Im an engineer in south flroida. I did heat load calcs and mechanical plans for an owner. cost was $2800. I dont have a written contract but we sent the bill for 2800 and he responded he would pay after we made one change to the plan. We made the changes now he says he wont pay.
The answer to your question is in the details of the job, including the signed contract if there is one. If you want to send me the information, I will be happy to look at it and let you know if your lien rights still exist. Please send me your contact information. I look forward to hearing from you. Thank you.