Public liability insurance protects you and your business against the financial risk of being found liable for negligence. This may be for property damage or personal injury to a third party. However if that loss is the result of faulty workmanship it may result in your claim being declined.
One insurers wording excludes claims “for the cost of performing, completing, correcting or improving any work undertaken by You.”
Some insurers do offer Faulty Workmanship Insurance, and others also will allow you to add as an extra to your business insurance or public liability policy.
Still unsure, speak to a specialist, get them to review your potential risks and possible mitigation.