To accurately estimate the cost to build a ecommerce website for your business, you will need to consider several factors, including the complexity of the project, the number of features required, and any custom design elements. On average, a basic ecommerce website can range anywhere from $500 - $10,000 or more.

The complexity of the project is a major factor to consider when estimating costs. If you're looking for a simple website with basic features and functionality, it will be less expensive than an ecommerce site with more complex design elements, custom features, and advanced functionality. Additionally, if you have specific requirements in mind or need to integrate third-party services or plugins then the cost of your website can increase significantly.

The number of features required also plays a role in determining the cost of building an ecommerce website. Basic websites may include product listing pages, shopping carts, payment processing systems, shipping calculators, customer accounts, and other essential features while more advanced sites may require additional features such as promotional codes, dynamic pricing rules and discounts, loyalty programs, gift cards, automated inventory management, and more.

If you're looking for a truly unique website design then you may also need to factor in the cost of custom web design work. Depending on your project requirements this could range from basic graphic design work to creating custom page templates or designing a completely custom interface.

Finally, if you choose to hire an external development team or agency to build your website then you'll need to consider their hourly rate as well as other costs such as hosting fees and maintenance costs.