I am a carpentry contractor and I subcontract from various companies to build decks, porches additions etc. I've done many jobs for Magic Home Services for which they pay me piece rates per square foot of deck or roof, per linear foot of hand rail, per footing etc. I have been paid $2,500 on a job that I thought paid $7,000. When we wrote the notice of intent to lien it was for the difference, $4,500. Now upon writing an invoice I see that the total is actually $8,807, leaving a balance of $5,807. Now I'm ready to file the Mechanics Lien. Can I increase the amount owed?