Solar Power for Apartment Buildings: Benefits and Opportunities for Owners

Rising electricity prices and the debate over long-term energy security are major concerns for people across the country. Those who live in their own single-family homes have usually made the transition to renewable energy quickly: a few phone calls, a review of the solar installer’s quote, and soon the panels on the roof are producing clean electricity. The situation is quite different for people who live in an apartment building and own their units. The shared roof often remains unused, while expensive grid electricity is purchased month after month. Yet it is precisely this shared roof that offers enormous opportunities to drastically reduce one’s own fixed costs - provided you know how to navigate the democratic processes of the homeowners’ association.

The Collective Path to Solar Power: Why Waiting Isn’t Worth It

The reluctance seen in many condominium associations is rarely due to financial or technical reasons. More often than not, it is the fear of administrative burdens, complicated billing, or potential conflicts at the next homeowners’ meeting that nips innovative ideas in the bud. But this hesitation costs real money. While rates from local utilities have fluctuated noticeably in recent years, having your own photovoltaic system on the apartment building offers unbeatable predictability.

For people who live in their own apartments, the primary goal of a solar project is not to maximize returns by selling electricity. Rather, the goal is a sustainable reduction in monthly utility costs and greater independence from price fluctuations in the open electricity market. Since a solar system on a multi-family building can be installed much more efficiently and at a lower cost per kilowatt-peak of installed capacity than on a single-family home (due to the larger roof area) all parties benefit from significant economies of scale. The electricity generated on one’s own roof often costs only about CHF 0.08 to CHF 0.12 per kilowatt-hour over the system’s lifetime. This is a fraction of what local grid operators charge for conventional household electricity.

The Success Model for the Community: The Association for Self-Consumption (ZEV)

In order for the homeowners to be able to share and bill for solar power collectively, the appropriate legal and organizational framework is required. Swiss energy law provides an ideal basis for this through the so-called “Self-Consumption Consortium” (ZEV). Under the ZEV, the individual households join forces and act as a single, large end consumer vis-à-vis the local utility company. There is now only one main meter at the property line. The community organizes the distribution of solar power and the measurement of individual consumption within the building internally.

This model revolutionizes residents’ household budgets:

• Maximizing self-consumption: The greatest financial benefit arises when solar power is consumed directly within the building—whether for the washing machine, dishwasher, or heat pump. The more electricity that stays in the home, the less expensive grid electricity needs to be purchased. Although the utility company compensates for electricity fed into the public grid, the rates are usually significantly lower than the purchase prices, which is why the focus is clearly on self-consumption.
• Smart Utility Billing: Internal billing for solar power can now be handled fully automatically through specialized service providers or modern metering systems. Each party pays exactly what they’ve consumed. This reduces the administrative burden on the homeowners’ association committee or property management to a minimum.
• Future-Proof Infrastructure: A ZEV lays the perfect foundation for electric mobility. Charging stations in the parking garage can be seamlessly integrated into the system. This allows residents to charge their vehicles when the sun is shining brightly, using extremely affordable, in-house electricity.

The Democratic Hurdle: Securing Majorities at the Condominium Owners’ Meeting

The biggest bottleneck for a solar project in a multi-family building is not the technology, but the decision-making process under the Swiss Civil Code (ZGB). Since the roof is considered a mandatory common area in condominium ownership, no single owner can install a system on their own. A resolution by the homeowners’ association is absolutely required.

Under Swiss case law, the construction of a photovoltaic system is generally classified as a “useful structural measure” (Art. 647d ZGB), as it results in an increase in property value and a permanent reduction in operating costs. For such a proposal to be approved at the condominium owners’ meeting, a so-called qualified majority is required. This means that more than half of all co-owners must approve the project, and these co-owners must also represent more than half of all value shares.

To convince skeptical neighbors and secure the qualified majority, a strategic approach has proven effective in practice. Older co-owners often worry about the high initial investment costs or question the personal benefit if they will not live to see the system pay for itself in the long term. Here, it helps to review the condominium bylaws and the status of the renovation fund. If the renovation fund is well-funded, the investment can often be financed entirely or largely through these shared reserves. Since all owners have already contributed to this fund over the years, there is no need for drastic special assessments. This significantly lowers the barrier to approval. In addition, the solar system increases the market value of every individual unit in the building—an argument that carries significant weight in the event of a future sale of the property.

Practical Guide: Five Steps to Solar Power in Condominiums

To ensure the idea doesn’t fail due to procedural errors, committed owners should follow a clear, structured process before the topic is officially placed on the agenda.

• Analysing Potential and Preliminary Planning: Use freely available cantonal solar maps or the national solar calculator to get an initial estimate of your roof’s production potential. A specialized solar planner can also provide a non-binding preliminary quote to serve as a basis for discussion.
• Informal Preliminary Discussion: Initiate a conversation with your neighbors in the building early on. Address questions in a small group and take concerns seriously before the official meeting takes place. Reaching a consensus in advance is often half the battle when it comes to the subsequent vote.
• Develop a financing plan: Check with the property management to see if the renovation fund can be used for financing. Be sure to take government subsidies into account. The one-time payment for photovoltaic systems (Pronovo) covers a substantial portion of the investment costs. In addition, the costs are tax-deductible in almost all cantons.
• Formally Correct Agenda Item: Submit the proposal for the construction of the system and the establishment of a ZEV to the management office by the deadline. The proposal must include detailed information on the costs, financing, structural changes to the common property, and the future billing method.
• Implementation and Establishment of the ZEV: Following a successful vote, detailed planning takes place, followed by registration with Pronovo and the local utility company, and finally the installation. At the same time, the ZEV agreement is drawn up among the owners to legally establish the internal rules.baulichen Veränderungen am Gemeinschaftseigentum und dem zukünftigen Abrechnungsmodus enthalten.

Conclusion

Installing a photovoltaic system on a multi-family building is one of the smartest steps condominium owners can take to stabilize their housing and living costs in the long term. This is not a speculative investment project, but rather neighborly cooperation in the best sense of the word: investing together, saving costs together, and at the same time securing the value of one’s own property for the future. The legal framework in Switzerland, with the model of the “Association for Self-Consumption” (ZEV), is exceptionally well-established, and the administrative hurdles can be easily overcome with the right preparation.

Since the success of such a project depends heavily on the precise legal wording of the proposals and a transparent financial analysis, it is worthwhile to consult experts who understand both the fiduciary and emotional dynamics of a homeowners’ association.

Do you have questions on this topic, or would you like to learn more? Contact us for a no-obligation appointment.