{"title":"18x20 Pergolas","description":"\u003cp style=\"margin-top: -45px;\"\u003eWe offer a wide selection of \u003cstrong\u003e18x20 pergola\u003c\/strong\u003e kits, including both \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/type_free-standing\"\u003efree-standing\u003c\/a\u003e and \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/type_attached-to-house\"\u003ehouse-attached\u003c\/a\u003e kits, those with \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/roof-style_shade-canopyies\"\u003eshade canopies\u003c\/a\u003e and those made for a \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/roof-style_wood-slats\"\u003eslatted wood roof\u003c\/a\u003e, and some made for smaller \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/bracket-size_4x4\"\u003e4x4\u003c\/a\u003e wood frames and others for larger \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/bracket-size_6x6\"\u003e6x6s\u003c\/a\u003e. Use the \u003cspan style=\"background: #FFD93A; padding: 2px 4px 2px 4px; border-radius: 4px;\"\u003efiltering options\u003c\/span\u003e below to quickly find the perfect 4-block pergola kit for your outdoor space.\u003cbr\u003e\u003c\/p\u003e\u003cdiv style=\"background: #F6F6F6; border-radius: 4px; padding: 12px; text-align: center; margin: 25px 0px -10px 0px;\"\u003e\n\u003cspan style=\"color: #bf262f;\"\u003e\u003ci class=\"fa-solid fa-magnifying-glass\"\u003e\u003c\/i\u003e  \u003cstrong\u003eSIMILAR SIZES:\u003c\/strong\u003e\u003c\/span\u003e  \u003ca href=\"https:\/\/zenpergolas.com\/collections\/16x20-pergolas\"\u003e16x20 pergolas\u003c\/a\u003e  |  \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x18-pergolas\"\u003e18x18 pergolas\u003c\/a\u003e  |  \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x22-pergolas\"\u003e18x22 pergolas\u003c\/a\u003e  |  \u003ca href=\"https:\/\/zenpergolas.com\/collections\/20x18-pergolas\"\u003e20x18 pergolas\u003c\/a\u003e\n\u003c\/div\u003e\u003c!-- split --\u003e\u003ch3\u003e18x20 Refers to the Combined Inner Dimensions of the \u003cem\u003e4 Roof Openings\u003c\/em\u003e\n\u003c\/h3\u003e\u003cp\u003eWhen we say a pergola's dimensions are 18x20, we are referring to the combined inside dimensions of the 4 roof openings (from inside-edge to inside-edge). All of the kits featured on this page are meant to have 4 roof openings, arranged in a 2x2 grid, which \u003cu\u003ecombine\u003c\/u\u003e to be a \u003cstrong\u003etotal of 18' wide\u003c\/strong\u003e and a \u003cstrong\u003etotal of 20' deep\u003c\/strong\u003e.\u003c\/p\u003e\u003cp\u003eThe overall outside-edge to outside-edge dimensions of the pergola will be:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e19' 2.6\" wide x 21' 2.6\" deep (if you choose a \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/bracket-size_4x4\"\u003ekit for 4x4 posts\u003c\/a\u003e) \u003cstrong\u003eOR\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e19' 10.6\" wide x 21' 10.6\" deep (if you choose a \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/bracket-size_6x6\"\u003ekit for 6x6 posts\u003c\/a\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWith all of this being said, you can easily change the overall size of your pergola by \u003cstrong\u003etrimming the wood posts\u003c\/strong\u003e that you plan to use for the roof beams. For example, if you wanted the true outside-edge to outside-edge dimensions of a free-standing pergola to be exactly 18' x 20', you would need to:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePurchase \u003cu\u003ethree sets\u003c\/u\u003e of two posts totaling 18 feet to be the beams running the 18-foot width, and then cut off a total of 14.6 inches (for 4x4 wood posts) or 22.6 inches (for 6x6 wood posts) \u003cu\u003eper set\u003c\/u\u003e of two posts; and\u003c\/li\u003e\n\u003cli\u003ePurchase \u003cu\u003ethree sets\u003c\/u\u003e of two posts totaling 20 feet to be the beams running the 20-foot depth, and then cut off a total of 14.6 inches (for 4x4 wood posts) or 22.6 inches (for 6x6 wood posts) \u003cu\u003eper set\u003c\/u\u003e of two posts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cu\u003eImportant Note\u003c\/u\u003e: Our shade canopies are specifically designed to fit roof openings that are exactly 8x8, 8x10, 8x12, 10x10, 10x12 and 12x12. If you're purchasing a \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/roof-style_shade-canopyies\"\u003ekit with shade canopies\u003c\/a\u003e, you \u003cstrong\u003ecannot\u003c\/strong\u003e trim down the roof beam posts. Furthermore, all roof posts must be 8-, 10- or 12-foot lengths.