Standard: Warunki Techniczne 2021, binding in Poland since January 1, 2021.
Required U-values
- External wall: ≤ 0.20 W/m²K
- Roof: ≤ 0.15 W/m²K
- Ground floor: ≤ 0.30 W/m²K
Climate
Heating Degree Days (HDD): 3,800 (Poland average).
Typical energy price (for savings estimation)
Natural gas: ~0.30 PLN/kWh (2025–2026).
Electric heating: ~0.85 PLN/kWh.
These values are used as defaults in the insulation calculator — you can override the energy price field.