If arial photos exist of the site, this will work pretty good. Most of the time the hut sites will show as a different color than the surrounding area.
tree / plant growth --- if a area had a building on it at one time --- and oak trees were around the area they will be larger that the oak trees that later grew where the building was --- Ivan
Try using a probe like the outhouse hunters use. The soil that fills in a hut site should be softer than the "parent" dirt. Keep probing until you've located the sides of the depression, then start detecting and screening. Good luck.