Looking for solar panels in La Chaux-de-Fonds means first looking at roofs that are far from ordinary: a watchmaking town in the Neuchâtel Mountains, built on a chessboard plan, with large rental buildings and long, snowy winters. Installing a solar system here, whether it produces electricity or hot water, means taking these particularities into account from the start.
This page helps you identify the possible works, the procedures to check and the way to compare the offers you will receive after your request.
Photovoltaic or thermal: what La Chaux-de-Fonds roofs allow
Two families of solutions exist. Photovoltaic panels supply electricity, used in the building or, for any surplus, fed back into the grid. Thermal collectors heat water, which is useful for the domestic hot water of a building where several households share the output.
The most common works in a town like this are:
- fitting panels on the best-oriented roof slope of a rental building;
- installing thermal collectors to supply hot water for a co-ownership;
- fitting them on a villa or a neighbourhood house, which is simpler to assess than a large building;
- adding an installation on a craft or commercial building with an extensive roof.
The large roofs of rental buildings are an asset: the larger the usable surface, the more room there is to choose where the modules go. They also raise a question specific to buildings with several flats: who benefits from the output, and how is it shared among the occupants? This question is settled with the owner or the co-ownership before installation, not after.
A UNESCO-listed chessboard: what it changes for an installation
La Chaux-de-Fonds is known for its chessboard plan, inscribed as a UNESCO World Heritage site together with Le Locle. The watchmaking heritage of these two towns is recognised on this basis, and the canton mentions it explicitly in its reference framework.
For you, the practical consequence is as follows. The federal rule (Art. 18a LAT) is that a solar installation sufficiently well adapted to a roof in a building zone generally only requires a notification. This simplification does not apply to a cultural property or within a protected site. If your building lies within a protection perimeter, or is itself listed, installation may follow a more demanding procedure, with requirements on the appearance of the modules, their colour or their position on the roof.
Do not assume anything: a building in the chessboard grid is not automatically affected, and a more recent building on the outskirts generally is not. Ask the municipality about the situation of your plot. This check takes little time and avoids ordering an installation that would then have to be modified.
Snow, cold and sunshine in the Neuchâtel Mountains
The climate of the upper part of the canton is not that of the mild lakeside. The Neuchâtel Mountains are cold and snowy, and La Chaux-de-Fonds is fully part of them. For a solar project, there are three concrete consequences:
- Snow load on the roof. The roof structure must bear the weight of the modules in addition to the snow. For an older building, the condition of the roof frame should be examined before the study.
- Snow sliding. Snow that suddenly slides off a field of panels can fall onto a pavement, a courtyard or an access way. On streets lined with buildings, this point is dealt with together with the installer: layout of the modules, snow guards, areas to protect.
- Winter output. Covered modules do not produce. So do not base your thinking on a single quarter: ask the installer to present an estimate over the full year, explaining their assumptions.
Cold is not in itself an enemy of photovoltaics, but snow and frost conditions call for equipment and fixings designed for altitude. This can be checked in the description of the quote.
Procedures: notification, permit and agreements
Depending on the situation, you will fall into one of these cases:
- Roof in a building zone, without particular protection. A notification is generally enough, under Art. 18a LAT.
- Cultural property or protected site. A building permit application is to be expected. In the canton of Neuchâtel, it goes through the cantonal SATAC desk, with the decision taken by the municipality.
- Installation subject to other requirements. The cantonal energy and environment service is the contact for anything related to energy, including the cantonal subsidy programme.
In every case, confirm the applicable procedure with the municipality or the competent cantonal service: they decide, not the installer or this page.
On the funding side, a one-off federal payment exists for photovoltaics (Pronovo), and cantonal or municipal support may be available. Conditions and filing deadlines depend on each programme: find out before signing, as some grants must be applied for before work begins.
Finally, there is the question of agreement. The owner of a villa decides alone. In a co-ownership, an installation on the common roof is decided collectively, often at a meeting of the owners. A tenant must obtain the landlord’s agreement, and it is the landlord who commissions the works. So prepare a small file to present: the objective, the type of installation, the quote, the possible grants.
Preparing your request and comparing quotes
The more precise your description, the more comparable the offers will be. Indicate:
- the type of building (villa, rental building, co-ownership, business premises);
- the roof slope envisaged, its orientation and its condition if you know it;
- the need: electricity, hot water, or both;
- your status: owner, co-owner, tenant with the landlord’s agreement;
- the building’s situation with regard to heritage protection, if you know it.
A serious quote details the equipment (modules, inverter, fixings), the installation, the connection, the procedures handled, and states what is included or not. Check that it mentions how snow is dealt with and the roof structure, two points that matter a great deal in La Chaux-de-Fonds.
What makes the cost vary: the roof surface used, the difficulty of access, the condition of the roof frame, the connection to the grid, the nature of the installation (photovoltaic or thermal) and any requirements linked to a protected site. No figure makes sense without a visit: the quote, drawn up on your roof, is what counts.
To get started, you can request a quote in a few lines: your request is passed on to craftspeople and companies in the region, who contact you to prepare a free, no-obligation quote.
To take your project in La Chaux-de-Fonds further
- The general page on solar panels.
- Works in La Chaux-de-Fonds.
- The canton of Neuchâtel, for the cantonal framework.
- Other works in the municipality: windows and double glazing in La Chaux-de-Fonds, heat pump in La Chaux-de-Fonds, kitchen renovation in La Chaux-de-Fonds.
Updated 29 October 2026