Yes, we have a minimum footage. You must realize that a normal curbing crew is 3-4 men, with 1 truck and a trailer with all the necessary equipment. We cannot travel across town and do 20 feet, a company would lose money on that. We currently have a 100 foot minimum on New Installs, some other companies are lower but may have a smaller crew etc. Tree rings need to be large enough to handle growth years down the road and they are difficult and time consuming. We have a 20-foot minimum on tree rings which will give you at least a 6 foot diameter circle.