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The indicator. The certificates describe each home by EP, the annual non-renewable primary energy demand per square meter, calculated by the standard method for the completed building under standard use assumptions: 37.1 kWh/m²·year for the 146 m² homes, 38.2 for the 119 m² homes, 42.3 for the 96 m² homes. Heating and ventilation alone need 17.8 to 22.8 kWh/m²·year. Actual consumption depends on the household.

The cost example, with its scope. The estimate covers heating, ventilation, cooling and hot water; it excludes appliances and lighting. After the roof photovoltaics, a home buys 14.85 to 16.91 kWh per square meter a year from the grid in the certificates' balance. At PLN 0.97 per kWh (G11 tariff, Kraków, 2026 prices) the estimated yearly cost is PLN 1,573 for a 96 m² home, 1,768 for 119 m² and 2,105 for 146 m². A gas-heated home of the same size at the Polish benchmark characteristic would pay an estimated PLN 4,847, 5,982 and 7,281 for the same functions. Over 25 years, with energy prices rising 3% a year, the estimated gap reaches PLN 119,000 to 189,000.

The cooling. A duo-split system with a seasonal efficiency of 6.50 works with the mechanical ventilation; in the certificates' balance electricity for cooling reads 0.00 kWh.

How we know. The homes stand, occupied, with parameters documented independently of us: by a licensed auditor, in the register kept by the ministry, valid to 2035, and with the PLGBC Green Building Awards 2025 distinction. The next phases use the same technology, the same heating system and the same supply chain. Future regulatory requirements must be assessed for each project.

Source: Wola Village phase 1 energy performance certificates, 2025 (CRChE register, calculation method, valid to 2035). Assumptions of the cost example: electricity PLN 0.97/kWh gross, G11 tariff, Kraków, 2026; gas PLN 0.33/kWh gross with distribution; the reference home has the same usable area, EP 161.7 kWh/m²·year per the PKO BP housing-stock analysis, and gas heating. The example covers heating, ventilation, cooling and hot water, without lighting and appliances. Calculated for completed homes under standard use assumptions; actual consumption depends on the household.

The gap between the drawing and the plot. The contractor changes mid-way, insulation goes in during rain, a thermal bridge appears where the drawing had none. The structure of every Wola Village building is made in the MABUDO plant, in controlled conditions, to the dimensional tolerances of industrial production. The certificates issued after completion document the calculated result for each building.

Proof: 103 documents. Phase 1 is 34 buildings and 68 homes, 7,700 m² of usable area. For each, a licensed auditor issued a certificate by the calculation method on the as-built state; all are in the central register, signed electronically and valid to 2035. For the eighteen T1 buildings the differences between homes come down to hundredths of a square meter and their position in the block.

What makes the result. Roof U-value 0.11 W/m²·K where 0.15 is required; floor on ground 0.26 where 0.30 is required; windows and balcony doors 0.80 to 0.90 where 0.90 is allowed. An air-to-water heat pump with a seasonal efficiency of 4.48 feeding underfloor heating and hot water. A duo-split cooling system at 6.50 with mechanical supply-and-extract ventilation; cooling is the largest item of useful demand, about 42%, and it will keep growing with the climate. The buildings were designed to the 2017 technical conditions and, with the PV, meet the stricter 2021 rules with a wide margin; renewable energy is 57 to 60% of final energy by house type, and electricity for hot water and cooling reads 0.00 in the balance. From the grid a home buys 14.85 to 16.91 kWh/m²·year.

The scale of the estate. CO₂: 41.3 t a year against about 227.5 t at the benchmark, calculated from the certificates. The 2025 PLGBC distinction is for sustainable single-family development; the numbers are checkable without it, in the public register.

Why it matters. Phase 1 gave us an as-built reference point instead of a forecast; the next phases are planned in the same technology, with the same heat source and the same prefabrication. Future regulatory requirements must be assessed for each project.

Source: Wola Village phase 1 energy performance certificates, 2025 (calculation method, as-built state, registered in the central register, valid to 2035). Benchmark: average EP of a Polish single-family home 161.7 kWh/m²·year per PKO BP. Calculated for completed homes under standard use assumptions; actual consumption depends on the household.