The change would place an increased duty on those responsible for public buildings, and is included within the Equality Act 2010 (Amendment) Bill.
Currently "reasonable action" must be taken where a physical feature such as a step makes access to a public building difficult. The bill proposes a duty to provide a ramp in place of a single step.
Robert Ferguson, disability access officer at SDEF said a change would directly benefit Scotland's 120,000 wheelchair users.
"Entry to buildings remains a significant problem," he said.
"Many wheelchair users are still unable to access employment, education, healthcare or leisure activities."