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When it comes to aluminum fence post depth, the posts should typically be about one-third of the length of the fence post deep into the ground. However, it's always best to check with your fencing manufacturer's recommendations to ensure you install it at the recommended depth for stability.

While they can be closer, the maximum distance between fence posts for residential fences is 8 feet. This ensures the panels are adequately supported by the fence posts. This is usually dictated by the width of the panel, which is typically between 5 and 8 feet. While narrower panels will require more posts, they’ll be lighter and easier to work with than wider panels that are the same height.

A fence post set in concrete lasts anywhere from five to over 25 years, depending on how well the concrete was applied and the fence post’s material. Untreated wood posts in concrete could last less than 10 years, but a durable, treated wood set in properly applied concrete could last a few decades. However, all fence posts will wear out eventually, so expect to need to replace your fence post every five to 15 years.

Whether you need a permit to build or install a fence depends on several factors, including your location, the fence's height, its placement in your yard, and the materials used. In many cities and highly populated areas, a permit is required, especially for fences taller than 6 feet. Conversely, rural areas may have fewer restrictions. Typically, backyard privacy fences 6 feet or shorter do not require a permit, while front yard fences often have a lower height limit, sometimes as low as 3.5 feet. There can also be exceptions for properties in mixed residential-commercial zones. It's best to check with your local building inspection or zoning department to understand the specific requirements, height restrictions, and location rules for your area. A professional fence installer can help you navigate this process and often secure the necessary permits for you, though this may extend the project timeline.