The exact cost to install French doors varies by area. For example, in Richmond, Indiana, as of 2015, the average cost per door can be as low as $602 and as high as $1,031. The exact costs depend on project location, project size and materials used.
Homeowners should consult local vendors who are able to quote a more exact cost for a specific project. Factors that can drive the overall cost include relocating or enhancing existing structures as well as having a contractor oversee the project. Additionally, local building codes may require permits or inspection fees, which can further drive costs up.