Paris is the first city in France to implement some form of residential rent control. The first came in 2014 (enacted in the market in 2015), but this was later removed in 2017. The second came in 2019, and this current program remains in place until November 2026, at which time it will be reviewed.

But given that it has already been in place for a number of years, people have started to analyze it's effectiveness. Here is a study by Atelier Parisien d'Urbanisme (APUR) that was published this month.

The report is in French, but I can tell you that, what they did, was compare the Paris region to 8 other cities in France -- all of which do not have the same rent controls. They were: Aix-en-Provence, Grenoble, Marseille, Nantes, Nice, Strasbourg, Toulon, et Toulouse. These were allegedly chosen because their housing markets are thought to be similar to that of Paris'.

What they found was that from July 2019 to July 2023, legislated controls in Paris lowered rents by approximately 4.2%, compared to where they would have been without any market intervention.

At the same time, they noticed that these same controls seemed to become more effective over time. From July 2019 to June 2020, they lowered rents by 2.5%, but from July 2022 to June 2023, they lowered rents by 5.9%.

Finally, they also found that the controls seemed to impact smaller places the most. For apartments between 8 and 18 m2, rents were 10.2% lower than expected during July 2019 and July 2023.

This is all interesting stuff, but in many ways, it is expected. Rent controls are intended to depress rental growth. That's the whole point. And based on this data from APUR, it is working in Paris.

But the really tough questions pertain to the possible knock-on effects. If rents are 4.2% lower, but operating costs are now growing faster than rents, then this is a problem for the housing market. You're on an unsustainable path.

And if lower rents mean that fewer developers are going to build new housing, then this is also a problem, because less supply will eventually translate into more upward pressure on rents. I don't know for sure that this is happening in Paris, right now, but these are crucial considerations.

It's never as simple as just looking at rents and thinking lower is better for long-term affordability.