Free tool · Décret tertiaire
Are you subject
to the décret tertiaire?
The instinct is to read the threshold building by building. The text adds up within a single land parcel: a vet with a 700 m² practice whose annexe adds another 400 m² is within scope. Two unrelated addresses are not. Thirty seconds to find out, and the list of what to gather before 30 September.
OPERAT · reporting deadline
Next deadline for reporting energy consumption on ADEME's OPERAT platform: September 30, 2027 at 11.59 pm.
Am I subject to the décret tertiaire?
Thirty seconds for an orientation — not a regulatory qualification.
Step 1 of 4
How it works
Three questions, one minute
The cumulation rule, applied
The threshold is not read building by building. The tool adds up by site and by land unit, as the text does.
The real scope
Multi-occupancy, ratchet effect, exclusions: the three traps that wrongly convince people they are out of scope.
What comes next, not just the verdict
The three pieces of data to gather, the deadline, and the lease question — enough to act on as soon as you leave the tool.
Project decoder
Start my project
4 minutes. 6 questions. A personal reply from Hélène or Alexis by Thursday 15 October at the latest.
Why 4 minutes instead of a contact form?
Because the person who calls you back is not a salesperson — it is the architect who will draw your project. We want to understand before we propose a meeting, not the reverse.
We answer personally by Thursday 15 October at the latest. Phone, short video call, or voice note — your choice.