Combien la rénovation énergétique fait-elle gagner à la revente d'un bien en Suisse romande ?

A question that comes up regularly from our homeowner clients: "If I renovate now, what do I get back on resale?" The answer is neither binary nor universal. But it is clearer than it was five years ago, because the Suisse romande property market has begun seriously factoring the energy class into price formation.

This article brings together what we know of the 2026 market, what studies from FOVI, property trustees, and local estate agents show, and what we observe on our side in accompanying homeowners on their renovation strategy.

The effect of energy class on sale price

Several recent studies from Swiss fiduciaries and property platforms (Wüest Partner, IAZI, and various cantonal analyses) converge on a finding: the energy class significantly influences the sale price in 2026, and the effect has been intensifying since 2022.

The observed orders of magnitude:

Cumulatively, this yields gaps of 10 to 18 % between a property classed G and one classed C or B. This is what turns energy renovation into a genuine value-creation lever.

The gap is more pronounced between the lower classes (F–G) and the middle classes (C–D) than between the higher classes (A–B). This means the return on investment is stronger for properties that are initially poorly classed. A house classed G that moves to class C sees its value increase more than proportionally to the investment.

The areas where the effect is strongest

The impact of energy class on price varies by market type.

Very tight markets (central Geneva, premium Lausanne neighbourhoods, Vaud Riviera). The gap is more moderate, around 5–10 % between F and C. Location dominates price formation. Buyers are willing to pay a premium even for a poorly classed property to benefit from the address.

Moderately tight markets (Nyon, Morges, Vevey, Fribourg city, Yverdon). The effect is more marked, 10–15 % between F and C. Buyers compare more, and energy quality weighs more heavily in the decision.

Less tight markets (Vaud countryside, Broye, Jura, Valais outside premium tourist areas). The greatest effect, 12–18 % between F and C. In these markets, a poorly classed property may simply fail to find a buyer within the usual timeframe.

Tourist areas (Verbier, Crans-Montana, Zermatt on the German-speaking side). Variable effect, sometimes weak (symbolic ownership prevails), but winter comfort is important for altitude use.

The return on investment calculation

Let us take a typical case: a 170 m² detached house in Rolle, purchased for CHF 1.2 million, initially classed F under CECB. Whole-building renovation: CHF 220,000 gross, CHF 145,000 net after grants and tax deductions. New class: B.

Assumptions:

• Expected added value: +13 % of value, i.e. +CHF 156,000.
• Annual operating saving: CHF 2,800 (versus previous oil heating situation).

Calculation at different resale horizons:

Resale at 3 years after renovation.

• Added value recovered (renovation already priced by the market): CHF 156,000.
• Cumulative operating savings: CHF 8,400.
• Total recovered: CHF 164,400.
• Net investment: CHF 145,000.
• Balance: +CHF 19,400.

Resale at 7 years.

• Added value (assuming stable market): CHF 156,000.
• Cumulative operating savings: CHF 19,600.
• Total recovered: CHF 175,600.
• Balance: +CHF 30,600.

No resale (20 years' occupation).

• Cumulative operating savings over 20 years: CHF 56,000.
• Latent added value still present: CHF 156,000.
• Total: CHF 212,000 (of which CHF 156,000 is latent).
• Balance: +CHF 67,000 net cash over 20 years.

In this typical case, the operation is profitable from the third year of ownership after renovation, and clearly positive over long-term occupation. This is what is driving more and more homeowners in Suisse romande to renovate, even without an immediate plan to sell.

The situation of F or G classed properties in 2026

This has become a market issue. Several estate agents in Suisse romande report that F–G classed properties take on average 30–60 % longer to find a buyer, and often sell below the asking price.

