Checklists can be used to evaluate how accessible your premises and services are. A do-it-yourself survey may not be as valuable as a survey by a professional, but it can be of great help. Pay attention to the scope of the audit: Does it cover the physical environment and communications, as well as the services and products that you offer.
The Museums, Libraries and Archives Council (MLA) in England provides tools for evaluating accessibility. MLA's web pages offer eg. the following tools under the headline "Helping to make your services and institutions more accessible"
Checklists in Finnish can be found on the Finnish page.
Checklists in Swedish can be found on the Swedish page.