Steven Smalley, owner of Exterior Home Improvement, in Indianapolis, notes the telltale signs: waving, bubbling, studs uneven. And the first paragraph in his contract states that that siding will be completely removed.

When Jason Kersch, of Major Homes, in Queens, N.Y., explains to homeowners why he’s removing all of the existing siding before installing the replacement product, he invokes the roofing analogy — homeowners better understand the concept of starting over. “No one wakes up one day and says they want a different color roof,” he notes. “They buy a new roof because they need a new roof. They replace siding because they want a new look.”