We are planning an extension to an existing building and intend to partially basement this extension. The footprint of the extension is 45 m² (484 ft²), with about 35 m² (377 ft²) planned to be basements. Excavation would not be directly against the existing building’s exterior wall, but approximately 2 m (6.5 ft) away from it. We hope this will simplify the underpinning and keep costs manageable.
We plan a simple utility basement for storage and a workshop. A waterproof concrete box structure (white tank method), fully underground, unheated, uninsulated, with access from both inside the building and outside, and one basement window at the exterior basement entrance. No interior plastering required, no water connection needed, only electrical wiring. A screed floor will be sufficient. It doesn’t need to be finished nicely, just functional. What approximate costs should we expect (excluding earthworks)? Unfortunately, we have no idea.
We plan a simple utility basement for storage and a workshop. A waterproof concrete box structure (white tank method), fully underground, unheated, uninsulated, with access from both inside the building and outside, and one basement window at the exterior basement entrance. No interior plastering required, no water connection needed, only electrical wiring. A screed floor will be sufficient. It doesn’t need to be finished nicely, just functional. What approximate costs should we expect (excluding earthworks)? Unfortunately, we have no idea.
ruby27 schrieb:
We are planning to extend an existing building and partially create a basement under the extension. The footprint of the extension is 45 sqm (484 sq ft), with about 35 sqm (377 sq ft) intended to be basement area. Segmental solutions are not suitable; consider the future building as a whole. Start with a thorough assessment of the existing structure.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Okay, thank you very much for the response. I also read that a partial basement isn’t really cheaper than a full basement. However, I keep seeing advice that you should avoid digging directly next to the existing building if possible. But as a layperson, I guess it’s really hard to judge that. I have no idea what technical aspects need to be considered when building a basement. That’s what a professional company is for, after all.
Has anyone here recently built a basement and would like to share their experience? Even if it’s not a directly comparable basement. Just out of interest and for the sake of exchanging information.
Has anyone here recently built a basement and would like to share their experience? Even if it’s not a directly comparable basement. Just out of interest and for the sake of exchanging information.
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hanghaus202313 Mar 2024 10:56Very roughly without a plan, about 70,000. The waterproof concrete basement ("Weisse Wanne") makes it very expensive.
Does the existing house have a basement?
Does the existing house have a basement?
ruby27 schrieb:
I also read that a partial basement isn’t actually much cheaper than a full basement.Yes, see the second 11ant basement rule in "Partial basement: The solution between yes and no?".ruby27 schrieb:
However, I also see everywhere that you should avoid digging directly next to the existing building? But well, as a layperson, you probably can’t really judge that. I have no idea what technical aspects need to be considered when building a basement. That’s what a company does.The excavator digs and scoops, the architect plans. Your idea that a two-meter (6.5 feet) clearance would protect the ground is very naive. This would only cause the disadvantage of not connecting the entire building in the basement and requiring a second basement staircase.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
I had also expected around 70k. The existing building has a partial basement, but only at the front. There is a small cellar room of about 12 sqm (house dates from 1900). There is no staircase down, just a hatch in the floor from the current kitchen, accessed by a ladder. We would not use this old basement at all.
We plan to build an extension at the rear, including a basement, about 8 meters (26 feet) away from the current basement. We do not have a soil survey. Therefore, I initially assumed the worst (i.e., the most expensive) scenario and budgeted for a waterproof concrete shell (“white tank”). Maybe we won’t need it. It is not intended to be a living basement.
We plan to build an extension at the rear, including a basement, about 8 meters (26 feet) away from the current basement. We do not have a soil survey. Therefore, I initially assumed the worst (i.e., the most expensive) scenario and budgeted for a waterproof concrete shell (“white tank”). Maybe we won’t need it. It is not intended to be a living basement.
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