HAVE/GET SOMETHING DONE

When another person does something for us, we use the Causative Have structure: 

If I say: 

"I am building my house", I mean that "I" am building it with my own hands.

If I use the Causative Structure: 

"I am having(HAVE) my house(SOMETHING) built(DONE), I mean that someone else is building it for me

We have to put Have in the correct form and tense, the thing that another person is doing for us and a past participle. If we say HAVE/GET+SOMETHING+DONE, it would be much easier to remember

I am having my hair cut (efllecturer.blogspot.com)

I am painting the ceiling / I am having the ceiling painted (https://4.bp.blogspot.com)