The answer is simple – more complicated web apps cost more money. Because complicated projects have more features, team members must exert more effort and more time to complete the task. Thus, the average cost of web application development varies from $20,000  (for basic web apps) to $150,000+ (for complex enterprise applications). The timeline is an important factor to take into account,  especially if you engage a web development company that offers end-to-end solutions yet charges on an hourly basis.