The other guy's quote for $10k is insane. There was already a gap in the foundation for access to the crawlspace, a bit of damage on either side of it will not cost that much to repair and is not an urgent structural issue.
Have a plumber fix those pipes then get under there, support the joist with a jack, cut out the damaged pieces, reinforce and build a form, pour, let set, remove jack. Maybe $5k total if you have all the work done professionally. Plumber would probably charge you more than the concrete guy.
Even just stacking concrete blocks is fine. A foundation repair specialist might build an under framing with girders and 4 to 6 concrete block piers. No one should really need to tear anything out though. They might pour some new footers depending on the load specifications but most likely they just use cap block or precast composite footers.
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u/TertiaryOrbit 5d ago
Roughly, how much would it cost to fix something like this?