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This research evaluated the performance and accountability of consulting engineers in optimizing cost and time management in intra-urban bridge construction projects in Mazandaran province. Classified as applied research with a descriptive survey methodology, the study focused on experts in construction projects due to their specialized knowledge. Key factors influencing project performance included material and labor procurement, on-site resource availability, workforce skill and productivity, stakeholder financial status, consultant and subcontractor expertise, economic and environmental conditions, contractor technology, site and design quality, management practices, and decision-making efficiency. The analysis revealed that factors such as resource availability, workforce productivity, subcontractor expertise, site conditions, and contractor management positively impacted cost and time efficiency. In contrast, delays in decision-making, rework, poor coordination, and environmental challenges were identified as constraints. The findings highlight the importance of addressing these factors to improve project outcomes.
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