How much does it cost to build a website for a small business?

How much does it cost to build a website for a small business? I am just careful because I don't wanna overpay. I need to create a professional website having more functionalities, any social media integration, and a modern representative look of a limited company. Something impressive that says: "yes, this is the company which I search for and will work for me". It must be suitable for the best marketing practices. But I don't know how to get it in some affordable price level, or what will be the lowest website costs for small businesses. How much should I pay for a web developer? How much does a website cost to build?

Nicely,
Dave Evans