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from Boise, ID
from Boise, ID
16x18 Pergolas
We offer a wide selection of 16x18 pergola kits, including both free-standing and house-attached kits, those with shade canopies and those made for a slatted wood roof, and some made for smaller 4x4 wood frames and others for larger 6x6s. Use the filtering options below to quickly find the perfect 4-block pergola kit for your outdoor space.
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Wall-Mounted 16' x 18' Pergola with Shade Covers - Kit for 4x4 Wood
20% OffOriginal price $1,569Original price Starting at $1,569Original price $1,569Current price $1,249Original price $1,569Starting at$1,569$1,249Current price $1,249Original price $1,569 -
Stand-Alone 16 x 18 Pergola with Canopies - Kit for 4x4 Wood
20% OffOriginal price $1,829Original price Starting at $1,829Original price $1,829Current price $1,459Original price $1,829Starting at$1,829$1,459Current price $1,459Original price $1,829 -
Attached 16 by 18 Pergola and Canopies - Kit for 6x6 Wood
20% OffOriginal price $2,449Original price Starting at $2,449Original price $2,449Current price $1,949Original price $2,449Starting at$2,449$1,949Current price $1,949Original price $2,449 -
16x18 Covered Pergola with Sun Shades - Kit for 6x6 Wood
20% OffOriginal price $3,179Original price Starting at $3,179Original price $3,179Current price $2,539Original price $3,179Starting at$3,179$2,539Current price $2,539Original price $3,179
16x18 Refers to the Combined Inner Dimensions of the 4 Roof Openings
When we say a pergola's dimensions are 16x18, 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 combine to be a total of 16' wide and a total of 18' deep.
The overall outside-edge to outside-edge dimensions of the pergola will be:
- 17' 2.6" wide x 19' 2.6" deep (if you choose a kit for 4x4 posts) OR
- 17' 10.6" wide x 19' 10.6" deep (if you choose a kit for 6x6 posts)
With all of this being said, you can easily change the overall size of your pergola by trimming the wood posts 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 16' x 18', you would need to:
- Purchase three sets of two posts totaling 16 feet to be the beams running the 16-foot width, and then cut off a total of 14.6 inches (for 4x4 wood posts) or 22.6 inches (for 6x6 wood posts) per set of two posts; and
- Purchase three sets of two posts totaling 18 feet to be the beams running the 18-foot depth, and then cut off a total of 14.6 inches (for 4x4 wood posts) or 22.6 inches (for 6x6 wood posts) per set of two posts
Important Note: 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 kit with shade canopies, you cannot trim down the roof beam posts. Furthermore, all roof posts must be 8-, 10- or 12-foot lengths.
Reminder: Width & Depth Are Not Always Interchangeable
16' x 18' pergolas are different from 18' x 16' pergolas. The wall-mounted pergolas on this page will attach to your home on the 16' width side and come 18' out from the house wall. For free-standing pergolas with a slatted roof, the roof rafters will be mounted to the 18' beams and run the 16-foot width of the pergola (providing more shade when the afternoon/evening sunlight comes from the 16-foot width side). If your afternoon/evening sunlight will come from the 18-foot side, you'll want an 18x16 pergola instead.