3,776pieces to order (+10% waste)
€45,312production cost at €12/piece
€75,520sales price at 40% margin
3,432installed on the wall
264m² net façade
24windows
30 × 62 grid of 400 × 200 mm pieces — 1,385 full, 331 cut (hatched), 144 omitted behind windows → 1,716 pieces on this wall.
| Wall | Size | Windows | Net m² | Full | Cut | Pieces |
|---|---|---|---|---|---|---|
| Front | 12 × 12.8 m | 12 | 132 | 1,385 | 331 | 1,716 |
| Back | 12 × 12.8 m | 12 | 132 | 1,385 | 331 | 1,716 |
| Left | party wall — no cladding | |||||
| Right | party wall — no cladding | |||||
| Total | 24 | 264 | 2,770 | 662 | 3,432 | |
Cross-check by area: 264 m² ÷ one 408 × 208 mm module ≈ 3,112 pieces. The grid count above is higher because part-pieces at edges, windows, and course ends each still consume a whole piece.