RE2020: The French Energy Standards Reshaping New-Build Ski Property

Since January 2022, every new-build residential property in France has had to comply with the RE2020 environmental regulation — the successor to RT2012 and the most ambitious new-build energy standard France has ever enforced. For British buyers of French ski property, understanding RE2020 matters practically: it affects what a new-build apartment or chalet will look like, how it will heat, how much it will cost to run, and in many cases how much it costs to build in the first place. This guide explains what RE2020 means for Alpine new-build property in 2026.

The short version: RE2020 is not just an incremental tightening of the previous regulation. It introduces a genuine carbon-footprint dimension to the energy calculation (not just operating energy), it severely restricts gas-based heating in favour of heat pumps and electric solutions, and it bakes in significantly tougher insulation requirements. Any chalet or apartment built and delivered in the French Alps from 2022 onwards has been designed to these standards, and buyers should understand what they are getting.

This piece covers what the regulation actually requires, how it shows up in a real Alpine new-build, what it costs the developer (and therefore the buyer), and how it affects running costs, rental appeal and resale value over time. For the broader new-build buying picture, see our new-build ski apartments page; for the complete VEFA walk-through, the buying process guide remains the starting point.

RE2020 replaces the previous thermal regulation (RT2012) with a broader environmental regulation covering three main areas: operating energy consumption (Bbio and Cep), operating comfort in summer (DH, or degrés-heures), and whole-life carbon footprint including construction materials (Ic construction). This third dimension is the headline change: French new-build construction must now account for the embodied carbon in concrete, steel, glass and other materials, not just the building’s operating energy.

The regulation is enforced through a detailed energy and carbon calculation (étude thermique and étude carbone) that every new-build project must submit for planning approval. The thresholds tighten progressively — the initial 2022 limits were relatively accommodating, with meaningful tightening in 2025 and further reductions scheduled for 2028 and 2031. Developers building in 2026 are now working to the 2025-tier thresholds, which are notably stricter than the initial RE2020 limits.

For Alpine properties specifically, the DH summer comfort metric has less binding force than in Mediterranean regions, but the Bbio heating envelope metric is genuinely demanding — Alpine climates require more heating than the French national average, and RE2020-compliant design must account for this through thicker insulation, better glazing, and reduced thermal bridging. Expect 30–40 cm of insulation in wall assemblies of RE2020-compliant Alpine new-build properties, against 20–25 cm for older RT2012 construction.

The single most visible consequence of RE2020 for Alpine new-build property is the practical elimination of gas-based heating. RE2020 sets a carbon-per-m² ceiling so tight that gas boilers cannot meet it in a single-family chalet or low-density apartment building. The default heating solution is therefore an air-source or geothermal heat pump, often combined with underfloor heating distribution and supplemented by wood-burning stoves in chalet lounges for ambience and peak-load support.

Heat pumps deliver typical coefficients of performance (COP) of 3.0–4.5 in Alpine winter conditions — meaning every kWh of electricity input produces 3–4.5 kWh of heat output. Combined with well-insulated modern construction, this produces chalets and apartments that cost meaningfully less to heat than equivalent older properties. Expect annual heating costs of €1,200–2,500 for a well-designed 120m² RE2020 apartment in a Portes du Soleil resort, compared to €2,500–4,500 for a comparable 2005-vintage apartment with gas or direct electric heating.

Wood-burning stoves and fireplaces remain permitted and are actively encouraged in RE2020 specifications because wood is classed as a low-carbon fuel source. A well-specified chalet will typically combine an air-source heat pump as the primary heating system with a high-efficiency wood stove in the main living space — the combination delivers comfort, character and compliance simultaneously. Fireplaces are a strong rental selling point and genuinely improve the chalet experience on cold winter evenings.

Traditional Alpine construction (heavy concrete structure, reinforced foundations, masonry walls with a wooden cladding layer) scores poorly on the new Ic construction carbon metric because concrete and steel have high embodied carbon. RE2020 has therefore pushed French Alpine developers towards hybrid timber-frame construction — using a concrete or steel ground floor and foundations with prefabricated cross-laminated timber (CLT) or engineered wood upper floors. This is genuinely different from how Alpine new-build looked in the 2010s.

The shift to timber-heavy construction has a few practical consequences. Construction speed often improves (prefabrication is faster than in-situ concrete), acoustic performance sometimes requires careful detailing (timber transmits sound more than concrete), and the aesthetic typically trends towards exposed wood finishes, warm interiors and visible timber structures — which happens to align neatly with buyer preferences for Alpine character anyway. Most buyers experience RE2020-compliant new-build as warmer and more inviting than earlier concrete-dominated designs.

Glazing specifications have tightened significantly. Triple glazing is now standard across RE2020 Alpine new-build, with U-values typically around 0.8 W/m²K for the full window assembly. Solar gain is carefully managed through orientation and overhangs to prevent summer overheating. Expect generous south-facing glazing in main living spaces and more modest glazing on north elevations, with all windows tuned for low thermal loss and controlled solar gain.

