The existing-home market is showing sharply contrasting dynamics across geographic segments and property types. Relying on a national trend to guide a purchase, sale or rental investment can lead to pricing mistakes that prove costly over several years of ownership.
Three factors now underpin a successful property transaction: a close reading of the EPC rating and its legal implications, managing financing based on net yield, and weighing up whether to sell or renovate energy-inefficient properties.
EPC ratings and rental restrictions: what the regulatory timeline means
A home rated F or G is already subject to a rent freeze when a new tenancy begins and during annual rent reviews. The ban on renting out G-rated properties has applied since 2025; F-rated properties will follow in 2028, then E-rated properties in 2034. For an investor, ignoring this timeline means buying an asset whose rental liquidity is steadily eroding.
Smaller properties present a specific challenge. Studios and one-bedroom apartments tend to receive statistically lower EPC ratings than the average apartment. A rental project focused on this segment requires thorough checks before signing, as the cost of bringing a property up to standard can consume several years’ worth of rent.
In a condominium, the situation is more complicated. If the owners’ association refuses to approve insulation work or upgrades to the communal heating system, the landlord is left in limbo: they can neither improve their unit’s EPC rating nor continue renting it legally once the regulatory deadline has passed. Before buying a condominium, we recommend reviewing the minutes of the last three years’ annual general meetings to assess the association’s ability to make decisions.
The detailed analysis available in the real estate section of Mon Portail Financier lets you compare these regulatory factors with local market data.
Net rental yield: the costs calculators leave out
Most online calculators show gross yield, and sometimes net yield after expenses. None provides the net-net yield after tax and maintenance reserves, even though this is the only metric that can be managed over the holding period.
Costs to include in your actual calculation
- Property tax, which often rises faster than rents are indexed in municipalities facing budget pressures.
- Non-recoverable condominium fees, particularly special assessments for major works approved at the annual general meeting.
- Actual rental vacancy rates in the area, which vary considerably between a university city centre and a suburban district.
- The chosen tax regime (micro-foncier, actual expenses, or LMNP under the actual-expenses regime), which can change net returns by several percentage points.
A property advertised with an attractive gross yield can look mediocre once these costs are factored in. A common mistake is to compare gross yields in two cities without adjusting for local tax rules and vacancy rates.
Mortgage financing and leverage
Extending the loan term improves monthly cash flow but increases the total cost of borrowing. For a rental investment, the financing strategy should reflect the planned holding period and the chosen tax regime. A 20-year repayment term under the LMNP actual-expenses regime generates different deductible expenses from a 15-year loan on rental income.
The debt-to-income ratio remains capped at 35% of income, including insurance. Lenders generally count rental income at only 70%, reducing borrowing capacity compared with what the gross yield might suggest.
Selling an energy-inefficient property: renovate or sell as is
Owners of F- or G-rated energy-inefficient homes face a practical choice. Renovating to reach an E or D rating keeps the property on the rental market and preserves its value. Selling as is at a discount frees up capital but locks in a loss.
Buyers have gained greater negotiating power when it comes to poorly rated properties. Buyers now factor estimated renovation costs into their offers, putting downward pressure on sale prices. A seller who has not commissioned an energy audit in advance is at a disadvantage in negotiations, with no basis to challenge the buyer’s estimates.
Summer comfort: an overlooked buying criterion
An EPC rating does not capture a home’s performance in summer. As heatwaves become more frequent, orientation, natural ventilation and solar shading matter just as much as winter insulation when making a purchase decision. Two properties with identical energy ratings on paper can offer radically different levels of comfort in July.
For buyers, checking for external shutters, ceiling fans or cross-ventilation is part of due diligence, just like reviewing the EPC. For sellers, these features are a tangible selling point during summer viewings.
Buying property: read the local market, not the national average
The recovery in the existing-home market, which remains positive in terms of transaction volumes, masks deep disparities. Transactions are picking up sharply in some areas, while others remain stagnant. Analysing the market at a micro level remains the only reliable way to set a realistic purchase or sale price.
Notarial data broken down by department and property type provides enough detail to avoid mispricing. An existing apartment in the city centre of a regional hub does not follow the same trajectory as a house in the outer suburbs, even just a few kilometres away.
A secure purchase rests on three checks before making an offer: the EPC rating and its regulatory implications over the next five years, the net-net yield recalculated using actual local tax rules, and price trends in the micro-market over the past two years. These three filters are enough to rule out most deals that turn out to be disappointing after signing.
