The proposal sets out criteria for determining what constitutes a housing squeeze that would justify curbs on short-term rentals.
Authorities "should assess housing stress in the area concerned on the basis of the price-to-income ratio and its growth across time together with other indicators that allow to demonstrate that housing stress is unlikely to ease in the future," the draft said.
"The price-to-income ratio measures the affordability of housing by comparing the cost of acquiring a dwelling with the earnings of the household or population that is expected to purchase it," it said.
It said authorities should also assess population growth and housing supply and demand trends and that any measure should be non-discriminatory, proportionate and in the public interest.
The proposal said quantitative caps in areas facing a housing crunch or grandfathering rules, which allow those already operating to continue to abide by existing regulations, could be more appropriate than a ban on acquisitions or use of property.
Lobbying group CCIA, whose members include Airbnb, said the Commission should monitor national and local restrictions and resist disproportionate curbs.
"Without enforceable proportionality checks, the Affordable Housing Act would serve no one well, not the homeowners who let a room to help make ends meet, not the regions and industries that live from tourism," it said in a statement.