ᐅ Double garage with a full basement / cellar

Hello everyone,

Does anyone have experience with basemented double garages?

Our double garage will be 7m by 9m (23 ft by 30 ft), and after a suggestion from an acquaintance today, I wanted to do some research and hear your opinions on this.

Background info:
House 11m by 9m (36 ft by 30 ft)
Garage 7m by 9m (23 ft by 30 ft)
No hillside location!

So far, we have always planned for a (usable) basement, but the costs for this are around 50,000 to 60,000 (currency). Now we have been advised to omit the basement (instead use a standard slab foundation) and instead build the basement under the garage, using that space as storage or additional area. The reasoning is that it’s much cheaper to build a basement under the garage because it doesn’t really need insulation, and so on.

Has anyone had experience with a project like this?

And is it really possible to save money with this approach?

Thanks!

And how do you get from the house to the basement? Through the garage? We have both because of the slope of the land. For example, you can also use a prefabricated garage as a basement, which is quite cost-effective. Ott prefabricated garages and Kemmler both offer this. But in that case, I would put a basement under the house.

One could consider installing a spiral staircase in the garage or an outdoor staircase in the garden, although in my opinion, garden staircases are no longer modern.

By the way, the garage is directly attached to the house, and there will also be a door from the garage to the pantry.

Cheers!

The insulation of the basement is one of the least costly factors. The basement under the garage might be a bit smaller, but overall it is not much cheaper.

However, the main reason I would advise against it is this: the excavation pit for your garage basement extends beneath the house, meaning that if you want to avoid future settling, the foundation for the house will become more expensive.

Boergi schrieb:

However, the main reason I would advise against this is that the excavation for your garage basement extends under the house. This means that if you want to avoid future settlement, the foundation for the house will become more expensive.

The house isn't built yet – so shoring during the construction phase, first for the basement then for the house slab, shouldn't be an issue.
If you don’t insulate the basement and just use it as storage space, moisture problems could occur.
What is your groundwater level? Can you simply build masonry walls in the basement area? I think having a basement under the garage might actually make the structural aspect somewhat easier.

Yes, but this means that his foundation slab no longer rests entirely on natural ground (at least a small part).