How to Measure for a Pergola

We sell attached pergolas and freestanding pergolas. Our pergola sizes are listed as Rafter Length (projection/depth) x Beam Length (width). For example, a 9’x12’ pergola is Rafter Length 9 feet by Beam Length 12 feet. In this example the outside post dimensions for a 9’x12’ freestanding pergola would be 6 feet x 9 feet; the outside post dimensions for a 9’x12’ attached pergola would be 7’6″ x 9 feet. If you need help determining the size pergola you need, complete our Contact Us Form or send us an email at info@pergoladepot.com and we’ll get back to you. For outside post dimensions for other sizes, refer to our Pergola Footprint Diagram.

attached pergola

Measuring for an Attached Pergola:

  • Pull your first measurement from the wall to where you would like the outside edge of your posts to land (Depth A).
  • Pull your second measurement parallel to the house where you would like the outside edge of your posts to land (Width D).
  • There is always a 1’6” overhang past the outside edge of the post for both rafters and beams, so the overall dimension would be (Depth A + 1’6” = Dimension C) X (Width D + 1’6” + 1’6” = Dimension B)

How to measure for an attached pergola kit

A = Outside Post to Post Projection

B = Overall Width

C = Overall Projection

D = Outside Post to Post Width

Example: I pulled a measurement from the house for Depth A of 15’7”, and a Width D of 16’3”.

15’7” + 1’6” = Overall Depth (Rafter Length) 17’1”

16’3” + 1’6” + 1’6” = Overall Width (Beam Length) 19’3”

Overall Pergola Dimensions (CxB)= 17’1”x19’3”

freestanding pergola

Measuring for a Freestanding Pergola:

  • Pull your first measurement from front to back where you would like the outside edge of your posts to land (Depth A).
  • Pull second measurement from side to side of where you would like the outside edge of your posts to land (Width D).
  • There is always a 1’6” overhang past the outside edge of the posts for both rafters and beams, so the overall dimension would be (Depth A + 1’6” + 1’6” = Dimension C) X (Width D + 1’6” +1’6” = Dimension B)

How to measure for a freestanding pergola kit

A = Outside Post to Post Projection

B = Overall Width

C = Overall Projection

D = Outside Post to Post Width

Example: I pulled a measurement from front to back (Depth A) of 15’7”, and from side to side (Width D) of 16’3”.

15’7” + 1’6” + 1’6” = Overall Depth (Rafter Length) 18’7”

16’3” + 1’6” + 1’6” = Overall Width (Beam Length) 19’3”

Overall Pergola Dimensions (CxB)= 18’7”x19’3”