Plumbing diagram examples are widely available on construction and plumbing websites. Books that explain basic and complicated plumbing projects, such as "Practical Plumbers' Work" by Paul N. Hasluck, are available at local and online bookstores.
When changing existing plumbing, copies of the original sewer and drain layouts are needed. These records can be obtained through local government offices. One must consider several important factors when embarking on a do-it-yourself plumbing project. First, county or city codes may prohibit anyone but professional plumbers from doing any sort of plumbing construction. In locations where it is permissible to do plumbing work, projects must be approved by a plumbing inspector before the required building permits are issued.