Here we shall show you how to make a low cost house design in Bangladesh. Designing a low-cost house in Bangladesh requires careful consideration of the local climate, materials, and construction techniques. Here are some general guidelines and tips to keep the costs down while ensuring a comfortable living space:

1. Simple Design: Opt for a simple and compact design with a square or rectangular footprint. Complex designs with multiple angles and corners can increase construction costs.
2. Efficient Space Planning: Plan the layout effectively to maximize the usable space while minimizing wastage. Avoid unnecessary partitions and consider open floor plans to create a sense of spaciousness.
3. Adequate Natural Lighting and Ventilation: Incorporate large windows and skylights to maximize natural light, reducing the need for artificial lighting during the day. Proper ventilation can also help maintain a comfortable indoor environment.
4. Cost-Effective Materials: Select locally available, affordable, and durable materials. Some commonly used materials in Bangladesh include bricks, concrete blocks, corrugated metal sheets, and bamboo.
5. Lightweight Roofing: Consider lightweight roofing materials like corrugated metal sheets or fiber-reinforced plastic (FRP) sheets. They are cost-effective and suitable for the local climate, providing protection against rain and heat.
6. Insulation: Use insulation materials like expanded polystyrene (EPS) foam or fiberglass to reduce heat gain during hot weather. This can help maintain a comfortable indoor temperature and reduce the need for excessive cooling.
7. Water and Energy Efficiency: Incorporate water-saving fixtures, such as low-flow toilets and faucets. Choose energy-efficient appliances and consider using solar panels for electricity generation, which can lower long-term energy costs.
8. Sustainable Design: Implement eco-friendly practices like rainwater harvesting and wastewater recycling to reduce dependency on municipal resources. Utilize natural landscaping and consider planting trees for shade and natural cooling.
9. Pre-fabricated or Modular Construction: Consider using pre-fabricated or modular construction techniques, which can be faster and more cost-effective than traditional construction methods.
10. Local Labor and Expertise: Engage local labor and construction professionals who have experience working with low-cost housing projects. They can provide valuable insights and help optimize the construction process.

Remember that low-cost housing does not mean compromising on safety, durability, or livability. It's important to adhere to building codes and regulations while ensuring the house meets the basic requirements for a comfortable living space. Consulting with an architect or a professional in the field can provide you with customized advice tailored to your specific location and budget.