\u003c\/p\u003e\u003ch3\u003eReminder: Width \u0026amp; Depth Are \u003cu\u003eNot\u003c\/u\u003e Always Interchangeable\u003c\/h3\u003e\u003cp\u003e18' x 20' pergolas are different from \u003ca href=\"https:\/\/zenpergolas.com\/collections\/20x18-pergolas\"\u003e20' x 18' pergolas\u003c\/a\u003e. The \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/type_attached-to-house\"\u003ewall-mounted pergolas\u003c\/a\u003e on this page will attach to your home on the 18' width side and come 20' out from the house wall. For \u003ca href=\"https:\/\/zenpergolas.com\/collections\/18x20-pergolas\/type_free-standing+roof-style_wood-slats\"\u003efree-standing pergolas with a slatted roof\u003c\/a\u003e, the roof rafters will be mounted to the 20' beams and run the 18-foot width of the pergola (providing more shade when the afternoon\/evening sunlight comes from the \u003cstrong\u003e18-foot width side\u003c\/strong\u003e). If your afternoon\/evening sunlight will come from the 20-foot side, you'll want a \u003ca href=\"https:\/\/zenpergolas.com\/collections\/20x18-pergolas\"\u003e20x18 pergola\u003c\/a\u003e instead.\u003c\/p\u003e","products":[{"product_id":"18x20-pergola-with-roof-free-standing-diy-kit","title":"Free-Standing 18' x 20' Pergola with Roof","description":"\u003c!----\u003e","brand":"Zen Pergolas","offers":[{"title":"No roof (frame only)","offer_id":42226063540404,"sku":"Free18x20Lg","price":1999.0,"currency_code":"USD","in_stock":true},{"title":"Straight inline 2x6 slats [+$720]","offer_id":42807514824884,"sku":"Free18x20Lg-26IBx48","price":2719.0,"currency_code":"USD","in_stock":true},{"title":"2x6 rafters atop beams [+$828]","offer_id":42807514857652,"sku":"Free18x20Lg-26RBx36","price":2827.0,"currency_code":"USD","in_stock":true},{"title":"Inline 6x6 posts [+$504]","offer_id":42807514890420,"sku":"Free18x20Lg-66IBx24","price":2503.0,"currency_code":"USD","in_stock":true},{"title":"Angled 2x6 slats [+$1200]","offer_id":42807514923188,"sku":"Free18x20Lg-26IBx80","price":3199.0,"currency_code":"USD","in_stock":true},{"title":"Shade canopies [+$639]","offer_id":43213873086644,"sku":"Free18x20Lg-4canopies","price":2638.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0613\/1390\/8916\/products\/FreeQuadLg-InlineMed_bdcc39ca-dd28-430a-8ee3-34208c13bd75.png?v=1747273050"},{"product_id":"free-standing-18x20-pergola-kit-with-roof","title":"Freestanding 18x20 Pergola Kit with Roof","description":"\u003c!----\u003e","brand":"Zen Pergolas","offers":[{"title":"No roof (frame only)","offer_id":42226033426612,"sku":"Free18x20Sm","price":999.0,"currency_code":"USD","in_stock":true},{"title":"Straight inline 2x4 slats [+$576]","offer_id":42807493623988,"sku":"Free18x20Sm-24IBx48","price":1575.0,"currency_code":"USD","in_stock":true},{"title":"2x4 rafters atop beams [+$576]","offer_id":42807493656756,"sku":"Free18x20Sm-24RBx36","price":1575.0,"currency_code":"USD","in_stock":true},{"title":"Inline 4x4 posts [+$600]","offer_id":42807493689524,"sku":"Free18x20Sm-44IBx40","price":1599.0,"currency_code":"USD","in_stock":true},{"title":"Angled 2x4 slats [+$1152]","offer_id":42807493722292,"sku":"Free18x20Sm-24IBx96","price":2151.0,"currency_code":"USD","in_stock":true},{"title":"Shade canopies [+$639]","offer_id":43213780844724,"sku":"Free18x20Sm-4canopies","price":1638.