We are a General Contractor working on commercial tenant spaces. We contract directly with subcontractors. Our subcontractors purchase materials from material vendors as part of our contracts with them. e.g. electricians purchase the lighting packages and glazing vendors purchase glass and door kits for installation. My question is if our subcontractors don't pay the material suppliers (or went bankrupt) can the materials suppliers place liens on our client's buildings? Also, do they have to submit a right to lien to the building owner?