Renovating the interior of a house or apartment is not just about choosing wall colors and a new floor covering. Since September 1, 2026, the framework for public renovation aid has changed significantly, altering the way a renovation project is conceived. Understanding these new rules before starting a project helps avoid additional costs and administrative setbacks.
Interior Renovation and MaPrimeRénov’ 2026: What Blocks Isolated Projects
The classic reflex in interior renovation is to tackle one item at a time: first the insulation of a wall, then the replacement of windows a few months later, and finally the ventilation. This isolated approach now faces a regulatory wall.
Since September 1, 2026, MaPrimeRénov’ no longer finances most isolated works. Insulation, windows, ventilation, and several heating systems have been removed from the “by gesture” pathway. To remain eligible, one must shift to a comprehensive renovation or turn to Energy Savings Certificates (CEE).
This constraint changes the game for anyone considering rethinking their interior space. A simple decoration project that includes addressing a poorly insulated wall or replacing a window must now be thought of in a holistic manner, or it will not qualify for any aid. Before even consulting a decorator or interior designer, it becomes relevant to check the works to be carried out with Murmures Déco to align the aesthetic and technical dimensions of the same project.
Comprehensive Renovation: Eligibility Conditions and Impact on Interior Decor
The supported pathway of MaPrimeRénov’ imposes strict criteria. The housing must be classified E, F, or G in the energy performance diagnosis. The work program must include at least two insulation gestures and aim for a gain of at least two energy classes. A prior appointment with a France Rénov’ advisor is also required.
These requirements have a direct consequence on interior renovation. A project that plans to redo the wall coating, lay a new covering, and revise the lighting in the living room can, if it incorporates internal insulation and the replacement of ventilation, shift into the comprehensive pathway. The impact on the budget is significant: the aids then cover a much larger part of the overall project.
The Trap of Gas or Oil Heating
One technical point deserves special attention. A comprehensive renovation in a single-family home can no longer retain a gas or oil boiler while benefiting from MaPrimeRénov’. The project must plan for the replacement of the heating system with a compatible solution (heat pump, wood stove, etc.).
For a homeowner who simply wanted to modernize their living space, this constraint can turn a decoration project into a complete energy renovation project. The heating issue conditions financial eligibility, which requires it to be integrated from the design phase.
Planning Interior Renovation Works: The Order of Interventions
The temptation is strong to start with what is visible: painting the walls, choosing decorative materials, arranging the space. In practice, the reverse order proves to be more effective and less costly.
- Structural and insulation works come first. Addressing a wall after applying a decorative coating means starting over, incurring additional material and labor costs.
- Ventilation and heating are addressed next. Ducts, vents, and heat emitters directly influence the placement of furniture and the layout of each room.
- Finishes (painting, coverings, lighting, decorative elements) come last. They adapt to the technical constraints already resolved, not the other way around.
This sequence is not new in itself, but it takes on a concrete financial dimension with the 2026 rules. Grouping insulation, ventilation, and finishes into a single project opens access to the supported pathway, whereas treating them separately grants no rights.
Choosing Materials and Colors: How Light and Insulation Change Things
Internal insulation slightly reduces the usable surface area of a room. The thickness added to the walls (varies depending on the insulating material) alters the visual proportions of the space. A living room that seemed spacious may appear narrower after insulation, which influences the choice of colors and decorative materials.
Light shades on the walls and well-distributed lighting partially compensate for this perceived loss of volume. Matte effect materials absorb light, while satin finishes reflect it and visually enlarge the room. The decorative choice therefore directly depends on the technical works carried out beforehand.
Ventilation and Indoor Air Quality
A better-insulated home also becomes more airtight. Without adequate ventilation, humidity accumulates, mold appears, and coatings degrade. The mechanical ventilation system (VMC) is not a secondary technical accessory: it protects the decorative finishes over time.
Field reports diverge on this point: some craftsmen install the VMC after the finishes to avoid construction dust, while others prefer to install it beforehand to check the proper functioning of the system. In both cases, its sizing must be planned from the project’s design phase.
Coordinating Decoration and Energy Performance: The Heart of the Project
The boundary between interior decoration works and energy renovation is blurring. A project that touches on walls, lighting, and thermal comfort of a room simultaneously falls under both domains. Ignoring one in favor of the other exposes one to either a disappointing aesthetic result (visible insulation, exposed ducts) or an unchanged energy bill despite freshly painted walls.
Support from a professional capable of managing both technical and aesthetic dimensions reduces back-and-forth between trades. The final result depends less on the total budget than on the coherence between material choices, the order of interventions, and compliance with eligibility criteria for aid.
The rules of September 2026 make this coordination more necessary than before. A homeowner embarking on interior renovation works without checking their housing’s eligibility for the supported pathway risks missing out on substantial funding due to a simple lack of planning.
