This report presents a comprehensive sustainability assessment of Timberwell Constructions, a fictional construction company. The assessment is structured around the GRI Sustainability Reporting Standards and examines the company's performance across economic, environmental, and social dimensions. Economically, the report analyzes the financial implications of climate change, confirmed incidents of corruption, and legal actions related to anti-competitive behavior. Environmentally, the assessment investigates energy consumption, the impact of operations on biodiversity, and non-compliance with environmental regulations. Socially, the report evaluates workforce diversity, employee turnover, and instances of workplace harassment and discrimination. The report highlights areas where Timberwell Constructions demonstrates strong performance and identifies key areas for improvement, offering recommendations for enhancing its overall sustainability practices. This report serves as a case study, providing insights into how organizations can assess and improve their sustainability performance based on GRI standards.