From The Wall Street Journal:
Published last month in the Journal of the American Medical Association’s Open Network, the study explored the relationship between home improvement grants and street crime in Philadelphia. It found a tight link between municipally funded house repairs and a drop in crime on those blocks with a city-funded overhauled home.
The streets of many of Philadelphia’s older neighborhoods are lined with graceful, colorfully painted Victorian row houses. But with more than 23% of the city’s residents living in poverty, many of these architectural gems have been showing the wear-and-tear of neglect for decades. Since 1995 the city government has been offering home-repair grants—up to $20,000 to low-income homeowners—to assist with costly maintenance jobs.
To find out, the research team merged data from 19,869 city blocks with each block’s crime data, focusing on the years from 2006 to 2013.
The results showed that blocks with a single house repair subsequently had a 21.9% reduction in crime compared with blocks with houses on the waiting list. Additional houses repaired on a block were linked with further drops in crime—up to a maximum of four houses, after which the curve flattened.
This was an observational study, so it remains unclear exactly why fixing the plumbing or roof of a home might lead to fewer homicides or thefts on that block. But Dr. Eugenia South, an assistant professor of emergency medicine at the University of Pennsylvania and the study’s lead author, has some ideas.