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Thermal renovation: how to calculate the return on investment?

Thermal renovation: how to calculate the return on investment?


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We are nearly 3,400,000 in France to devote more than 10% of our resources to pay our energy bills. Thermal renovation work is emerging as the best way to reduce energy consumption, increase comfort and ultimately reduce the energy bill. Because renovating the home has a cost, it is important to know when and what the return on investment will be. It is according to the needs and sources of energy loss of each dwelling that thermal renovation works are directed towards insulating attics, walls, floors, changing heating systems or windows. Each of these works has a higher or lower cost. To help you achieve them, there are more or less significant financial aid depending on their nature (and if the energy reduction exceeds 25%, we can also count on aid to the national program "Living Better"). The reduction in energy generated will also be more or less substantial. The number of years necessary for the energy savings generated to offset the initial cost of the work therefore varies according to all these parameters. To give you an idea, here is the decryption of the return on investment of the works that lead to the most energy savings.

Roof insulation: return on investment

Insulation works in the attic (uninhabitable or habitable) range from 2,500 to 5,000 euros for a thermal improvement which will make it possible to save 27% on the energy bill. The return on investment without subsidies varies between 6 years for electricity and 12 years for gas. Note: as the reduction in consumption exceeds 25%, there are more financial aid. The return on investment time can therefore be halved when the work has benefited from subsidies.

Exterior wall insulation: return on investment

Since thermal insulation from the outside costs between 8,000 and 16,000 €, it has the advantage of avoiding thermal bridges formed at the junction of rooms when the walls are insulated from the inside. In addition, this insulation results in a 25% reduction in conventional consumption, and the payback time taking into account subsidies amounts to between 12 and 16 years for electricity and gas. Without aid, the number of years necessary for the energy savings generated to offset the initial cost of the work varies between 18 and 24 years.

Change of heating systems: return on investment

From 3000 and 7000 euros, it is the cost generated by the change of heating systems which will lead to an energy saving of 25%. Regarding the duration of the return on investment, it takes between 6 and 9 years for fuel oil and gas, and between 4 and 5 years when the subsidies have made it possible to finance part of the work. Changing the condensing boiler costs slightly more, from 4,000 to 8,000 €, for 28% savings; the return on investment for subsidized work will take 4 or 5 years.