It is generally a good idea to pay a contractor after the job is completed, and only after you have inspected and accepted the work. This way, you can be sure that the job has been completed to your satisfaction before you make the payment.

However, it is also common for contractors to require a deposit before they begin work. This is often done to cover the cost of materials or other expenses that the contractor will incur while completing the job. In this case, it is important to agree on the terms of the deposit and the payment schedule before the work begins. Make sure to get everything in writing, including any warranties or guarantees that the contractor may offer.

It is always a good idea to communicate openly and honestly with your contractor and to ask for a detailed written estimate or contract before work begins. This will help to ensure that both you and the contractor have a clear understanding of the scope of the work, the timeline, and the payment schedule.