A real estate project relies on three technical pillars: actual (not estimated) borrowing capacity, the energy performance of the targeted property, and the regulatory timeline that now governs each transaction. Mastering these three dimensions before searching for a property avoids most of the blockages encountered between the sales agreement and the signing at the notary’s office.
Debt ratio and mortgage: what banks really calculate
The recommendations of the High Council for Financial Stability (HCSF), made legally binding since the decree of October 4, 2021, and reaffirmed in 2023-2024, impose a strict framework on banks. Two rules dominate the analysis of any borrower file.
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The first is the debt ratio capped at around 35%, including borrower insurance. This ratio is calculated on net income before tax, not on gross salary. The second is the capping of the loan duration, which mechanically reduces the amount borrowable for households with modest incomes.
In practice, a buyer who is already dedicating a portion of their income to a car loan or a student loan will see their mortgage borrowing capacity reduced accordingly. The resources available on Pratique Immo allow for better anticipation of these financial trade-offs even before contacting a broker.
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The borrower file is as important as the property itself. Banks scrutinize income stability, professional seniority, and current account management over several months. A recurring overdraft or recent payment incidents can be enough to trigger a refusal, even with a compliant debt ratio.
Energy performance certificate and Climate law: energy label as a criterion for real estate purchase
The Climate and Resilience Law (Law No. 2021-1104 of August 22, 2021) established a progressive timeline for banning rentals of the most energy-intensive housing. Properties classified as G, then F, are or will be subject to a rent freeze and a ban on rental.
A property classified as F or G loses both its rental capacity and its resale value. Buying a poorly rated property on the energy performance certificate (DPE) without factoring in the cost of energy renovation works in the total budget amounts to underestimating the actual price of the operation.
What the DPE changes in negotiation
An unfavorable DPE constitutes a legitimate negotiation lever. The seller knows that the buyer will have to finance insulation, a heating system change, or window replacements to reach at least class E.
Three elements deserve systematic verification before any purchase offer:
- The date of the diagnosis: a DPE conducted before the July 2021 reform uses a different calculation method and may no longer reflect the reality of the housing
- The nature of the works recommended in the DPE report, which provides an estimate of the energy issues to be corrected as a priority
- The consistency between the displayed class and the visible condition of the building (single glazing, lack of roof insulation, old boiler)
Aiming for a property classified A, B, or C protects against future regulatory developments and facilitates resale in the medium term.
Local real estate market: analyze before visiting
The average price per square meter of a city says almost nothing about the value of a specific neighborhood. Two streets separated by a boulevard can show significant price differences depending on proximity to transport, the quality of the local school, or the presence of noise disturbances.
The analysis of the local market is done at the micro-neighborhood level, not at the municipal level. Transaction databases, accessible via land publicity services, allow for consultation of actual sale prices (not the prices displayed in listings, which are often higher than the signed price).
Urban planning projects and neighborhood evolution
A vacant lot in front of the desired building could become a school, a parking lot, or a six-story building. Consulting the local urban planning plan (PLU) of the municipality allows for the identification of buildable areas, road projects, and easements that could change the environment of the property in the coming years.
This verification takes less than an hour at the town hall or on the urban planning geoportal and can prevent a major unpleasant surprise after the purchase.
Additional costs and the real budget of a real estate purchase
The displayed sale price represents only part of the total budget. Several items are added, and their accumulation can alter the financial feasibility of the project.
- Notary fees, which represent a higher share in older properties than in new ones
- Possible real estate agency fees, varying according to mandates
- The cost of compliance works or energy renovation, often underestimated during initial visits
- Co-ownership charges, the annual amount of which is included in the pre-dated state provided before the sales agreement
Adding these items before setting a search budget prevents falling in love with a property that is technically out of reach. The remaining amount after the monthly loan repayment must remain sufficient to cover current expenses and unforeseen events.
A well-structured real estate project relies less on discovering the “perfect property” than on the solidity of the financial and regulatory framework established in advance. The energy class of the housing, the reality of the local market at the street level, and a precise understanding of one’s borrowing capacity form a foundation that makes each visit and negotiation more effective.