Experience: You must look for the company which has good experience in the field of web design. A web design company with multiple years of experience is very competent and understands the need and requirements of client.
Methods of Working: Do keep an eye on the methods of working of the company. Check out the procedures that are followed by a best web design company, which will save you from all the troubles and worries.
Reputation: Do a little research on the history of companies and their profile to get to know about their reputation.
Cost Effectiveness: Measure the cost effectiveness of a web design company and compare it with your budget to see whether it matches your investment or not.
Conclusion: The above mention points are very effective for choosing one most experience and skillful web design company.