Skip to content
Interior of an octagonal gazebo with  dome roof built by sixteen arched rafters

How to build gazebos that nurture your spirit

Written by: Sam Goeku

|

Published on

|

Time to read 9 min

Elevate your backyard into a personal retreat with SamsGazebos octagonal gazebo kits

interior view octagonal gazebo with 1 x 6 T & G underlayment of pagoda roof
Image from SamsGazebos.com - Inside view of octagonal gazebo with pagoda roof 

Introduction

When I first began to build gazebos, I started with a hexagonal design, a six-sided structure. However, I wasn’t satisfied with it. Hexagon gazebos lack symmetry and don’t have the structural beauty I was seeking. Eventually, I lost interest in them and switched to building octagonal gazebos. It wasn’t because I was drawn to Feng Shui, where the octagon represents the unification of heaven and earth, prosperity, health, and rebirth. At 38, I had just completed my 40-foot sailboat with a cement hull after nine years of hard work and was searching for the next project in my life. I instinctively knew that building gazebos were the right fit for me, and that’s how my journey into building gazebos began.


In 1999, we landed a major contract with the U.S. Army in Washington, to build twenty 20-foot octagonal gazebos. While we had previously supplied gazebos for U.S. Army and U.S. Air Force bases locally, this was a game changer. It marked a turning point, pushing us to elevate our designs and recreate custom-quality gazebo kits that were optimized for easy assembly. I’ve always disliked products that come with an overwhelming number of parts to put together. Our approach is simple: fewer parts, easier assembly. Our gazebo kits can be put together in a day, with minimal pre-assembly required, making the process as streamlined and customer-friendly as possible.


Want to know more? Visit our sister store. www.SamsGazebos.com, custom gazebo kits.

Octagonal wooden gazebo with railings outside a multistory building
20-foot gazebos installed at a U.S. Army base in Seattle, WA
Workers assembling wooden gazebo posts, headers, and corbels beside a building
Assembling posts and corbels for a 20-foot octagonal gazebo kit
Close-up of a wooden gazebo rafter fitted into a notch in the header
Notches in the headers hold the rafters in place
Wooden gazebo roof frame being assembled in a workshop
Building rafters on the headers of a 22-foot octagonal gazebo
Close-up of wooden gazebo rafters meeting at the roof peak during assembly
The rafters meet at the peak, fitting neatly together
Worker tightening a metal strap around a wooden gazebo headers in the workshop
Tightening the headers with metal strap to keep the frame together
View beneath a painted gazebo roof showing sunburst panels, rafters, and a support columns
Sunburst panels and steel columns beneath the gazebo roof
Decorative gazebo arch panel with circular details between two columns
French ring arch panels fitted between the columns
Decorative curved corbels on both sides of a gazebo corner column
Gingerbread country corbels on steel columns
White gazebo arch panel with a pointed opening and lattice details
Gothic lattice arch panels between the posts
View into a white gazebo with curved corbels, round columns, and a hanging lantern
Country corbels on steel columns
Upward view of a white gazebo ceiling with radial rafters and crossing beams
Grid corbels 
Cream-colored octagonal garden gazebo with rounded arch panels, railings, seating, tile roof
Semicircular arch panels frame the gazebo opening
Natural wood gazebo with bell roof, rounded arches and lattice panels in a wooded garden
Semicircular arch panels with lattice backdrops
Upward view of painted gazebo rafters radiating from the center beneath the roof
Rafters support the pagoda-style roof
Large octagonal gazebo with a copper-colored roof, cupola, decorative arches, and railings
A cupola tops the copper-colored pagoda-style roof
Upward view of a white octagonal gazebo ceiling with exposed rafters and a hanging light
Inside an octagonal gazebo with a pagoda-style roof
White octagonal gazebo with a tiered roof, decorative arches, and railings beside a lawn
Copper-covered pagoda roof with steel columns and railings
Upward view through a gazebo dome with evenly spaced white slats and curved roof supports
Inside the louvered dome roof
White domed gazebo with lattice arches and decorative columns beside a swimming pool
Dome roof and cupola with Gothic arches and classic posts
octagonal gazebo circular headers for sixteen sided  dome roof
Circular headers of octagon gazebo with sixteen sided dome roof
Octagon gazebo with sixteen sided dome roof header details
Circular header of octagon gazebo
octagon gazebo  with sixteen sided dome roof header connections
Connecting headers for an octagon gazebo with sixteen rafters
inside view of octagon gazebo with circular headers and rafters
Inside of octagon gazebo with circular headers and rafters
Octagon gazebo with sixteen sided dome roof framing
Framings of octagon gazebo with sixteen-rafter dome roof
A man look at  1 x 6 underlayment being built on an octagon gazebo with sixteen-sided dome roof
Building 1x6 T&G underlayment on the framings of a dome gazebo
Partially copper-clad gazebo dome on the workshop floor with one section still uncovered
Fitting the copper panels over the dome roof frame
Side view of a gazebo dome section panels showing copper panels and curved wooden rafters on a pallet
Dome roof sections with copper panels and curved valley rafters
View from below the gazebo dome with sunburst corbels and steel columns showing curved rafters and white support columns against a blue sky
Sixteen rafters give the dome its graceful shape
Upward view of sixteen painted wooden rafters meeting at the center of the gazebo dome
Inside the dome roof supported by sixteen rafters
Worker on a ladder tightening a metal strap around wooden gazebo headers
Tightening a metal strap to hold the headers together
White octagonal gazebo with decorative corbels, railings, and a tile roof beside a house
Gazebo with country corbels, steel columns, and a tile roof
Octagonal wooden layout template on a workshop floor with post connectors at the corners
An octagonal template positions 8 post connectors for a gazebo with wooden posts
Braced octagonal wooden template with groups of upright anchor bolts at each corner
An octagonal template positions 32 anchor bolts for a gazebo with steel posts
White gazebo column with decorative base trim beside matching railings
Wooden trim around the steel column base conceals the steel plates and anchor bolts.
Close-up of a gazebo steel column base bolted to concrete beneath wooden cladding
The steel plate and anchor bolts are concealed by wooden boxes for safety and a finished appearance.

