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.
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 $650 each plus $350 installation, $900 permit/disposal and 10% contingency produce a base cost of $12,900, a $1,290 reserve and a $14,190 budget.
No. It is a planning estimate; use written quotes based on the exact products, site conditions, and scope before committing funds.
Include tax in the entered unit cost or add it to the fixed-cost allowance so it is not omitted.
The entered contingency percentage is applied to the complete base cost, including per-unit and fixed allowances.
Structural repair, custom fabrication, premium finishes, access equipment, and remediation should be added to the most appropriate allowance.
It allocates labor, accessories, fixed costs, and contingency across the project, not just the product purchase price.
| Component | Included amount |
|---|---|
| Units | Window count × unit cost |
| Labor | Window count × installation cost |
| Reserve | Entered percentage of all base costs |