Apartment EPC: Countdown Has Launched for 2026
Since the Climate and Resilience Law, the Energy Performance Certificate (EPC) is no longer a simple informational document. It has become the investment rental judge. In 2026, G-rated dwellings are already prohibited from re-rental, and F-rated dwellings will follow from January 1, 2028. For a landlord, exiting "thermal sieve" status is no longer an option, it's a vital urgency to preserve your assets.
However, renovating an apartment in co-ownership presents unique challenges: you don't control external wall insulation or collective heating mode. Here's the winning strategy to move from an EPC G/F to a D (minimum) by acting only on your private parts.
📅 The Prohibition Calendar (2026 Reminder)
- Class G: Rental prohibition (new or renewed leases) since January 1, 2025.
- Class F: Rental prohibition from January 1, 2028.
- Class E: Rental prohibition from January 1, 2034.
The strategic objective for all investors in 2026 is to target class D, as it guarantees rental serenity for at least the next 10 years.
🛠️ The 3 Priority Works in Apartments
1. Thermal Insulation from Inside (ITI)
In apartments, this is often the only lever for walls. The technical solution: Doubling walls facing exterior or unheated common areas (hallways) with 10cm insulation (rock wool or polyurethane).
EPC Gain: Approximately 15 to 25% less consumption.
Cost: €80 to €120 / m² of wall surface.
2. Joinery Replacement
If your windows are single-glazed or first-generation double-glazed (before 2000), they are major thermal bridges. The solution: PVC or Aluminium windows with high-performance double glazing (Uw < 1.3).
EPC Gain: 10 to 15%.
Cost: €800 to €1,500 per window (installation included).
3. Ventilation (MVHR)
A well-insulated apartment must be well-ventilated to avoid mold. If collective MVHR is defective, install humidity-controlled air inlets on windows and high-performance extraction vents in humid rooms.
💰 Profitability: What Return on Investment?
Renovating a thermal sieve requires a budget (often €15,000 to €30,000 for a 2-room), but the financial impact is immediate:
| Indicator | Before (EPC G) | After (EPC D) |
|---|---|---|
| Monthly rent | €650 (capped) | €780 (+20%) |
| Market value | €180,000 | €210,000 (+16%) |
| Tenant charges | €150 / month | €70 / month |
| IMMEDIATE ADDED VALUE | + €30,000 | |
❓ 2026 Apartment EPC & Rent FAQ
Does the rental prohibition concern furnished rentals?
Yes, absolutely. In 2026, the Climate Law applies indifferently to unfurnished and furnished rentals (LMNP). Exceptions for seasonal rentals (Airbnb type) are also reduced with new local regulations in tight areas.
Can you increase rent after energy renovation?
Yes, it's one of the rare cases where rent increase is authorized in tight zones. If works allow exiting thermal sieve status (F or G) and represent significant investment, you can uncap the rent upon lease renewal or new rental.
What aids for a landlord in 2026?
The MaPrimeRénov' Accompanied Path is open to landlords. You can also benefit from energy saving certificates (CEE) and especially the property income deficit mechanism (deducting works amount from your rental income).
Does collective EPC replace individual EPC?
In 2026, collective EPC becomes mandatory for all co-ownerships. However, to rent your property, you must have an individual EPC. Good news: if collective EPC is good, your individual EPC will automatically benefit.
Conclusion: Don't Suffer EPC, Use It
The thermal sieve "discount" is a market reality in 2026, sometimes reaching -15% to -20%. For the savvy investor, it's an opportunity to buy properties with high negotiation margin, perform targeted works, and capture value created by energy rating improvement.