Your duty as a professional plumber is to notify the homeowner of non-compliance. It is the responsibility of the homeowner to rectify the non-compliance. If the homeowner wishes for you to quote on the rectifying of the non-compliance and make use of your services, you are free to do so. You are not precluded from doing this in any way. We do however caution you that the notification and quoting should be done before any work been undertaken as this will most likely lead to a dispute if done after.