First, you should check out the company's work portfolio. An agency's portfolio could include similar works that can meet your requirements and expectations. Find a passionate team that focuses on business objectives. It is a fine balance between form and function, beauty and the science of conversion. Smart teams consist of Digital Strategists that drive conversions and business objectives.
Next, check the company's portfolio. When searching for a web design company online, make sure to carefully check the website of each agency. The established and experienced web designing agencies give details of their past projects.
Finally. You should determine how fast the company respond to your email. The responsiveness is one among other factors to consider when choosing a web development company.