Consequential means the same as consequent. The actual estimate for extra staff and consequential costs such as accommodation was an annual £9.18m. = consequent
having important issues or results; "the year's only really consequential legislation"; "an eventful decision
Something that is consequential is important or significant. From a medical standpoint a week is usually not a consequential delay. = significant inconsequential
having important issues or results; "the year's only really consequential legislation"; "an eventful decision"