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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.

The ideal spacing for four-by-four residential fence posts is usually about 6 to 8 feet between posts. However, if the fence is particularly high or you live in a very windy region, you might want to space them closer together for better stability. A fence pro can help you decide on your post spacing. 

You can use soil and gravel instead of concrete when setting fence posts. However, concrete is more durable and longer lasting, so it's worth considering if you want your fence to withstand the test of time. You should especially consider concrete if you live in a region that experiences severe weather, which can damage your fence.

The average cost to install a fence is between $1,800 and $4,500. However, the price can vary significantly based on several factors. For a small DIY project, costs could be as low as $450, while fencing a large property like a 5-acre yard can exceed $43,000. Key factors that influence the total cost include the fence's size and height, the material used, the complexity of the design, site preparation needs, and any additional features like gates. The cost of raw materials, manufacturing, and custom fabrication can also impact the final price.