Building a cost-effective and economical green building involves incorporating sustainable design principles and utilizing energy-efficient technologies while optimizing construction and operational costs. 
Here are some key strategies to achieve a cost-effective and economical construction of a green building:
Early Design Integration: 
Incorporate sustainable design principles from the early stages of the project. Integrate energy-efficient strategies, passive design techniques, and green building standards into the building's conceptualization and design phase. This allows for better optimization of sustainable features and reduces the need for costly retrofitting later.

Life Cycle Cost Analysis: 
Perform a life cycle cost analysis (LCCA) to evaluate the costs and benefits of various design options and building materials over the building's entire life span. Consider the long-term operational and maintenance costs, energy savings, and potential return on investment associated with green building features. This analysis helps identify cost-effective solutions and justifies investments in sustainable technologies.

Energy Efficiency: 
Focus on energy efficiency measures to reduce operational costs. Implement efficient lighting systems, HVAC systems, and insulation techniques to minimize energy consumption. Use energy modeling tools to assess the building's energy performance and identify cost-effective strategies for optimization.

Renewable Energy Sources:
Integrate renewable energy sources such as solar panels or wind turbines into the building's design. Renewable energy systems can generate on-site electricity, reducing the reliance on grid power and lowering energy costs over time. Consider the feasibility of incorporating energy storage solutions to optimize renewable energy utilization.

Efficient Water Management: 
Implement water-efficient fixtures, such as low-flow toilets and faucets, and utilize rainwater harvesting systems for irrigation and non-potable water use. Efficient water management reduces water consumption and lowers utility costs. Additionally, consider wastewater treatment systems for recycling and reuse of graywater.

Optimize Building Envelope:
 Design and construct an efficient building envelope with high-quality insulation, proper sealing, and energy-efficient windows. A well-insulated building envelope reduces heating and cooling loads, resulting in energy savings and reduced operational costs.

Material Selection:
 Choose sustainable and locally sourced materials that offer good durability, energy efficiency, and reduced environmental impact. Consider materials with low embodied energy and high-recycled content. Conduct a cost-benefit analysis of materials to ensure they align with the project's sustainability goals and budget.

Waste Management: 
Implement a comprehensive waste management plan during construction to minimize waste generation and maximize recycling and reuse. Proper waste segregation and disposal practices can reduce disposal costs and contribute to the project's sustainability objectives.

Green Roof and Landscaping:
 Consider incorporating green roofs or rooftop gardens, which provide insulation, reduce stormwater runoff, and enhance energy efficiency. Use native and drought-resistant plants in landscaping to reduce irrigation needs and maintenance costs.

Commissioning and Monitoring: 
Implement a commissioning process to ensure that all building systems and equipment are installed and calibrated correctly for optimal performance. Regular monitoring and maintenance of the building's energy and water systems help identify and address any inefficiencies or issues promptly, minimizing operational costs.

Incentives and Rebates: 
Research and take advantage of available government incentives, tax credits, and rebates for green building construction. These financial incentives can offset initial costs and make sustainable features more affordable.

Collaboration and Education: 
Foster collaboration among the design team, contractors, and suppliers to ensure a comprehensive understanding of green building practices and goals. Invest in training and education for the construction team to improve their knowledge and skills in sustainable construction practices.

By implementing these strategies, a cost-effective and economical green building can be achieved. It is important to consider the specific context, budget limitations, and local regulations when developing a green building project. 

Engaging with experienced green building consultants and professionals can provide valuable insights and expertise throughout the design and construction process.