Short answer
Do I need a building permit for a PV system in Canton Glarus?
In Canton Glarus, a notification instead of a building application is sufficient in many cases for a sufficiently adapted solar system on an unprotected roof or facade. The municipal notification form with the required plans must be filed with the municipality at least 30 days before work starts. Protected objects, forests, water corridors and freestanding systems still require a permit.
Important
As of 3 August 2026, the Glarus guidance expressly states that cantonal law has no separate notification procedure under Art. 18a RPG. The 30-day notification using the municipal form is the implementation path described there; the competent municipal building authority decides whether a system can actually be notified based on site, protection status and design. Where a building application is required, work may begin only after the permit is legally effective.
At a glance
Key figures: PV permit Glarus
| Metric | Value |
|---|---|
| Notification | Municipal notification form at least 30 days before work starts |
| Pitched roof | Maximum 20 cm projection perpendicular to the roof, no overhang beyond the roof surface |
| Flat roof | Maximum 1 m above the roof rim and not visible from below at 45 degrees |
| Additional permit | From 1,000 kW, energy-law permit under Art. 5 para. 2 kEnG |
| Responsible authority | Building authority of the site municipality; GeoViewer for the preliminary check |
Decision points
What determines the right path.
The site is the first decision point: roof systems in building and agricultural zones or in other zones outside the building zone are subject to notification when sufficiently adapted; forests and water corridors are excluded. For roofs in work zones, notification is sufficient even when the system is not sufficiently adapted.
The design must be demonstrated for the actual roof. On a pitched roof, the system may project no more than 20 cm perpendicular to the roof surface, may not extend beyond it when viewed from above, and must be low-reflection and compact. On a flat roof, it may rise no more than 1 m above the roof rim and must be set back so it is not visible from below at 45 degrees.
Protection interests move the project out of the notification path: systems on cultural or natural monuments, in protected townscapes or on protected buildings always require a building permit. The guidance points to the GeoViewer layers for nature and landscape protection and for heritage protection, ISOS and KGS to make that distinction.
The cantonal process has to be understood in two layers: the law does not provide an explicit notification procedure under Art. 18a RPG. In practice, the municipal "notification form for solar systems" and the additional documents must be filed with the municipal building authority at least 30 days before work starts; the municipality normally confirms the next steps within one week.
For a full building application, plan quality matters: the cantonal guidance lists a 1:500 site plan with dimensioned system, roof plan or facade view, roof or facade section, building description and manufacturer information. A project outside the building zone also requires the questionnaire for projects outside the building zone.
System output determines an additional layer: under Art. 5 para. 2 kEnG, photovoltaic systems from 1,000 kW need an energy-law permit in addition to the building-law permit. The energy permit is issued as part of the building permit procedure, so the guidance says no separate filing is required; work may begin only after the permit is legally effective.
Sequence
How the project stays cleanly managed.
- 1
Check the site in GeoViewermunicipality, building or agricultural zone, zone outside the building zone, forest and water corridor, and cultural and natural objects. The "building permit requirement for solar systems" map shows whether the site is marked as a notification or permit case.
- 2
Classify the designfor a pitched roof document the 20 cm projection, no overhang beyond the roof surface, low reflectivity and compact arrangement; for a flat roof demonstrate the 1 m roof-rim limit and the 45-degree visibility test from below. For facades, check the contiguous, uniform areas listed in the guidance and the maximum 20 cm facade distance.
- 3
Choose the procedureuse the municipality's form for a notification case; prepare the cantonal building application for protected objects, forests, water corridors, freestanding systems or systems that are not sufficiently adapted. For systems outside the building zone, include the out-of-zone questionnaire, and for systems above 1,000 kW plan the additional energy-law review.
- 4
Compile consistent documentsthe building application should include the form, building description, product description, 1:500 site plan, roof plan or facade view, and a section showing the system components. For the municipality of Glarus, the guidance additionally asks for total area, total output in kWp and expected production in kWh per year.
- 5
File the notification completelythe municipal form and additional documents must reach the competent municipal building authority at least 30 days before work starts. According to the guidance, the municipality normally confirms the next steps within one week; for a building application, wait until the permit is legally effective.
- 6
Coordinate fire and lightning protectionfor permit applications, the municipality obtains the fire authority's opinion. Where a lightning protection system exists, the PV system must be integrated into it; the cantonal review of these points does not replace project-specific execution planning.
Checklist
Questions to settle before the quote.
- First classify the roof or facade system in the Canton Glarus GeoViewer as a notification or permit case
- Check 20 cm on pitched roofs, 1 m on flat roofs and 45-degree visibility as concrete adaptation criteria
- Submit the notification form and plans to the municipality at least 30 days before work starts
- Identify protected objects, forests, water corridors and systems from 1,000 kW as permit or additional-review cases
FAQ
More questions: PV permit Glarus
Sources
Official sources & references.
The responsible authorities are decisive. Always verify binding details – amounts, deadlines and conditions – for your specific property against the current status of the respective authority.
- Solar installation guidance, January 2026 editionCanton Glarus, Building and Environment
- Canton Glarus GeoViewerCanton Glarus, geoportal
- Federal Spatial Planning Act, Art. 18a solar installationsFederal Chancellery, Fedlex
- Spatial Planning Ordinance, Art. 32a solar installationsFederal Chancellery, Fedlex