Have something done
We use it to express that we don’t do an activity ourselves but another person usually a professional does something for us.
We form it using HAVE (in any tense) + the thing + past participle
I have had my computer repaired = another person has done it for me
I have repaired my computer = I have done it myself
Common examples include: a mechanic, a hairdresser, a painter, an IT specialist, etc.
I had my car serviced. (I didn’t do it myself, a mechanic did it for me)
I am having my house painted. (I am not painting my house myself, a painter is doing it)
I need to have my hair cut. (I am not going to cut it myself, a hairdresser is)
I have had my computer repaired. (I haven’t repaired it myself, an IT guy has)
HAVE changes according to the tense that we want to express.
Past simple = I had…
Present continuous = I am having…
After a modal verb = I need to have…
Present perfect = I have had…
GET can substitute HAVE.
I had my hair cut = I got my hair cut.
I am having my house painted. = I am getting my house painted.