Hello everyone,
After a long search, we have finally found a plot of land that we want (and can afford). Now the question is how to build.
To explain briefly, it is a slight slope parallel to the street. In front of the plot, there are two parking spaces, so the driveway can only be on the upper left side.
A soil report states that the soil is clayey. Building is allowed at 200 meters (656 feet) above sea level ± 0.50 meters (1.6 feet). The total height for shed roofs must not exceed 7.50 meters (25 feet). The shed roof must have a pitch between 10° and 15°, the orientation does not matter (preferably facing south due to a planned photovoltaic system). We would like to build two full stories.
The construction will be solid masonry, but we are still undecided between aerated concrete, clay blocks, or Neopor concrete.
Now the question is whether it makes sense to plan a basement, which would only be used as storage and for the building’s technical equipment. Possibly, depending on the size, also for a hobby room.
On the topic of basements, you find very different cost estimates ranging from €15,000 to €70,000. Since the basement will be finished by ourselves, I am mainly interested in the cost of the basement shell itself, not the complete finish.
Is a basement even possible with the maximum building height and two full stories?
What are the additional costs compared to building without a basement? Because of the slight slope, quite a bit of excavation would be required to create the foundation for the slab.
To give you a rough idea of our plans, I have attached two images.
The red numbers indicate the elevation in meters above sea level at the corners.
What do you think about the basement? We find it hard to design a floor plan where there is enough space on the ground floor for both the technical and storage rooms. But we also don’t want to “bury” unnecessary money.
PS: I’m happy to receive suggestions for the floor plan as well, but the main focus should be on the basement question.
After a long search, we have finally found a plot of land that we want (and can afford). Now the question is how to build.
To explain briefly, it is a slight slope parallel to the street. In front of the plot, there are two parking spaces, so the driveway can only be on the upper left side.
A soil report states that the soil is clayey. Building is allowed at 200 meters (656 feet) above sea level ± 0.50 meters (1.6 feet). The total height for shed roofs must not exceed 7.50 meters (25 feet). The shed roof must have a pitch between 10° and 15°, the orientation does not matter (preferably facing south due to a planned photovoltaic system). We would like to build two full stories.
The construction will be solid masonry, but we are still undecided between aerated concrete, clay blocks, or Neopor concrete.
Now the question is whether it makes sense to plan a basement, which would only be used as storage and for the building’s technical equipment. Possibly, depending on the size, also for a hobby room.
On the topic of basements, you find very different cost estimates ranging from €15,000 to €70,000. Since the basement will be finished by ourselves, I am mainly interested in the cost of the basement shell itself, not the complete finish.
Is a basement even possible with the maximum building height and two full stories?
What are the additional costs compared to building without a basement? Because of the slight slope, quite a bit of excavation would be required to create the foundation for the slab.
To give you a rough idea of our plans, I have attached two images.
The red numbers indicate the elevation in meters above sea level at the corners.
What do you think about the basement? We find it hard to design a floor plan where there is enough space on the ground floor for both the technical and storage rooms. But we also don’t want to “bury” unnecessary money.
PS: I’m happy to receive suggestions for the floor plan as well, but the main focus should be on the basement question.
First, have the site surveyed. Is there a soil report?
I would definitely base the decision on how steep the slope is within the building area and what kind of soil you have.
Are you planning to build turnkey through a general contractor? Is it a masonry build or using an architect with separate contracts?
I would suggest getting in touch now. Floor plans are created by the architect or planner. You don’t need a final floor plan at this stage; you attend a space planning session. How many rooms, approximate sizes, your no-go areas, your wishes. The whole process is a project that needs to develop over time.
I would definitely base the decision on how steep the slope is within the building area and what kind of soil you have.
Are you planning to build turnkey through a general contractor? Is it a masonry build or using an architect with separate contracts?
I would suggest getting in touch now. Floor plans are created by the architect or planner. You don’t need a final floor plan at this stage; you attend a space planning session. How many rooms, approximate sizes, your no-go areas, your wishes. The whole process is a project that needs to develop over time.
Nordlys schrieb:
Otherwise, 11ant is right, and I think your terrain is no longer a gentle slope but a steep slope. The conclusion "steep slope" is not mine, and I don’t see it there either: 1.80 m (5.9 ft) over 22 m (72 ft) results in just under 8% / 5° gradient. If it is reasonably linear, a height difference of more than one meter only occurs at a building depth of more than 12.20 m (40 ft). At 11 m (36 ft) building depth, 90 cm (35 inches), with 30 cm (12 inches) “embedded” on the uphill side, this results in 60 cm (24 inches) of foundation on the downhill side, which does not yet mean a raised foundation or basement.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
11ant schrieb:
I already wrote this: "with a height difference (measured across the depth of the house)".
If the height difference between the uphill side and the downhill side of the house equals "a basement," then you might as well build it completely—that is, use the raised downhill side as living space. Roughly speaking, for every 20 cm (8 inches) of "wall height" in the house’s lower structure, about 10% of the basement cost is added proportionally. Therefore, a common rule of thumb is to calculate 100% of the basement cost for a height difference of 2 meters (6 ft 7 in), and less proportionally below that.
Of course, more of a rough guideline than an exact calculation. OK, I must have missed that.
Hmm, since we want a narrow floor plan that should face north, the height difference will probably be relatively small.
It seems I really need to wait for the surveyor. Quotes are currently being obtained.
But thanks for the help.
[QUOTE="Nordlys, post: 254988, member: 32530"]How to build a basement should be specified in the soil report. In ours, finally – here it’s clay soil – the geologist advised against it. Not explicitly, but those who can read will understand. Otherwise, 11ant is right, and I think your site is no longer a gentle slope but a steep slope. Almost 2m (6.5 ft) over the short plot length of just over 20...[ /QUOTE]
Thank you, the soil report only covers the whole residential area, not the specific plot. I will take a look and read up on it.
Thank you, the soil report only covers the whole residential area, not the specific plot. I will take a look and read up on it.
11ant schrieb:
The term "steep slope" is not mine, and I don’t see that here either: 1.80 m (6 feet) over 22 m (72 feet) is just under 8% / 5° gradient. If it’s roughly linear, a height difference of more than one meter (3.3 feet) only occurs beyond a building depth of more than 12.20 m (40 feet). At 11 m (36 feet) building depth, it’s 90 cm (3 feet), with 30 cm (1 foot) “buried” on the uphill side, which means 60 cm (2 feet) of foundation on the downhill side—this does not come close to a “raised mound or basement.” The plot slopes quite evenly and used to be cultivated farmland until the city rezoned it for building.
I will update again when there is more information about the plot.
red-ed schrieb:
A soil survey is conducted for the entire residential area, not specifically for the individual plot. If the tested locations are spread out widely enough, the survey should still be useful. The soil composition hardly varies to the extent that a single plot would be an exception. Only nutrients might differ if different crops were grown on neighboring fields—but that no longer matters for building land.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Similar topics