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The cheapest farm fences are typically wire fences, which cost less to install than traditional lumber fences. Barbed wire is one of the most inexpensive options due to its simple materials, making it a good choice for low budgets. It is suitable for confining docile animals in large spaces, as it provides a visual barrier and a mild deterrent. Other options like hog wire and woven wire fences are also cost-effective because they require less lumber than a full wooden fence. These types of wire fences are strong, long-lasting, and relatively easy to repair, though they are often considered less aesthetically pleasing than wood.

The lifespan of a fence can range from 5 to 50 years, depending heavily on the material, local climate, and how well it is maintained. For example, a wooden fence might last 7 to 15 years, while a vinyl fence typically lasts 20 to 30 years. Metal, composite, and glass fences have some of the longest lifespans. Proper maintenance, such as regular cleaning, inspections, and staining or sealing for wood, is key to extending the life of any fence material. Vinyl and composite are durable options that don't require sealing.

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. 

Galvanized metal, vinyl, and composite fences are known to be the longest-lasting options, often surviving for over 30 years with proper care. Metal fences, including galvanized chain link and aluminum, can look great for decades because the galvanization process adds a protective coating that resists weather and pests. Similarly, vinyl and composite materials are resistant to pests and can withstand harsh weather for many years. In comparison, a typical wood fence lasts about 15 years, and a standard vinyl fence has a lifespan of 20 to 30 years.