9x12 Pergolas

9x12 Refers to the Inside Dimensions of the Roof Opening

When we say a pergola's dimensions are 9x12, we are referring to the size of the roof opening (inside-edge to inside-edge). All of the kits featured on this page are meant to have a 9' wide x 12' deep roof opening. The overall outside-edge to outside-edge dimensions of the pergola will be:

• 9' 7.3" wide x 12' 7.3" deep (if you choose a kit for 4x4 posts) OR
• 9' 11.3" wide x 12' 11.3" 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 9' x 12', you would simply need to trim the roof beam posts to make them 7.3 inches (for 4x4 wood posts) or 11.3 inches (for 6x6 wood posts) shorter than a full 9 feet and 12 feet.

Reminder: Width & Depth Are Not Always Interchangeable

9' x 12' pergolas are different from 12' x 9' pergolas. The wall-mounted pergolas on this page will attach to your home on the 9' width side and come 12' out from the house wall. For free-standing pergolas with a slatted roof, the roof rafters will be mounted to the 12' beams and run the 9-foot width of the pergola (providing more shade when the afternoon/evening sunlight comes from the 9-foot width side). If your afternoon/evening sunlight will come from the 12-foot side, you'll want a 12x9 pergola instead.