A real estate project is prepared on technical bases before it becomes a matter of taste or budget. Energy regulations, financing conditions, and obligations related to condominiums have significantly evolved in recent months. Understanding these changes helps avoid costly mistakes when buying, selling, or investing in rental properties.
DPE and electrical coefficient: what changed on January 1, 2026
Since January 1, 2026, the conversion coefficient of electricity in the DPE has changed from 2.3 to 1.9, in accordance with the decree of August 13, 2025. In practical terms, a home heated by electricity can show a better energy label without any renovation work being carried out.
For a buyer, this evolution changes the market reading. A property rated F or G a few months ago can now appear as E, removing it from the category of energy sieves. The risk: buying a property thinking it has been renovated when only the calculation method has changed.
The information to verify during a visit remains the date of the diagnosis. A DPE conducted before 2026 with the old coefficient does not reflect the same reality as a later DPE. Requesting the complete report, and not just the label, allows you to distinguish a real performance gain from a simple recalculation effect. To keep up with these regulatory changes applied to the market, you can access the real estate category on Immo Guide which regularly addresses these topics.
Mandatory collective DPE in condominiums: the new deadlines
The collective DPE is now mandatory for all condominiums whose building permit was issued before January 1, 2013. The schedule has been rolled out progressively:
- Condominiums with more than 200 lots: obligation effective since January 1, 2024.
- Condominiums with 50 to 200 lots: since January 1, 2025.
- Condominiums with 50 lots or fewer: since January 1, 2026.
This collective diagnosis evaluates the overall energy performance of the building, not just that of an apartment. It conditions the decisions on works voted in the general assembly and directly influences the value of the lots upon resale.
For an investor, the absence of a collective DPE in a concerned condominium is a warning signal. This may indicate a lax property manager or upcoming renovation costs that have not yet been budgeted. Before any purchase in a condominium, checking the existence and content of this diagnosis is part of the reflexes to adopt.
Borrowing capacity and mortgage rates: assessing your real budget
The amount a bank is willing to lend depends on the debt ratio, capped at 35% of net income, including borrower insurance. This rule, set by the High Council for Financial Stability, remains the first filter for any real estate purchase project.
The real budget far exceeds the displayed price of the property. Notary fees represent 7 to 8% of the price in the old market and 2 to 3% in the new market. In addition, there are potential agency fees, loan guarantee fees, and the cost of renovations.
A mortgage simulation carried out before the search phase helps avoid visiting properties outside the budget. Several banking institutions offer online simulators, but a meeting with a broker or a bank advisor provides a more reliable estimate, taking into account the specifics of the file (type of contract, professional seniority, available savings).
Real estate diagnostics before purchase: checks not to overlook
The technical diagnostics file (DDT) accompanies any real estate sale. It includes several mandatory documents, and their careful reading conditions the quality of the purchase decision.
- The individual DPE, to be cross-referenced with the collective DPE in the condominium to detect any inconsistencies.
- The asbestos diagnosis for buildings whose building permit was issued before 1997.
- The state of risks and pollution (ERP), which lists natural, mining, technological risks, and coastal erosion applicable to the plot.
- The electricity and gas diagnosis for installations over 15 years old.
An incomplete or outdated diagnosis can delay the signing at the notary, or even give the buyer a renegotiation lever. As a buyer, demanding the entire DDT before making an offer protects against unpleasant surprises.
For properties located in risk areas, the ERP deserves special attention. It notably mentions the classification in the area of clay shrink-swell exposure, a phenomenon that causes structural cracks in individual houses and whose financial consequences can be severe.
Condominium and rental management: anticipating charges before investing
A rental investment in a condominium involves recurring charges whose amount fluctuates according to collective decisions. Energy renovation works, made more frequent by obligations related to the collective DPE, represent an expense that weighs on profitability.
Consulting the minutes of the last three general assemblies before purchasing a lot in a condominium provides a concrete view of the works voted, the planned calls for funds, and any unpaid dues. The building maintenance log and the works fund (fed by a mandatory annual contribution) complete this analysis.
Rental management itself, whether delegated to an agency or managed directly, generates variable costs: unpaid rent insurance, rental vacancy between two tenants, minor repairs. Integrating these items into the profitability calculation from the start avoids disappointments once the property is acquired.
The real estate market in 2026 rewards buyers and investors who read diagnostics with as much attention as listings. The value of a property is no longer limited to its surface area and location: its energy label, regulatory compliance, and the financial state of its condominium now weigh equally in the balance.
