Whether it is a veranda, garden arbor, trellis, lanai or pergola, Extreme Decks can build any hardwood structure for clients' backyards.  Pergolas are a big landscape design element and can be either attached to the house or stand alone. Pergolas. lanais, arbors, all transform gardens and decks into shaded oases. In South Florida's climate, a backyard pergola can really mitigate the heat and especially strong midday light to provide an ideal place to relax around a table, in a chair or sofa.  Furniture is more protected, too.