Having a test pier installed is not required, but is useful in getting a more accurate cost estimate for your pier install. Typically without a test pier an estimate is given for up to 21ft. and any additional footage is charged by the linear ft., a test pier lets us know what depth your pier will most likely be around and helps us to determine a more accurate cost. If you decide to move forward with piers, the cost of the test pier is credited to overall job.