When you start to see U pitting, scaling and stone exposed, that means you could be in the market for resurfacing rathr than just replacing your concrete entirely.

Any cracking , chipping, and discoloration can be an indication of failing stucco and may require some investigation just to see how bad of shape it really is in.

Cracks, holes, staining and moss growing on brick could mean it's time for some tuckpointing and/or brick or stone replacement.