Rough Order of Magnitude

A Rough Order of Magnitude (ROM) estimate in the construction industry is a preliminary and approximate calculation of a project’s costs. It is typically used in the early stages of project planning when detailed information is not yet available. The ROM gives stakeholders a ballpark figure of the project expenses, often expressed as a range, allowing for initial financial planning and decision-making. This type of estimate helps in assessing project feasibility, setting expectations for potential investment, and guiding the direction for more detailed planning and analysis as the project progresses.