
A couple signs a preliminary agreement for an old apartment rated E in the energy performance diagnosis (DPE). The bank accepts the application but requests a financing plan for insulation work before releasing the full loan amount. This scenario, still rare a few years ago, is becoming common in credit committees.
Mortgage credit is no longer just about a rate and a term: the quality of the property, the borrower’s profile, and the prudential rules of the HCSF weigh as much as the amount requested.
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DPE and mortgage credit: a banking criterion that has become concrete
It is rarely mentioned in traditional guides, but the Energy Performance Diagnosis of housing now influences banks’ risk analysis. A property rated F or G raises additional questions during the application process.
In practice, the bank assesses the risk of depreciation of the property in the medium term and the borrower’s ability to finance the energy renovation work mandated by regulations. An energy-intensive home can complicate loan approval, even if the buyer’s income is comfortable.
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To anticipate this point, an estimate of the renovation work is included from the start in the financing plan. Some banks offer additional envelopes dedicated to renovation, linked to the main loan. Others prefer to see a signed quote before validating the offer. Feedback on this point varies among institutions and regions. To delve deeper into the financing mechanisms, mortgage credit on Trend Immo details the different formulas available to borrowers.

Debt ratio at 35%: what the HCSF ceiling changes in practice
The High Council for Financial Stability imposes a maximum debt ratio of 35% including insurance and a loan term capped at 25 years. These rules are not new, but their strict application transforms the way a file is assembled.
In practice, the debt ratio is calculated by including all ongoing monthly payments (car loan, student loan, revolving credit) and the borrower’s insurance premium. A borrower who earns a decent income but is already repaying a consumer loan may find themselves above the threshold without realizing it.
Two levers to stay below 35%
- Pay off existing loans before submitting the application: even a small outstanding balance of a few hundred euros per month weighs in the calculation. Paying off early frees up immediate borrowing capacity.
- Extend the mortgage term to reduce monthly payments while staying within the 25-year limit imposed by the HCSF. Each additional year lowers the monthly payment but increases the total interest cost.
- Adjust the amount of personal contribution: the more the contribution covers a significant part of the property’s price, the less the borrowed amount impacts the debt ratio.
Banks have some flexibility on a fraction of their files, but these exceptions are primarily reserved for first-time buyers purchasing their primary residence.
Borrower’s insurance: the cost item that is negotiated too late
Most borrowers focus on the nominal rate of the loan and neglect the insurance. This is a methodological error. Over a long term, borrower’s insurance can represent a significant part of the total cost of the loan.
Since the Lemoine law, it is possible to change borrower’s insurance at any time, without fees or penalties. This option is available from the signing of the loan offer, not just after a year as was previously the case.
Insurance delegation: how to proceed
First, compare the guarantees required by the bank (death, disability, incapacity to work) with those offered by external insurers. The delegation contract must provide a level of guarantees at least equivalent to that of the bank’s group contract.
Then, send the new contract to the bank, which has ten working days to accept or justify a refusal. In practice, refusals are rare as long as the equivalence of guarantees is respected. The difference in premium between a group contract and an external delegation often amounts to several thousand euros over the total loan term.

Mortgage loan offer: points to check before signing
The loan offer arrives by mail or electronically. There is a mandatory reflection period of ten days before it can be accepted. This period is non-negotiable, and no signature before its expiration is valid.
Three elements deserve careful reading:
- The APR (Annual Percentage Rate), which includes the nominal rate, processing fees, insurance cost, and guarantee fees. It is the only reliable indicator for comparing two offers against each other.
- The conditions for early repayment: some offers provide capped early repayment fees, while others eliminate them. This point matters if one plans to sell the property before the end of the loan.
- The terms for adjusting monthly payments: being able to increase or decrease payments during the loan offers valuable flexibility in case of a change in professional situation.
Comparing several offers remains the most effective method for obtaining good conditions. The APR allows for direct comparison, but contractual flexibility and additional fees are also considered.
The structuring of a mortgage loan relies on a combination of technical parameters that interact: rate, term, insurance, contribution, DPE of the property. Working on each item separately before consolidating the file yields better results than negotiating only the nominal rate. It is on all these lines that the real cost of borrowing is determined.