Can I add a slightly different perspective...
The assessment of the cost incurred as a result of the delay has little, if anything, to do with what normally happens. It can be quite dangerous to start with an assumption like this rather than saying more openly, what is now needed as a result of this delay; do we need more site supervisory time (a people cost) or more head office time (part of the fee) or in fact neither. There could be stacking of activities caused by the delay or conversely a period during which the site is effectively sterile (for environmental or statutory undertaker reasons), Was the CE from weather (in which case has the CM spent any extra time on site) or from the introduction of wholly new work (in which case an additional supervisory resource may be needed). These are just a few examples to highlight why starting with an assumption and trying to answer this sort of question at high level can be misleading and not the right approach.
The change in Defined Cost will be based on time spent in the working area (as Jon points out) but what that number should be is not so simple as just what has happened before at extend for the delay period.
The assessment of the cost incurred as a result of the delay has little, if anything, to do with what normally happens. It can be quite dangerous to start with an assumption like this rather than saying more openly, what is now needed as a result of this delay; do we need more site supervisory time (a people cost) or more head office time (part of the fee) or in fact neither. There could be stacking of activities caused by the delay or conversely a period during which the site is effectively sterile (for environmental or statutory undertaker reasons), Was the CE from weather (in which case has the CM spent any extra time on site) or from the introduction of wholly new work (in which case an additional supervisory resource may be needed). These are just a few examples to highlight why starting with an assumption and trying to answer this sort of question at high level can be misleading and not the right approach.
The change in Defined Cost will be based on time spent in the working area (as Jon points out) but what that number should be is not so simple as just what has happened before at extend for the delay period.