Proper post spacing is essential for building a straight, stable, and attractive aluminum fence. Even a small measurement error can prevent panels from fitting correctly, create uneven fence lines, or interfere with gate operation.
For most standard aluminum fencing systems, posts should be spaced 72.5 inches apart, center to center. However, the exact layout may change near gates, corners, slopes, and fence runs that are not evenly divisible by six feet.
Standard Aluminum Fence Post Spacing
Most residential aluminum fence panels are manufactured in six-foot sections. To accommodate the panel rails and the width of the posts, post holes are generally spaced 72.5 inches on center.
“On center” means measuring from the center of one post to the center of the next post, not from the inside or outside edges.
Before digging, review the complete aluminum fence installation guide and confirm the measurements for your specific fence style. Product dimensions can vary, so the layout should always take priority.
How to Mark Post Locations
Start by placing stakes at all end-post, corner-post, and gate-post locations. Run a string line between the stakes to establish a straight fence path.
Using a tape measure, mark each line-post location at 72.5-inch intervals. Center every post hole along the string line to keep the fence aligned.
The step-by-step installation guide recommends installing one post and one panel at a time. This approach allows you to verify spacing and make small adjustments before the concrete sets.
When Should Fence Post Spacing Be Adjusted?
Not every fence run will divide evenly into six-foot sections. For example, a 10-foot run requires two panels, with one panel cut to fit the remaining space.
Avoid changing the spacing across several sections to absorb the difference. Instead, maintain the recommended spacing for full panels and trim the final panel in the run, unless it’s less than 2’. Then starting with a 4’ panel and ending with a 4’ panel to avoid a small panel at the end.
Post placement may also require adjustments around:
- Corners and changes in direction
- End posts near buildings
- Gate openings
- Curved fence lines
- Sloped or uneven terrain
Different end, line, corner, and gate posts should be positioned throughout the layout.
How Far Apart Should Gate Posts Be?
Gate-post spacing is based on the gate’s opening size rather than standard panel spacing.
For a single gate, add 1/4 inch to the listed gate width. A 36-inch gate, for example, requires a 36.25-inch opening measured between the inside faces of the gate posts.
Double gates are typically manufactured to fit the stated opening, so the additional 1/4 inch is not required. Gate posts should also be fully secured in concrete because they support the gate’s weight and repeated movement.
Plan Your Post Layout Before Digging
Accurate aluminum fence post spacing begins with careful planning. Measure each fence run, identify gates and corners, mark underground utilities, and verify the panel dimensions before digging any holes.
For standard six-foot panels, begin with posts spaced 72.5 inches on center, then make deliberate adjustments for shortened sections and gate openings. Consider an aluminum fence installation guide to help you create a fence line that is straight, secure, and built to last.