Decide what you will be using the space for: a cozy spot to sit and talk or a place to feed family and friends. That makes the difference between purchased a loveseat, coffee table and chairs or a dining table and umbrella. A bench might more sense than a lounge chair, depending on how you use this space.

Is your patio or deck fully exposed to the elements? That may determine what kind of furniture you purchase. Teak weathers well without maintenance, but acacia wood has to be oiled regularly. Powder-coating on aluminum furniture should be first-rate. The look of wicker is achieved with weather-resistant resin fibers, but the frame has to be powder-coated.

Area rugs can help define your space. Choose ones made to withstand sun and rain and to resist mildew. They range from simple woven rugs, to florals, braided, and sculpted floor coverings. You can even choose a teak mat.

Outdoor curtains or fabric dividers can define your space, too. And give you added privacy. Canopies, with drapes on the sides for privacy, are an inexpensive source of shade.

Bright colors or earth tones? Your choice of fabrics and colors depends on your landscaping. If it is primarily foliage, you can choose hot colors as a contrast. But if your patio is surrounded by a colorful perennial garden, you might want to choose earth tones or neutrals.

Looking for an inexpensive new look? Switch out the cushions or the pillow and change the umbrella.

Don't buy too much furniture – or too big. Be aware of the scale of your space, and the fact that guests will need to be able to move around.

If you can't move your furniture indoors during the winter – and most people can't – purchase covers.

Your outdoor room should have a focal point, just as an indoor room does. It could be a fountain, a fire pit, a planter or a piece of outdoor art.