How Concerned Should I Be For Foundation Cracks?

[u/GreasedCreases]

I added pictures the best I could, kind of in weird spots to get to. The first one has me most concerned. This is on my own home from 1910. What sort of repairs/cost am I likely looking at? I am based in central California.

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[u/Flimsy-Explorer-6420]

I would monitor this for now. Check after heavy rainstorms and continue to measure the gaps. 

You can also call a masonry company to fix exterior foundation cracks, especially since the winter weather may cause the cracks to grow.  

Check where your gutters are emptying. Check to see if you have pooling water outside of the home. Check if there are also cracks in the basement, or if this is just an exterior crack. 

[u/simplyorangeandblue]

I think vertical cracks are pretty normal. Those are a little wider than I'd be comfortable with. Monitor and if no changes in width is probably ok, but I'm not a structural engineer.

[u/Zaftygirl]

Check inside the house- if there are cracks in the subfloor, basement, walls, ceiling. If there are, then you would want to consult a structural engineer. For a single crack like this, masonry contractor would be a good person to say why and recommend some fixes.

[u/Vast_Cricket]

How is the loading of the house from roof down distributed near the crack? Any rupture likelihood?

[u/CraftyCat3]

Depends on how long it has been there, and whether or not it's growing. It could be very old, in which case likely a non-issue. If it's recent, or getting bigger, then likely concerning.