thus about 200 sqm (2,153 sq ft) of living space plus storage area in the attic.

nordanney schrieb:

17x14 results in a tiny 238 sqm (2,560 sq ft) of floor area,

ruedigold schrieb:

Someone said: it can’t be more than a "small settlement house."
I will now have a rough first architectural floor plan made; if that doesn’t work out, the plot is not suitable.

This "small settlement house" would already be the "economic miracle XXL" model for Ludwig Erhard personally.
And I wouldn’t even have a floor plan drafted for this assessment: a simple wireframe model is enough to calculate the possible areas and their heights.

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