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0613\/1390\/8916\/products\/FreeQuadSm-InlineMed_f0b002a6-80f5-420b-8b18-753ac45e2cca.png?v=1747272714"},{"product_id":"18x20-pergola-attached-to-house-with-roof","title":"18' x 20' Pergola Attached to House with Roof","description":"\u003c!----\u003e","brand":"Zen Pergolas","offers":[{"title":"No roof (frame only)","offer_id":42226004951220,"sku":"Att18x20Lg","price":1499.0,"currency_code":"USD","in_stock":true},{"title":"Straight inline 2x6 slats [+$720]","offer_id":42807991009460,"sku":"Att18x20Lg-26IBx48","price":2219.0,"currency_code":"USD","in_stock":true},{"title":"2x6 rafters atop beams [+$828]","offer_id":42807991042228,"sku":"Att18x20Lg-26RBx36","price":2327.0,"currency_code":"USD","in_stock":true},{"title":"Inline 6x6 posts [+$504]","offer_id":42807991074996,"sku":"Att18x20Lg-66IBx24","price":2003.0,"currency_code":"USD","in_stock":true},{"title":"Angled 2x6 slats [+$1200]","offer_id":42807991107764,"sku":"Att18x20Lg-26IBx80","price":2699.0,"currency_code":"USD","in_stock":true},{"title":"Shade canopies [+$639]","offer_id":43214322073780,"sku":"Att18x20Lg-4canopies","price":2138.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0613\/1390\/8916\/products\/AttQuadLg-InlineMed_9bff3fb7-d878-45f2-a751-0fb12884cb75.png?v=1747272384"},{"product_id":"attached-18x20-pergola-with-roof-diy-hardware-kit","title":"Attached 18x20 Pergola Off House with Roof","description":"\u003c!----\u003e","brand":"Zen Pergolas","offers":[{"title":"No roof (frame only)","offer_id":42225971593396,"sku":"Att18x20Sm","price":799.0,"currency_code":"USD","in_stock":true},{"title":"Straight inline 2x4 slats [+$576]","offer_id":42807663952052,"sku":"Att18x20Sm-24IBx48","price":1375.0,"currency_code":"USD","in_stock":true},{"title":"2x4 rafters atop beams [+$576]","offer_id":42807663984820,"sku":"Att18x20Sm-24RBx36","price":1375.0,"currency_code":"USD","in_stock":true},{"title":"Inline 4x4 posts [+$600]","offer_id":42807664017588,"sku":"Att18x20Sm-44IBx40","price":1399.0,"currency_code":"USD","in_stock":true},{"title":"Angled 2x4 slats [+$1152]","offer_id":42807664050356,"sku":"Att18x20Sm-24IBx96","price":1951.0,"currency_code":"USD","in_stock":true},{"title":"Shade canopies [+$639]","offer_id":43214127694004,"sku":"Att18x20Sm-4canopies","price":1438.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0613\/1390\/8916\/products\/AttQuadSm-InlineMed_da6c914b-6db3-477f-8aac-f51eea3753af.png?v=1747272109"},{"product_id":"stand-alone-18x20-pergola-with-canopy","title":"18 x 20 Pergola with Canopies","description":"\u003c!----\u003e","brand":"Zen Pergolas","offers":[{"title":"Two 8x10 \/ two 10x10","offer_id":43149315178676,"sku":"Free18x20Sm-CPY810Bx2-CPY1010Bx2","price":1549.0,"currency_code":"USD","in_stock":true},{"title":"One 8x8 \/ one 8x10 \/ one 8x12 \/ one 10x12","offer_id":43149315211444,"sku":"Free18x20Sm-CPY88B-CPY810B-CPY812B-CPY1012B","price":1549.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0613\/1390\/8916\/files\/FreeQuadSm-CPY1212Bx4-SideView_42a2c4a9-4dc2-4139-a216-ee918dda4b86.jpg?v=1747269723"},{"product_id":"18x20-covered-pergola-with-sun-shade","title":"18x20 Covered Pergola with Sun Shades","description":"\u003c!----\u003e","brand":"Zen Pergolas","offers":[{"title":"Two 8x10 \/ two 10x10","offer_id":43161607798964,"sku":"Free18x20Lg-CPY810Bx2-CPY1010Bx2","price":2639.0,"currency_code":"USD","in_stock":true},{"title":"One 8x8 \/ one 8x10 \/ one 8x12 \/ one 10x12","offer_id":43161607831732,"sku":"Free18x20Lg-CPY88B-CPY810B-CPY812B-CPY1012B","price":2639.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0613\/1390\/8916\/files\/FreeQuadLg-CPY1212Bx4-SideView_7837ae43-d33d-4aee-98eb-80efa99bfe3f.jpg?v=1747269666"},{"product_id":"wall-mounted-18x20-pergola-with-shade-cover","title":"18' x 20' Pergola with Shade Covers","description":"\u003c!----\u003e","brand":"Zen Pergolas","offers":[{"title":"Two 8x10 \/ two 10x10","offer_id":43188884242612,"sku":"Att18x20Sm-CPY810Bx2-CPY1010Bx2","price":1349.0,"currency_code":"USD","in_stock":true},{"title":"One 8x8 \/ one 8x10 \/ one 8x12 \/ one 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