Building Codes of the area will have an impact on the patio door. Always check with the building department when choosing a door or window.
Activities and lifestyle may be a factor when making a decision on the door. The amount of space inside and outside of the door opening is important, especially if choosing a hinged door instead of a sliding door. If a large opening is desired, a multi-slide or bi-fold option may be appropriate. Water infiltration could be a problem if a spa or pool is located close to the door.
Energy-efficiency of the door can save money in the long run. Since patio doors are mostly glass, consider the type of glass to be used. The R-value reports the energy-efficiency of the glass; the higher the number the more efficient. The U-factor is the energy-efficiency of the whole door, including the frame and the lower the number the more efficient.
If security is a consideration, choose a multi-point locking system to deter intruders.
Privacy may be a concern. Since patio doors contain large glass areas, blinds between the glass, or privacy glass, may be an option.
Sound transference can be decreased by choosing glass options that offer a noise reduction.
The architectural style of the home may have an impact on the patio door style. Depending upon the visual impact of the door on curb appeal, the patio door may demand grills, or wood to maintain the value of the home.