1. How to build gazebos where engineering and aesthetics come together

How I build octagonal gazebos

Key elements of octagonal gazebos

  • Rafters: In the early days, I used to build gazebos the traditional way—using headers to sandwich the rafters, which were then joined at the top by a cupola. This method caused major assembly challenges, particularly at the top of the ladder, where the posts were unstable. Eventually, I started notching the rafters at top and bottom: one to hang the roof panels and the other to lock the rafters into the headers, making it a breeze to assemble large octagonal gazebos on roof top.

  • Headers: Over time, I transitioned to double headers, which consist of a horizontal member sitting on a post and a vertical one where the rafters rest. The notches in the top headers securely catch the rafters at an angle, and the hanger bolts at the top of the posts made assembly much more manageable, even when working on tall ladders.

  • Rafter Joints at the Peak: I soon abandoned the cupola that previously held the rafters together, opting instead to have the rafters meet at the peak. This required cutting the rafters to precise lengths and angles. It’s highly technical work—knowing the precise length and angles is one thing, making such piece is another. There’s nothing more satisfying than seeing eight rafters of an octagonal gazebo perfectly join at the peak. I recall struggling to convince my structural engineer, Jack, how the rafters literally support each other at the peak. Ultimately, I ended up adding metal straps at the peak for structural purposes, which concealed the perfect rafter joinery. He was not always right, though.  On one occasion, he specified 4x3’s for the valley rafters, but there wasn't enough space for that. He must have overlooked the fact that the notches on the rafters and headers fit closely together, which lowered the roof position. As a result, we had to use the same material sideways as 3x4’s for a better fit.

  • Posts: My engineer insisted on bulky wooden knee braces for gazebos with the wooden posts. This became an issue when a landscape architect specified an octagonal gazebo with wooden posts and decorative butterfly braces. To address this, we had to design decorative braces to conceal the unsightly big fat knee braces. While wooden posts were my initial preference, I soon realized that steel posts with anchor bolts eliminated the need for these big braces. This change was a huge relief, especially when we began fabricating large octagonal gazebo kits for other contractors to assemble on job sites and realized that they don't always install those big knee braces.

  • Templates: The idea for my templates came about by accident. A contractor needed to pour concrete and set post connectors, but I wasn’t available. Diagrams with dimensions alone weren’t enough to help others position the post connectors or anchor bolts correctly. So, I created templates to make the process easier for contractors. These templates helped them position everything correctly at level to each other, streamlining the octagon gazebo assembly process.

  • Octagon Dome Gazebos with Sixteen Rafters: My engineer was initially skeptical of my design for a 16-rafter octagonal gazebo (O-16), due to its complex engineering requirements. The design featured sixteen rafters on eight one-eighth circular-shaped headers, supported by eight posts to create a graceful dome. He called for bulky wooden braces between the rafters and tons of metal hardware. Fortunately, most of these connectors were concealed inside the gazebo, so they didn’t interfere with the final appearance.

  • Metal Strapper: When building gazebos, I use a metal strap around the lower headers and tighten the fit with a metal strapper. This is a very useful tool, keeps the headers from falling apart while I assemble the rafters and roof panels. I leave the straps in place until the roof is finished.

