Form
S + have/get + Object + Past Participle (V3).
I had my car repaired.
She is going to get her hair cut tomorrow.
Meanings
have/get something done
We use this structure when we arrange for someone (usually a professional) to do a service for us. The focus is on the result, not the person who does the action.
I had my watch fixed.
(Meaning: I didn’t fix the watch myself; I paid a watchmaker to do it.)
We are getting a new kitchen installed.
(Meaning: We are paying builders to install it.)
Get is slightly more informal than have.