ᐅ Building to the Energy Saving Ordinance 2016 or to KfW55 standards

Hello,
I have been following the forum for a few weeks and have an important question before signing the fixed-price contract.

I am building a turnkey city villa (catalog home) with an air-to-water heat pump, living area approximately 118 sqm (1272 sq ft), and the planning contract has already been awarded. The general contractor offers a standard build according to the Energy Saving Ordinance 2016 and charges an additional approximately 13,000.00 Euro for upgrading to KfW55 standards, which includes improved insulation under the slab and ceiling above the upper floor, as well as exchanging Poroton T12 bricks for Poroton T9 bricks.

The subsidy for KfW55 is 18,000.00 Euro, and the subsidy for KfW55 EE is up to 26,250.00 Euro.

If I build to KfW55 standards, I expect additional costs of 13,000.00 Euro for the improved insulation, 2,000.00 Euro for the energy consultant, and 10,000.00 Euro for a decentralized ventilation system. That would use up the subsidy entirely. According to my research, the annual savings in electricity costs for the air-to-water heat pump compared to the Energy Saving Ordinance 2016 are only about 100.00 Euro per year.

Of course, the higher market value potentially achieved when selling the house speaks in favor of KfW55, but I do not plan to sell.

Otherwise, the savings compared to the Energy Saving Ordinance 2016 to KfW55 are only marginal. Additional ventilation also brings maintenance costs. With KfW55, the building envelope is sealed so tightly that fresh air must be supplied again via fans. You pay for the increased insulation and then for the ventilation needed to compensate. Houses built to the Energy Saving Ordinance 2016 are not as airtight and do not require ventilation systems.

I am opening this topic for discussion.

I look forward to hearing the various opinions.

Regards, Raiweired