with American products
w/ American products
All of the pergolas featured on this page have a 10' x 10' pergola roof covered by shade purlins, not including the end caps on traditional-style pergolas (which extend 9 inches beyond the ends of the 10' beams and the 10' rafters, unless you opt for flat end caps). So for all of the 10-foot by 10-foot pergolas on this page, all roof components (including beams, rafters, purlin holders and shade purlins) are 10 feet long, not including end caps.
The posts (i.e. columns) of a traditional 10' x 10' pergola can be placed anywhere from 0" to 36" in from the outside edges of the beams and rafters (not including the 9" 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 8 feet apart both width-wise and 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 10x10 pergolas (which never have overhangs), the posts are always in the corners. So for modern pergolas, the outside edges of the posts will be 10 feet apart width-wise and depth-wise.
To make our pergolas as affordable as possible, we only manufacture the beams, rafters, purlin holders and shade purlins in 2-foot increments. But one or both of the width/depth dimensions of your deck, patio or other outdoor space may be slightly shorter than 10 feet by 10 feet. Using a basic circular saw or miter saw, you can cut any of the pieces down to the exact length required. Thus, the 10x10 pergolas on this page can easily be turned into 9.625-foot by 9.75-foot pergolas (or whatever specific dimensions you need).