A renovation project that goes off the rails almost always starts with a failure in documentary framing. The lists of tasks remain vague, the interfaces between trades are not formalized, and the site monitoring relies on verbal exchanges. We observe that structuring upstream, through operational checklists and standardized templates, reduces amendments and disputes much more effectively than a simple forecast schedule.
DPE Coefficient and Renovation Strategy: What Changes with the Shift to 1.9
Since January 1, 2026, the conversion coefficient of electricity to primary energy in the DPE has changed from 2.3 to 1.9. This technical modification has a direct impact on the prioritization of lots in a renovation project.
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A home heated by electricity can gain an energy class without any intervention on the building itself. Before starting insulation or window replacement work, we recommend recalculating the DPE with the new coefficient. If the home moves from F to E with this single adjustment, the budget can be reallocated to higher value-added items (ventilation, treatment of thermal bridges).
This information is often missing from most public renovation guides. A serious framing tool incorporates this variable from the diagnostic phase to avoid funding work whose energy return is already guaranteed by regulations. The RenovImmoPro work guide offers templates that allow for formalizing this type of arbitration even before consulting companies.
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Renovation Checklists: Structuring Interfaces Between Technical Lots
The site checklist is not just about ticking off tasks. Its primary role is to formalize the interfaces between trades: who intervenes before whom, which works must be accepted before starting the next lot, and what dimensional tolerances are accepted.
A concrete example: the passage of VMC ducts in insulated attics. If the electrical lot intervenes after the insulation is installed without prior coordination, the penetrations degrade the air tightness. A well-constructed checklist imposes a stop point between these two lots.
Key Stop Points Not to Overlook
- Acceptance of the support before the installation of the covering (flatness, residual humidity, cleanliness) with a signed contradictory report by both concerned companies
- Verification of air tightness after the installation of windows and before the intervention of the drywall installer, with an intermediate test if the project aims for performance above the existing RT
- Control of reservations (hatches, duct passages, evacuations) before pouring the slab or closing partitions, documented with timestamped photos
Each stop point must be documented in writing, ideally on a standardized form. Ready-to-use templates prevent reinventing the control sheet for each project and ensure consistency in monitoring between projects.
Prohibition of Renting Energy Inefficient Homes: Timeline and Impact on Work
Since January 1, 2025, any home classified as G is prohibited from being rented for any new lease, renewal, or tacit extension. Landlord owners who have not yet started work face an obligation of results, not just means.
The share of heat pumps in renovation work has significantly increased over the past three years, particularly in individual homes. This shift changes the nature of the lots to be managed: hydraulic sizing, reinforced electrical connections, acoustic treatment of the outdoor unit.
An operational work guide must integrate these specific constraints. The checklist for replacing an oil boiler with a heat pump is not the same as that for a roof renovation. Generic templates do not cover the specific requirements of each energy item, exposing the project owner to costly oversights (lack of insulation for networks, undersizing of the buffer tank).
Large-Scale Renovations and Document Tracking: Beyond Simple Spreadsheets
Comprehensive renovations, aiming for a gain of several DPE classes in a single operation, have progressed faster than one-off interventions since 2024. This type of project involves four to six lots simultaneously over several months.
Spreadsheet tracking reaches its limits as soon as the number of participants exceeds three. We recommend a structured documentary system built around three pillars:
- A schedule of interventions by lot with identification of dependencies (the plumbing lot does not start before the validation of the structural lot)
- Signed contradictory intermediate acceptance sheets, archived chronologically
- A centralized site journal that records decisions made in meetings, program changes, and incidents
- A budget tracking table updated at each work situation, comparing the initial market with any amendments
This documentary framework protects the project owner in case of disputes. A contractor who contests the non-compliance of a work is faced with a signed acceptance sheet. Without written evidence, the burden of proof becomes much heavier.
Adapting the Level of Formalism to the Project
For a bathroom renovation, three sheets are sufficient (condition before work, validation of supports, final acceptance). For a comprehensive energy renovation, the documentary file may contain around twenty documents. The formality must be proportionate to the financial and technical stakes of the project.
The temptation of “everything oral” persists among individuals who trust their contractor. This trust is not in question, but it does not replace written documentation. A meeting report drafted in ten minutes can prevent months of procedures.
Documentary framing tools are not an additional administrative burden. They structure the relationship between the client and the companies, clarify each party’s responsibilities, and constitute the only opposable basis in case of disagreement. In a market where large-scale renovations are becoming the norm, this documentary rigor makes the difference between a controlled site and a site endured.