Interview the Dublin Plumbing Contractors you're considering. Here are some questions to ask:

• How long have you been in business? Look for a well-established company and check it out with consumer protection officials. They can tell you if there are unresolved consumer complaints on file. One caveat: No record of complaints against a particular Plumbing Contractor doesn't necessarily mean no previous consumer problems. It may be that problems exist, but have not yet been reported, or that the Plumbing Contractor is doing business under several different names.
• How many projects like mine have you completed in the last year? Ask for a list. This will help you determine how familiar the Plumbing Contractor is with your type of project.
• Will my project require a permit? Most states and localities require permits for building projects, even for simple jobs like decks. A competent Plumbing Contractor will get all the necessary permits before starting work on your project. Be suspicious if the Plumbing Contractor asks you to get the permit(s). It could mean that the Plumbing Contractor is not licensed or registered, as required by your state or locality.
• May I have a list of references? The Plumbing Contractor should be able to give you the names, addresses, and phone numbers of at least three clients who have projects similar to yours. Ask each how long ago the project was completed and if you can see it. Also, tell the Plumbing Contractor that you'd like to visit jobs in progress.
• Will you be using subPlumbing Contractors on this project? If yes, ask to meet them, and make sure they have current insurance coverage and licenses, if required. Also ask them if they were paid on time by this Plumbing Contractor. A "mechanic's lien" could be placed on your home if your Plumbing Contractor fails to pay the subPlumbing Contractors and suppliers on your project. That means the subPlumbing Contractors and suppliers could go to court to force you to sell your home to satisfy their unpaid bills from your project. Protect yourself by asking the Plumbing Contractor, and every subPlumbing Contractor and supplier, for a lien release or lien waiver.
• What types of insurance do you carry? Plumbing Contractors should have personal liability, worker's compensation, and property damage coverage. Ask for copies of insurance certificates, and make sure they're current. Avoid doing business with Plumbing Contractors who don't carry the appropriate insurance. Otherwise, you'll be held liable for any injuries and damages that occur during the project.