Alan, your thoughts please. I want to build a "room" onto wifes parents house. (Yea I know, but just going to use it for few years until I retire and can build a house not so close!) This room will attach to main house with exit front and back. Simple construction, red block and plaster with tile roof is what I prefer. 3x9 meter with toilet, sink and shower, tile floor, aluminum sliding door and windows. Nothing fancy like what you show here, simple room. Can you give me a range of cost for something like that, no commitment, just need to know where to start price wise. I think around 100,000 bth. Am I close?