From experience of past projects Web Accessibility is often considered to late in the development process.  In most cases the client or owner usually signs off the project on the visual design.  They are excited to see their idea becoming a reality and never consider the unpinning technologies used.

Its not uncommon for projects to land on our desk after the build is delivered.  We will conduct the accessibility audit and work directly with the developers to ensure all issues we identify are addressed.  However, this is the time when changes cost more.

Accessibility should be considered as early as the design stage.  Discussions should take place regarding layout and navigation and flow of an application before the build stages. Its a lot easier to over come issues while the project is still on paper.

From a developers stand point, they should be instructed on how to build, and what technologies to use instead of delivering an application that relies heavily on javascript.

The more effort made to put emphasis on accessibility equals the better chances of getting it right first time.  Even if that means you are the only person in the room who asks the question.

Build accessibility into your project, don’t try ad bolt it on.