We would like to expand our lower level by digging out under than deck
+3
It would involve tearing our the concrete wall that is part of the foundation on that side of the house. It is built into a hillside.
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You are going to need an engineer to help you find a way to hold up the house, probably a steel beam and maybe concrete piers.... the foundation is what holds up the house and supports all the weight, especially on a hill. this is not a DIY project without plans from an engineer.
Before you start doing demolition - especially some of which is part of the foundation of the house, consult a structural engineer. You can't willy nilly start yanking out bits you do not want without making sure the structure is secure. The structure will be compromised or even collapse. Permits will be required so be sure to hire licensed contractors. Provided your budget is big enough, you can accomplish your goals!
Definitely get a structural engineer to advise you and size what kind of support you would need to replace the wall. This is not A DIY project.
You're going to need a permit from the city to do this job.
Here's a video that might help...
Yup - get a structural engineer. This is the foundation to your house which is holding it up - just like a load bearing wall inside the house.
Thank you all for your input. ! We'll be consulting a Structural engineer