The answer to 'shingle replacement warranty' is that most asphalt shingle roofs come with a manufacturer's warranty that covers defects in the shingles for a certain period of time, typically 20-30 years. The warranty covers the cost of replacement shingles, but does not cover the labor costs to remove and install the new shingles. Proper installation by a licensed and experienced roofer is also required to maintain the warranty.
Shingle warranties can vary by manufacturer and product line, so it's important to review the specific warranty details when having a new roof installed. Factors like climate, roof ventilation, and proper maintenance can also impact the lifespan of the shingles and the warranty coverage.