Knowing if an estimate from your PM is reasonable

[Mikhail L.]

Howdy, I'm new to having my property managed by a Property Manager, and there's quite a bit that I still didn't learn before hiring a PM.
My PM will come to me with estimates for repairs and work that seem awfully high for the relative amount of work needed. How do you check/verify if what your PM is bringing to you is reasonable?

An example is this quote for repairing a relatively small amount of damage after my property was broken into. Thoughts?