# Difficulty levels

Difficulty adds between 10% and 40% to window and wash lines, by how hard the access or soiling is.

Rates calibrated October 2, 2026. Review by December 31, 2026. Updated October 2, 2026. Method propdata-estimator-v6.

## Levels

**Difficulty levels**

| Level | Adds |
| --- | --- |
| Standard | 0% |
| Moderate | 10% |
| High | 25% |
| Extreme or first clean | 40% |

Standard is the base level.

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Sources: SkyPSI estimator.

Page: https://skypsi.com/estimates/methodology/difficulty/
JSON: https://skypsi.com/estimates/methodology/difficulty.json
Content license: https://skypsi.com/content-license.txt