The answer to 'how often to retaining wall' is that retaining walls typically need to be inspected and maintained every 1-2 years. Proper maintenance helps ensure the wall continues to function safely and effectively over time. This includes checking for cracks, loose or missing blocks, erosion, and other signs of wear or damage.
Depending on the materials used, climate, and other factors, a well-constructed retaining wall can last 20-50 years or more with regular upkeep. However, walls made of wood or other less durable materials may only last 10-15 years before needing replacement. It's best to have a professional landscaper or engineer inspect your retaining wall on a regular basis to catch any issues early.