Thermal Insulation France 2026: Grants and Rental Rules

Why insulate in 2026

Thermal insulation lowers the energy a home needs and can lift it into a better DPE class. Two practical reasons to act in 2026. The Loi Climat et Résilience (law no. 2021-1104 of 22 August 2021, on the fight against climate change and resilience) is phasing out the rental of thermal sieves, with G in 2025, F in 2028 and E in 2034. And MaPrimeRénov can cover part of the work, provided you follow its rules.

After insulation, the next lever is the heating system. Our heat pump guide covers it.

Where to insulate

We quote no loss shares or installed prices, because none could be confirmed on an official page. An energy audit tells you which parts of your own home lose the most heat, and written quotes give the real prices. The Service-Public MaPrimeRénov' page lists these insulation works among the eligible ones:

Roof and loft

• Insulation of sloping roofs
• Insulation of the floor of lost lofts
• Insulation of flat roofs

Floors

• Insulation of ground floors (planchers bas)

Windows and door

• Double or triple glazed windows
• Insulating entrance door

R-value in plain terms

Insulation performance is described with two indicators:

Thermal conductivity λ (W/m·K): a property of the bare material. The lower λ, the better the insulant per centimetre.
Thermal resistance R (m².K/W): depends on λ and the thickness installed. The higher R, the better the assembly insulates.

Ask each installer to state the material, the thickness and the resulting R value in the quote, so you can compare quotes line by line. The Service-Public MaPrimeRénov' page names no R threshold, so we quote none.

Walls: ITI or ITE

Two routes for wall insulation, depending on the property and the budget:

Internal insulation (ITI)

Fitted on the inside of the walls, so it takes up some interior floor space.

External insulation (ITE)

Fitted on the outside of the walls, so it leaves interior space unchanged and changes the look of the facade.

MaPrimeRénov and other aid

This section follows the Service-Public MaPrimeRénov' page, verified on 1 September 2026 and accessed on 6 October 2026. Check your own income category and the current amounts on the official simulator before signing anything.

MaPrimeRénov rules (Anah)

• The works must be carried out by an RGE professional.
• Works and services can start only after Anah acknowledges receipt of your application.
• Owner-occupants must live in the dwelling as their main residence; the aid is open to owner-occupants or landlords, and a rental must be kept for at least 6 years.
• Whole-home route (rénovation d'ampleur): at least two energy classes gained and at least two work items on the building envelope, with an energy audit before and after the works.
• Whole-home aid levels: 80% (very modest), 60% (modest), 45% (intermediate), 10% (superior incomes).

CEE

• The per-item route (parcours par geste) can be combined with energy savings certificates (CEE) paid directly by energy suppliers.
• In the whole-home route you do not apply for CEE.

Éco-prêt à taux zéro (éco-PTZ)

• Service-Public states that the whole-home MaPrimeRénov can be combined with the éco-PTZ. Ask your bank for the current conditions.

Reduced VAT

• Service-Public states that the works also benefit from reduced VAT of 5.5%. Ask the contractor to show the VAT rate on the quote.

To go further, look at solar self-consumption or the EDF Tempo tariff.

RGE certification

The RGE label (Reconnu Garant de l'Environnement) is the recognition Service-Public requires for the professional who carries out MaPrimeRénov works.

Ask the contractor for the RGE certificate before you sign.

DPE and thermal sieves

The DPE (Diagnostic de Performance Énergétique) rates dwellings by energy class. Service-Public describes the progressive rental ban:

DPE class	Rental ban
G	Since 1 January 2025
F	From 2028
E	From 2034

According to Service-Public, the restrictions apply to new lettings, lease renewals and tacit extensions. The legal basis is the Loi Climat et Résilience, law no. 2021-1104 of 22 August 2021. For landlords, insulation is how they keep the right to let the property.

If you are new to France

English-speaking owners face the same rental calendar and the same MaPrimeRénov rules as French residents. What matters is how you use the property:

Main residence: owner-occupants must live in the dwelling as their main residence to claim MaPrimeRénov (Service-Public). Use the France Rénov simulator to see which schemes apply.
Rental property: the aid is open to landlords, and a rental must be kept for at least 6 years (Service-Public). The rental ban calendar above also applies to you.
Second home: the Service-Public page mentions only main residences for owner-occupants, so ask a France Rénov adviser before you plan works on a second home.

We did not verify which documents a foreign owner must supply or whether foreign documents are accepted, so we do not give a list here. Ask the France Rénov adviser handling your file.

Mistakes to avoid

Starting works before Anah's acknowledgement

Service-Public states that works can start only after Anah acknowledges receipt of your application.

Hiring a contractor without RGE

MaPrimeRénov works must be carried out by an RGE professional, so ask for the certificate before you sign.

Skipping the audit in the whole-home route

The whole-home route requires an energy audit before and after the works.

Frequently asked questions

When can the works start with MaPrimeRénov?▼

Service-Public states that the works and services can start only after Anah has acknowledged receipt of your application. Sign and start nothing before that acknowledgement.

Is an RGE-certified craftsman compulsory?▼

For MaPrimeRénov, yes: Service-Public states that the works must be carried out by a professional recognised as Reconnu Garant de l’Environnement (RGE).

What does the whole-home MaPrimeRénov route (rénovation d’ampleur) require?▼

According to Service-Public, it requires a gain of at least two energy classes and at least two work items on the building envelope, and an energy audit before and after the works. The aid is 80% for very modest households, 60% for modest, 45% for intermediate and 10% for superior incomes.

Which homes can no longer be let?▼

Service-Public states that a dwelling with a DPE rating of G can no longer be let since 1 January 2025, that class F follows from 2028 and class E from 2034. The rule applies to new lettings, renewals and tacit renewals.

Thermal Insulation in France 2026: Grants and Rental Rules

Key Takeaways