Although arbors and pergolas have many similarities between them, the major difference lies in their heights. While an arbor is only between six and a half feet to nine feet tall, pergolas are usually much higher. Arbor is a comparatively smaller structure, with an arched top. Whereas, pergolas have open tops and can be covered with plants or other materials and is directly perpendicular to the straight line it’s resting on. The sizes of pergolas are diversified, they can be as small as just a walkway, or as big as a cover to any deck or patio area. Both arbors and pergolas add beauty to a home.