New Jersey's Fourth Round of Affordable Housing (2025-2035): What Owners and Buyers Should Know

New Jersey towns are rewriting zoning ordinances in 2025 and 2026 to meet their Fourth Round affordable housing obligations. For property owners, buyers and neighbors, those changes can affect what can be built nearby, and the decisions can be challenged in court within short deadlines.

The background: Mount Laurel

Under decisions of the New Jersey Supreme Court known as the Mount Laurel doctrine, every municipality must use its zoning powers to create a realistic opportunity for its fair share of the region's affordable housing. Obligations are recalculated for ten-year "rounds." For years the process was administered by the Council on Affordable Housing (COAH) and later by the courts, producing extensive litigation.

The 2024 law and the Fourth Round

In March 2024 New Jersey enacted P.L.2024, c.2, from bills A4 and S50. The law abolished COAH, directed the Department of Community Affairs (DCA) to calculate each municipality's present and prospective need, and created the Affordable Housing Dispute Resolution Program, staffed by retired judges, to resolve challenges. The Fourth Round runs from July 1, 2025 to June 30, 2035. Municipal summaries describe other features, including bonus credits that can reduce obligations and longer affordability controls on new units.

The DCA published its calculations in October 2024. Municipalities could accept or contest them, and interested parties could challenge the municipal numbers. A June 12, 2025 order of the Superior Court for Montvale, for example, describes how a municipal planner's recommendation, challenges, and the Program's recommendation led the court to fix the borough's prospective need at 205 affordable units. Municipalities were required to file Housing Element and Fair Share Plans by June 30, 2025, and many have adopted implementing ordinances, such as overlay zones, in 2026.

Challenges by a coalition of municipalities to the new law in federal court were rejected, and press reports indicate that the U.S. Supreme Court declined to hear that case.

What it means for owners, buyers and neighbors

• Zoning may change near you. Overlay zones and rezonings can allow multifamily or inclusionary development on sites that were previously limited. Review municipal agendas and the adopted fair share plan.
• Due diligence matters. Buyers should check zoning, pending applications and recorded deed restrictions on affordable units. Our guides to New Jersey property transactions and title searches in New Jersey explain the process.
• Affordable units have rules. Deed-restricted units come with income limits and resale controls. First-time buyers can also review New Jersey's first-time homebuyer programs.

Challenging a municipal land-use decision

When a planning board or zoning board approves or denies a development application, or a governing body adopts an ordinance, the usual way to challenge it in court is an action in lieu of prerogative writs in the Superior Court, Law Division, under Rule 4:69 of the New Jersey Court Rules. These cases generally must be filed within 45 days of the decision or of publication of the notice, so timing is critical. This explanation of New Jersey's action in lieu of prerogative writs (R. 4:69) covers the standards and remedies. Disputes involving the Fourth Round obligations themselves follow the specific procedures of the 2024 law.

Why the deadlines mattered for towns

Under the 2024 law, municipalities that adopted their obligations and filed compliant plans on time receive protection from exclusionary zoning lawsuits, often called "builder's remedy" suits, in which a developer asks a court to approve a project because the town failed to meet its constitutional obligation. Missing the deadlines can expose a town to that litigation. That is one reason most municipalities moved quickly in 2025 and adopted implementing ordinances in 2026.

Affordable housing basics for buyers and renters

Affordable units created under the Mount Laurel framework are reserved for households within set income limits, generally divided into very-low-, low- and moderate-income tiers measured against the regional median income. The units carry recorded deed restrictions that control resale prices and rents for a set number of years, and buyers must qualify through the administrative agent that manages the units. Anyone buying a deed-restricted unit should read the restriction carefully, because it limits future resale price and eligible buyers. Sellers and buyers of market-rate homes nearby may also want to review how selling a house in New Jersey works.

Frequently Asked Questions

What is the Fourth Round?

The ten-year affordable housing planning period from July 1, 2025 to June 30, 2035 under New Jersey's Mount Laurel framework.

Who decided each town's number?

The Department of Community Affairs calculated obligations; disputes went to the Affordable Housing Dispute Resolution Program and the Superior Court.

How long do I have to challenge a zoning board decision?

Generally 45 days under Rule 4:69-6, measured from the relevant notice or decision. Consult a New Jersey land-use lawyer immediately.