THE TOOLKIT / 04
Whole-house project estimator
Plan materials across multiple rooms in your home. Calculate an aggregated Bill of Materials (BOM) for paint (primer + coats), flooring with waste buffer, and wallpaper with pattern repeats, complete with whole-project budget and printable contractor spec sheet.
Multi-Room BOM · Live URL State Sharing · Printable Spec Sheet—
Primer + finish coats
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Includes 10% cutting waste buffer
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Pattern repeat loss included
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All materials combined
Uses your entered prices. Excludes tax, labor & delivery.
Configure each room’s tasks & dimensions
Whole-House Bill of Materials & Room Schedule
| Category | Specification | Net Required | Recommended Purchase | Unit Price | Subtotal |
|---|---|---|---|---|---|
| Estimated Total Materials Cost | — | ||||
| Room | Dimensions (L × W × H) | Deductions | Net Wall | Paint | Floor Area (+Waste) | Flooring | Wallpaper | Est. Cost |
|---|
Hardware Store & Contractor Preparation Checklist
- ☐ Primer (surface-compatible formula)
- ☐ Wall paint (tint codes & sheens verified)
- ☐ Painter’s tape (multi-surface or delicate)
- ☐ Roller frames, covers (3/8" or 1/2" nap), & pole
- ☐ 2" or 2.5" angled sash brushes for cutting-in
- ☐ Paint trays, disposable liners, & stir sticks
- ☐ Drop cloths & spackle / patching compound
- ☐ Flooring boxes (verified matching dye/production lot)
- ☐ Underlayment / moisture vapor barrier
- ☐ Doorway transition T-moldings / reducers
- ☐ Perimeter expansion spacers (1/4" or 3/8")
- ☐ Tapping block, pull bar, & rubber mallet
- ☐ Baseboards or quarter-round shoe molding
- ☐ Wallpaper rolls (verified identical run / batch)
- ☐ Adhesive / paste & application roller/brush
- ☐ Smoothing blade & seam roller
- ☐ Precision snap-off utility knife & spare blades
- ☐ Plumb line or laser level for vertical drops
- ☐ Clean sponge & bucket for adhesive wipe-down
Aggregates material requirements across all configured rooms. Paint estimates assume standard wall coverage for primer and topcoats after door and window deductions. Flooring includes cutting waste buffer. Wallpaper estimates count full drops with pattern repeat loss. Always verify product-specific instructions before ordering.
THE MATH, WITHOUT THE MYSTERY
How this whole-house estimate works
BOM combines net wall area (4 walls minus openings), paint volume (primer + coats), flooring area with waste buffer rounded to whole boxes, and full wallpaper strips with pattern repeats across all rooms.
A worked example
A project with Living Room (16 × 13 ft), Bedroom (14 × 12 ft), Kitchen (12 × 10 ft), and Hallway (14 × 4 ft) totals ~1,424 ft² net wall area (9 cans of primer & finish paint), ~580 ft² flooring (~29 boxes with 10% waste), and wallpaper rolls for bedroom feature wall.
Read the complete calculation noteA FEW USEFUL ANSWERS
Before you head to the hardware store
Can I add or remove rooms?
Yes. Click "+ Add Room" to include more spaces like a guest room or home office, or remove any room not in your renovation scope.
How does the URL sharing work?
Every room change and measurement automatically syncs to the address bar hash. Click "Copy share link" to send your complete project plan to a partner, contractor, or open it on your phone at the store.
Can I print this for the hardware store?
Yes. Click "Print shopping spec sheet" or use your browser print dialog. The page automatically formats into a clean tabular shopping spec sheet with a contractor checklist and zero screen clutter.