Properly installed and maintained cedar siding lasts 20-40 years on Long Island, with some installations reaching 50-75 years when homeowners stay on top of maintenance. The lifespan depends heavily on the cedar grade, installation quality, and how well you maintain the finish over time.In West Islip’s climate, cedar’s natural oils provide excellent protection against moisture, rot, and insects—the main threats to siding longevity. However, you’ll need to plan for refinishing every 3-5 years to maintain optimal protection and appearance. This isn’t necessarily a negative: many homeowners enjoy the ability to change colors or refresh their home’s look periodically.The key to maximum lifespan is professional installation with proper moisture barriers, adequate ventilation, and marine-grade fasteners. DIY installations or work by inexperienced contractors often fail within 10-15 years due to moisture intrusion, improper fastening, or inadequate prep work. When done right by Suffolk County specialists who understand our specific climate challenges, cedar siding becomes a decades-long investment that actually improves your property value over time.