House plans for a nice compact 3 bedroom 2 bathroom bungalow, 10 years ago cost 1,100,000baht to build, reckon now around 1.4 million baht, then add in those farang extras like nice lights, a few electric sockets, kitchen and some aircon, could easily add another million baht to the price.
Here's the cropped version of the floor plan, personally I would do away with the carport unless the land area was really small.
You can download the full architects plans for this house here Thai House Plans 3 bed 2 bathroom.zip
More Thai House Plans here.