When we (homeowners) built a shed in back, we had to fill out a form giving specifics on size, materials, etc, etc. I think my hubby actually had to do some sort of drawing, showing what we intened to build. Then, we had to get letters and signatures from our bordering neighbors saying that they were okay with it. Once it was approved through the HOA, we were given the go ahead. Once it was finished, we sent photos to them to make sure it was acceptable. Same thing when we put the pool in, drawing specs, neighbor approval, etc. etc.
I agree with everyone else, I bet the homeowner will need to be the middle man for ya. Good luck with your project!!

You could just bypass that like our neighbor did when he built a back porch. Oh wait, he couldn't contact HOA, because he doesn't pay his HOA dues!

At least the porch looks decent.