[mattlondon]

Ideally you should design in and implement accessibility from the start.

Doing the site first then accessibility second usually either means accessibility simply doesn't get done at all (since people forget and/or priorities change before it is done), or it is retrofitted in a really half-assed way.

This is really important stuff (both legally these days in many countries, but also ethically) so giving it second-billing is probably a mistake.