DPE G and F: What works do you do in priority, and at what cost, to continue to rent?

To continue to rent their accommodation legally since January 1, 2025, the owners of thermal colanders noted G on the DPE must undertake an energy renovation. What work should be done as a priority and at what cost?

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Landlord of accommodation noted G on the diagnosis of energy performance (DPE), Alain has just received the departure notice of his tenant. A bad surprise because the Classified G Can no longer be the subject of a new rental contract since January 1, 2025, on the grounds that these are the worst Thermal TOCKS. Alain therefore has no choice: to continue to rent his property, he must undertake an energy renovation in order to improve the DPE note. And not a notch only but at least two because the goods rated F will be prohibited from rental from January 1, 2028 and The turn of the e will come in 2034.

Moreover, “A jump of at least two classes on the DPE is one of the conditions to be fulfilled to benefit from public aid Maprimerenov ‘ intended for magnitude renovations ”underlines with Capital François Moreaux, head of the Nantes Nord-Est agency at Illico Works, a subsidiary of the promoter Hexaom. Passing “Have many more requests for energy renovation work than four or five years ago”before the promulgation of the climate and resilience law of August 2021, at the origin of the gradual prohibition for the rental of thermal colanders G, F and E.

Priority to insulation and ventilation

What work does it recommend to do priority to bring the DPE of G à E or F to D? “”Insulation work is the most relevant»»indicates François Moreaux. You can choose to isolate the attic and the walls, or the walls and the floor, or, in a house, the partition separating the garage from the living rooms. “Start with the insulation of the attic, the roofadvises the specialist. Because the hot air is rising, it goes through the roof if the property is poorly isolated ”.

Then he recommends modernizing the ventilation system. “Often, thermal colanders F and G have no mechanical ventilation, but natural ventilation. Hence an overview with wind which enters the accommodation in winter ”explains François Moreaux. “”The change of ventilation has a fairly immediate effect on the energy performance label and on comfort ”he assures. You would be all the more wrong to deprive yourself that “The modernization of ventilation is generally one of the cheapest workstations, with a cost of 1,500 to 2,000 euros”adds the expert.

A cost of 1,000 to 1,500 euros per square meter for an apartment

By way of comparison, by changing the windows, “We quickly reach 1,500 euros per opening, on average”he illustrates. However, you will not cut it because it is the third and last gesture of work to be carried out to improve the note of the DPE of two labels, “Thermal colanders often have windows in simple glazing»»explains François Moreaux. What about changing the heating system? “It comes in a second step, to further improve the Note of the DPE, to B, even A. Priority, when you start from so low than G or F, really lies in the insulation of the envelope, of the building , and in the optimization of ventilation ”he insists.

In total, the energy renovation of a thermal coland often accompanied by the repair of the bathroom and the kitchen, as well as the upgrading of electricity, it will cost you “From 50 to 60,000 euros for a 100 square meter houseand from 1,000 to 1,500 euros per square meter for an apartment ”figure François Moreaux.