The average cost for a 90 square meter hardcore renovation in the United States ranges between $13,500 and $27,000, depending on regional labor rates, material quality, and project complexity. This estimate assumes structural changes, such as foundation upgrades, wall removal, or floor replacements, alongside necessary permits and professional oversight.

The cost variance stems from regional economic disparities and material specifications. For instance, in high-cost areas like California or New York, labor and material expenses can exceed $300 per square meter, whereas regions like Texas or Florida may average $150–$200 per square meter. Data from the National Association of Home Builders (NAHB) indicates that 30% of hardcore renovation projects exceed initial budgets due to unforeseen structural issues or permit delays. Additionally, specialized materials like reinforced concrete ($150–$250 per cubic meter) or steel framing ($80–$120 per square meter) significantly influence total costs. The U.S. Bureau of Labor Statistics reports that carpenters and structural engineers in major cities charge $50–$80 per hour and $100–$150 per hour, respectively, contributing to higher labor costs. Combining these factors, the average cost aligns with the provided range, emphasizing the importance of detailed planning and professional consultation to mitigate budget overruns.