Patio kits can either be free standing or attached by the support of a the house. A free standing pergola has the choice of many shapes; including rectangular, curved or an arc. Rectangular is cheaper, whereas curved ones a little more difficult to construct and therefore costlier. An arc shaped pergola fits nicely on a curved landscape surface. The design and shape of the pergola is manly influenced by the location where it is to be built. If it is near a swimming pool, a free standing pergola can be built in any shape to offer comfort and shade. A pergola near a swimming pool is also beautiful to look at and cool in the summer heat.