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.
Define the roof area and included work
Identify the roof section, slope, covering, removal scope, and assembly used to establish the unit amount. Keep areas with different systems separate so the input does not blend unlike work.
Understand the calculation
The tool multiplies your area, unit amount, adjustment, and selected lower/upper factors, rounding the results to whole dollars. The result is a scenario based on your entries, not a roof inspection or contractor quote.
Add the details that area does not capture
- Substrate or deck repairs and their pricing method.
- Edges, flashing, penetrations, drains, gutters, and roof equipment interfaces.
- Access, staging, lifting, disposal, and temporary protection.
- Approval, inspection, warranty, and closeout requirements.