Having any bad payers I view as a management failure. I don't give credit to anyone. I have enough work coming in to be selective in what I take on.
Exactly what I do with a decking quote. The deposit is 50%, payment of the balance on completion of the job to the customers satisfaction (hence no retention).
Why not? I don't run monthly acounts with my suppliers, so I would have to fund the materials for anything up to a fortnight for a decking job. That involve a high risk for me and a financial cost.
Can you imagine if I went into Jewsons & asked to open a credit acount with a £22K limit if they had never done business with me, didn't know me & I couldn't supply trade & bank references?
Entertainment agents ask for a deposit up front - around 20% (their fee) and full payment before the event. You also sign an Equity contract with a cancellation clause agreeing to payment in full if the booking is cancelled with less than 3 months notice.