Behind the scenes
Wand repair services are presumably limited to minor damage. The series firmly establishes that wands eventually reach a point where they are beyond repair. An example is Ron Weasley's first wand after it was damaged when Ron and Harry Potter crashed the Weasley family's Flying Ford Anglia into the Hogwarts Whomping Willow in 1992.
Broken wands generally cannot be repaired; the only known way is for the wand to be magically restored by the Elder Wand.
- Harry Potter and the Half-Blood Prince (film) (First mentioned) (Mentioned in The Quibbler)