Estimate the key quantities and planning outcome for a window replacement project using inputs you can adjust to match the property and proposed scope. The calculator separates the main result from supporting figures, making it easier to check contractor assumptions, compare options, and identify which input has the greatest effect. Results are planning estimates rather than a substitute for field measurements, product specifications, written bids, or local permit guidance.
Crew days = total labor ÷ (crew size × 8).
The main result summarizes the entered project scope, while the secondary figures expose the components behind it. Treat the estimate as a consistent comparison baseline and investigate any large difference between this result and a contractor proposal.
Actual requirements can change with field measurements, structural conditions, code, product instructions, disposal rules, taxes, labor practices, and the final contract scope.
Twelve windows at 2.5 hours each require 30 base hours. Three difficult windows add 4.5 hours, for 34.5 labor hours or about 2.2 days for a two-person crew.
No. Labor hours add the time of every worker; elapsed time depends on crew size, sequencing, access, and delays.
No separate inspection delay is included. Add schedule time if inspections interrupt the work sequence.
Increase the base labor rate or add a separate allowance after inspecting framing, moisture, and surrounding finishes.
Convert calendar time to total worker-hours first; otherwise crew size will be counted incorrectly.
The same work is distributed among more workers, so estimated elapsed days fall while total worker-hours stay constant.
| Driver | Effect |
|---|---|
| Base hours | Applied to every window |
| Access allowance | Applied only to difficult windows |
| Crew size | Changes elapsed days, not total labor hours |