Did a house today that had a cmu foundation which I very very very rarely see in my area. There were quite a few cracks which is really surprising to me. Our soil here is primarily rock covered with usually maybe 6in of dirt. At what point would you call out a large number of cracks a foundation issue. None were wide at all, primarily just tiny hairlines however some did stair step. Oh and the house is from 1968.
Observation: CMU, Concrete Masonry Unit block foundation walls.
Recommend: A licensed CMU, Concrete Masonry Unit block foundation wall installation and repair contractor:
1: Assess the foundations overall performance.
2: Repair or replaced damaged CMU blocks,and cracks in the mortar creating mortar bond loss which is an entry point for water infiltration.
3: Limitations: No or limited access to Area/s below steps, decks, patios. Exterior of Foundation below grade. Interior wall assemblies. Etc…
Hope that helps.
Settlement/movement cracks, from here it looks like the foundation is not going anywhere anytime soon. Just needs sealing.
No cracks above grade will ever allow water entry.
Likely post construction settlement, as Simon said.