The costs of such trips vary widely depending on the location. Lodging also varies according to location and length of trip, but expect spartan accommodations. Volunteers can bunk with local families, sleep in tents or stay in hotels or villas. We stayed in an adequate if slightly rundown hotel that had cable TV and hot water most of the time. But we were told it was a vast improvement from recent mission trips to nearby Nicaragua.
Food can require an adjustment, as well, and be a health concern.
We ate meals at a local cafeteria that was moderately priced but still beyond the means of most Hondurans. We also ventured into the town to local restaurants a couple of nights. We drank bottled water all week, although local soft drinks and beer were safe. Health is a concern for many overseas trips and Habitat provides appropriate information. We needed shots for Hepatitis A and tetanus, and took malaria medication.