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The depth of your post hole depends on your post length. If you decide on a two-rail fence, the posts are likely 6 feet long. You want your hole to be at least 1/3 of the post length. In this case, your post hole should be two feet deep.

If you opt for a three-rail fence, the posts will typically be 7 feet long, meaning your post hole should be 28 inches deep.

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.

To effectively keep animals out of your yard with a fence, choose a fence that anchors to the ground to deter digging. Also, consider adding a barrier below the fence to prevent burrowing. 

To make your yard less desirable to animals, eliminate food sources like a vegetable garden, and ensure your garbage cans are sealed and tamper-proof. Installing motion-activated devices like lights or sprinklers will startle animal intruders. Also, a fence won’t work well if you forget to keep gates closed and secure. If you still face persistent animal intrusion issues, contact a wildlife control expert who can offer specialized solutions.

You can reuse chain link fences as long as they’re in good condition. The best part—reusing it helps you make the most of the cost of a chain link fence. Whether you want to reuse it or consider asking someone to remove it for you in exchange for a free fence, it’s possible. If you can’t find a location for it in your yard, you can repurpose a chain link fence by donating it to a local animal shelter or community garden.