Hello everyone,
I would appreciate your assessment on the following matter:
Basement dimensions: 8.16 x 9.99 meters (let’s say 8.20 x 10)
Excavation depth (see section): approximately 3 meters (10 feet)
In addition, the slope situation: I would say the basement extends about 1/3 above the existing ground level
Workspace allowance: 60 cm (2.4 inches)
Slope angle: According to the soil report, I assumed 60° (recommended between 60° and 80°)
All in all, I calculated an excavation volume of approximately 303 m³ (10,700 cubic feet). Are you getting similar numbers? Did I make a mistake somewhere?
I ask because our excavation contractor has quoted a solid 520 m³ (18,350 cubic feet). Unfortunately, I wasn’t able to reach him today to ask where this figure comes from.
Either I have made a significant error somewhere (which is why I am asking for your opinion) or there is something wrong with the quote.
Many thanks in advance!
I would appreciate your assessment on the following matter:
Basement dimensions: 8.16 x 9.99 meters (let’s say 8.20 x 10)
Excavation depth (see section): approximately 3 meters (10 feet)
In addition, the slope situation: I would say the basement extends about 1/3 above the existing ground level
Workspace allowance: 60 cm (2.4 inches)
Slope angle: According to the soil report, I assumed 60° (recommended between 60° and 80°)
All in all, I calculated an excavation volume of approximately 303 m³ (10,700 cubic feet). Are you getting similar numbers? Did I make a mistake somewhere?
I ask because our excavation contractor has quoted a solid 520 m³ (18,350 cubic feet). Unfortunately, I wasn’t able to reach him today to ask where this figure comes from.
Either I have made a significant error somewhere (which is why I am asking for your opinion) or there is something wrong with the quote.
Many thanks in advance!
Yes, excavation is always the biggest unknown in house construction, even with a soil report and all. At least, that’s what my experience and reading the forum here tell me.
We initially received a quote of over 50,000€ (about 54,000 USD), then one for 30,000€ (about 32,000 USD), and finally one for 16,500€ (about 17,700 USD).
In the end, we paid just under 18,000€ (about 19,300 USD) for everything. But at first, it was a shock for the budget calculation.
We initially received a quote of over 50,000€ (about 54,000 USD), then one for 30,000€ (about 32,000 USD), and finally one for 16,500€ (about 17,700 USD).
In the end, we paid just under 18,000€ (about 19,300 USD) for everything. But at first, it was a shock for the budget calculation.
Our structural contractor calculates a working space of 1.2m (4 feet) on each side.
So, it’s probably 11.2m x 9.6m x 3m = 325 cubic meters plus a buffer of 20 square meters, plus whatever extra volume results from the slope on your site. Then you also need to account for soil loosening, so multiply everything you calculate by 1.33. But it’s never possible to calculate this precisely. For example, at my neighbor’s site, they excavated an additional 70cm (28 inches) over 600 square meters without notice because the surveyor miscalculated to his disadvantage.
What I can tell you for sure is that it won’t be as much as 330 cubic meters.
So, it’s probably 11.2m x 9.6m x 3m = 325 cubic meters plus a buffer of 20 square meters, plus whatever extra volume results from the slope on your site. Then you also need to account for soil loosening, so multiply everything you calculate by 1.33. But it’s never possible to calculate this precisely. For example, at my neighbor’s site, they excavated an additional 70cm (28 inches) over 600 square meters without notice because the surveyor miscalculated to his disadvantage.
What I can tell you for sure is that it won’t be as much as 330 cubic meters.
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