A simple business-card website starts at around €600. Multi-page websites with a CMS and custom design typically start in the €1,500–3,500 range, depending on functionality.
WooCommerce-based online shops are usually set up between €2,500 and €6,000, depending on the number of products and the payment/shipping options required. You always receive the exact price as a written fixed-price quote before the project starts.