First Cost vs. Lifecycle Cost
The distinction between a building component's upfront purchase and installation price, its first cost, and the total it actually costs to own over the building's life once energy use, maintenance, and replacement are factored in.
Why it matters
A decision that looks like savings when judged only on first cost can be more expensive overall once lifecycle cost is considered, and the reverse is also true: paying more upfront sometimes saves far more later. Which number a decision gets judged against changes the right answer, which is exactly why this distinction matters during value engineering.
On a real project
A value engineering study compares two HVAC systems: one costs less to install but uses more energy and needs replacement sooner, while the other costs more upfront but saves enough on energy and maintenance over fifteen years to come out ahead on a lifecycle basis, even though its first cost is higher.
Who this matters most to
A Value Engineering Consultant specifically evaluates proposed changes against both numbers, since a change that looks like pure savings on first cost can quietly cost the owner more over time.
Where this goes wrong
A project under budget pressure swaps a specified building system for a cheaper alternative based only on its lower first cost, without running a lifecycle comparison. The owner ends up replacing the cheaper system years sooner than planned, spending more in total than if the original specification had been kept.