Building Information Modelling (BIM) is increasingly deployed as part of the processes in Architecture, Engineering and Construction (AEC) industry projects. While the benefits of BIM have been extensively proclaimed, explicit justification in terms of direct cost savings for BIM implementation on real-life projects, particularly for clash detection BIM workstream, are not well documented. This paper proposes and demonstrates a methodology to prove how BIM-based clash detection leads to cost savings. A schema is developed based on literature review and industrial expertise to quantify cost savings achieved by the utilisation of BIM-based clash detection and resolution. This paper provides validation of the proposed schema on a major infrastructure project. The developed schema includes the categorisation of identified clashes based on stakeholder involvement and required actions. The validation used the estimated cost of clashes were those not resolved before site operations took place. This schema simplifies both the categorisation and cost estimation of clashes in design. Estimated savings yielded 20% of contract value using the schema, for the multi-million-dollar project case study, thus extending evidence of BIM savings and benefits. The schema improves the existing process and valorises clash detection, thus allowing stakeholders to conduct a cost-benefit analysis. In addition, the categorisation methodology allows prioritising on the most costly clashes, and draw lessons learnt for further projects. This schema opens the path towards a systematic methodology to appraise the benefits of different BIM uses or processes.

Information flows in construction projects are generally focussed on the needs of the design and construction phases. This creates disruption of workflows across the project stages and in particular with the information handover to the operation stage. The adherence to client requirements for the operation phase of buildings becomes very challenging. A structured information delivery enabled by BIM protocols, established at the project's inception phase, can help: 1. prevent information loss during the project development; 2. ensure the coordinated delivery of the clients' requirements as stated at the pre-design stage, and 3. anticipate the impact of client decisions at early project stages on the operational performance of buildings. This research presents a methodology and a decision support system to help obtaining, categorizing and trading off sustainability and facility management values using subjective driven priorities from top-level management. The decision support system will assist, within digitally enabled projects, in translating these priorities into objective parameters and information categories. These can be subsequently included within the project tender and bidders' BIM Execution Plans. The tool will also help to monitor the performance of the project design with the national sustainability and the client targets as the project progresses. The proposed tool is presented within the context of Qatar but it could be applied in other countries.

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