Sprawl vs. Density—but California Has a Third Option

As California debates where to build more housing, a new study examines how immigration-driven population growth has contributed to the loss of farmland and natural habitat.

California voters face a consequential decision on November 3. Proposition 45 would streamline environmental reviews for development projects, potentially making it easier to build on undeveloped land.

At the center of the controversy is Tejon Ranch, north of Los Angeles, where developers envision approximately 40,000 homes. Supporters argue that California needs more suburban housing. Opponents warn that weakening environmental protections could accelerate urban sprawl.

As The New York Times reported on October 15, the dispute reflects California’s longstanding debate over development.

The rugged expanse of Tejon Ranch in Southern California.

But both sides largely overlook a fundamental question: Why must California continually accommodate more people, particularly when international immigration – a policy choice – has been a major contributor to its population growth?

The Missing Variable: Population Growth

The debate as described in the Times presents Californians with two choices: expand outward into farmland and natural habitat or build higher-density housing within existing communities.

Neither approach directly addresses the underlying pressure created by population growth.

A new NumbersUSA study, Paving Paradise: 50 Years of Population Growth in California, provides an important perspective.

Between 1982 and 2022, California converted approximately 3,740 square miles of farmland and natural habitat to developed uses—roughly the combined area of Delaware and Rhode Island.

The study attributes 91% of this land conversion to population growth, with just 9% attributable to increased land consumption per person.

California has spent decades promoting smart growth through compact development and conservation. These measures have helped reduce land consumption per resident, but continued population growth has more than offset those savings.

Moreover, a growing population places additional demands on water supplies, energy, transportation, and public services regardless of whether development is suburban or urban.

Immigration and California’s Growth

Immigration has been a major contributor to California’s population growth, even as the state has experienced substantial domestic outmigration.

Federal immigration policy therefore influences long-term housing demand, infrastructure requirements, and environmental pressures. This one federal policy has an outsized influence on these demands, yet immigration-driven growth receives little attention in the Proposition 45 debate.

A 2026 survey revealed a striking preference among California likely voters for limiting future population growth: 86% favored slower growth, a stable population, or population decline, while only 11% favored a return to rapid growth. Support for population stabilization or decline was consistent across party lines.

A Third Choice: Stabilization

The findings of Paving Paradise suggest that California cannot address the loss of farmland and natural habitat through development policies alone. While sprawl and higher-density development represent two ways of accommodating population growth, a third option addresses the underlying demand for development: slowing and ultimately stabilizing population growth.

Federal immigration policy is central to this discussion. California’s 52 U.S. representatives and two senators can help shape national immigration laws and, consequently, the pace of future population growth. As NumbersUSA observes in its discussion of Paving Paradise, “California cannot control national immigration levels.” Congress, however, has the authority to change those levels through federal legislation.

At the state level, lawmakers can examine policies that influence migration and population trends, including eligibility for state-funded public benefits, housing assistance, and other programs. Research indicates that public benefits can influence migration decisions, although employment opportunities and family networks are also important factors.

California’s recent restrictions on Medi-Cal eligibility for certain undocumented adults illustrate how benefit policies are already being reconsidered amid rising costs.

The fundamental question is not simply how California should accommodate millions more people, but whether continued population growth should be accepted as inevitable.