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Question DetailsAsked on 4/17/2018

Cost to dig out and construct a 1200 soft basement under a existing home on a crawl space in San anselmo, Ca 94960

The crawl space is not about 1 1.5 meters maybe. We would need another 2 meters at least in height. How much would it cost in the location above? Thanks.

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2 Answers


Hello Sibert,

Thank you for reaching out. We are happy to help! If you have not done so already, please go to to set up a membership. Once completed you will have access to highly rated service providers in your area. By searching the “Foundation Repair” category, you will find top rated providers that can fit your needs.


Iann M

Answered 2 years ago by Member Services


Digging a basement under an existing home with a crawl space is a job that varies wildly in complexity depending on the existing construction, site topography, and access. This is never a trival task. Remember that your existing foundation probably does not go deep enough for a full basement, so the project may involve replacing the entire foundation all around your home. Engineering drawings and building permits will need to be complated and approved before any work can start. I cannot imagine any reputable contractor giving you a cost estimate without a detailed site visit.

Best of luck, and try to get two or three bids.

Answered 2 years ago by beentheredonethat

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