How to renovate your "thermal strainer"?

• A "thermal sieve" is a dwelling whose energy performance diagnosis (DPE) is classified F or G, i.e. a particularly poorly insulated dwelling.

• If you want to renovate it, you must first target the work that needs to be done through an energy audit.

• The national housing agency (Anah) points out that you should only call on RGE-approved craftsmen, the only ones allowing you to receive the various existing aids to finance your project.

Energy consumption is in (almost) every conversation.

And this notably involves domestic consumption, which represented, in 2020, 49% of the total, according to data from the Ministry of Ecological Transition.

For some homes, it is possible that it is excessively high, due to overconsumption due to poorly insulated housing.

How are these heat losses distributed?

Teksial, which offers tailor-made solutions for energy, communicated to

the following figures: 25% to 35% of the heat in a home escapes through the roof, 20 to 25% through the air renewed, 15 to 20% by the walls, 10 to 15% by the windows, 5 to 10% by thermal bridges - any defect in the insulation which leads to heat loss and reduces the thermal resistance of your home, according to TotalEnergies - as well as 10 to 15% by the floors.

And to assess all this, there is the famous energy performance diagnosis (DPE).

The latter provides information on the energy performance of a dwelling or a building via a rating ranging from A to G. And when the label indicates F or G, the dwelling is considered to be a “thermal sieve”.

According to the National Observatory for Energy Renovation, there are 5.2 million in France.

But the days of their rental are numbered by 2034, knowing that the government has put in place the freezing of their rents since August 24.

Whether you decide to get into rental investment by buying a "strainer", or whether you want to reduce bills by renovating your home,

tells you what to do.

Better manage the stage of work

So how do you get started?

If Alain Brossais, director of strategies and territorial relations at Anah, considers that it is "possible to renovate your house yourself to reach at least the letter D", he recognizes that it remains "complex from a technical point of view”.

"You shouldn't start on your own," warns Jean-Dominique Masseron, regulatory and public affairs director at Teksial.

To start, you have to file a file with a “company acting for the National Housing Agency (Anah)”, specifies the latter, “since they are the only ones able to do so”.

You must then have an energy audit of your home carried out, which "must make it possible, from a detailed analysis of the building's data, to establish a costed and argued proposal for energy saving programs", according to the environment and energy management agency (Ademe).

Its price is between 500 and 1,000 euros, and only an RGE approved professional is able to carry it out.

The latter can also carry out your work afterwards, for a total of between 15,000 and 60,000 euros approximately.

And you will only be eligible for aid if RGE craftsmen take care of it.

To find them, go to the Anah website, or “contact a France Rénov' advisor who will be able to guide you”, says Alain Brossais.

Many aids to finance the works

On the financing side, so don't panic.

Direct aid exists, both for audits and for renovations, but they "are still little known to individuals", regrets Jean-Dominique Masseron.

For the most part, they are calculated on the basis of household resources.

Anah notably offers two, “MaPrimeRénov”, which can go up to 70,000 euros, and “MaPrimeRénov 'Sérénité”, formerly “Living Better Sérénité”, which can reach 18,000 euros.

They target three types of owners: occupants, lessors and co-owners.

Since January 1, 2022, the first is reserved for accommodation that is over 15 years old.

"MaPrimeRénov' Serenity" is aimed at a modest or even very modest public.

Other means exist to lighten the bill.

The certificate of economy and energy (CEE) is reserved for homes that are more than 2 years old and can climb up to 60,000 euros.

And good news, "MaPrimeRénov' Sérénité" and the CEE can be combined since July 1, 2022. Local community aid is an additional lever to finance the work, in particular the zero-rate eco-loan (eco-PTZ), which can go up to 50,000 euros if the accommodation is eligible for "MaPrimeRénov'".

Three other aids exist: the Loan Advance Transfer, which will be reimbursed when the housing is resold, and the maximum of which is around 50,000 euros, as well as the energy check, ranging from 49 to 277 euros.

You can also benefit from a “boost” bonus if the work started makes it possible to “reduce primary energy consumption (heating, air conditioning and hot water) by at least 55%”, according to the government.

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