Whether you have to pay your conveyancer if the sale falls through can depend on the terms of your agreement with them. Some conveyancers offer a 'no sale, no fee' policy, which means you may not have to pay their full fee if the transaction does not complete, although you might still be responsible for any out-of-pocket expenses such as search fees. However, if this policy is not in place, you may still be liable for the fees as per your contractual agreement. It's important to understand the terms of service before hiring a conveyancer.