Revisions log for question
What to expect by building an underground garage on a slope?

Our lot has a driveway that is 5 m wide, but it goes straight down a slope that is about 2 m high.

The entrance to the garage must be at ground level, so the garage (to the right of the cellar) will be in the ground on both sides (back and right) all the way to the top of the garage. What costs should I expect when building such a garage?

It should be airtight because of moisture in the ground and structurally more stable than a detached garage. The necessary excavation for the garage will be made along with the basement excavation. Also, if we want to put our motorhome in the garage (saving extra parking space/building a garage next to the house),

How much would it cost to have a 12m long and 2.7m high (entry height) garage? The 2 sides should also be protected from moisture and ground pressure. Or is this "idea" completely unrealistic?

• garage