The projects only last for 2-4 weeks. This site lists a number of volunteer initiatives. At this site, in addition to general information about France, one can also learn about French food and check out the latest French news. This unique placement will allow you to take part in restoration projects in the beautiful region of Provence. You will live in a small mediterranean village working with nationals of many countries.
Work typically includes stone masonry, stone cutting, tiling, paving, and drystone walling.
On this page, there are all kinds of links to study programs in France. Levels range from high school through University. There are also, in the menu on the left, some links to volunteering and interning in France. At this site, you can explore volunteer placements worldwide. Paris and the rest.