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This depends mainly on how well the posts were installed and what type of wood was used to build the gate in the first place. Softwoods have a life expectancy of up to 15 years but can last slightly longer with regular maintenance and waterproofing treatments. By contrast, hardwoods can last up to 30 years with little care, so you may avoid costly replacements by spending a little more upfront.

Your wooden gate post hole should be a third to a half of the height of the post. Also, note that the diameter of the post hole should be three times the diameter of the post. You should set the post in concrete to ensure a long-lasting and durable post that will withstand the test of time.

On most untreated wood fences, there is no need to sand before treating. You typically only need to sand if there’s an old coat of paint or stain on your fence. If you do need to sand off a previous paint or protective coating (like an old stain or sealant), use medium-grit sandpaper.

Regular cleaning, rust-proof coatings, and checking fasteners help prolong the lifespan.