Hello dear forum,
After much consideration, we have finally decided on a house.
It will be 175 sqm (1,884 sq ft) for a family of five.
We are still debating: basement or slab-on-grade?
We have a slightly sloped plot and are weighing which option would be the best in the end. The basement would be a utility basement, incorporating a double garage, a workshop, and a storage room.
The alternative would be to build on a slab-on-grade with a double garage plus storage/shed space.
Since we are building on a slight slope, we are thinking about what costs to expect for each option. Of course, excavation costs are hard to predict, but maybe someone can estimate. Two excavation contractors have already examined the site and said that both basement and slab-on-grade are possible without problems. However, no one wants to give us a rough cost estimate, which complicates things.
Our idea was that with the basement including two garages, we might save some costs for slope retaining. Building on a slab, plus a double garage, plus higher costs for slope retaining might end up in a similar price range. We wouldn’t have much storage space inside the house.
The quotes we have are as follows:
Slab-on-grade 17,000 + 25,000 for double garage including foundation + total X for excavation work.
Basement 45,000 + 20,000 for finishing + total X for excavation work.
Could anyone give an assessment of which option seems more sensible?
After much consideration, we have finally decided on a house.
It will be 175 sqm (1,884 sq ft) for a family of five.
We are still debating: basement or slab-on-grade?
We have a slightly sloped plot and are weighing which option would be the best in the end. The basement would be a utility basement, incorporating a double garage, a workshop, and a storage room.
The alternative would be to build on a slab-on-grade with a double garage plus storage/shed space.
Since we are building on a slight slope, we are thinking about what costs to expect for each option. Of course, excavation costs are hard to predict, but maybe someone can estimate. Two excavation contractors have already examined the site and said that both basement and slab-on-grade are possible without problems. However, no one wants to give us a rough cost estimate, which complicates things.
Our idea was that with the basement including two garages, we might save some costs for slope retaining. Building on a slab, plus a double garage, plus higher costs for slope retaining might end up in a similar price range. We wouldn’t have much storage space inside the house.
The quotes we have are as follows:
Slab-on-grade 17,000 + 25,000 for double garage including foundation + total X for excavation work.
Basement 45,000 + 20,000 for finishing + total X for excavation work.
Could anyone give an assessment of which option seems more sensible?
No, I don’t see just a slight slope here. I actually see closer to two meters rather than one and a half meters within the building area, and according to my basement rule, definitely a basement — but not one with an integrated double garage. Looking at the driveway situation, it seems quite clear to me, and as the Chancellor would say, "without alternative," that two single garages are the way to go, namely on the building edges on the right side of the plan (northwest?) and the top of the plan (southwest?), both at driveway level (so probably a bit above the basement floor).
Is that measured on the uphill side, downhill side, or from a fixed reference height?
The quality of my advice tends to decrease exponentially with the "size" of the development plan excerpts.
I would be doing you a disservice if I suspected any relation to the other newbie with the "expertise," wouldn’t I?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Thirteen schrieb:
The development plan specifies a maximum ridge height of 11m (36 feet).
Is that measured on the uphill side, downhill side, or from a fixed reference height?
The quality of my advice tends to decrease exponentially with the "size" of the development plan excerpts.
BackOnTrack schrieb:
I would go for a slab-on-grade. But a basement is not bad either.
I would be doing you a disservice if I suspected any relation to the other newbie with the "expertise," wouldn’t I?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Am I correct in assuming that we are still talking about the same plot of land as in https://www.hausbau-forum.de/threads/ideenfindung-untergeschoss.35429/ and https://www.hausbau-forum.de/threads/ein-grosses-raumkonzept-sucht-ideen.35707/?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
11ant schrieb:
No, I don’t see even a slight slope there. I actually see more like two meters rather than one and a half meters within the building zone, and according to my basement rule, definitely a basement—but not with an integrated double garage. Looking at the driveway situation, it seems pretty clear to me, and as the Chancellor would say, "no alternative," that two single garages should be placed on the building lines: to the right on the plan (northwest?) and at the top of the plan (southwest?), both at driveway level (so probably a bit above the basement floor).
Uphill side, downhill side, or from a fixed reference height?
The quality of my advice regularly decreases exponentially with the "size" of the zoning plan sections.
If I were doing you a disservice, should I suspect a relation to the other newbie with the "expertise"? Sorry, I forgot to mention: downhill side 11m (36 feet).
I’ve actually already had the "concern" that the basement will quickly cost us more than the offer we received.
So I’d almost say it’s out of the planning now.
We’d rather go with a single garage or a carport with an adjacent storage room. That’s all we need.
We are currently estimating the earthworks costs (excavation, disposal, possibly backfilling) at around 35-40t (35,000-40,000). Is that realistic?
PS. Yes, same plot.
Thirteen schrieb:
From that perspective, I would almost say the project is off the table.My basement rule sees it differently; it basically states (in simplified terms) that "with a two-meter (6.6 feet) height difference within the building envelope, an unbuilt basement costs almost the same as a built one and simply does not provide any return for that cost."https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Sorry, but the rule is strict—and I’m just stating it; reality set it in place. Like all general rules, it’s not entirely precise, but essentially it holds true—assuming regular conditions, which I do not exclude here. You can forget about using a slab foundation here: to level out a two-meter (6 ft 7 in) height difference, you would still need to fill one meter (3 ft 3 in) on the street side and excavate one meter (3 ft 3 in) on the garden side—something hardly desirable, and even that amount of earthwork already incurs costs (including materials, since you can’t just reuse your excavation material as is). Besides, you do not have the space to slope even that one meter (3 ft 3 in) between the property line and the building envelope (and to provide drainage). Forget the hope of having a choice here; your lot has essentially chosen the basement for you.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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