ᐅ Demolition / New Construction / Renovation / Building on Existing Basement – Ideas & Experiences?
Created on: 15 Oct 2021 17:45
F
Franzbrot
As I have mentioned in several places, we purchased a plot with a small settlement house (semi-detached house) from the 1950s on it.
The house is about 90 m2 (970 ft2) in size and is presumably partially basemented.
The other semi-detached house, to which we also need to extend, does not have a basement.
This means that if we demolish the basement, we would probably (?) have to carry out underpinning, which sounds costly and not entirely straightforward.
Therefore, we have now considered whether it might be "easier" to only demolish the house but keep the basement and build a new structure on top of it.
Alternatively, we could renovate the old house and add an extension (although this might again cause issues due to different settlement behavior?).
We would not build only on the basement area or the current house footprint, but want to expand significantly overall (approximately 200 m2 (2,150 ft2)).
So now my question is about experiences with building larger on an old basement?
Has anyone done this here? Is it even possible?
Is there any other option besides having to do underpinning when demolishing? (I originally thought that you could simply fill in the basement, but apparently that is not possible (?)
The house is about 90 m2 (970 ft2) in size and is presumably partially basemented.
The other semi-detached house, to which we also need to extend, does not have a basement.
This means that if we demolish the basement, we would probably (?) have to carry out underpinning, which sounds costly and not entirely straightforward.
Therefore, we have now considered whether it might be "easier" to only demolish the house but keep the basement and build a new structure on top of it.
Alternatively, we could renovate the old house and add an extension (although this might again cause issues due to different settlement behavior?).
We would not build only on the basement area or the current house footprint, but want to expand significantly overall (approximately 200 m2 (2,150 ft2)).
So now my question is about experiences with building larger on an old basement?
Has anyone done this here? Is it even possible?
Is there any other option besides having to do underpinning when demolishing? (I originally thought that you could simply fill in the basement, but apparently that is not possible (?)
N
Nice-Nofret15 Oct 2021 17:52I would advise against expanding on a basement or concrete slab from the 1950s – the masonry, foundations, and structural stability are unlikely to meet current standards.
Franzbrot schrieb:
As I have mentioned in several places, we purchased a plot with a small settlement house (semi-detached house) from the 1950s.
The house is about 90 m2 (970 sq ft) in size and is (presumably) partially basemented. Have we anywhere—in https://www.hausbau-forum.de/threads/grenzbebauung-anbauverpflichtung.41484/ unfortunately not yet—in plan and picture discussed the situation?
How can a house be "presumably" partially basemented—are you not brave enough to go down into the basement?
Nice-Nofret schrieb:
I would advise against building larger on a basement or slab from the 1950s—the masonry, foundations, and structural design probably do not meet today's requirements. I don’t quite share that view. While I am not formally an engineer, I wouldn’t dismiss it outright from the start. Seeing begins with looking; that can clear some of the fog. Without ruling it out, I think a clever solution for an extension that is structurally flexible could be found.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
11ant schrieb:
Have we anywhere – unfortunately not yet – discussed the situation with plans and pictures in https://www.hausbau-forum.de/threads/grenzbebauung-anbauverpflichtung.41484/?
How can a house be "presumably" partially basemented – are you afraid to go down into the basement?😀
Oh no, not at all.
But I wouldn’t bet my life on the property having no surprises left to discover.
From a visual inspection, it looks like it has a partial basement.
That means the basement probably does not directly border the neighbor’s house (foundation).
11ant schrieb:
I don’t see it that way. While I’m not formally an engineer, I wouldn’t dismiss it out of hand. Seeing starts with really looking, and that can clear up some uncertainties. I wouldn’t want to rule out, without further inspection, finding a clever solution for an encroachment that would be structurally sound. That sounds somewhat positive.
We will review the building records next week. Until then, I only have photos of the exterior of the property, which I don’t think will be very helpful?
Franzbrot schrieb:
At first glance, it appears to have a partial basement.
That means the basement probably does not share a wall directly with the neighboring house’s foundation. So you’ve been in the basement, but without a tape measure; and/or you’re not fully sure...
Franzbrot schrieb:
But I wouldn’t bet my life on the property not revealing any surprises. ... whether an apparent exterior wall might actually be just infilled framing or even hide a secret passage to the nearest Edgar Wallace-style mansion?
Franzbrot schrieb:
We will review the building records next week. Until then, I only have photos of the exterior, which I don’t think will be very helpful? The chance that these photos won’t help at all is quite low.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/