The answer to 'how often to replace shingles' is that most asphalt shingle roofs need to be replaced every 15-30 years, depending on factors like climate, roof slope, and quality of installation. Properly maintained shingles can last up to 30 years, but harsh weather, sun exposure, and normal wear and tear will cause them to deteriorate over time.
Signs it's time to replace your shingles include curling, cracking, missing granules, or leaks in your roof. Regular inspections by a professional roofer can help identify when your shingles are nearing the end of their lifespan. Replacing your roof before major leaks or damage occurs can prevent further home damage and costly repairs.