☀️ Do I need a building permit for a rooftop solar power plant?

With conditions

Quick answer

A rooftop solar plant generally needs no building permit, but the big change is the end of net metering: annual settlement for new plants expired at the end of 2023. Installing a solar plant for the operation of the building counts as maintenance work under the Decree on the classification of structures if the device is on, in or beside the building — so a building permit is usually not needed, but you do need the distribution operator's connection consent. The key change is the billing: the net-metering scheme applied only until 31 December 2023. Anyone who applied later, or did not connect the plant in time, is no longer in the annual-settlement scheme — electricity is used in real time, surpluses are settled separately, and you also pay a network charge under the new tariff system. The myth that a new plant "wipes out your annual bill" no longer holds for new plants; only those connected by the end of 2023 keep net metering.

📋 The rules

A solar plant for self-supply on, in or beside a building counts as maintenance work under the Decree on the classification of structures, so a building permit is generally not needed.
To connect, you need the distribution operator's connection consent and the appropriate technical documentation; the connected device must meet the grid conditions.
The net-metering scheme (annual settlement) applied only until 31 December 2023; new plants after that date are no longer included in it.
For new self-supply users a real-time settlement with a shorter billing period applies: electricity is used as produced, surpluses are settled separately, and you pay for all electricity taken from the grid.
On top of the energy, a network charge under the new tariff system is payable, based on the agreed (connection) power and time blocks, not just on consumption.

🔓 Exceptions

Users who connected the plant by the end of 2023 under the previous decree keep net metering and their existing self-supply billing.
For plants on protected buildings or areas (cultural heritage), additional consents or even a permit are required despite the general exemption.
For larger plants or ground-mounted areas and interventions in the structure, stricter rules apply; a building permit and further procedures under energy law may be required.

⚠️ Penalties & fines

The biggest "penalty" with solar plants today is not a fine but a wrong expectation about the billing: anyone counting on net metering, which no longer exists for new plants, can badly miscalculate their savings. Electricity is settled in real time, surpluses separately, and a network charge under the new tariff system must be paid too, which changes the return on the investment. If you connect the device without connection consent or proper documentation, the operator will not approve the connection, and operation may be blocked or disconnected. An installation that would in fact require a building permit (e.g. an intervention in the structure, a ground-mounted plant) but lacks one is treated as illegal construction with a fine for a natural person of EUR 1,000 to 10,000 under GZ-1. In protected areas, missing consents risk a removal order. A poor installation can also mean loss of warranty, insurance problems and a fire risk.

📎 Official sources

Last verified: 2026-07-12

❓ Frequently asked

Do I need a building permit for a rooftop solar plant?

For a plant for the operation of the building, on, in or beside it, generally not, as it counts as maintenance work. You do need the operator's connection consent, however, and additional consents or a permit in protected areas.

Does net metering still apply to solar plants?

Not for new plants — the net-metering scheme applied only until 31 December 2023. Only users who connected the plant by the end of 2023 under the previous decree keep net metering, while new users are on a real-time settlement.

How is solar self-supply billed now?

For new users the electricity is used in real time and surpluses are settled separately in a shorter billing period. On top of the energy you pay a network charge under the new tariff system, tied to the agreed power and time blocks rather than only to consumption.

Is investing in a solar plant still worthwhile?

It can be, but the return differs from the net-metering era because you also pay the network charge and for electricity taken from the grid. Before buying it is sensible to check the actual savings under the new billing and to consider a battery storage unit.

What do I need to connect the plant to the grid?

You need the distribution operator's connection consent and appropriate technical documentation. The device must meet the technical conditions, and after connection a self-supply or supply-and-offtake contract is concluded.

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