Hello,
I would like to try to get an overview of the costs involved with and without a basement for our planned semi-detached house.
My current findings (+ = additional costs, – = cost savings):
Basement (concrete):
+ more excavation, area roughly the same as the slab foundation
– soil can be used to fill the garden
– slab foundation is cheaper
+ basement walls, basement ceiling, insulation, drainage(?) (approx. 30,000 EUR)
+ finishing: heating, screed, possibly windows, floor coverings, partition walls, painting, ventilation concept
+ possibly underpinning the barn (approx. 1,500 EUR)
– more living space in the basement (priceless)
+ less living space on the upper floors due to lower knee wall if basement windows are required
+ carport addition for tires, roof box, etc. (would otherwise go in the garage)
– fewer rooms on the ground floor
– resale value
+ interest on all additional costs
Slab foundation:
+ fill material for the embankment, compaction for slab foundation (7x11.5)
+ load-bearing slab foundation (approx. 15,000 EUR)
+ utility room on the ground floor = more enclosed space because house is 1.5m (5 feet) longer
+ finishing upper floors and attic
+ larger roof
+ more (inefficient) hallway space inside the house due to utility room
+ garage as basement substitute
Did I forget anything? Does anyone have experience with the cost estimates for the points mentioned?
Maybe this helps other home builders to weigh the costs a basement incurs.
I would like to try to get an overview of the costs involved with and without a basement for our planned semi-detached house.
- The plot (about 10.5m (35 feet) wide) is already about 1m (3 feet) below the street level.
- After about 14m (46 feet) on the left side, there is an adjacent barn built on the boundary (foundation about 80cm (31 inches) deep).
- The semi-detached house must be built on the left boundary. On the right side, there is already a retaining wall about 80cm (31 inches) high.
- The entire plot (368m² (3960 square feet)) therefore needs to be "filled" by about 1m (3 feet).
- About 50-80cm (20-31 inches) of topsoil must be removed, then load-bearing sand follows.
- According to the development plan, a 4m (13 feet) setback from the street must be maintained.
- With a basement, we would need about 7.5m (25 feet) by 10m (33 feet) for the semi-detached house.
- Without a basement, we need a utility room for the technical equipment (buffer tank for air heat pump, electrical connection box, washing machine, ventilation unit, etc.) and a garage to replace the basement. I would estimate about 7.5m (25 feet) by 11.5m (38 feet), i.e., 11.25m² (121 square feet) more area.
- The house will face the street with the gable side.
- Water supply for the basement is not an issue on this plot.
My current findings (+ = additional costs, – = cost savings):
Basement (concrete):
+ more excavation, area roughly the same as the slab foundation
– soil can be used to fill the garden
– slab foundation is cheaper
+ basement walls, basement ceiling, insulation, drainage(?) (approx. 30,000 EUR)
+ finishing: heating, screed, possibly windows, floor coverings, partition walls, painting, ventilation concept
+ possibly underpinning the barn (approx. 1,500 EUR)
– more living space in the basement (priceless)
+ less living space on the upper floors due to lower knee wall if basement windows are required
+ carport addition for tires, roof box, etc. (would otherwise go in the garage)
– fewer rooms on the ground floor
– resale value
+ interest on all additional costs
Slab foundation:
+ fill material for the embankment, compaction for slab foundation (7x11.5)
+ load-bearing slab foundation (approx. 15,000 EUR)
+ utility room on the ground floor = more enclosed space because house is 1.5m (5 feet) longer
+ finishing upper floors and attic
+ larger roof
+ more (inefficient) hallway space inside the house due to utility room
+ garage as basement substitute
Did I forget anything? Does anyone have experience with the cost estimates for the points mentioned?
Maybe this helps other home builders to weigh the costs a basement incurs.
B
Bauexperte22 Dec 2014 11:54Hello,
Regards, Bauexperte
Tichu78 schrieb:How is the second semi-detached house partner building? On a slab foundation or with a basement?
Did I forget anything?
Regards, Bauexperte
So far, no one. I assume that a terraced house with a basement will be built there, as the plot is only 5.50 m (18 feet) wide. However, it is also possible that the adjacent plot will be purchased at some point and a semi-detached house will be built instead, probably with a basement as well. This means I would need to consider this during construction to avoid any issues regarding the underpinning costs for our house. Or would that not be our responsibility?
B
Bauexperte22 Dec 2014 12:03Hello,
Usually, the whole semi-detached house is kept under one ownership or at least built at the same time. So if your half of the semi-detached house is started before the other party is involved, it’s not your concern whether they decide to build with or without a basement later. If they build with a basement, they must ensure that your side of the semi-detached house does not settle; they need to underpin your part accordingly.
Regards, Bauexperte
Tichu78 schrieb:
So far, no one. I assume a terraced house with a basement will be built here, as the plot is only 5.50 m (18 feet) wide. But it could also be that the neighboring plot is bought later and a semi-detached house is built instead. Probably with a basement as well. This means I would have to consider this during construction to avoid issues with underpinning costs for our house. Or is that not our problem?
Usually, the whole semi-detached house is kept under one ownership or at least built at the same time. So if your half of the semi-detached house is started before the other party is involved, it’s not your concern whether they decide to build with or without a basement later. If they build with a basement, they must ensure that your side of the semi-detached house does not settle; they need to underpin your part accordingly.
Regards, Bauexperte
B
Bauexperte22 Dec 2014 12:13Hello,
Your side will—reasonably—have to be narrower so that the party wall can be properly constructed; you can hardly build over it. Essentially, it will have to be a true exterior wall if it’s uncertain when or whether an extension will ever be added.
Regards, Bauexperte
Tichu78 schrieb:
I would also prefer if the other semi-detached house were built at the same time. But the landowner simply doesn’t want to sell.
I’m curious how the open side will need to be insulated. Future soundproofing is also an issue.
Your side will—reasonably—have to be narrower so that the party wall can be properly constructed; you can hardly build over it. Essentially, it will have to be a true exterior wall if it’s uncertain when or whether an extension will ever be added.
Regards, Bauexperte
What are the advantages and disadvantages of a basement without windows?
Advantages: more living space on the upper floors, cost savings on windows, better water tightness
Disadvantages: no natural daylight, more excavation
The living areas upstairs become smaller if you keep the 4m (13 feet) eave height and maintain the floor plan.
I read somewhere that the basement should protrude about 80cm (31 inches) above ground level.
Does anyone know if it is possible to build so close to a neighboring semi-detached house on a boundary line that the corners just touch? Or do the buildings have to overlap in a certain area if they are within a certain distance?
Advantages: more living space on the upper floors, cost savings on windows, better water tightness
Disadvantages: no natural daylight, more excavation
The living areas upstairs become smaller if you keep the 4m (13 feet) eave height and maintain the floor plan.
I read somewhere that the basement should protrude about 80cm (31 inches) above ground level.
Does anyone know if it is possible to build so close to a neighboring semi-detached house on a boundary line that the corners just touch? Or do the buildings have to overlap in a certain area if they are within a certain distance?
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