Freestanding timber pergola with triple-post corners and arched barrel roof beside a poolside patio, built from Douglas Fir with Rich Cordoba stain. — A custom 20×20 Douglas Fir pergola featuring triple 10×10 posts, a graceful arched barrel roof, and Rich Cordoba stain — designed for lasting poolside shade and style.

Ultimately, this freestanding timber pergola is more than a shade structure — it’s a centerpiece for outdoor living. Designed for poolside enjoyment, it provides a cool, shaded retreat just steps from the water.

Built from robust Douglas Fir timbers in the 8,000 Series, the structure spans 20′ x 20′ with an 18′ x 18′ footprint. Its signature arched barrel roof adds graceful curves that soften the strong, architectural lines while maximizing overhead shade coverage.

One of the standout features is the triple-post configuration on each corner. These substantial 10×10 posts not only make a bold visual statement but also deliver unmatched stability. The posts are anchored with heavy-duty knife plates to custom footings, ensuring the pergola remains rock-solid in every season.

Backyard Space Before Pergola Installation

Backyard poolside patio area before installation of triple-post timber pergola with barrel roof, showing lawn, pavers, and seating area. — The poolside patio and lawn before the custom triple-post timber pergola with an arched barrel roof was installed.

Completed Triple-Post Barrel Roof Pergola

Front view of custom triple-post timber pergola with arched barrel roof beside a poolside patio, crafted from Douglas Fir with Rich Cordoba stain. — A front perspective showcasing the triple 10×10 posts and arched barrel roof of this custom timber pergola, designed for poolside shade and style.

Triple Posts and Barrel Roof Design

Other design highlights include:

Arched barrel roof for elegant curves and enhanced shade.
Triple 10×10 posts on each corner for bold style and rock-solid strength.
Rich Cordoba stain to accentuate the wood’s natural grain.
Roosevelt beam profile for a classic, craftsman-inspired edge.
Arched knee braces that echo the roofline and add structural integrity.
Carefully spaced shade planks for a perfect balance of sunlight and shade.
Integrated TimberVolt® Inferno power post for poolside lighting, ceiling fans, sound systems, or device charging.

Set beside the paved patio and lush lawn, this pergola blends beautifully with its surroundings — offering a year-round gathering spot for relaxing after a swim, hosting guests, or enjoying the outdoors in style.

Timber frame dovetail joint with interlocking design labeled patent pending — The Dovetail Difference® is Western Timber Frame’s exclusive patent-pending interlocking joinery—crafted for unmatched strength without metal brackets.

the Dovetail Difference®

Every timber connection is precision-cut using The Dovetail Difference®, our signature interlocking joinery that creates a tighter, stronger, and more beautiful connection. This level of engineering isn’t just perfect for residential backyards — it’s built to commercial-grade standards, ideal for resorts, community pools, and hospitality spaces where beauty and durability must work together.