Not all renovation work is equal when it comes to increasing the selling price or rental yield of a property. Some interventions generate a net gain, while others consume budget without altering buyers’ perceptions. The challenge is to measure the gap between the costs incurred and the actual valuation achieved, taking into account the regulatory context that now weighs on poorly rated homes according to the energy performance certificate (DPE).
Depreciation of energy-inefficient homes: what the regulations change for property value
The Climate and Resilience Law has introduced a mechanism that property owners often underestimate. Properties rated F or G on the DPE suffer a significant depreciation upon resale, even in equivalent locations compared to better-rated homes. This depreciation has intensified since 2023, according to analyses by the Notaires de France and the FNAIM.
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The phenomenon is not limited to sales. A legal timeline is gradually prohibiting the rental of the most energy-consuming homes. Since 2023, it has been impossible to increase the rent of properties rated F and G in tight rental zones. The prohibition will extend to F-rated homes in 2028, and then to E-rated homes in 2034.
For landlords, energy renovation is no longer just a lever for increasing value. It is a prerequisite for maintaining rental use of the property. Failing to renovate means accepting a programmed erosion of the property’s value.
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You can learn more about France Immo Express to identify priority renovation areas based on your property’s profile.
Energy renovation vs. aesthetic renovation: comparative table of return on investment
The question that structures all budgetary decisions is simple: which type of work produces the best gap between costs incurred and added value to the property? The table below contrasts the two main categories of intervention.
| Type of Work | Effect on Property Value | Effect on Charges / DPE | Duration of Impact |
|---|---|---|---|
| Insulation (walls, attics, floors) | DPE reclassification, removal of F/G depreciation | Reduction in energy bills, better thermal comfort | Long term (several decades) |
| Heating replacement | Improvement of DPE class | Direct reduction in monthly charges | Long term |
| Kitchen renovation | Increased attractiveness to buyers | No effect on DPE or charges | Medium term (decor trends evolve) |
| Bathroom renovation | Increased attractiveness, perception of quality | No effect on DPE | Medium term |
| Painting / flooring | Immediate visual impact, low cost | None | Short term |
Insulation and heating affect two levers simultaneously: they eliminate regulatory depreciation and reduce charges. In contrast, a newly renovated kitchen enhances attractiveness without changing the energy class. Energy renovations protect value, while aesthetic renovations accelerate sales.
Insulation and heating: the most significant factors affecting DPE ranking
Among energy renovation works, not all have the same weight in recalculating the DPE. Thermal insulation (walls, attics, floors) is the area with the most significant effect on overall energy performance. A poorly insulated home wastes energy regardless of the heating system installed.
Replacing an old boiler with a high-performance unit (heat pump, condensing boiler) comes second. It improves heat production efficiency, but its benefit remains limited if the building envelope allows heat to escape.
- Attic insulation: the least expensive option relative to energy gain, as heat rises and escapes primarily through the roof
- External wall insulation: thermal and acoustic gain, but heavier budget and constraints in co-ownership or protected areas
- Controlled mechanical ventilation (CMV): often overlooked, it conditions indoor air quality and complements insulation effectiveness
- Window replacement: improves perceived comfort and reduces thermal bridges, with an immediate visible effect for potential buyers
The order of priority depends on the initial diagnosis. An energy audit identifies the main losses and allows for budget allocation towards the most impactful areas on the DPE ranking.
Financial aid for renovation: a parameter that alters the return on investment calculation
The net cost of energy renovation does not correspond to the gross cost. Aid programs (MaPrimeRénov’, energy savings certificates, local aid) reduce the bill and alter the financial equation. An investment that seems unprofitable at the catalog price can become so once subsidies are deducted.
Eligibility conditions evolve regularly. The amount of aid depends on the nature of the work, the household’s taxable income, and the energy class of the property before intervention. Households owning energy-inefficient homes benefit from the highest aid amounts, which reinforces the interest in acting on the least well-rated properties.
For a landlord, the combination of financial aid and the removal of F/G depreciation can represent a greater value-adding lever than a kitchen renovation. Conversely, for a property already rated C or D, the marginal gain from additional energy renovation will be lower, and targeted interior modernization (kitchen, bathroom) may accelerate the sale more.
Deciding between sale and rental: two distinct renovation logics
The choice of work depends on the objective. A property owner preparing for a sale seeks to maximize the selling price. A landlord aims to secure rental profitability and regulatory compliance.
- For sale: the rooms that trigger the purchase decision (kitchen, bathroom, entryway) deserve particular attention, especially if the DPE is already correct
- For rental: priority goes to work that keeps the property within the classes allowed for rental, followed by those that reduce charges to make the rent competitive
- In both cases: compliance work (electricity, plumbing) does not generate visible added value, but their absence can block a transaction or deter tenants
The gap between these two strategies explains why the same budget produces very different results depending on the owner’s objective. Renovating without having previously defined whether the property will be sold or rented exposes one to poorly directed expenses.
The real estate market now penalizes energy-inefficient homes with a double penalty: depreciation upon sale and restrictions on rental. The key data remains the DPE ranking, which conditions both the perceived value by buyers, access to the rental market, and eligibility for aid. Starting from this diagnosis to prioritize work areas remains the most reliable method to transform a renovation budget into measurable asset gain.