  • Fasteners and metal connectors: My engineer often insists on adding metal connectors to simplify his calculations. While it’s not my preferred style to use visible metal hardware, I’m willing to incorporate them when absolutely necessary—typically for building permits or structural reasons.

  • Hidden joinery: The beauty of my gazebos goes beyond their distinctive designs, with the real magic found in the intricate hidden joinery and multi-angled cuts that set them apart. Take the post boxes, for example—the hidden joinery is designed to keep them secure over time, using techniques inspired by boat building. These careful, thoughtful details are what truly distinguish SamsGazebos products.


"“Stay hungry. Stay foolish.”

Steve Jobs

Product we recommend

wooden bridge with lattice railings over a stream
Image from SamsGazebo.com
Wooden bridge over pond by Maple trees
Image from SamsGazebo.com

2. The Other things to consider

Railing placement

Octagonal gazebos are symmetrical, allowing you to add 3, 5, 6, or 7 railings based on your preference. For optimal Feng Shui, avoid positioning entrances toward the northeast (Kimon: demon's gate) or southwest (Ura-Kimon: demon's exit), as these are considered danger zones.

Product we recommend

“Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven’t found it yet, keep looking. Don’t settle. As with all matters of the heart, you’ll know when you find it.”

Steve Jobs

An arched Japanese bridge with climbing roses over  a pergola
Image from SamsGazebo.com
A red Japanese bridge spans a pond with water lilies
Image from SamsGazebo.com

3. Functional Garden Structures

Japanese Garden Bridges

A gracefully arched wooden Japanese garden bridge makes a focal point, attractive destination in your garden, a great wood element to your pond or walkway. Japanese pond bridge kits from SamsGazebos® work well with the Japanese theme, are available for fast delivery.


Japanese Torii Gates

A rustic wooden torii gate gracefully frames the entrance to your backyard, inviting peaceful contemplation.  Japanese torii gate kits from SamsGazebos® work well with the Japanese bridge theme.  Wooden Japanese torii gate kits  are available for fast delivery.


Water Wheels

A revolving water wheel gently turns in the pond is a captivating attraction, its rhythmic motion enhances the serene atmosphere, and a great addition to your Japanese theme.

All water wheels from SamsGazebos® include stands, free-standing, and ready to set for your water flow. We are one of few that fabricate long-lasting water wheels.

Summary: Tips to create a retreat with an octagon gazebo

Key to success: Find a quality gazebo kit online that fits your lifestyle, taste, and budget.

The most critical: Start by building a level floor or adjusting the post length at the beginning.

Smart move: Consult a landscape professional to create a comprehensive design layout.

Product we recommend

Conclusion

At SamsGazebos®, we provide a diverse range of handcrafted garden structures that are made in the USA, designed for coordination with your outdoor space. Please feel free to contact us for any questions about gazebos.   info@samsgazebos.com  All the images are provided by SamsGazebos®.

Curving hull material

The author : Sam Goeku

Founder and designer of SamsGazebos®, is a fourth-generation boat builder from Okinawa, Japan. He has built four sailboats, including one with a cement hull and three with wooden hulls. Passionate about woodworking, he specializes in crafting high-quality garden structures incorporating unique hidden joinery techniques he developed from his boat-building. With decades of experience in crafting durable and elegant structures for homeowners, builders, and merchants, he shares his expertise on creating serene outdoor living spaces.

Frequently Asked Questions

What is the most important to build gazebos?

The most important factor in building a gazebo is ensuring a level foundation. If the ground isn’t perfectly level, you’ll need to adjust the length of the posts or make sure the post connectors are set level with one another.

Is it difficult to build gazebos?

Constructing a polygon-shaped gazebo can be challenging. We recommend starting with a square or rectangular gazebo first, as it involves simpler 90-degree angles. Many people struggle to complete the roof because the posts aren't set level with each other or aren't angled correctly, which prevents them from finishing the project. Consider investing a decent gazebo kit.  SamsGazebos offers  custom quality gazebo kits online.  Visit our webstore: www.SamsGazebos.com

What is the best way to ensure post connectors or anchor bolts are level with each other?

Order a template from SamsGazebos.com to help position and angle the post connectors correctly and level them. On the job site, we usually use a simple water level setup—just water, a clear tube, a wooden stick, and a bucket. Water is reliable and accurate, so no expensive tools are necessary.

Do I need a building permit for a gazebo?

Most cities require a building permit for any permanent structure larger than 120 square feet.  Check with a building department in your area. 

Product we recommend

SamsGazebo.com Handcrafted Japanese bridges

Elevate your backyard with a Japanese water wheel

Ready to transform your home with beautiful basics? Explore Bramble & Thyme's curated collection of timeless essentials.

Bring the cozy cottage charm into your house today!

Shopping Cart

Your cart is currently empty

Shop now