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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.

Most homeowners don't need to inform their neighbors before constructing a fence, according to the law, but you will need to make sure that you’re building on the property line or on your side of the property line. Otherwise, the neighbor could complain, which would require you to tear down and reinstall the fence. In any case, keeping them in the loop is the neighborly thing to do!

Whether you inform your neighbors or not, always use property records and a land survey to ensure your fence stays within your property boundaries.

Who pays for a new fence between neighbors depends on its location relative to the property line. If you build the fence entirely on your property, you are solely responsible for the costs of installation, maintenance, and repair. If the fence is built directly on the property line, both neighbors are typically responsible for the costs. In this case, it is essential to consult with your neighbor beforehand to agree on a plan for payment. While you should always inform your neighbor of your plans in advance, you generally cannot force them to contribute financially unless there are specific local laws, such as in California, where both parties might be responsible for costs unless a different agreement exists. It's a good idea to get a property line survey to know the exact boundaries before building.

Knowing how close to the property line you can build a fence is an important planning step in your fence installation project. In many U.S. states, you are allowed to build a fence directly on the property line as long as your neighbor signs off on the plan. But check with your state government because some states and municipalities require a couple of inches before your property line.