Do I put a lien on the homeowner's property or the contractor who is not paying us?

I am a siding and roofing subcontractor in Pittsburgh, Pennsylvania. The builder-contractor is not paying me for work that we completed. We finished the work at the end of May, 2021. The homeowner says that they have paid the builder but the builder will not pay us. I need to file a lien. Do I file the lien on the homeowner's house/property or do I file the lien on the contractor's property? Also, the homeowner tells us that the builder signed a lien waiver.