Have Something Done
Subject + (have/has/had) + object + past participle
To have something done is used when a person does not himself execute an activity, yet its (activity's) result is closely related to that person. To have something done is also called "causative have".
- I had my car mended. (a mechanic did it for me)
- He had his room painted. (my father painted it)
- Patrick has his hair cut every 2 weeks. (a barber does it for him)
It is possible to use get instead of have:
- I am going to get my hair cut.