The reasons:

• Buyers' anticipation of renovation costs. A buyer knows that a G-rated property will require CHF 100,000–200,000 of renovation to reach class C. They factor this burden into their offer.
• Cantonal restrictions on oil boilers. A buyer of a G-rated property with an ageing oil boiler knows they will need to replace it within five years, which weighs on the price.
• Lender caution. Some banks offer less favourable mortgage conditions on poorly classed properties (slightly higher rate, more restrictive LTV ratio). This argument has been spreading since 2023.
• Buyers' increased sensitivity to running costs. With rising energy prices, charges have become a more important purchase criterion than before.

For an owner of an F–G property considering a sale within three to five years, commissioning a CECB+ and examining the profitability of a renovation — even a partial one — has become a near-mandatory step to avoid seeing the price drop by 10–15 % by default.

The effect of heating alone

Many homeowners wonder whether replacing the boiler without touching the envelope affects value. The answer is nuanced.

With a recent oil boiler (less than 12 years old): buyers generally do not penalise the property, except where there is strong environmental sensitivity. The CECB class does not shift radically.

With an old oil boiler (more than 15 years old): the buyer factors in the future replacement cost, reducing their offer by CHF 15,000 to CHF 25,000. Replacing it with a heat pump before the sale can recover this gap, or a little more.

Without fossil heating (heat pump already installed): added value of +3 to +6 % depending on the quality of the installation.

Combined with insulation (whole-building renovation): added value of +10 to +18 %, see the calculation above.

Heating alone has a moderate effect. It is the envelope that unlocks the real added value. The coherence between the two is what pays best.

When to renovate: before or after purchase

For buyers considering a property to renovate, two strategies coexist.

Buy at a reduced price, renovate afterwards. The most mathematically profitable strategy. The buyer pays for the property at a discount reflecting its energy quality, and captures the renovation's added value during their occupation. Operating savings start from project delivery.

Buy a renovated property, pay the price. No building work, no management, but you pay the market price including the energy class. For those who have neither the time nor the patience for a building project, this is legitimate.

For sellers, the reverse question:

Sell as is, let the buyer handle renovation. You receive payment faster but at a lower price. Suited to inheritances, divorces, urgent situations.

Renovate before selling. You recover 80–130 % of the investment on resale, with a building timeline of 12–16 months. Worth considering if you have the time and the cash.

Renovate in stages while in occupation, sell later. The optimum for many homeowners: you enjoy the renovated home for 5–10 years, then sell at the enhanced price.

Other factors that add value to a property

Energy class is not alone. Other elements influence value, sometimes more than thermal renovation alone.

Operational photovoltaics. Adds 1–3 % to value, especially with buyers who value autonomy.

Installed EV charging point. A strong selling point for electric vehicle owners. Discreet price effect (1–2 %) but can accelerate the sale.

Modern heat pump with current warranty. Reduces the buyer's perceived future costs. +2–3 % value.

Double-flow MVHR. Improved comfort, air quality. +1–2 %, more in the premium segment.

Minergie label. Brand effect, +1–3 % compared with an equivalent CECB A property without the label.

Aesthetics and finishes. A freshly rendered and well-finished facade weighs as much as invisible insulation. Energy renovation often benefits from being combined with an aesthetic refresh.

Our perspective for 2026

The Suisse romande property market has clearly shifted. Before 2020, energy class was secondary. In 2026, it is a primary criterion, especially between F–G and C–D.

For a homeowner thinking of renovating, three pieces of advice:

1. Commission a CECB+ before deciding. The CHF 700–1,500 investment is negligible compared with the added value differences at stake.
2. Prioritise a whole-building renovation within an 18–24 month window to benefit from the cantonal bonus and minimise cumulative costs.
3. Align the timeline with the occupation and resale horizon. Renovating 8–10 years before a planned sale maximises total profitability (added value + operating savings).

For a buyer, looking at the CECB rating of a property before making an offer has become a basic reflex. A difference in class can justify a price negotiation of 10–15 %, which could not otherwise be substantiated.

Energy renovation in Suisse romande, in 2026, is no longer a activist or financially risky option. It has become a structurally sound investment whose return is delivered simultaneously through comfort, operating savings, and asset value enhancement.