Island Jumbo Wood Post Cap (7" to 10") Cedar, Redwood, Mahogany

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Wood Type: Cedar
Post Size: 7"
Sale price$61.00 Regular price$71.92


The Island jumbo wood post cap is available in sizes to fit a 7x7, 8x8, 9x9, and up to a 10x10 post, in full and 1/2 sizes, in your choice of premium materials: Cedar, Redwood, or Mahogany. The Island post cap is a top-selling style offering a simple layered flat top design with squared edges. Each handcrafted post cap is made in the USA, sanded smooth, and made from the finest materials: western red cedar or all-heart clear vertical grain redwood. Slips over the top of your posts for easy DIY installation.

The Island post cap is fabricated to fit large posts measuring 7” to 10” square in full and half sizes. See table below for actual product dimensions.

Click here for post or post sleeves measuring 3-1/2” to 6-1/2” square.

Custom sizes available: Call or email us at for details, pricing, and availability.

Product Details:

  • Qty: 1 Wood Post Cap
  • Post Cap only - NOT a light
  • Materials:
    • Clear, Vertical Grain Cedar 
    • Clear Redwood
    • Kiln Dried African Mahogany
  • Cedar and Redwood must be treated prior to being installed
  • Cedar and Redwood caps available in 7" to 10" sizes
  • Mahogany caps are available for  7", 7-1/2" and 8" posts only
  • Slip over style for easy installation
  • Made in the USA
  • Manufacturer: Nantucket Post Cap
  • One year manufacturer warranty

Product Dimensions:

Order by post size: Measure the length and width of your post for the best fit. Post Cap opening will be 1/8" larger to allow the wood to naturally expand and contract.

*All measurements shown in inches. 

Post Size Opening Size Moulding Height Product Size (LxWxH)
7" 7-1/8" 1.1"
9.25 x 9.25 x 2.5
7-1/2" 7-5/8" 1.1" 9.75 x 9.75 x 2.5
8" 8-1/8" 1.1" 10.25 x 10.25 x 2.5
8-1/2" 8-5/8" 1.1" 10.75 x 10.75 x 2.5
9" 9-1/8" 1.1" 11.25 x 11.25 x 4
9-1/2" 9-5/8" 1.1" 11.75 x 11.75 x 4
10" 10-1/8" 1.1" 12.25 x 12.25 x 4



Post caps are made of clear, vertical grain, kiln-dried redwood, clear western cedar, or kiln-dried African mahogany. These wood types are known for their beauty and durability in harsh environments. Cedar resists mold and mildew, plus its low density makes it less likely to swell, warp, cup, or twist, as compared to other softer wood types.  

Product Care:

Nantucket wood products are sold in their "natural" state so they can be stained or painted to match or coordinate with any project. Because post caps are installed horizontally on top of the post, they receive the most sun exposure. Although you may leave cedar posts to weather naturally, to meet warranty requirements all cedar and redwood items must be treated prior to being installed. Apply an exterior urethane stain or paint to all surfaces, including inside and under the base, to ensure long life. Many semi-transparent seals are available for cedar to maintain its natural look, while still protecting the caps.


For a nail-free look, simply apply an exterior marine adhesive like 3M 5200 to the top of the post and slip the post cap over. Stainless steel finish nails may be used as an alternative.



This product ships directly from the manufacturer's warehouse in Vermont. Caps are built after the order is received. Orders typically ship in 1-4 business days via UPS Ground and will arrive within 1-5 business days from the ship date. 

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