Calculate from your own assumptions
Adjusted amount = area × your unit amount × your adjustment factor. Lower and upper scenarios multiply that amount by your factors and round to whole dollars. Add costs excluded from your unit amount. Results are arithmetic scenarios, not a quote or forecast.
Set a consistent basis
Use the area affected by the renovation and a unit amount from your own estimate or proposal. Identify what that amount includes before applying it across the whole space. Price site work, owner equipment, professional fees, and other excluded costs separately.
Understand the calculation
The lower and upper amounts multiply area by your unit amount, adjustment, and selected factors, then round to whole dollars. These factors are scenario choices, not market ranges or a probability of the final cost.
Review the result against the scope
- Check retained versus replaced building systems.
- Add occupied-work phases, access, and shutdown requirements.
- List incomplete selections and unverified conditions.
- Keep owner purchases and costs outside the unit amount visible.