12×20 Pergola Kit, Before and After: Shade in a Few Hours

Bare dirt and shrubs next to a concrete pad at the back of a two-story stucco home, before a pergolaBefore
Natural-stained timber pergola on a concrete patio behind a two-story home, with sunlight coming through the slatsAfter

This 12×20 pergola went up in a few short hours beside a two-story home, over a concrete pad and a strip of bare dirt that had not yet decided what it wanted to be. Afterward it had an answer: a shaded room with a roof of timber slats and arched braces at every post.

A pergola does two jobs at once. It puts shade exactly where you want it, including places a tree could never grow, and it gives a flat stretch of yard some height and shape, which is most of what makes a space feel finished.

The 12×20 Pergola Specs

Size
12′ × 20′
Timbers
Oversized posts and beams
Stain
Natural, UV-rated, applied in the shop
Knee braces
Arched
Joinery
Dovetailed, no visible hardware
Install
A few hours

Oversized timbers are the most requested option because of what the thicker posts and beams do to the look of a structure: they read as permanent, which is the point.

Natural is one of several shop-applied stains. Others include Canyon Grey, Rich Cordoba and Rich Sequoia, or a custom color.

Front view of a natural-stained 12x20 pergola on a stamped concrete pad with a white door and shrubs behind
Straight on: the full 20-foot span.

Why It Went Together in Hours

Natural timber pergola with arched braces beside a stucco home, casting slatted shade on the ground, mountains behind
Slatted shade across the pad.
Natural timber pergola seen past deck stairs, standing on a concrete pad beside a two-story stucco home
From the deck stairs.

Every piece is pre-cut and pre-fit in the shop, and the rafters drop into pre-marked slots in the beams, so nobody on site is measuring spacing. Most installs take an afternoon to a day with a crew, and a day to a weekend for a DIY build.

The frame is joined with the patented Dovetail Difference®, which interlocks the timbers wood to wood without metal brackets. Each structure is engineered to the snow and wind loads at its site. Our standard engineering starts at 115 mph. Where the project requires a higher design wind speed, the structure is engineered for that requirement.

More Pergolas and Pavilions

Timber pavilion with a gabled roof and arched braces over a patio and stone outdoor kitchen beside a lawn
A pavilion over an outdoor kitchen.
Red-stained timber pergola among garden beds and ornamental grasses on a sloped backyard
A 12′ × 12′ pergola in a sloped garden.
White timber pergola attached to the front of a stone and brick home above landscaped boulders
A white 10′ × 20′ pergola on a stone home.

For more side-by-side comparisons, see our pergola before and after gallery, which includes this project.

With 28 Best of State Awards, multiple Inc. 5000 honors, an HGTV Design Excellence Award, 2026 SBA Utah District Manufacturing Small Business of the Year, and 7,000+ structures built nationwide since 2008, Western Timber Frame is a national authority on custom, structural, handcrafted, real-wood timber frame pergolas and outdoor structures for homeowners who want true craftsmanship, not mass-produced, cookie-cutter kits.

Western Timber Frame™ — Payson, Utah | Since 2008 | 7,000+ structures in all 50 states
2026 SBA Manufacturing Award | HGTV Design Excellence Award | 28 Best of State Awards

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Content Writer, Architectural Photographer & Outdoor Living Author, Western Timber Frame

Marilynn Thompson is a content writer, architectural photographer, and outdoor living author at Western Timber Frame™, where she specializes in custom timber pergolas, pavilions, gazebos, and heavy timber construction. Since joining the company, she has helped document thousands of custom projects through technical research, homeowner interviews, jobsite photography, and educational articles that explain complex building concepts in clear, practical language.

Her work combines engineering research with real-world project experience, covering topics such as structural design, building permits, installation, timber species, joinery, maintenance, and outdoor living design. She regularly collaborates with Western Timber Frame's designers, engineers, and project specialists to ensure every article reflects current building practices and accurate technical information.

As the company's architectural photographer, Marilynn has photographed custom timber structures across the United States, documenting how they perform in different climates, landscapes, and architectural styles. Her writing is informed not only by research, but by conversations with homeowners and business owners who have lived with these structures for years.

Her goal is simple: to help homeowners understand the decisions behind a custom timber structure so they can build with confidence, not guesswork.

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