Whole-life cost is the total cost of acquiring, operating, maintaining and disposing of an asset, service or solution over the relevant evaluation period.
Detailed explanation
It can include purchase price, installation, energy, consumables, maintenance, downtime, training, replacement, residual value and disposal. The exact components and methodology must follow the procurement documents.
Whole-life costing helps buyers compare solutions whose upfront prices differ but whose long-term operating consequences are significant. For example, a more efficient heating system may cost more initially while reducing energy, reactive maintenance and replacement expenditure.
Supplier calculations must be transparent. State the time horizon, usage assumptions, inflation treatment, discounting where required, maintenance intervals, data sources and exclusions. Unsupported future savings can damage credibility.
Why it matters
It can provide a more meaningful value comparison than upfront price alone.
How buyers use it
The buyer may use whole-life cost to compare the economic effect of solutions over time and align evaluation with long-term value rather than acquisition price alone.
What suppliers should do
- Follow the prescribed model and evaluation period.
- Document every material assumption and data source.
- Reconcile lifecycle claims with technical evidence.
- Test sensitivity to usage, inflation and failure rates.
- Avoid double counting savings or residual value.
Where it fits in the process
- 1Cost categories defined
- 2Supplier inputs evidence and assumptions
- 3Lifecycle costs calculated
- 4Solutions compared consistently
- 5Performance monitored against business case
Frequently asked questions
Is whole-life cost the same as total contract price?
Not necessarily. It may include buyer costs and impacts beyond the supplier’s invoiced price.
Can carbon or energy be included?
Yes where the methodology allows and the calculation is transparent.
What period should be used?
Use the period specified by the buyer or otherwise clearly justify the relevant asset or service life.
Should inflation be included?
Follow the stated methodology and explain the treatment consistently.
What evidence supports maintenance savings?
Service records, warranty data, manufacturer information, performance history and credible case studies.
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