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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.

While power washing isn't a requirement before you stain a fence, it can make the job much easier and faster while reducing manual labor requirements. The stain will not work if the wood is full of dirt and dust, so power washing, sometimes called pressure washing, is a fast and effective way to prepare the wood for staining. Remember that you need to stain or repaint relatively soon after the wood has dried so that there isn’t time for dust and dirt to build up again. 

Since wood is weaker when installed horizontally versus vertically, a horizontal fence is prone to sagging. You can prevent this drooping from happening by building a sturdier fence. Use softwoods that are more stable, such as cedar and redwood, or denser hardwoods for your fence materials. If you can’t afford these pricey materials, use thicker two-by-six pressure-treated pine boards or shorten the span the fence boards have to cover by installing more posts.

In the vast majority of cases, chain-link fences are less expensive than wood fences. Installing a wood fence costs anywhere from 20% to 30% more than a chain-link fence, or an average of $3,100, whereas a similarly sized chain-link fence will average around $2,400. Even with add-ons and additional protective finishes, a chain-link fence is very likely to cost you less than a wood fence. The only exception would be a split rail wood fence, which can cost about half the price of a chain-link fence or less.