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A roof reaches a point where patching individual problems costs more, over time, than starting again. Roof replacement is a full strip-and-replace: the old roofing comes off, the structure gets checked, and a new roof goes on in tile or metal, with new sarking, flashings and valleys.
Frequent leaks in different spots signal the roof as a whole is failing, not just one section. Roof age matters too — older roofs nearing or past their expected lifespan cost more to keep patching. Visible sagging points to structural or widespread material failure, and extensive cracking or rust spread across the roof, rather than isolated to a few tiles or sheets, is another clear sign replacement makes more sense than another repair.