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12x20 Pergola Kits

Maintenance-Free Vinyl and Aluminum 12' x 20' Pergolas Made to Last a Lifetime

The 12x20 pergolas on this page are 12 feet wide and 20 feet deep. The width and depth are not interchangeable. Attached pergolas are mounted to the house on the 12-foot width side and come 20 feet out from the house. For free-standing pergolas, the angled shade purlins run the 12-foot width of the pergola (as shown in this illustration) and therefore provide the most shade when the evening sunlight comes from the 12-foot width side. Click here to see our pergolas with the dimensions reversed.

  • Attached 12' x 20' DIY Aluminum Pergola w/ Maintenance-Free Vinyl Exterior - Made in USA

    Original price $11,659
    Original price Starting at $11,659
    Original price $11,659
    Current price $10,659
    Original price $1,000 Off
    Starting at $11,659 $10,659
    Current price $10,659
    Original price $1,000 Off
    $1,000 Off

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  • High-End 12x20 Attached Pergola w/ Roof - Tan Vinyl w/ Aluminum Frame - Made in USA

    Original price $12,335
    Original price Starting at $12,335
    Original price $12,335
    Current price $11,335
    Original price $1,000 Off
    Starting at $12,335 $11,335
    Current price $11,335
    Original price $1,000 Off
    $1,000 Off

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  • Free-Standing 12' x 20' Patio Pergola With Roof - White Vinyl w/ Aluminum Frame - Made in USA

    Original price $14,394
    Original price Starting at $14,394
    Original price $14,394
    Current price $13,394
    Original price $1,000 Off
    Starting at $14,394 $13,394
    Current price $13,394
    Original price $1,000 Off
    $1,000 Off

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  • 12' x 20' White Modern Pergola Attached to House - Vinyl w/ Aluminum Frame - Made in USA

    Original price $14,621
    Original price Starting at $14,621
    Original price $14,621
    Current price $13,621
    Original price $1,000 Off
    Starting at $14,621 $13,621
    Current price $13,621
    Original price $1,000 Off
    $1,000 Off

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  • 12x20 Modern-Style Pergola - Tan Vinyl w/ Heavy-Duty Aluminum Frame - Made in USA

    Original price $15,086
    Original price Starting at $15,086
    Original price $15,086
    Current price $14,086
    Original price $1,000 Off
    Starting at $15,086 $14,086
    Current price $14,086
    Original price $1,000 Off
    $1,000 Off

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  • Free-Standing 12x20 Custom Patio Pergola - Tan Vinyl w/ Aluminum Frame - Made in USA

    Original price $15,133
    Original price Starting at $15,133
    Original price $15,133
    Current price $14,133
    Original price $1,000 Off
    Starting at $15,133 $14,133
    Current price $14,133
    Original price $1,000 Off
    $1,000 Off

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  • 12x20 Modern Commercial Aluminum Pergola w/ White Vinyl Exterior - Made in USA

    Original price $17,081
    Original price Starting at $17,081
    Original price $17,081
    Current price $16,081
    Original price $1,000 Off
    Starting at $17,081 $16,081
    Current price $16,081
    Original price $1,000 Off
    $1,000 Off

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  • Kit for Building a 12' x 20' Pergola Behind Pool / Over Patio - Tan Vinyl w/ Aluminum Frame - Made in USA

    Original price $17,645
    Original price Starting at $17,645
    Original price $17,645
    Current price $16,645
    Original price $1,000 Off
    Starting at $17,645 $16,645
    Current price $16,645
    Original price $1,000 Off
    $1,000 Off

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12x20 pergolas have a 12x20 roof - posts are typically further in12x20 Refers to the Size of the Pergola's Roof

All of the pergolas featured on this page have a 12' x 20' pergola roof covered by shade purlins, not including the end caps on traditional-style pergolas (which extend 12 inches beyond  the ends of the 12' beams and the 20' rafters, unless you opt for flat end caps). So for all of the 12-foot by 20-foot pergolas on this page, the beams and shade purlins are all 12 feet long (as they run the 12-foot width of the pergola), and the rafters are 20' long (as they run the 20-foot depth of the pergola), not including end caps.

Post Placement for 12x20 Pergolas

The posts (i.e. columns) of a traditional 12' x 20' pergola can be placed anywhere from 0" to 36" in from the outside edges of the beams and rafters (not including the 12" end caps), as shown in this diagram. Most customers choose to place the posts 12 inches in from the ends of the beams/rafters as shown in this CAD drawing, which puts the outside edges of the posts 10 feet apart width-wise and 18 feet apart depth-wise. But again, you can position the posts anywhere from 0 to 36 inches in from the ends of the beams/rafters to create your desired overhangs. It's also worth noting that the overhang can be different on one side than it is on the other sides, if needed or desired.

For modern-style 12x20 pergolas (which never have overhangs), the posts are always in the corners. So for modern pergolas, the outside edges of the posts will be 12 feet apart width-wise and 20 feet apart depth-wise.

All Parts Can Be Trimmed Down to Your Desired Length

To make our pergolas as affordable as possible, we only manufacture the beams, rafters, purlin holders and shade purlins in 2-foot increments (or 4-foot increments above 20 feet). But one or both of the width/depth dimensions of your deck, patio or other outdoor space may be slightly shorter than 12 feet by 20 feet. Using a basic circular saw or miter saw, you can cut any of the pieces down to the exact length required. Thus, the 12x20 pergolas on this page can easily be turned into 11.625-foot by 19.75-foot pergolas (or whatever specific dimensions you need).

Reminder: Width & Depth Are Not Interchangeable

Please be careful when ordering your pergola. A 12x20 pergola is not the same as a 20x12 pergola.

The attached 12x20 pergolas on this page will attach to your home on the 12' side and come 20' out from the wall. For free-standing 12 x 20 pergolas, the shade purlins (which create shade underneath the pergola) must run the 12-foot width of the pergola. So to maximize the pergola's shade, you will want to orient the pergola such that the evening sunlight comes from the 12-foot width side. If your evening sunlight will come from the 20-foot side, you'll want one of these 20x12 pergolas instead.