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Posts for a horizontal fence should be no more than 6 feet apart. Wood pickets are not as strong when mounted horizontally as when mounted vertically. As such, the fence panels on a horizontal fence can’t cover the same span between posts as a vertical fence can. If you install the posts further apart on a horizontal fence, the fence will lose stability, making the boards more likely to sag. 

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.

Privacy fences in residential neighborhoods tend to stand between 6 and 8 feet tall, but local building code usually dictates the maximum height. Livestock fences that border large land plots range from 3 to 6 feet. Shorter, decorative fences, which are common in front yards, are around 3 feet tall, on average. Fence height also tends to vary by material, with wood fences usually sitting at 6 feet tall, and chain-link and wrought iron fences tending to sit at half that.

How long a fence lasts, including a split rail fence, will depend on the material from which it’s made. The average lifespan of a wood fence is about 15 to 20 years. However, split rail fences made out of premium materials, like composite, vinyl, steel, or aluminum, can last for 25 to 30 years or more, especially if you take good care of the material and carry out necessary maintenance.