The RE2020, which came into effect in 2022, replaces the RT 2012 as the regulatory framework for all new construction in France. It is no longer limited to thermal performance: it incorporates the carbon footprint of the building over its entire life cycle, from the manufacturing of materials to demolition. For an individual house, this translates into specific technical constraints on insulation, heating, ventilation, and the choice of structural materials.
Carbon indicators Ic construction and Ic energy: what RE2020 really measures
RE2020 introduced two specific indicators that change the design logic. The first, Ic construction, assesses greenhouse gas emissions related to materials and the construction site. The second, Ic energy, measures those generated by the building’s energy consumption over its estimated lifespan.
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These two indicators operate with upper thresholds. A project for an individual house that exceeds either of these thresholds cannot obtain its building permit. In practice, this pushes builders towards an increased mix of bio-sourced materials (wood, hemp, straw) to lower Ic construction, and towards decarbonized heating systems (heat pumps, solar thermal) to comply with Ic energy.
To better understand the requirements of the 2024 house construction standard and their relationship with the building permit, it is important to note that these carbon indicators are not mere recommendations: they are blocking criteria at the administrative stage.
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Costs and timelines RE2020: concrete gap between rural and urban areas
The financial impact of RE2020 on an individual house varies greatly depending on the project’s location. In dense urban areas, land already represents the majority share of the budget. The additional costs related to RE2020 requirements (enhanced insulation, low-carbon equipment, mandatory thermal studies) add to an already pressured budget.
In rural areas, the situation is different. Land is cheaper, but access to bio-sourced material supply chains and artisans trained in these techniques remains more limited. Project owners find longer lead times for certified structural wood or bio-sourced insulation materials.
Field feedback from project owners in 2025-2026
Several factors extend timelines in rural areas: the distance to specialized suppliers, the lack of local thermal study offices, and the need to train construction teams in new air-tightness techniques. The additional cost related to RE2020 is more concentrated on skilled labor than on the materials themselves.
In urban areas, builders have more integrated these constraints into their processes. Supply chains are shorter, and there are more study offices. The additional cost exists, but it is diluted in a higher overall budget.
Summer thermal comfort and ventilation: often underestimated requirements
RE2020 does not only aim to reduce heating consumption. It imposes a summer comfort indicator, expressed in degree-hours of discomfort. A new house must limit summer overheating without systematically resorting to air conditioning.
In practical terms, this imposes architectural choices from the design stage:
- Fixed or movable solar protections (sunshades, shutters, roof overhangs) sized according to the orientation of each façade
- A high-performance mechanical ventilation, often a double-flow VMC, capable of renewing the air without introducing outside heat
- Sufficient thermal inertia, achieved through heavy materials in flooring or interior walls, which absorb daytime heat
This summer comfort criterion has a direct impact on the choice of insulation materials. A lightweight wooden frame house, efficient in winter, may struggle to meet the summer overheating threshold without additional inertia.
Surfaces below 50 m² and extensions: relaxed requirements since late 2024
Since late 2024, temporary constructions, small extensions, and surfaces below 50 m² benefit from alternative relaxed requirements of RE2020. This evolution facilitates the transition for smaller-scale projects, without completely exempting them from a basic carbon analysis.
This 50 m² threshold particularly concerns annexes (habitable garage, independent studio, garden office) that are multiplying in rural and peri-urban areas. The simplified carbon analysis remains mandatory, but the thresholds for Ic construction and Ic energy are less stringent than for a complete house.
Strengthened certifications and controls at the building permit stage
Since January 2024, the certificates of compliance with construction rules have been reformatted. Two distinct certificates are required: one at the stage of submitting the building permit (design certificate), and the other upon completion of the work (compliance certificate). These documents must be established by authorized professionals.
The administrative control now focuses on actual results, not just on the project’s intentions. A discrepancy between the initial thermal study and the measurements upon completion can lead to a refusal of compliance.
- RE2020 certificate at the permit submission, validated by a thermal study office
- Compliance certificate upon completion, including an air-tightness test
- Specific certificate for clay soils (shrink-swell of clays), mandatory in identified areas
The strengthening of the control of construction rules, stemming from the ordinance of July 29, 2022, aims to bridge the gap between theoretical energy performance and the actual performance measured at delivery. For project owners, this means more rigorous site monitoring and enhanced coordination between architect, study office, and construction companies.