Of course, the easiest and most cost-effective way to have a WCAG compliant website is to build it that way in the first place. And while it’s never too late, the absolute best time to start thinking about accessibility is when you are planning your site’s user experience (UX) and designs.
Accessible Design
Shifting Left: Design and UX Accessibility
Can You Rely on Your Web Agency for Accessibility?
How can you tell whether your digital agency has the expertise to effectively address your site's accessibility issues.