The cost of any IT services depends on the duration of work. In the case of adjusting accessibility to certain standards, there are two possible scenarios. The first is when you come for a product and want it accessible from the start. In this case, add approximately 15-20% of the cost of developing the same project with no work on accessibility. The second option is when adding accessibility to an existing product is required. Then, depending on the complexity of its design, the duration of work can reach 50% of the total website development time.