How much public liability insurance does a carpenter need?

This question is entirely dependent on the circumstances of your business. You need to consider the potential extent a compensation claim might go to if there is an accident, as well as the monetary value of all your stock and what legal costs you might incur if you are taken to court. You also need to be realistic about the costs of any property damage you might accidentally cause. You understand the ins and out of your insurance best, so you need to make the decision about how much public liability insurance to take out.