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6. Building a home to Passivhaus standard could cut your energy bills by up to 75%. For either retrofit or new-build homes, Passivhaus is the gold standard for energy efficiency. In technical terms, a home built to Passivhaus standard should have an energy demand of under 15kWh/m2/year. In practical terms, this means that the home shouldn’t need any heating source as the home heats itself through the ‘waste’ heat given off by electrical appliances, hot water tank and the residents themselves.
For contractor-built new homes, construction costs for a Passivhaus-standard home are usually around 15-20% higher than a similar non-passive home. Over the lifetime of a home, the savings on heating bills should more than compensate for this additional upfront investment.