The Humphrey18 by Berstan Homes has an alfresco area of 3.6 x 3m, we separated the area from the side fence with the use of decorative panels.

The panels are readily available at Bunnings or Mitre10 and cost around $100 each they also come in many different designs.
We found the panels were easy to work with and created a degree of privacy and they look great.
Brick walls in alfresco areas can become a little plain so the inclusion of some artwork can become an easy way of creating an interesting talking point.