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24x18 Pergolas

We offer a wide selection of 24x18 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.

  SIMILAR SIZES:  18x24 pergolas  |  22x18 pergolas  |  24x16 pergolas  |  24x20 pergolas

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24x18 Refers to the Combined Inner Dimensions of the 4 Roof Openings

When we say a pergola's dimensions are 24x18, 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 24' wide and a total of 18' deep.

The overall outside-edge to outside-edge dimensions of the pergola will be:

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 24' x 18', you would need to:

  • Purchase three sets of two posts totaling 24 feet to be the beams running the 24-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

24' x 18' pergolas are different from 18' x 24' pergolas. The wall-mounted pergolas on this page will attach to your home on the 24' 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 24-foot width of the pergola (providing more shade when the afternoon/evening sunlight comes from the 24-foot width side). If your afternoon/evening sunlight will come from the 18-foot side, you'll want an 18x24 pergola instead.