walkways retaining walls paving stones WALKWAYS Finding the right contractor to install Unilock walkways, driveways, or patio can be a difficult time consuming task. Unilock makes it just that much easier for you by being able to recommend a quality contractor to you. Through Unilock’s Authorized Contractor Program, you will be able to have a greater peace of mind. These independent contractors have been screened and their workmanship has been monitored and reviewed.