The construction industry, accounting for more than one-third of global carbon emissions, is under pressure to reduce its environmental impact. While governments are implementing sustainability-related policies and incentives, private sector involvement is vital for widespread adoption of sustainable technologies. Cleantech startups are at the forefront of innovation, offering solutions such as carbon capture, waste-to-energy processes, and renewable energy sources tailored for construction needs. These startups require significant funding for research and development, making venture capital support essential. Governments, recognizing the importance of sustainability, are providing tax credits and investments to promote technologies like carbon capture. Initiatives like the U.S. Inflation Reduction Act and commitments from global leaders show a shift towards renewable energy and carbon reduction in the construction sector. Private funding plays a critical role in the growth of sustainable startups. For instance, HiiROC in the U.K. is developing zero-emission hydrogen production methods to reduce fossil fuel dependence in construction. With support from Cemex Ventures, HiiROC aims to integrate hydrogen into production processes. Similarly, WtEnergy in Spain transforms waste into clean energy for industrial processes, backed by venture capital and grants. Overall, the synergy between cleantech startups, private funding, and government initiatives is driving the construction industry towards a more sustainable future.