Technical file for modulation

Understanding, justifying and adjusting your objectives Tertiary Decree

When the requirements of the Tertiary Decree exceed the actual capabilities of the building, modulation offers an adjusted, realistic and compliant energy trajectory.

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Modulating ONE'S tertiary decree

Adjusting one's compliance with the Tertiary Decree

In view of the 2030 deadline for the tertiary decree, it may be relevant to consider modulating your energy reduction objectives. This modulation is authorized, but it remains framed by demanding technical and regulatory criteria.

To constitute a solid and admissible modulation file before the 2027 deadline, support by a qualified design office as sober energy is essential. We help you technically justify the constraints of your wealth and to secure your compliance strategy.

Find all the useful information for our white paper on the tertiary sector decree below:

Download our guide to the Tertiary Decree

Understanding modulation

Why adjust your objectives?

The Eco Energy Tertiary scheme provides two pathways to achieve compliance:

Relative targets: -40% in 2030, -50% in 2040, -60% in 2050

Absolute value targets: according to the Absolute Values VI decree

However, some commercial buildings have restrictions that are incompatible with these objectives. Modulation then allows for the definition of a realistic, measurable, and justified objective.

The causes of modulation recognized by the legislator are:

1. The cost of the work is disproportionate

When investments significantly exceed regulatory thresholds, a modulation allows the target to be adjusted to a realistic level.

2. Architectural or heritage constraints

On listed or protected buildings, certain works are impossible: modulation then becomes the only compliant option.

3. Technical constraints

Usage, building configuration or equipment sometimes limit possible actions: these constraints justify an adapted objective.

Our client case studies

Sobre Energie x EuroAirport

Problematic :

Comply with the tertiary decree in a complex context: multi -service building (offices, maintenance, servers) with intensive uses, old but still functional equipment, 31 % surface excluded from the decree and unprofitable work with sorting up to 568 years.

Solution :

• Detailed energy audit of the technical pool building

• Dynamic thermal simulation (STD) to model energy behavior

• Calculation of sorting for each action lever (envelope, equipment, systems)

• Constitution of a modulation file for economic disproportion

Results :

✅ Modulated regulatory objective validated (128.7 kWhef/m²/year)

✅ Deployment of quick -earning measurements: LED, DHWs, Heating

✅ Average sorting of the actions selected: 6.6 years

✅ Continuous improvement strategy adapted to technical and economic constraints

Find our customer case on our EuroAirport support and its modulation file:

Download the Customer case

Sobre Energie x Paris City Hall

How Paris Centre reconciled the Tertiary Decree and heritage constraints

The Paris Centre Town Hall (5,754 m²) is subject to the Tertiary Decree, but several works have proven impossible or too costly due to the listed facades, stained glass windows and the absence of economically viable solutions (insulation of sloping roofs, interior insulation, connection to district heating).

After adjustment, the absolute target value was increased from 107 to 124 kWh/m²/year. The chosen scenario relies on effective and accessible actions: insulation of the ground floor and specific points, LED relamping, heating optimization, elimination of domestic hot water systems in bathrooms, and adjustment of cooling setpoints.

This package of measures makes it possible to aim for 47% energy savings, while fully respecting heritage constraints.

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