Product Specifications for Each Size: 3' x 8' Pergola Overall: 111"L x 47"W x 100"H Outside Post to Outside Post: 96"L x 34"W Inside Post to Inside Post: 89"L x 27"W 3' x 10' Pergola Overall: 135"L x 47"W x 100"H Outside Post to Outside Post: 120"L x 34"W Inside Post to Inside Post: 113"L x 27"W 3' x 12' Pergola Overall: 159"L x 47"W x 100"H Outside Post to Outside Post: 144"L x 34"W Inside Post to Inside Post: 137"L x 27"W 3' x 14' Pergola Overall: 183"L x 47"W x 100"H Outside Post to Outside Post: 168"L x 34"W Inside Post to Inside Post: 161"L x 27"W 4' x 8' Pergola Overall: 111"L x 59"W x 100"H Outside Post to Outside Post: 96"L x 46"W Inside Post to Inside Post: 89"L x 39"W 4' x 10' Pergola Overall: 135"L x 59"W x 100"H Outside Post to Outside Post: 120"L x 46"W Inside Post to Inside Post: 113"L x 39"W 4' x 12' Pergola Overall: 159"L x 59"W x 100"H Outside Post to Outside Post: 144"L x 46"W Inside Post to Inside Post: 137"L x 39"W 4' x 14' Pergola Overall: 183"L x 59"W x 100"H Outside Post to Outside Post: 168"L x 46"W Inside Post to Inside Post: 161"L x 39"W