Short answer
What you need to know first.
Guidance for owners in Canton Lucerne who want to clarify before PV planning whether their installation is notification-free, requires notification to the municipal authority, or needs a formal building permit, and what the new cantonal Energy Act (KEnG) means for their situation.
Important
This page provides general guidance based on the cantonal fact sheet on solar installations (RAWI, from 1 April 2023), the cantonal Energy Act (KEnG, in force since 1 March 2025) and federal law (Art. 18a RPG, Art. 32a RPV). Whether a specific installation is subject to notification or requires a building permit depends on building status, zoning and the requirements of sufficient adaptation. The binding assessment is made by the competent municipal authority. Protection zones and heritage status vary significantly from municipality to municipality.
Decision points
What determines the right path.
The 20 m² threshold is the first key determinant: installations up to 20 m² on roofs in building and agricultural zones are neither subject to notification nor permit requirements if sufficiently adapted. Once the system exceeds this area, the notification procedure applies, even if all other conditions are met.
"Sufficiently adapted" under Art. 32a RPV is the substantive requirement for the notification procedure or notification-free status. The key factors are: appropriate placement on the roof surface, no dominant reflective effect, and execution that fits into the roof or facade appearance. Canton Lucerne does not supplement this federal requirement with its own cantonal design rules, which simplifies assessment in clear standard cases.
Monument protection and townscape protection are the most frequent grounds for a building permit requirement in Canton Lucerne. Buildings in the cantonal or municipal heritage inventory and objects in townscape protection zones are subject to a separate protection review that is not covered by the notification procedure. This assessment should be clarified before the quote, not just at the time of notification.
Documentation for the notification must be complete: a site plan and a cross-section drawing of the planned installation are required. According to §54 Abs. 2 PBV, the notification must be submitted signed in paper form and additionally in electronic form, via the portal rawi.lu.ch or energiemeldungen.lu.ch. Incomplete documentation delays the start of the 20-day period.
The cantonal Energy Act (KEnG), in force since 1 March 2025, introduces an obligation for self-generated electricity in new buildings and certain renovations. Anyone constructing a new building in Canton Lucerne or undertaking a major renovation must comply with the minimum energy requirements of the KEnG, regardless of whether the solar installation itself requires notification or a building permit.
For facade installations, the same procedural rules apply in Canton Lucerne as for roof installations: notification-free under 20 m² if sufficiently adapted, subject to notification above that, and requiring a building permit for protected objects. Anyone planning a facade PV installation should check "sufficient adaptation" particularly carefully, as facade systems change the building's appearance more significantly than roof installations and therefore more often fall into the protection review.
Sequence
How the project stays cleanly managed.
- 1
Determine system size and zone: will the planned installation be smaller or larger than 20 m²? Is the building in a building or agricultural zone? Both together determine whether the notification procedure applies or whether notification-free status may even apply.
- 2
Check building status: is the building listed in the cantonal or municipal heritage inventory? Is it in a townscape protection zone or within an old town or historic core area? If yes, a building permit is required, regardless of installation size.
- 3
"Sufficiently adapted" per Art. 32a RPV must be ensured in planning: module layout, position on the roof surface and reflective characteristics should be planned so that the installation does not create a disturbing visual effect and fits into the existing roof appearance. This requirement is defined by federal law; Canton Lucerne adds no additional design requirements.
- 4
Submit notification at least 20 days before construction starts: the notification is completed via the portal energiemeldungen.lu.ch (rawi.lu.ch) and submitted to the municipality together with a site plan and a cross-section drawing. According to §54 Abs. 2 PBV, the notification must be submitted signed in paper form and additionally in electronic form.
- 5
Observe the 20-day period: construction may only begin after 20 days have elapsed since the municipality received the notification. If the municipality raises objections or requests additional documents, the effective waiting period extends accordingly.
- 6
Act early when a building permit is required: if the building is under protection or the installation does not meet all requirements of sufficient adaptation, pre-consultation with the municipality should take place much earlier in the project. Building permit procedures take longer than the notification procedure and can affect installation and commissioning dates.
Checklist
Questions to settle before the quote.
- The 20 m² threshold: when is a system notification-free, subject to notification, or requiring a building permit?
- Townscape protection, ISOS inventory and monument protection in Canton Lucerne: when does notification become a full permit requirement?
- Cantonal Energy Act (KEnG) since March 2025: new self-generation obligations for new buildings and major renovations
FAQ