Grants · German-speaking Switzerland

Subsidies in the canton of Solothurn: amounts and application procedures (2026)

Heat pumps, insulation, solar energy, CECB Plus: financial assistance from the canton of Solothurn, financial assistance from municipalities and a calculator to estimate your grant.

Last updated on 3 November 2026 · Reading time: 2 mins · By the RenovSwiss team

Illustration of a house with a heat pump, Canton of Solothurn

The canton of Solothurn supports the replacement of fossil fuel and electric heating systems, the insulation of buildings and other energy-saving measures through the Buildings Programme. Example: a 10 kW air-to-water heat pump in a house receives CHF 3,550 from the canton. Applications must always be submitted before work begins.

Source of figures : Scheme in force since 1 January 2025.

In brief

  1. The canton provides the bulk of the funding; many municipalities contribute additional funding.
  2. Submit your application before the work begins, via your canton’s ‘Programme Bâtiments’ platform.
  3. Energy-saving works are also tax-deductible.

Estimate your grant in 1 minute

Estimate of financial assistance from the canton4'650 CHF
  • Air-to-water heat pump 3'550 CHF
  • CECB Plus 1'100 CHF

Estimate based on the scale shown on this page. Maximum power taken into account: 50 W per m² of heated floor area. Local authority grants are often available in addition. The exact amount is confirmed by the canton.

What the canton of Solothurn pays

Works Cantonal assistance Main conditions
Air-to-water heat pump CHF 3,550 up to 15 kW, then CHF 1,100 + CHF 150 per kW Up to 70 kW
Geothermal heat pump CHF 6,000 + CHF 450 per kW Up to 70 kW
Connection to a district heating system CHF 12,000 + CHF 60 per kW Up to 70 kW
Wood-fired heating (pellets with storage tank) CHF 3,000, plus CHF 2,000 for the first radiators —
Insulation CHF 40 per m² Excluding windows
Combined roof and façade bonus + 40 CHF per m² —
Replacement of an electric or individual-floor heating system 15,000 CHF up to 250 m² —
Solar thermal CHF 1,800 + CHF 750 per kW From 2 kW
GEAK Plus 50 per cent of the cost, up to a maximum of 1,100 CHF for a house —

Source: Canton of Solothurn — Energy Incentive Programme.

Subsidy from the canton of Solothurn for a 10 kW heat pump
Canton of Solothurn grant for a 10 kW heat pump

Good to know:

  • The canton provides an official calculator at rechner.dasgebaeudeprogramm.ch/so.

Municipality grants

Solothurn, Olten and other municipalities offer additional grants, particularly for solar energy. To find out what support is available in your municipality, search using your postcode on francsenergie.ch (energiefranken.ch in German).

A simple example

A 200 m² house heated by oil carries out the following work:

  • 10 kW air-to-water heat pump: CHF 3,550;
  • insulation of 120 m² of façade and roof: approximately CHF 4,800 (at the basic rate);
  • CECB Plus assessment prior to the work: CHF 1,100;

Estimated total: approximately CHF 9,450 in cantonal funding, plus any funding from the municipality and the tax deduction.

Steps to follow in order

  1. Obtain a CECB Plus (GEAK Plus in German-speaking Switzerland) if you are planning several improvements: this will set out the order in which the work should be carried out.
  2. Request quotes from local tradespeople.
  3. Submit your application via the canton’s Building Programme platform and to your municipality before work begins.
  4. Wait for confirmation before starting.
  5. Carry out the work within the timeframe specified in the grant approval letter.
  6. Send the supporting documents (invoices, photos, certificates) to receive the grant.
The 6 steps to obtaining a grant
The 6 steps to obtaining a grant

Frequently Asked Questions

Will the amounts change in 2027?

The cantons generally publish their new fee scales at the end of the year. This page will be updated as soon as they are published.

Can I claim both cantonal and municipal assistance?

Often yes, but each grant scheme has its own conditions, and some municipalities deduct the cantonal grant. Check both before signing.

What about solar panels?

Photovoltaics are primarily supported by the Confederation, through Pronovo’s one-off feed-in tariff, which is claimed after the system is commissioned. Some cantons and municipalities offer an additional bonus.

What happens if I start the work too early?

Generally speaking, the help section is not very useful. Always wait for written confirmation before making a purchase or starting work.

Find a tradesperson who is familiar with the grants available in your canton

Describe your project in 2 minutes and receive quotes from tradespeople in your area. 100% free from now on, with no obligation.

Post my project

Related guides

Official sources

Last updated on 3 November 2026