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How are you getting the dirt out? How are you getting gravel and concrete in? How deep are the water, sewer, and gas lines - are they going to be hanging in the middle of your basement?
Permits required? Are there companies that do this work in your area?
I am thinking about using some kind of conveyor system to get the dirt out through the crawl space. I hadn’t thought about how to get the gravel and concrete in. All the Gas/Water/Sewer Pipes are right underneath the floor joists.
I am sure I'll be needing a permit or two; I live in the Seattle area so I know there are some companies that can do this kind of work.
I was talking to a guy at work that said they would probably have to jack the house off its foundation, is that normal?
Another way is to make sure the house is supported, then dig it out as you planned. Once its dug out, you may or may not need a new foundation inside the existing foundation.