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Concretely, it is necessary to submit PENB for buildings built after year 1947, which have not undergone any major reconstruction since the construction.
Major reconstruction: Improved building envelope (= roof insulation, facade, flooring, window and door replacement) is considered to be greater than 25% greater renovation.
At houses built and not renovated until 1947, the worst energy class is expected. In this case, the real estate agency will be obliged to include energy class G in the advertisements.
For houses built or renovated after 1947, a PENB will still be required to sell or lease.