To ensure that you find the right tradesperson for your project, it is crucial to verify their registration with Chambre de Métiers or CMA. You can do this easily by searching their name or company on the INFOGREFFE website. This will provide you with essential information such as their business address, siret number, and their registered principal activity. If you require more in-depth information, you can download the KBIS of the company for a small fee of 4.86 euros. Additionally, if the tradesperson is a sole trader under the regime ‘Micro Entreprise’, you can obtain a copy of their INSEE document from CMA, which confirms their registration as a tradesperson in France.