Commercial Construction Assumptions Log
This is a practical guide to building a assumptions log for a commercial construction project — a register of the assumptions the plan depends on, to be validated, adapted to the realities of delivering a commercial building safely, on time and on budget.
What a Assumptions Log is
A assumptions log is a register of the assumptions the plan depends on, to be validated. For the full concept and how it works in general, see Project Assumption. On a commercial construction project it plays the same role, tuned to this kind of work.
Why it matters for a Commercial Construction project
Commercial Construction projects live or die on delivering a commercial building safely, on time and on budget. A well-built assumptions log gives the team a shared, explicit reference for exactly that — reducing ambiguity, aligning stakeholders, and making problems visible early enough to act. Skipping it, or doing it generically, is how commercial construction projects drift into avoidable delay and cost.
What to include
- Assumption
- Impact if wrong
- Owner
- Validation status
Commercial Construction-specific considerations
Tailor the assumptions log to the risks that most often derail commercial construction projects:
- Weather and site delays
- Material cost inflation
- Safety and compliance
Example
On a real commercial construction project, the assumptions log would be shaped by delivering a commercial building safely, on time and on budget. In particular, it should explicitly account for the project’s biggest risks — weather and site delays, material cost inflation, safety and compliance — rather than treating them as afterthoughts.