Contractors

We hired a contractor to do work for our business. We secured an SBA loan and received a quote from him as required by the bank. We had known him previously, and no contract was signed. We have paid him 50% more than his original quote and the project has taken four months longer than promised. His last bill we refused to pay as we did not see that he had done any work justifying the amount and was 25% of the original cost for the project. As I said we had already paid 50% above the original quote. He then went on vacation and we had to meet with the various inspectors to get passed as he was not around. He has not contacted us since he left for vacation which was 4 weeks ago. I now need an unconditional waiver signed for the property company and can not get a response from him. Can he put a lien against us? We have overpaid on his original quote and he has doubled the original end time that was promised on the job so I would hope not. What are my options? I don't want to sue him, I just want this waiver signed so I can move on with my business.

If a general contractor files bankrupty, can a material house or subcontractor still file a lien on the project the general contractor did not pay them for their services? This is in the state of Hawaii.

What documents are correct for a public job in Indiana, ie.: Public School job? We are a supplier and have been paid for a portion of the balance. We need to supply a waiver for the payment on this school project.

My plumber filed a mechanics lien on my single family home almost 90 days after the last labor was performed or materials were used. How do i challenge the validity of the lien? No contract was ever signed for the work and no change orders were ever presented/signed. The legal question is regarding a house in Wilmington, Ohio, Clinton County.

Can an architect file a mechanics lien in Pennsylvania for unpaid fees and if possible, what would be the pertinent timeline for such action?