Basic economics says prices are set based on supply+demand not cost. Cost of course affects supply, but right now the main housing supply limiter in urban areas

Basic economics says prices are set based on supply+demand not cost. Cost of course affects supply, but right now the main housing supply limiter in urban areas is restrictive permitting and to some degree lack of construction labor (a nationwide echo of 2008). As a result increased construction costs mostly come out of landowner's returns. Most efficiency standards actually lower monthly housing costs, including your two examples of solar panels and natural gas bans. Note that the solar can be built offsite, and solar + electric is a natural (hah) combination.