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1It's a longer-term decision than it feels like
A properly built, well-maintained fence should last 25 to 50 years — which is exactly why the planning step (the line, the material, the depth) matters more than the speed of the build.

A properly built, well-maintained fence should last 25 to 50 years — which is exactly why the planning step (the line, the material, the depth) matters more than the speed of the build.
Set an end post at each corner and stretch a string or a single wire tight between them before anything else goes in the ground. Every other post gets set relative to that line, not eyeballed one at a time.
Line posts are commonly spaced about 10 to 12 feet apart for most fence types; tighter spacing handles uneven ground and tight curves better than wide spacing does.
Wooden line posts should be set at least 2 feet deep, preferably deeper, centered in the hole before tamping so the soil packs evenly all around — an off-center post tamps unevenly and leans within a year or two.
Corner and end posts carry the tension of the whole fence line and need real bracing; on a long run, a braced post assembly gets added periodically along the line, not just at the two ends, so the whole fence doesn't rely on two posts to stay tight.
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