Can I install solar panels on my roof without a permit?
It depends — on your own roof solar panels can often be fitted without a separate building permit, provided the building's structure is unchanged. When the plant is mounted on your own building's roof and serves that building's needs, it is treated as part of the building's engineering system; if the load-bearing structure and exterior are not altered, it is simple repair, for which a building permit is not needed. The popular myth that "no permit is needed only up to 100 kW" is misleading — the classification line is 30 kW: below it the plant is a group-II simple structure, above it a non-special one. A prosumer connects to the grid through ESO, and settlement prices are approved each year by VERT. A second outdated myth — "you get 70–80% of the energy back": in 2026, on the most popular (low-voltage) plan, you get 63% back, while the operator keeps 37%.
📋 The rules
- Solar panels on your own building's roof, serving the building's needs, are treated as part of its engineering system
- If the load-bearing structure and exterior are unchanged, it is simple repair — no permit needed
- The classification line is 30 kW (group-II simple), above 30 kW a non-special structure — not 100 kW
- A prosumer connects to the grid through ESO; prices are approved yearly by VERT
- In 2026, on the most popular plan, you get 63% of the energy back; the operator keeps 37% (low voltage)
🔓 Exceptions
- A ground-mounted plant (not on the roof), and heritage or protected areas — a different regime that may need a permit
- If the roof's load-bearing structure is altered, or the plant rises more than 1 m above a flat-roof parapet — a project is needed
- Before the electricity-generation permit, a construction-completion declaration or act must be filed
⚠️ Penalties & fines
A plant neatly mounted on your own roof brings no fines — trouble starts when you cross a line. If the solar plant, by its power or location, needed a building permit that was not obtained, that is unauthorised construction under Article 351 CAO — a fine of €150 to €300, and far more for a non-special structure. If you connect to the grid without ESO authorisation or without construction-completion documents, the generation permit is not issued and the plant cannot lawfully feed energy into the grid. What people miss: prosumer settlement terms are changed every year by VERT decision, so old "you get 70–80% back" references are wrong — in 2026 you get 63%, which directly changes the payback. In heritage or protected areas, panels fitted without coordination may have to be removed, and the investment may not pay off as planned.
📎 Official sources
- VTPSI · rooftop solar plants and construction requirements →
- ESO · prosumer settlement →
- VERT · prosumer prices →
❓ Frequently asked
Do rooftop solar panels need a permit?
If the plant is mounted on your own building's roof, serves its needs, and the load-bearing structure and exterior are unchanged, it counts as simple repair, for which no building permit is needed. A permit may be required for a ground-mounted plant, one in a heritage area, or one that alters the structure.
From what power is a permit needed?
The classification line is 30 kW: below it a solar plant is a group-II simple structure, and above it a non-special structure with stricter requirements. The "100 kW limit" repeated online is a common oversimplification and is not the test for whether a construction document is needed.
How much energy do I get back as a prosumer?
In 2026, on the most popular low-voltage plan, a prosumer recovers about 63% of the energy fed into the grid, while the operator keeps 37%. These proportions are changed each year by VERT decision, so older references to a 70–80% return no longer apply.
How do I connect to the grid?
A prosumer connects to the distribution grid through ESO, by filing an application and agreeing the connection. Before the electricity-generation permit is issued, a construction-completion declaration or act must be filed, otherwise the plant cannot lawfully feed energy into the grid.
Can I fit panels on a heritage building?
In cultural-heritage or protected areas, fitting solar panels must be coordinated and may require a permit, because it changes the building's appearance. If panels are fitted without the necessary coordination, they may have to be removed, so it is important to check the requirements in advance.
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