Post Cap Installation
The top of a fence post is the single most vulnerable spot on a wood fence — and the most often ignored. A properly fitted cap takes 5 minutes to install and can add years to every post in your fence line.
Why Post Caps Matter
End Grain Absorbs Water Like a Sponge
The cut top of a post has exposed wood fibers running straight to the center. Without a cap, every rain event drives moisture deep into the post — accelerating rot from the inside out.
Extend Post Life by Years
A $6 cedar cap on a $30 post is one of the best returns in home maintenance. Properly capped posts can last 10–15 years longer than uncapped posts in the same conditions.
Finishing Touch That Elevates the Whole Fence
Capped fence posts look intentional and professional. It's a small detail that makes a big visual difference, especially at entry gates and corners.
Post Cap Styles & Sizes
We carry caps for 4x4 (3.5" actual) and 6x6 (5.5" actual) posts. Custom and 5x5 sizing available on request.
Flat Cedar Cap
The classic choice. Solid cedar, beveled edges to shed water. Blends naturally with a cedar or pressure-treated fence. Most economical option.
Sizes: 3.5" (4x4), 5.5" (6x6)
Est. price: $4–$8 each
Pyramid / Gothic Cap
Tapered pyramid top that channels water away efficiently. Slightly decorative profile that works well on both privacy and picket fences.
Sizes: 3.5" (4x4), 4.5" (5x5), 5.5" (6x6)
Est. price: $6–$14 each
Vinyl Post Cap
Snap-on PVC cap — rot-proof and maintenance-free. Common on vinyl fences but also used on wood fence posts for a clean, white accent.
Sizes: 3.5" (4x4), 5.5" (6x6)
Est. price: $5–$12 each
Solar LED Cap
Charges via built-in solar panel and glows at night — adds safety lighting and a finished look. Popular on entry gates and deck posts.
Sizes: 3.5" (4x4), 5.5" (6x6)
Est. price: $18–$35 each
Copper Cap
Premium finish that patinas to a rich verde over time. Used on custom fences and entry posts for a high-end appearance.
Sizes: 3.5" (4x4), 5.5" (6x6)
Est. price: $20–$45 each
Turned / Routed Cap
Decorative profiles — ball top, finial, or bullnose — for traditional or Victorian-style picket fences.
Sizes: Custom sizing available
Est. price: $10–$30 each
How to Measure Your Post
Lumber is sold by nominal size, not actual size. Here's the quick guide:
4x4 Post
Actual: 3.5" × 3.5"
→ Order: 3.5" cap
5x5 Post
Actual: 4.5" × 4.5"
→ Order: 4.5" cap
6x6 Post
Actual: 5.5" × 5.5"
→ Order: 5.5" cap
Professional Installation Includes
- Measure all posts and confirm correct cap size
- Clean and prep post tops
- Apply construction adhesive for secure bond
- Nail or screw caps in place
- Seal exposed gaps with exterior caulk
- Inspect every post cap after installation
Supply & Install Bundle
Let us source the right caps for your post size and install them in a single visit. No need to measure, order, or wait for delivery.
Get a Supply & Install QuoteAdd Post Caps to Any Fence Service
Installing caps is quick — add them to any other repair visit (staining, picket replacement, post replacement) at no extra trip charge.