Shadowbox Fence Calculator — Alternating Picket Layout
Estimate pickets and rails for a shadowbox fence — alternating boards on both sides of the rail for two-sided privacy, airflow, and good-neighbor appeal.
Enter Dimensions
Standard dog-ear picket: 3.5 in
Privacy fence: 0 in · Standard: 0.5 in
Results
Fence Posts
14posts
Rails
26rails
Pickets
330pickets
Sections
13sections
Each section = 8 ft wide
Editorial Standards
Each calculator is reviewed for formula accuracy, unit consistency, and alignment with current U.S. building practices before publication. We verify outputs against published engineering references and real-world project data. Learn more about our methodology.
Shadowbox fence — also called "good neighbor" fence — places pickets alternating on both sides of the rails. The aesthetic advantage: it looks identical and finished from either side of the property line, so neither neighbor gets the "ugly back" view. The functional advantages: airflow (won't act as a wind sail during storms) and bilateral privacy from straight-on angles.
This calculator counts the doubled picket count for shadowbox layout. For traditional single-sided fences, use the parent Fence Calculator or Privacy Fence Calculator.
How to Estimate a Shadowbox Fence
Pickets (shadowbox) = Length × 4.36 × (1 + waste %). Posts = ⌈Length ÷ 8⌉ + 1. Rails = 2 × Length.
Shadowbox vs Butted Comparison
- Picket count: 4.36/LF (shadowbox) vs 2.18/LF (butted)
- Material cost: 60-80% higher than butted
- Aesthetics: identical from both sides
- Privacy: Full at straight-on; reduced at sharp angles
- Wind load: ~50% less than solid-butted (airflow gaps)
- Waste factor: 12-15% (more perimeter cuts)
Frequently Asked Questions
What is a shadowbox fence?
A shadowbox (also called "good neighbor") fence has pickets alternating on both sides of the rails — typically every other picket position. The result looks finished from both sides (no "ugly back"), maintains privacy from straight-on angles, and allows airflow.
How many pickets in a shadowbox fence?
Roughly 2× a butted fence — pickets on both sides of the rails. For 5-1/2 inch pickets at standard layout: 4.36 pickets per linear foot (vs 2.18 for butted single-sided). Total picket count doubles.
Is shadowbox more expensive than regular fence?
Yes — material cost is 60-80% higher than butted privacy fence due to the doubled picket count. Labor is similar; you place the same number of pickets but on both sides. Aesthetically, the cost premium is worth it for many homeowners.
Does a shadowbox fence allow privacy?
From straight-on, yes — alternating pickets fully overlap when viewed perpendicular to the fence. At sharp angles (looking down the fence line), you can see through. This is the trade-off for airflow and bilateral aesthetics.
How are shadowbox pickets attached?
Same as butted fences — screwed or nailed to top and bottom rails. The alternating pattern means rails take fasteners on both sides; use longer fasteners (2-1/2 inch for picket-to-rail vs 2 inch standard) to ensure full engagement.
Looking for the general calculator?
Calculate fence posts, rails, and pickets for any wood, vinyl, or chain-link fence. Enter total run length and spacing for an instant material takeoff.
Open the Fence Calculator: Posts, Rails & Pickets →