Estimate the key quantities and planning outcome for a attic conversion 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 hours ÷ (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.
For 800 sq ft at 0.12 hour per sq ft with 2 detailed openings, labor is 800 × 0.12 + 2 × 6 = 108 hours. A three-person crew needs 4.5 eight-hour days.
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.
| Input | Role |
|---|---|
| Base rate | Framing, insulation, drywall and finish work per square foot |
| Opening allowance | 6 hours per dormer or skylight for planning purposes |
| Crew size | Converts labor hours into elapsed crew days |