Pedro Fernández, president of the National Construction Confederation in Spain, explained the challenges of accurately estimating building project costs. He noted that construction of a building typically requires 24 to 36 months, and failing to regularly revise pricing can lead to unforeseen expenses. A key issue is the fluctuating price of materials, specifically citing aluminum as an example of a cost that is difficult to predict over a three-year period. The construction sector is also facing significant problems due to a shortage of available workers. These factors combine to create uncertainty in budgeting and potentially increase the overall cost of construction projects throughout Spain. Fernández emphasized the need for proactive price adjustments to mitigate these risks.