ᐅ New Basement Beneath the Foundation of an Existing House

Created on: 7 Dec 2021 21:59
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Chris-Cross
Hello everyone,
I’m new here and have a feasibility question. It concerns a house that already has a basement and a foundation about 1 meter (3 feet) thick. The house was built in 1964. My question is whether it would be possible to expand the basement below this building, more specifically beneath the foundation (which I think is a better option than breaking up the foundation), potentially adding two underground levels. At the rear, there is plenty of green space adjacent to the property, and behind that are houses we also own and rent out. If this is possible, how would you estimate the costs?
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Benutzer200
8 Dec 2021 22:54
Chris-Cross schrieb:

If not everything is going to be built under (I deny that, since that would also destroy the root system, and there are a lot of beautiful fruit trees), but about 40 - 60%

And who is supposed to grant a building permit / planning permission for that? I’m just reluctantly bringing you back to reality...
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Chris-Cross
8 Dec 2021 22:59
Setting aside the section beneath the existing house, the part in the garden shouldn't be a problem, right?
11ant8 Dec 2021 23:14
I have two quick questions for you:
1) How old are you?
2) What do you smoke?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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Chris-Cross
9 Dec 2021 01:28
11ant schrieb:

I have two quick questions for you:
1) How old are you?
2) What do you smoke?

Can't you answer normally, or what?
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Benutzer200
9 Dec 2021 10:09
Chris-Cross schrieb:

Setting aside the part beneath the existing house, the section in the garden shouldn’t be a problem, right?
11ant schrieb:

I have two quick questions:
1) How old are you?
2) What are you smoking?

Both posts belong together. Of course, you need a building permit / planning permission for a basement level. And of course, the basement (= underground structures) counts towards the floor area ratio. So the clear answer to your question is: It will never work.

See building use ordinance § 19
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Myrna_Loy
9 Dec 2021 10:18
Benutzer200 schrieb:

Both posts are related. Of course, you need a building permit / planning permission for a basement level. And naturally, the basement (= underground structures) counts toward the floor area ratio. Therefore, the clear answer to your question is: it will never work.

See Building Use Ordinance § 19
Maybe one of the James Bond supervillains can recommend their planners – they somehow manage to turn entire volcanic islands into world-destroying factories without anyone noticing. 😉