Anyone who actually wants to decrease the cost of homes needs to favor allowing building more homes, whether condos or SFH, by decreasing regulation that impinges on construction for no good reason (e.g., onerous and unnecessary environmental restrictions).

But homeowners won't do that because it would cause their home values to plummet. And policy-makers don't want that because it would take down the unsustainable scam that is the current American economy ("America needs to change how we think about housing - Ever-increasing home values are a Ponzi scheme" theweek.com).

From the article I posted:
"Editorial: CEQA is too easily weaponized to block housing and slow environmental progress In the latest example of CEQA run amok, a California appellate court is considering whether noisy college students are an environmental impact, akin to pollution or habitat loss, that should be addressed before UC Berkeley can build a new dormitory to ease its student housing shortage. "

So yeah, for example, when colleges are prohibited from building dorms to house their students, those students put pressure on housing for everyone else.

From another article: "In a surprising decision, the First District of the California Court of Appeal upheld approval of a 43-unit residential project following years of "not in my backyard" obstruction, government resistance and numerous court challenges.
Though it acknowledged that the California Environmental Quality Act (CEQA) was meant to serve noble purposes, the Court expressed frustration that the legislation had devolved into a "formidable tool of obstruction," particularly against projects that increase housing density."

Another case, housing was delayed for years under claims that it could not be built because it would cause shadows.

When you can't build, that harms the poorest because the rich will just pay more to obtain that finite resource.

And this isn't an attack on environmental laws. The environmental laws are just the cudgel abused by existing homeowners to stop building. Because it benefits them.

From NPR - There's never been such a severe shortage of homes in the U.S. Here's why:
"There's another very big roadblock to home construction. "Land," says Claus. "I was just trying to buy a piece of land to build five homes on it. Unfortunately, that land went to somebody else that may put one or two on it."Claus says he wants to build more attached townhouses, or smaller homes on less land. That's what many first-time homebuyers can afford to buy. But in many places, zoning rules won't let you buy land and divide it up " you can only build one house with a big yard.

Overly restrictive zoning is a big problem nationally, says Robert Dietz, the chief economist with the National Association of Home Builders. "In certain neighborhoods you simply cannot build townhouses." "You have to build single family units on lots that are bigger than the market wants," Dietz says. "This is not a free market choice. It's a government-imposed rule.""

And here's an example of how we could solve our housing problems if we actually cared:
The Eixample District in Barcelona:

But, of course, existing homeowners would hit the roof.