subcontrator for window and doors , project is form different home builders. sometimes i missed to file within 20 days of first delivery date of every phase , i need to save time if i can just file the full amount of the contract if available. often not avalilable until i received PO for another phase of the project.
You only need to send preliminary notice once per contract. The preliminary notice should state your good faith estimate of the total amount to be incurred under that contract. But if that amount changes, your preliminary notice is still good for the duration of the contract provided that your original estimate was stated in good faith. If you do not have an overarching contract and are only relying on purchase orders there is an argument that each purchase order is a seperate contract requiring seperate preliminary notice. You can avoid this argument and ensure you are protected by the initial preliminary notice by having an overarching contract for the project.