Actually we've bought nearly all the supplies needed & have a contract with the builder for labour costs, so we're pretty confident of coming in close to the target. Of course Thai partner has probably made some alterations to the plans that I don't know about which will jack up the price Also we don't have to buy the wood, when father-in-law got the land 30 years ago he immediately planted enough mai-daeng and mai-pradoo to build a house for each of his 7 children. We are only the 2nd to build so there was a good choice of trees to cut and mill. The only wood we have to buy is for the doors and windows which are being made from recycled wood sourced locally. Add to that the house is not very big (12 sao) and we don't have anykitchen, bathroom or electrical fittings (no electricity on our land) and it will be a pretty basic, but hopefully solid, little holiday house.