When starting your business, it is crucial to cover yourself for damages you might cause or suffer from. Here are a few offers designed specifically for auto-entrepreneurs, starting from 15€ per month for assurance responsabilite civile professionnelle.
Most insurance companies offer business insurance. Amongst the most affordable are AXA (very competitive for assurance decennale for the building trade), MMA and Matmut.
Also try Companeo to get up to three quotes sent to you.