Existing buildings · Defined
Remaining useful life (RUL)
An estimate of how long an existing component may continue to perform before major repair or replacement. It considers observed condition and relevant operating history, not age alone.
Why it matters
RUL is a planning estimate, not a warranty. Maintenance, exposure, installation quality, usage, and available records can change the assessment. Where access or records are limited, the report should state the uncertainty instead of implying a precise prediction.
In practice
A project example
Two boilers installed in the same year can have different replacement outlooks if one has been well maintained and the other has recurring failures.
General educational guidance from KOW Building Consultants. Examples are illustrative, not project records. The applicable contract, standard, program, and jurisdiction control the requirements for a specific assignment.