I'm working on a site which could benefit from having an enclosed residential garage over a living space within the same concrete house...

The site slopes steeply (1:3) down from the road and in order to reduce mass held by the retaining wall I'd like to incorporate part of the house within the retaining wall – which would mean part of the living space would lie beneath the parked cars.

Does anyone know of examples where this has been done?

Are there any unusual precautions to take, for safety, structure, carbon monoxide, live loads, etc...?

Any help would be appreciated, thanks!

I guess it would also depend heavily on were you live if it would be allowed by local building codes. If it is anywhere near a place were earthquakes are frequent my guess is building codes would prevent it. I would look for a Seattle contractors that has past experience with a project like this.

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