It will vary by type of fence you will order, but the cost of a fence will usually be dependent on a combination of time and materials, and this can vary significantly from one contractor to another. An experienced contractor should be able to explain exactly what goes into a fence if you have questions why one wood fence costs more than another. The least expensive fence is usually cheap for a reason. Inferior materials and a shoddy installation process may lower the cost of a fence, but will always result in an inferior fence that will need to be replaced in five years or less.