The steel is designed for 20-25 years of active ocean service. Salt water, heavy loads, stacked 9 high. As a house on a foundation it lasts much longer. I have seen 40 year old containers still structurally sound after paint and seal replacement. What determines lifespan: your climate. Dry climates like Arizona or Nevada: 50 plus years with minimal maintenance. Humid coastal areas: annual paint and seal inspection required. Cold climates: foundation matters more than the container. What wears out first not the steel. Sealants around windows and doors. Paint coating. Insulation if moisture gets in. Interior finishes. All replaceable. The steel shell is the most durable part. Estimate: 25 years no maintenance. 40 plus with basic annual care. 50 plus in dry climates. Email info@atvworldwide.com.