We're looking into building an extension to our small house for five more bedrooms. A friend with a large family have built extension to their house with new timber and materials. It's a lot of work for the entire family. But she recommends buying these old classrooms, Department of Education approved structures, if they had, first, known about them. These classrooms are huge buildings. We can subdivide a classroom into five to six more. Saving money for quality, hardwood timber for walls and flooring would be ideal for my family.