In 14 years ,not dime, just a signature on the estimate sheet ,it's not the go ahead thats the problem it's collecting the money after thats the problem.
never lost a job, no thats not true lost 2 jobs this summer but no bigeee , just say 2 weeks we will be there, usually it's 3 but , it just seems when you say 2 weeks they say go ahead say 3 or 4 and they say we will considerate it.
Procedure I think will depend what is done in your neck of the woods.
lawrmart
play safe