Remodeling of almost any kind requires a building permit in most areas. Any time a project expands the living area, extends the roofline, requires significant structural change, such as the demo of a load-bearing wall, or adds to the exterior of the existing structure (for instance, decks and fences), you will need a permit. A building permit will be needed when the project involves changing the sewer, plumbing, electrical installations, and fire protection.