Since September 1, 2026, the framework for renovation assistance has profoundly changed in France. Decree No. 2026-822 of August 25, 2026, has removed the eligibility of many isolated works (insulation, ventilation, wood heating, thermodynamic water heaters) from the MaPrimeRénov’ “by gesture” pathway. For owners of thermal sieves classified E, F, or G, extensive renovation is now the main assisted pathway. This context redefines the list of works that are truly relevant for transforming one’s home.
Energy renovation: what the September 2026 decree changes concretely
Before this date, an owner could insulate their attic or replace their heating system by applying for assistance for a single gesture. This is no longer the case for applications submitted from September 1, 2026.
The new system imposes several simultaneous conditions to access funding: the housing must be classified E, F, or G in the DPE, the project must aim for a minimum gain of two energy classes, and at least two categories of insulation works must be combined. A prior energy audit and support from a certified professional are also required in certain cases.
The direct consequence is that the choice of works must be finalized before submitting the assistance application, not just before the start of the project. Owners who wish to access works on Bâtir Architecte should structure their project in advance to avoid falling outside the regulatory framework.
This administrative constraint changes the order in which one thinks about their works. It is no longer about starting with what seems most urgent, but about designing a coherent set that meets the criteria of the system.
Insulation and heating works: combining items to remain eligible for assistance
Insulation remains the main lever for the energy transformation of a home. Roofs, walls (interior or exterior), and ground floors: each item has a different impact on the DPE rating.
However, a single one of these items is no longer sufficient to trigger assistance. The “extensive renovation” pathway requires at least two combined categories of insulation. An owner who only insulates their attic will therefore need to plan a second aspect, such as treating the walls or replacing the joinery.
- Insulating the roof or lost attics often represents the item offering the best cost-to-thermal gain ratio, as heat loss through the roof is among the most significant.
- Wall insulation (either interior or exterior) effectively complements roof treatment, but its cost and complexity vary greatly depending on the building’s configuration.
- Replacing the heating system (heat pump, pellet boiler) can no longer be funded alone under the MaPrimeRénov’ by gesture scheme, but remains a key element of a coherent bundle of works.
- Controlled mechanical ventilation (notably double-flow VMC) logically integrates into a reinforced insulation project to avoid humidity and indoor air quality issues.
Structuring a solid file from the start is no longer optional.
Energy audit: a prerequisite that has become strategic
The energy audit is not just an administrative formality. It is the document that identifies the work scenarios allowing for a gain of two classes in the DPE. Without it, it is impossible to know if the proposed combination will be accepted.
Field feedback varies on the quality of these audits depending on the providers. A poorly calibrated audit can lead to oversized works or, conversely, insufficient ones to meet the required threshold. Having this audit carried out by a certified professional independent of the contracting company remains the most reliable recommendation.
Adapting housing for aging: often overlooked works in renovation projects
Online competitors mainly talk about decoration, layout, and aesthetic renovation. Works for adapting to age or disability are rarely addressed, even though they concern an increasing portion of the population.
Adapting one’s home for elderly or disabled individuals relies on targeted interventions: replacing the bathtub with a walk-in shower, installing grab bars, widening doors for wheelchair access, removing door thresholds. These works do not fall under the same scheme as energy renovation, but specific aids exist, notably through ANAH and certain departments.
PMR accessibility standards set precise dimensions to be respected (passage widths, turning areas, equipment heights). A comprehensive renovation project benefits from integrating these constraints from the design stage, rather than having to redo the layout a few years later.
Estimates and planning of the renovation site: pitfalls to anticipate
The most frequent trap is not technical; it is administrative. An assistance file submitted after September 1, 2026, automatically falls under the new rules, even if the project was designed before this date. Owners who had planned works by gesture found themselves without funding due to not anticipating the change.
On the estimates side, the temptation to compare only prices per square meter masks significant differences in material quality, ten-year guarantees, and coordination between trades. An extensive renovation involves several professionals (mason, plasterer, heating engineer, electrician) whose interventions must follow a logical order.
Order of works: a technical logic, not decorative
The structural work and waterproofing come first. Then comes insulation, followed by networks (electricity, plumbing, ventilation), and finally the finishes. Reversing this order generates costly rework.
Energy renovation requires thinking of the home as a system: insulating without ventilating creates condensation, changing heating without insulating oversizes the equipment. The energy audit, when well done, serves precisely to avoid these inconsistencies.
The renovation market in France remains marked by strong demand and lengthening intervention times. Starting consultations several months before the desired start date of the site allows for a real comparison of offers without being constrained by urgency.
