Hi Steve and Sharon,
A couple from my church helps build or expand churches each year. I know they refer to themselves as BFCers so I am thinking it's Builders For Christ. Not sure if this is the right site but here's
BFC.org. While not listed on this site, which leads me to believe it's a different group, my friends just got word that they are helping to build the new Ebenezer Baptist Church in Dunlap, TN (~ 1 hour from Chattanooga). I understand that to get in on some of these trips, it's pretty competitive. You have to respond and signup early.
I have also heard of
Campers for Christ.
We have one member on this forum (and his wife) that volunteer at some Christian camp over the winter. I have no details but I'll let him find this post and reply to it.
I'd love to be on the framing and drywall team for that build in TN but it's during the same week as our Branson rally
Jim