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Installers · Canton of Valais

Choosing a solar installerCanton of Valais

TL;DR

In the canton of Valais, compare at least 3 quotes and check electrical authorizations, insurance, references and contractual guarantees before choosing an installer.

Scope of this page

This page provides general guidance for the canton of Valais. It does not constitute Solar Panel Swiss certification, nor personalized recommendation, nor guarantee on a service provider.

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PV training

Electrical compliance

ESTI / partner

Minimum quote

3 offers

Installation time

Confirm

Checklist: 6 criteria for choosing your installer

PV training and experience

Check specific training, photovoltaic experience and the existence of comparable references in your region.

Electrical authorization

Check the authorization to install ESTI or the intervention of an authorized partner for electrical work and connection.

Civil liability insurance

The installer must be covered. Request a certificate to protect yourself in the event of damage to the building.

Recent local references

Ask for recent references from comparable projects. Have the stages, administrative dependencies and planned dates confirmed in writing.

Detailed quote in writing

Panels, inverter, structure, cabling, labor, warranties: each line must be detailed. Avoid opaque “all-inclusive prices”.

After-sales service and monitoring

Who manages post-installation monitoring? Is there a maintenance contract? How responsive is after-sales service?

8 questions to ask every installer

1.

Are you listed in the Solarprofi directory? Who holds the electrical installation authorization and who prepares the Pronovo application?

2.

What panels do you offer and why this choice for my roof?

3.

Can you provide me with 2-3 references for recent installations in my area?

4.

Who manages the administrative procedures (permit, Pronovo, network)?

5.

What is your production guarantee? On what criteria?

6.

What is the realistic time frame between signature and commissioning?

7.

How is the monitoring of my production managed?

8.

Is there a maintenance or monitoring contract after installation?

Red flags — warning signs

⚠

Very low price without an explanation of scope, exclusions, models and after-sales service

⚠

Refusal to provide recent local references

⚠

Quote without panel brand or inverter model mentioned

⚠

Unclear Pronovo file or unwritten administrative responsibilities

⚠

Commercial pressure to sign quickly

⚠

Subcontracting not mentioned (check who is actually carrying out the work)

Cities covered — Canton of Valais

SionMontheyMartignySierreVispBagnesGrimisuatContheyCrans-MontanaFullySavièseCollombey-MurazAyentNendazVétrozSaint-MauriceSaxonRiddesLeytronChamosonLensAnniviersTroistorrents

FAQ — Solar installers in the canton of Valais

How can I find an installer in the canton of Valais ?+

Start by comparing several sources: the Swissolar directory, the ESTI company register, local recommendations and comparable quotes. In the canton of Valais, use this page as a starting point and then directly check the authorizations and insurance of the selected company.

What does a listing in the Swissolar Solarprofi directory mean?+

The Solarprofi directory lets you find professionals under Swissolar criteria. Check the current listing, references and contractual warranties. A listing does not replace the ESTI authorization required for electrical work covered by the low-voltage installation ordinance.

Can I install solar panels myself?+

Entrust electrical work covered by the low-voltage installation ordinance to a business with the required authorization; a qualification alone is insufficient. The owner or their representative can submit the Pronovo application. Before deciding who performs mechanical installation, check roof safety, structure, insurance and warranties.

How many quotes should you get and how to compare them?+

At least 3 quotes. To compare them correctly: (1) check that you are comparing identical powers (same kWp), (2) look at the quality of the panel and inverter brands, (3) compare production guarantees (not just price), (4) take into account responsiveness and local references in addition to price.

How long does installation take in the canton of Valais ?+

Timing depends on the roof, available equipment, permissions and the DSO for your address. Ask for a written schedule separating survey, connection approval, delivery, installation, inspections and commissioning, with conditions that may change the dates.

Who handles the Pronovo application, permissions and grid connection?+

The quote must identify who is responsible for each procedure, fees, required documents and deadlines. Confirm the DSO for your address. Do not assume administrative services are included without a written mandate.

Solar prices — canton of Valais Solar subsidies Valais 2026 Brand comparison Installer directory

Sources & method

Verification benchmarks: Swissolar, ESTI, Pronovo, general conditions for installers and market practice in French-speaking Switzerland. The information on this page is general and should be confirmed directly with the relevant companies and authorities.

This content is for information only. For your project, verify prices, grants, timelines, permissions and expected returns with the relevant authorities, grid operator and installer, and check the applicable contracts.

Some pages also invite you to get in touch or highlight services, and may contain other commercial messages from the site operator.

Prepare your shortlist in the canton of Valais

Consult the site directory, compare several offers and check each contractual document before commitment.

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