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.
Drywall sheets are rounded up after dividing adjusted coverage by 32 sq ft.
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.
An 800 sq ft floor with 10% waste requires 880 sq ft of flooring. A 650 sq ft wall area with 12% waste needs 728 sq ft of coverage, or 23 standard 4 × 8 sheets.
The displayed method follows the units shown in the inputs; container limits may be reached by volume before weight.
Yes. Reduce the relevant quantity if intact items will be reused, donated, or separately recycled.
No. Lead paint, asbestos, treated glass, and other regulated materials require separate assessment and handling.
Whole sheets, tubes, and container loads cannot normally be purchased as fractions, so those outputs round up.
Separate rates are preferable because cut patterns, breakage, packaging, and salvage vary by material.
| Material | Measured basis |
|---|---|
| Flooring | Finished attic floor area |
| Drywall | New walls, knee walls and other surfaces entered |
| Sheet conversion | 32 sq ft per 4 × 8 sheet before cuts |