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Relocating and adding to plumbing systems can be very expensive on a remodeling job. Since plumbing codes are stringent and complicated, it's always best to call in a professional plumber before giving a final estimate. Still, there are many red flags you can learn to recognize on an initial visit to a site. Sizing up the system can help you and your client plan well and avoid surprises. For any plumbing system you should ask four basic questions: • Has the existing plumbing caused hidden damage you will be responsible for once the job is started? • Will your plumber be able to work with the existing plumbing, or will it be impractical to connect the new to the old? •