Warren County Housing Market, Year-End 2025

Warren County continues to show the largest percentage swings of the three counties, largely because it operates on a smaller transaction base.

Throughout 2025, unsold inventory frequently ranged between roughly 200 and 280 units, while contract sales moved sharply month to month, producing noticeable volatility in demand ratios. Months of supply consistently ran higher than Morris and Sussex, often between 1.8 and 2.3 months, with periodic spikes above that range. These shifts do not indicate broad weakness. They indicate sensitivity.

Countywide averages mask significant divergence. Some municipalities clear efficiently, while others stall for extended periods. In Warren County, underwriting accuracy and micro-location matter more than any countywide metric. For asset managers, Warren is not forgiving. Deals work here when assumptions are conservative and localized. We saw it play out this year. We had a property in Hackettstown walkable location, condition was solid, priced right. It moved quickly, multiple showings, and serious interest in the first week. Then another asset, just across the river in Phillipsburg, sat. Similar pricing, even slightly better square footage. But the block was mixed, demand was softer, and absorption lagged by weeks, not days.

It wasn’t the price. It wasn’t the house. It was the township.

These are the gaps that matter — and in Warren County, they’re often the difference between closing clean and carrying too long.

IN DEPTH ANALYSIS:

Warren County continues to show the greatest volatility of the three counties, largely because it operates on a much smaller transaction base.

During 2025, unsold inventory generally ranged between approximately 200 and 280 active listings. Contract sales moved sharply from month to month, producing noticeable swings in demand ratios and months of supply. Those supply levels frequently landed between roughly 1.8 and 2.3 months, with periodic spikes above that range.

These movements are structural, not symptomatic.

In a market this size, small changes in buyer activity create large percentage shifts. That makes countywide averages less useful and municipal-level data far more important. Some townships continue to clear inventory efficiently, while others experience prolonged absorption. Two properties priced similarly but located in different municipalities can have materially different outcomes.

This is why Warren County demands conservative assumptions and precise local knowledge. Broad strategies tend to underperform here.

For asset managers, success in Warren comes from understanding hyper-local demand, setting realistic pricing expectations, and planning for longer hold periods when needed. This is not a forgiving market for generalized underwriting.