Solar installation (special case) in the canton of Aargau: building permit required?
Depends on size and location
Short answer: adapted roof/façade installations: notification. Open land, protected zones, solar carport: building permit.
Legal basis: Art. 18a RPG, § 49 BauV. Building Act (BauG) and Building Ordinance (BauV). As of October 2026. Applies within the building zone and outside core zones and protected areas. Municipalities may be stricter.
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What specifically applies in the canton of Aargau
Since 2026, normal roof and façade systems only need a notification. A building permit is still required for systems in core zones and protected areas, on protected buildings, free-standing systems, solar fences and solar carports. These are exactly the cases solar installers often leave aside; we take them on.
Permit-free in the canton of Aargau: very small structures up to 5 m² footprint and 2.5 m total height with minimal impact (tool sheds, bike shelters) as well as ponds up to about 10 m² are permit-free (§ 49 BauV).
Procedure: simplified procedure without profile poles or public display for small and annex structures such as garden sheds, covered seating areas and individual parking spaces within the building zone (§ 50 BauV), up to 40 m² footprint and 3 m building height.
Submission: digitally via eBau Aargau in participating municipalities, otherwise to the municipality using the cantonal application form.
Note the official municipal instructions in the canton of Aargau and our document checklist.
Our fixed price for a solar system in the canton of Aargau
- Preliminary check CHF 149, written assessment with the procedure, documents and fee range of your municipality. Credited towards the application.
- Building application CHF 1'290, complete dossier, submission, queries and deadlines until the decision. Excl. municipal fees.
- Retrospective building application CHF 990, if a solar installation is already in place and the municipality requires an application.
Frequently asked questions
Does a solar installation (special case) require a permit in the canton of Aargau?
It depends on size and location. Adapted roof or façade systems: notification. Open ground, protected zones, solar carport: building permit. Legal basis: Art. 18a RPG, § 49 BauV.
Which procedure applies in the canton of Aargau?
Simplified procedure without building profiles or public display for small structures and annexes such as garden sheds, covered patios and individual parking spaces within the building zone (§ 50 BauV), up to 40 m² floor area and 3 m building height.
Who may submit the application in the canton of Aargau?
No formal qualification requirement for plan authors; plans must meet the requirements of § 51 BauV. You give us a power of attorney; the client and the landowner sign the application.
How much does the building application for a solar installation in the canton of Aargau cost?
Our fixed price is CHF 1'290 for the dossier, including submission and follow-up questions. Authority fees and agreed additional services are extra; the official tariff depends on the location.
Solar installation (special case) in the canton of Aargau: we submit the application.
Assessment in 2 working days, dossier in 5. Enquire without obligation.