French construction economics research suggests RE2020 adds approximately 5–12% to the construction cost of a new-build residential property compared to the previous RT2012 standard, depending on building type and location. This cost is passed through into purchase prices, but is typically offset by meaningful reductions in running costs over the life of the property. For a €600,000 apartment, the RE2020-adjacent cost increment is perhaps €30,000–70,000 in developer build costs — which translates into a proportionally higher sale price.

Heat pumps, triple glazing, prefabricated timber structures, thicker insulation assemblies and more detailed compliance documentation all contribute to the cost increase. The largest single item is usually the heating system replacement — moving from a simple gas boiler to a complete air-source heat pump plus underfloor heating distribution and a supplementary wood stove typically costs €15,000–30,000 more per unit in a standard family apartment or chalet.

Developers have been absorbing some of the RE2020 cost through economies of scale and supply-chain optimisation, and the gap between RE2020 and legacy construction prices has narrowed meaningfully through 2024–2026 as standardisation has improved. In practice, buyers of 2026 new-build are paying roughly 3–8% more per m² than 2020 new-build in equivalent positions, but receiving a materially more efficient, more comfortable and more resale-resilient property. The net economics favour new-build strongly.

The operating cost savings are real and measurable. A well-designed RE2020 Alpine apartment of 100m² in a Portes du Soleil resort typically consumes 40–60 kWh per m² per year of total energy (heating, hot water, ventilation, lighting) — against 90–130 kWh/m² for older 2000s-era apartments and 150+ kWh/m² for pre-RT2005 construction. At current French electricity prices (roughly €0.20/kWh including grid fees and taxes), this translates into annual energy bills of €800–1,500 versus €2,000–3,500 for older equivalents.

These savings compound across the ownership period. Over a 20-year hold, a buyer of an RE2020 apartment will typically spend €15,000–25,000 less on heating and running costs than a buyer of an equivalent 2005-vintage property — a meaningful difference that materially affects total cost of ownership. For rental-focused investors, lower running costs also improve net rental yields because the owner typically covers utility costs during vacancy periods.

Heat pump reliability has been a concern for some buyers, particularly British buyers unfamiliar with the technology. In practice, modern Mitsubishi, Daikin and Atlantic heat pumps installed in RE2020 Alpine properties are highly reliable, with 15–20 year expected lifespans and straightforward servicing. Cold-weather performance has improved significantly in the latest generation of inverter-driven units, and Alpine temperatures rarely exceed the operating envelope of modern systems.

For rental-focused buyers, RE2020 compliance is not just a regulatory box — it materially affects the guest experience. Modern Alpine guests increasingly notice and appreciate well-insulated buildings, comfortable indoor temperatures without overheating, modest heating bills, and the presence of renewable heating systems. These factors show up in reviews and book-to-book conversion rates, and increasingly in the pricing premium that premium properties can command over commodity inventory.

The French DPE rating (Diagnostic de Performance Énergétique) that appears on every rental listing and every sale listing makes this economically visible. RE2020 new-build properties typically achieve DPE ratings of A or B, while older properties frequently fall into D, E, F or G. From 2025, French law has progressively banned the rental of the worst-performing properties (F and G ratings initially, E from 2028). This means new-build RE2020 property has both an absolute quality advantage and a regulatory advantage that will strengthen over time.

For buyers considering resale value in 10–15 years, the DPE trajectory matters enormously. A 2026 new-build A-rated apartment will likely still be A-rated in 2040, while a 2005-built D-rated apartment may face progressive rental restrictions and significant renovation costs by the same date. The RE2020 regulatory environment therefore creates a growing performance gap between new-build and older stock — a gap that favours new-build owners both operationally and at resale.

RE2020 has added cost to French Alpine new-build, but has also materially improved the product. Buyers in 2026 receive better-insulated, better-heated, lower-carbon and ultimately more resilient properties than their 2015 equivalents, at a modest price premium that is usually offset by operating cost savings over the ownership period. For long-term buyers, the net economics are clearly favourable.

The regulatory trajectory will continue — 2028 and 2031 bring further tightening of the carbon and energy thresholds, and the long-term direction is unambiguous. Any new-build property purchased in 2026 is being built to a standard that will remain competitive well into the 2040s and beyond. Older properties, by contrast, face a growing gap in both operational cost and regulatory compliance as the DPE rules tighten.

For British buyers specifically, the combination of the 20% VAT reclaim on new-build VEFA, the improved running costs of RE2020 construction, and the taper-relief CGT treatment on long holds produces one of the most tax-efficient and operationally favourable ownership structures available in any European second-home market. Our new-build ski apartments page shows current VEFA inventory; reach out to the Domosno team for a tailored shortlist.