I am a General Contractor and we did a project for a customer. We collected payments as the project progressed. When it came to the final payment the customer is refusing to pay. I am in the process of filing a mechanics lien and the notice of intent will be sent in the next few days. If no payment, I will proceed with the lien but in Colorado the lien is only good for 6 months so you must proceed with a foreclosure process within that 6 month period. I don't know anything about the foreclosure process and what it entails.