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The average lifespan of a wood fence is 15 to 20 years, but some can last for 40 years or more depending on several factors. The type of wood is crucial; for example, untreated pine may only last 5 to 10 years, while pressure-treated pine can last up to 20 years, and cedar's natural resistance can extend its life to 40 years. Other factors include local weather conditions, with wet and windy climates causing faster deterioration, and the quality of maintenance. Higher-end wood, metal posts, and privacy fence styles also tend to last longer.

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.

There are several options for post materials. Depending on where you live, the weather, and what kind of durability you want, you can choose from wood, steel or concrete posts for a barbed wire fence. Your corner and end posts should be especially strong in order to maintain the structural integrity of the fence. 

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.