| Item | Standard |
|---|---|
| Mitre joints (stain-grade) | ≤ 0.5 mm gap |
| Mitre joints (paint-grade) | ≤ 1.0 mm (filled) |
| Cope joints | No visible daylight |
| Casing reveal to jamb | 3–5 mm, ± 0.5 mm consistent |
| Scarf joint angle | 30–45°, always over a stud |
| Cabinet face-frame flush | ± 0.5 mm |
| Countertop level (full run) | ± 1.5 mm |
| Element | OBC | HCMI Target |
|---|---|---|
| Riser height | 125–200 mm | 170–178 mm |
| Tread run (going) | Min. 210 mm | 280–305 mm |
| Nosing projection | 25–38 mm | 25 mm uniform |
| Riser uniformity | Max 6 mm | Max 3 mm |
| Min. stair width | 1100 mm | 1200 mm |
| Headroom | Min. 2050 mm | 2100 mm |
| Handrail height | 865–965 mm | 900 mm |
| Guard height | Min. 1070 mm | 1070 mm |
| Baluster spacing | Max 100 mm | 95 mm clear |
| 2R + G formula | 550–700 mm | 610–640 mm |
Stringer min. throat: 90 mm at deepest notch. Landing depth: ≥ stair width.
| Tolerance | Economy | Custom | Premium |
|---|---|---|---|
| Joint tightness | ≤ 0.8 mm | ≤ 0.4 mm | ≤ 0.2 mm |
| Flushness at joints | ≤ 0.8 mm | ≤ 0.4 mm | ≤ 0.2 mm |
| Door/drawer gap | ≤ 2.4 mm | ≤ 1.6 mm | ≤ 0.8 mm |
| Dimension accuracy | ± 3.0 mm | ± 1.5 mm | ± 0.8 mm |
| Warp per 600 mm | ≤ 3.0 mm | ≤ 1.5 mm | ≤ 0.8 mm |
Sanctuary/narthex: Premium. Kitchen/offices: Custom. Storage: Economy.