Two logbooks, two scopes
| CIL (your lot) | Carnet d'entretien (the building) | |
|---|---|---|
| Who keeps it | The co-owner, for their home | The syndic, for the copropriété |
| Legal basis | Articles L. 126-35-2 and following of the CCH (Climate and Resilience law) | Law of 10 July 1965 (art. 18) and a 2001 decree |
| Contents | Insulation, equipment, works of the home | Maintenance contracts, major works, the building's insurance references |
| Hand-over | To the lot's buyer, at the latest at the deed | Available to any co-owner; information given to a prospective buyer |
The CIL of a flat follows the same rules as a house's: mandatory for new lots (permit filed since 2023) and for lots undergoing significant energy works since 2023.
Works voted at the general meeting
This is the copropriété's specific feature: part of your home's energy performance is decided in the common areas. External wall insulation, replacing the shared boiler, building-wide window renovation: these jobs improve your lot without you signing any individual quote.
For these works voted at the AG, transmitting the information to the co-owner is an obligation of the project owner (the co-owners' syndicate, through the syndic), not a favour. For your logbook, the reflex: collect from the syndic the documents of the shared job that concern your home (description of the works, characteristics of the materials, year, company). The AG minutes that voted the works and your share of the cost usefully complete the file: at resale, "external insulation done in 2025, share of 8,400 euros" is a quantified argument.
What you can request from the syndic
- An extract of the building's carnet d'entretien (shared boiler: contract and servicing dates);
- the technical description of recent shared works (external insulation, roof, windows, ventilation);
- the building's collective DPE or energy audit where one exists;
- AG minutes relating to works, and the multi-year works plan where applicable.
Landlord in a copropriété?
If you rent out your lot, the CIL is not required for the letting; a landlord's documentary obligations are distinct. We untangle it all here: CIL and rentals.
Gather private works, shares of collective jobs and syndic documents in the Relai Confiance logbook. Read-only sharing with the notaire, a buyer or your property manager.