By: Sean Ghio, Policy Director
In Connecticut towns, affordable housing development debates often center on a familiar set of concerns: school costs, increased traffic, strained municipal budgets, and reduced public safety.
A new study examining large affordable housing developments built under Massachusetts’ Chapter 40B suggests that these concerns are generally baseless.
For Connecticut advocates and policymakers, the findings are especially significant because Chapter 40B is similar to Connecticut’s Affordable Housing Land Use Appeals Act, commonly known as Section 8-30g. Both laws were created to address exclusionary zoning practices and to ensure that municipalities contribute to meeting regional housing needs.
The study, Knock Knock: The Impact of Large Subsidized Housing Developments on the Surrounding Community by Sethu Odayappan, analyzed 65 large mixed-income developments built in Massachusetts communities subject to Chapter 40B. The average development contained more than 200 apartments.
The results directly challenge many of the claims that routinely surface in local opposition.
Municipal Finances Remained Strong
A common argument against affordable housing is that new residents consume more in public services than they contribute in tax revenue. The Massachusetts evidence tells a different story.
The study found no evidence that large affordable housing developments weakened municipal fiscal health. Communities experienced substantial growth in their residential tax base following project completion, while bond ratings and broader fiscal indicators remained stable. Importantly, municipalities did not need to increase property taxes on existing residents to accommodate growth.
In other words, the developments added housing and population without producing fiscal distress often predicted by opponents.
Schools Absorbed New Students
Concerns over exploding school enrollment are among the most politically potent objections to multifamily housing proposals. Other research and empirical evidence have long shown that new multifamily housing does not result in significant increases in school enrollment. In this study, while the developments did add students to local school systems, there was no measurable increase in class sizes and no evidence of declining school performance based on available indicators.
No Evidence of Rising Crime or Traffic
The study also examined two other frequent concerns: public safety and transportation impacts.
Researchers found no measurable increase in arrest rates following development. Nor did they find evidence that the new housing worsened traffic conditions when evaluating community-level indicators such as commute times and crash data.
Lessons for Connecticut
The parallels to Connecticut are clear. Like Chapter 40B, Section 8-30g was enacted because organized opposition and local zoning decisions often make it difficult or impossible to build affordable housing in communities with limited existing supply. Both statutes recognize that housing shortages are not merely local concerns; they are regional and statewide challenges.
Connecticut continues to face a severe shortage of both affordable and market-rate housing. Yet opposition to any new housing, but especially new multifamily development, frequently cites predictions of fiscal burdens, overcrowded schools, traffic congestion, and public safety concerns.
This study suggests that we can build more housing and strengthen our communities while expanding access to the homes that Connecticut residents increasingly need without these negative effects. The Massachusetts experience shows that, across dozens of communities and thousands of housing units, researchers did not find evidence that large mixed-income developments undermine municipal finances, school quality, public safety, or transportation systems.
We are left to ponder the researcher’s final question: “the findings raise a broader political economy question: why does opposition persist if large mixed-income developments do not measurably reduce municipal fiscal health or service quality?”
As Connecticut continues to grapple with a housing shortage and ongoing debates over Section 8-30g, policymakers and local officials should focus on the growing body of empirical evidence rather than longstanding unfounded assumptions.