How Far Apart Should Fence Posts Be?
Short answer: 6–8 ft for wood privacy, panel-width (usually 6 ft) for vinyl, 8–10 ft for chain-link line posts, and 6–8 ft for pre-assembled aluminum sections. Tighter spacing is always OK — wider is what gets fences into trouble.
Spacing by material
- Wood privacy (board-built): 6–8 ft. Rails span between posts, so wider spacing means more rail sag. 8 ft is the classic default for 6 ft fences.
- Vinyl panels: exactly one panel width per bay (6 ft typical). The routed posts are part of the system — don't improvise wider bays.
- Chain link: 8–10 ft for line posts, with a terminal post at every end, corner and gate. Fabric tension spans the line posts.
- Aluminum sections: 6–8 ft, again matching pre-assembled section widths and bracket systems.
What forces tighter spacing
- Fences taller than 6 ft (more wind load on every post).
- Open, windy sites — spacing down one notch.
- Heavy gates: gate posts carry real weight; some builders double them.
- Soft or sandy soil: closer posts share the load.
Worked example
A 200 ft wood privacy fence at 8 ft spacing needs ceil(196 ÷ 8) = 25 spans for 196 ft of effective run (after a 4 ft gate) — see how many posts that is. The same fence in chain link at 10 ft spacing needs only 20 spans.
Spacing affects everything downstream
Post spacing drives post count, rail count (rails per span) and concrete volume. Try it live in the post calculator or the full fence calculator — adjust spacing and watch every line item update.
FAQ
Can I space wood fence posts 10 ft apart?
For a 4 ft picket fence with stout rails, sometimes. For a 6 ft privacy fence, 10 ft spacing invites sagging rails — stay at 8 ft or less unless the rail spec says otherwise.
Does spacing change with fence height?
Indirectly — taller fences catch more wind. Above 6 ft, tighten spacing toward 6 ft and verify post depth against your local frost line.