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Roofing 2026-04-01 7 min read

Redo your roof before going solar in Switzerland: decide in 4 steps

Editorial responsibility: Franck Tournier · Report a fix

TL;DR

Installing panels on a roof that will be refinished soon is often a false economy. The right decision is to compare the actual condition of the roofing, the renovation horizon and the cost of a separate project later.

A solar project should not block an obvious renovation

Removing an installation a few years later to redo the roof is expensive, complicates warranties and increases the number of stakeholders.

The 4-step method

01

Assess the actual state of coverage

The age of the roof is not enough. You need to look at the roofing, the under-roof, the infiltrations and the maintenance history.

02

Compare the life horizon of the roof with that of solar

If the roof is likely to be redone in the near future, it must be treated before or at the same time as the panels.

03

Measure the cost of a separate construction site later

Removal, storage, refitting, adaptation of fixings and loss of production often make two sites more expensive than one.

04

Decide between solar alone or roof + solar

If the roof is healthy and durable, you can move forward directly. If it is at the end of the cycle, a coordinated project is often more rational.

Frequently asked questions

Does a 20-year-old roof necessarily have to be redone before solar?+

No. Age alone is not enough. It is the actual state of the roofing and the credible renovation horizon that must guide the decision.

Can we install the panels and then redo the roof later?+

Yes, technically, but it is often a more expensive and complex solution than a coordinated project if the repair is already predictable.

Sources & method

Swissolar; roof renovation and photovoltaic integration practices in Switzerland.

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