I did work for a homeowner and still have a balance due seeing what i can add to my lien for the extra work required for payment?
If your contract does not specify interest, you can add the statutory default rate of 12 percent per annum.
Hire a construction attorney to include default terms like collection costs, higher interest, attorney fees, and on and on. The cost of an attorney to draft the contract is a fraction of what you will make and save long term.