List of attributes and metrics for calculations
| Attribute | Assumed BIM impact | Variables needed to convert impact to cost (case related) | Required metric to calculate direct impact of BIM |
|---|---|---|---|
| D1 | Assumed efficiency saving to internal management costs | Inhouse cost per month Design and construction duration | efficiency savings % |
| C1 | This benefit will reduce associated contractor’s prelim costs | construction value prelims% | Time saving as % of overall project |
| C2 | Assumed reduction of the programme and leading to reduced inflation costs | Project duration in years, Construction value, Annual inflation | efficiency savings % |
| C3 | Assumed efficiency saving to contractors pricing levels | Tender value, user defined % reduction of tender prices | efficiency savings % |
| C4 | Assumed efficiency saving to construction risk provisions | construction value used defined construction risk | efficiency savings % |
| C5 | Assumed reduction in client held risk | construction value user defined client risk reduction | efficiency savings % |
| C6 | Assumed efficiency saving to cost of BWIC | construction value M&E % of the total works, BWIC % | saving to cost of BWIC |
| C7 | Assumed efficiency saving to management of changes during construction | Cost of handling one change | Reduction of changes % |
| O1 | Assumed efficiency saving to transfer data at completion | Hourly rate Hours spent | efficiency savings % |
| O2 | Assumed efficiency saving per annum of enhanced data management | time saving per request hr. Cost rate/hr for labor Nr of requests | efficiency savings % |
| O3 | Assumed efficiency saving per annum to energy costs | Area of building (m2), energy use/m2, user % saving, rate of kWh operational period (yrs) | efficiency savings % |
| O4 | Saving time and resources for each maintenance event during the operational stage | time saved per event (hr) cost rate/hr for labor number of maintenance events (Bosch-Sijtsema et al.) | efficiency savings % |
| O5 | Savings due to combined maintenance tasks | LCC rate/m2, Gross Internal Area user% saving, operational period | efficiency savings % |
| Attribute | Assumed BIM impact | Variables needed to convert impact to cost (case related) | Required metric to calculate direct impact of BIM |
|---|---|---|---|
| D1 | Assumed efficiency saving to internal management costs | Inhouse cost per month | efficiency savings % |
| C1 | This benefit will reduce associated contractor’s prelim costs | construction value | Time saving as % of overall project |
| C2 | Assumed reduction of the programme and leading to reduced inflation costs | Project duration in years, Construction value, Annual inflation | efficiency savings % |
| C3 | Assumed efficiency saving to contractors pricing levels | Tender value, user defined % reduction of tender prices | efficiency savings % |
| C4 | Assumed efficiency saving to construction risk provisions | construction value | efficiency savings % |
| C5 | Assumed reduction in client held risk | construction value | efficiency savings % |
| C6 | Assumed efficiency saving to cost of BWIC | construction value | saving to cost of BWIC |
| C7 | Assumed efficiency saving to management of changes during construction | Cost of handling one change | Reduction of changes % |
| O1 | Assumed efficiency saving to transfer data at completion | Hourly rate | efficiency savings % |
| O2 | Assumed efficiency saving per annum of enhanced data management | time saving per request hr. Cost rate/hr for labor Nr of requests | efficiency savings % |
| O3 | Assumed efficiency saving per annum to energy costs | Area of building (m2), energy use/m2, user % saving, rate of kWh operational period (yrs) | efficiency savings % |
| O4 | Saving time and resources for each maintenance event during the operational stage | time saved per event (hr) | efficiency savings % |
| O5 | Savings due to combined maintenance tasks | LCC rate/m2, Gross Internal Area user% saving, operational period | efficiency savings % |
Source(s): Authors’ own work
Sharing content requires targeting cookies to be enabled. Please update your cookie preferences to use this feature.