Short answer
What you need to know first.
In Appenzell Ausserrhoden, sufficiently adapted roof-mounted PV systems are generally notified to the municipality at least 30 days before construction begins. Under the cantonal guide, notification includes form B05, a site plan, roof plan, roof section and system description. Protected cases or deviations require the building-application procedure.
Important
As of 20 July 2026, the 30-day notification applies only to sufficiently adapted roof-mounted systems. For protected cultural or natural monuments of cantonal or national importance, Art. 32a(3) RPV still requires a building permit; the municipality makes the binding assessment of the individual protected case.
Decision points
What determines the right path.
The municipality where the property is located is the deciding authority: the canton provides the standard B05 solar-system form, but notification or a building application is filed with the municipal building authority. A cantonal address therefore does not replace checking the specific plot’s zone and protection status.
The 30-day period comes before installation: the guide requires notification at least 30 days before construction starts. This period is neither technical grid clearance nor approval for protected cases; the quote, installation window and grid connection must not silently bypass it.
On pitched roofs, design is measurable: the cantonal guide limits the perpendicular overhang beyond the roof surface to 20 cm and requires a compact, low-reflection system. If the module layout exceeds this adaptation standard, the normal notification route cannot be assumed.
Flat roofs need a separate visibility assessment: the system may rise no more than 1 m above the roof edge and must be set back so it is not visible from ground level at an angle of 45°. Height alone is therefore insufficient; sections and elevations must show the same geometry.
Protection interests change the procedure: Art. 32a RPV privileges sufficiently adapted solar systems, while a building permit remains required for cultural or natural monuments of cantonal or national importance. The municipality must classify the protected property and inventories before filing.
Complete plans prevent follow-up questions: for notification, the AR guide lists B05, a site plan, roof plan, roof section and system description. Module count, clearances, heights and material details must match across them, otherwise the municipality cannot assess adaptation.
Sequence
How the project stays cleanly managed.
- 1
Clarify the site before requesting a quotecheck the municipality, building zone, protection or townscape status and roof type for the specific plot. For a protected property, involve the municipal building authority before presenting or ordering the module layout as a standard notification case.
- 2
Align the system layout with the design ruleson pitched roofs, check the maximum 20 cm overhang, compact layout and low-reflection surfaces; on flat roofs, show the 1 m height and 45° visibility in section and elevation.
- 3
Compile complete notification documentsprepare form B05 with the site plan, roof plan, roof section and system description. Details of modules, mounting structure, reflection and heights must be consistent in every document.
- 4
File notification with the municipality at least 30 days before construction begins, or follow the required building-application route for a protected or non-standard case. Only set the installation date firmly once the planning-law process has been clarified.
- 5
Coordinate grid connection separatelythe technical connection request, metering concept and installation notice follow the responsible grid operator’s process. A planning-law compliant system must not be equated with confirmed feed-in capacity.
- 6
Compare execution with the submitted plansbefore installation, check module edge, roof edge, setback and visible components in particular. Clarify with the municipality again before implementing changes that affect the 20 cm, 1 m or 45° requirement.
Checklist
Questions to settle before the quote.
- Clarify the municipality, protection status and the 30-day period before final installation planning
- Prepare form B05, site plan, roof plan, roof section and system description consistently
- Demonstrate the 20 cm limit and compact, low-reflection module areas on pitched roofs
- Check the 1 m flat-roof height and 45° visibility from ground level in the design
FAQ
Common questions on this topic.
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.