Atiq Ur Rehman, M.; Khan, S. A. and Chaabane, A. (2026) An integrated decision support model for early planning in off-site construction projects. Journal of Construction Engineering and Management, 152(9): 04026142, ISSN 0733-9364
Abstract
The construction industry is evolving toward more standardized, supply chain-oriented, modular, and integrated practices. This research introduces a novel transition matrix-based mixed-integer linear programming (MILP) model that optimizes modular construction (MC) design alongside supply chain decisions. The model incorporates real-world factors, such as modular element selection, supplier identification, and process sequencing and timing. Its unique contribution lies in the simultaneous optimization of both design and supply chain decisions within a unified framework. The model also enables sensitivity analysis on design choices, supplier alternatives, and productivity, supporting robust scenario planning and risk mitigation. Applied to both small and large-scale instances, the model proves computationally efficient and practical for real-world use. Results show that higher upfront investments in MC lead to improved inventory control, lower onsite costs, significantly shorter project durations, up to 44% faster completion, and 86% reduction in onsite work. The model fills existing research gaps by integrating decisions of MC, supply chain, and project management, offering a valuable project planning tool for general contractors. The model enhances early-phase decision making, collaboration, and cost-effectiveness while providing detailed insights into supplier management and the performance impact of modularity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | master planning; modular construction; optimization; strategic planning; supply chain and product design |
| Index terms: | off-site construction, linear programming, inventory, construction industry, integrated practice, project management, risk mitigation, sensitivity analysis, strategic planning, product design, project planning, supplier management, collaboration, cost-effectivenes, onsite, duration, modular construction, general contractor, modularity, scenario planning, decision-making, decision support, productivity |
| Subjects: | environmental hazards, innovation and technology management, financial risk, inventory management, design flexibility, decision analysis, practitioner, building construction, economics, project management theory and practice, algorithms, control systems, project controls, industry analysis, supplier oversight, management |
| Topics: | Project Management, Digital Applications, Research Practice, Time Control, Roles and Professions, Cost Management, Design Practice, Organizational Design, Risk Management, Engineering Principles, Business Strategy, Sustainability, Supply Chain Management, Construction Technology |
| Descriptive scope: | 4 PCTA |
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