Good evening. As long as you have constructed this porch as promised, you are on solid footing. The first thing you can do is to put a mechanic's lien on the property to secure any amount not paid you. Then, if you and the customer cannot settle this between the two of you, you will need to file a claim against them...at your hearing, fortunately for you, you will get a fair and impartial consideration of your case by a judge or a jury versus the unilateral biased opinion of the customer. Given that, you should do fine.
I hope this has given you the guidance you were seeking. I wish you the best of luck!
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The information given here is not legal advice. As all states have different intricacies in their laws, the information given is general only. This communication does not establish an attorney-client relationship with you. I hope this answer has been helpful to you.