About
Guillem Mas is a director at Accuracy specialising in construction delay, disruption and quantum matters. He acts as an expert witness and advises contractors, owners and developers during negotiations, pre-dispute proceedings and formal dispute resolution.
He regularly performs delay and disruption analyses and assesses quantum claims arising from complex construction and engineering projects across the energy, infrastructure, industrial and transportation sectors.
Before joining Accuracy, Guillem gained experience in financial valuation, working in particular on transactions and providing advisory services within the maritime sector, contributing to strategic plans, market studies and business plans.
His work has involved major international projects worldwide. He speaks Spanish, Catalan, English and French.
Qualifications
- MSc in Management, HEC Paris, France.
- MSc in Civil Engineering, BarcelonaTech, Universitat Politecnica de Catalunya, Spain.
- BSc in Civil Engineering, BarcelonaTech, Universitat Politecnica de Catalunya, Spain.
In-depth expertise
Guillem specialises in delay, disruption and quantum analysis in complex construction and engineering disputes. His work includes identifying critical paths, assessing the causes and effects of delay, and analysing disruption to project execution. He also assesses claims for prolongation costs, variations, loss of productivity, financing costs, interest and other heads of claim.
Guillem has been appointed as an independent expert on several major projects and has provided testimony before dispute boards and international arbitral tribunals. He delivers expert opinions in English and Spanish and is particularly skilled at assimilating extensive project records, identifying the principal issues of the dispute, and presenting clear and focused conclusions.
Example of engagements
Delay analysis
- Independent delay analysis in the context of a dispute between JV members of an EPC contract in the construction of a $3bn metro line in the Middle East.
- Independent delay analysis on a dispute on behalf of the EPC contractor against the owner in the construction of a $500m cable-stayed bridge in Central America.
- Independent delay and disruption analysis on behalf of the main contractor in a dispute against its EPC contract JV partner in the construction of an $800m combined-cycle power plant in South America.
- Independent delay analysis on behalf of the EPC contractor in a pre-dispute against the owner related to the construction of a $4bn oil refinery in Southeast Asia.
- Independent delay analysis in a dispute between the owner and the subsea pipeline contractor in the construction of a $2.5bn liquified natural gas offshore facility in Africa.
Quantum
- Appointed quantum expert in a termination case between the EPC contractor and the foundations subcontractor in the construction of a $600m combined-cycle power plant in Europe.
- Appointed quantum expert in the assessment of prolongation costs and interest on late payments in a dispute between the EPC contractor and the employer in the construction of a $300m HVDC bipolar converter station in Asia.
- Appointed quantum expert acting on behalf of the EPC contractor in the review of the quantum claims submitted by the subcontractors related to the construction of two data centres ($1.2bn) in the Middle East.
- Appointed quantum expert in the pre-dispute between the baggage handling system subcontractor and the main contractor in the construction of an international airport in the Middle East.
- Appointed quantum expert in the pre-dispute between the baggage screening system and passenger baggage screening system subcontractor and the main contractor in the construction of an international airport in the Middle East.