The document discusses low-cost building techniques. It notes that low-cost building is important to increase affordable housing options and reduce environmental impact. Some key points include: (1) using alternative materials like bamboo can significantly reduce costs while maintaining quality; (2) design should focus on practical spaces and source materials locally to cut transportation costs; (3) estimation software can accurately project costs and help identify areas for cost savings. Overall low-cost building can help address housing needs in a sustainable way.