Mount Laurel Doctrine

What Is the Mount Laurel Doctrine?

The Mount Laurel doctrine is New Jersey’s rule that local zoning may not exclude housing that lower-income families can afford. It takes its name from Mount Laurel Township in Burlington County, which a local NAACP branch and lower-income Black and Hispanic plaintiffs challenged. The court found the town’s zoning allowed only housing beyond the reach of low- and moderate-income families.

In 1975, the New Jersey Supreme Court held that a developing municipality must “presumptively make realistically possible an appropriate variety and choice of housing.” That includes its fair share of the region’s present and future need for low- and moderate-income homes. The court rested its ruling on the state constitution’s requirement that zoning serve the general welfare. Because it rests on state law, the doctrine applies only in New Jersey.

How the Mount Laurel Doctrine Works

Towns responded slowly, so the court returned to the issue in Mount Laurel II (1983). It extended the obligation to every municipality in areas the state designated for growth. It required actual fair-share numbers. It said towns should use tools such as density bonuses and mandatory set-asides, the core of inclusionary zoning. It also made the builder’s remedy broadly available. A developer who successfully challenged an exclusionary ordinance could ordinarily win approval to build, if the project included a suitable share of lower-income homes.

The legislature answered with the Fair Housing Act of 1985. It created the Council on Affordable Housing (COAH) to define housing regions, estimate regional need, and review town plans. The state Supreme Court upheld the act in 1986. In 2015, the court declared COAH inoperative, and towns went back to court to show compliance.

In March 2024, New Jersey enacted P.L.2024, c.2, which set the framework for the fourth round of obligations, covering 2025 to 2035. Under it:

• The Department of Community Affairs calculates present and prospective need for all 564 municipalities. Its October 2024 figures are non-binding guidance.
• A judiciary-run Affordable Housing Dispute Resolution Program settles disagreements.
• “Bonus credits,” which count some homes as 1.5 or 2 units, are capped at 25% of a town’s prospective need.

Why It Matters for Workforce Housing

Mount Laurel obligations cover low-income households, at or below 50% of the regional median income, and moderate-income households, between 50% and 80%. New Jersey’s labels differ from HUD’s, which uses “low income” for households up to 80% of the area median. Depending on household size and local pay, the moderate-income band can include workers such as teachers, health aides, and service employees. The doctrine is one of the longest-running U.S. examples of a statewide requirement that towns plan for their fair share of that housing. For tools other states use, see what local governments can do.