Green Mortgage Switzerland 2026: Up to 0.8 Percent Interest Discount

More and more Swiss mortgage institutions are linking their terms to the energy efficiency of the financed property. ZKB, UBS, Migros Bank, Swiss Life and numerous cantonal banks offer discounts between 0.2 and 0.8 percent for properties with a GEAK class A or B or a Minergie certificate. Zurich Invest also launched a new offer in 2026 including a renovation calculator. With the owner-occupied imputed rental value reform, which as of 2029 will largely abolish deductions for renovations, the topic is gaining additional significance. Anyone planning to renovate or build new anyway should systematically compare the green mortgage.

What differentiates a green mortgage from a standard mortgage

A green mortgage is essentially a fixed-rate mortgage, or more rarely a SARON mortgage, with a reduced interest rate tied to the proven energy efficiency of the property. Instead of a completely separate product, it is usually a discount on the regular terms. The determining documents are usually the GEAK certificate (Cantonal Building Energy Certificate) from class B or the Minergie certificate in one of the Standard, P, or A levels. Some banks accept instead the proof of specific energy measures such as a heating system replacement, comprehensive insulation, or a photovoltaic system. The discount often applies for a set term or up to a maximum loan-to-value limit.

The key providers at a glance

ZKB offers with its environmental loan a discount of up to 0.8 percent on the fixed mortgage rate. The requirement for new buildings is a Minergie certificate or a GEAK certificate of class A. For energy renovations, the bank requires a GEAK Plus, which must be issued before the work begins. ZKB covers the certification costs at closing.

The UBS Mortgage Green offers an eco-bonus worth around CHF 500 as well as attractive terms for owner-occupied properties and new buildings with energy efficiency class A or B. The bonus is credited at closing and supplements the interest-based discount.

Migros Bank reduces the interest rate during the first maximum five years of a fixed-rate mortgage if the home has a GEAK value of A or B. For properties built before 2000, class C is sufficient. In addition, the bank reimburses the costs for the GEAK certificate or Minergie certification up to CHF 2,000.

At the cantonal level, the Berner Kantonalbank, Luzerner Kantonalbank, Thurgauer Kantonalbank, and Urner Kantonalbank, among others, offer comparable products with discounts typically between 0.25 and 0.5 percent. Swiss Life and Zurich Invest cover the insurance mortgage market with their own offers. Since 2026, Zurich Invest has also provided a renovation calculator, with which investment and energy savings scenarios can be roughly calculated.

What the discount actually provides

The effect of the discount depends on the mortgage amount, term, and the size of the discount. An example calculation illustrates the magnitude: With a fixed-rate mortgage of CHF 600,000 and a term of ten years, an interest discount of 0.25 percent saves about CHF 15,000 in interest costs compared to the standard product. At 0.5 percent, the savings rise to CHF 30,000, at 0.8 percent to CHF 48,000. It is important to check whether the discount applies over the entire term or only in the first few years. When comparing offers, the effective interest rate should be calculated over the full term, not just the starting rate.

The certificate costs of around CHF 600 to CHF 2,500 for GEAK Plus or Minergie are usually covered or reimbursed by the bank. For extensive renovations, there are also cantonal subsidy programs which apply separately to the mortgage and can also trigger contributions in the four- to five-digit range.

When a renovation is worthwhile solely because of the mortgage

A pure return calculation should combine renovation costs, energy savings, and the interest discount. A simplified formula: Investment divided by the sum of annual energy savings and annual interest benefit gives the static payback period. For example, if you invest CHF 80,000 in a heat pump and insulation, save CHF 2,500 per year in energy costs, and benefit from an additional CHF 1,500 per year from the interest discount, the measure pays off in around 20 years. With a typical component lifespan of 25 to 30 years, this results in a moderate but positive effect. In addition, there is the increase in property value and the reduction of renovation backlog, which are hard to quantify but noticeably influence the market value.

The owner-occupied imputed rental value reform further strengthens the argument for timely implementation. Until the end of 2028, value-preserving renovation shares can still be deducted from taxable income, but after that, in most cantons, they cannot. Anyone who wants to renovate anyway and renews a mortgage should coordinate both steps in time.

What to pay attention to at closing

Banks have different requirements for documentation. Before closing, the exact criteria should be clarified: Which GEAK value or Minergie label is accepted, does the discount apply only to new buildings or also to existing properties, is proof required at regular intervals, and how is the discount handled in follow-up financing. A common stumbling block is the restriction of the discount to a specific tranche, so only part of the mortgage benefits.

A comprehensive comparison remains important. A green mortgage with a 0.5 percent discount at a bank with a generally higher interest rate can be more expensive than a standard mortgage from a low-cost provider. Those who obtain several offers and compare the effective costs over the term will find the truly best solution.

Sources: MoneyPark, ZKB Environmental Loan, UBS Mortgage Green, Migros Bank.