Buying an apartment for €2,500 per square meter in the Île-de-France region, in a city soon to be connected to the metro? It’s still possible. As the Grand Paris Express approaches its first openings, several municipalities that have long been underserved could see their status change in the real estate market.
As for the schedule, Line 18 is set to welcome its first passengers in December 2026, running between Massy-Palaiseau and the Saclay Plateau. Line 15 South will follow in the fall of 2027, before the gradual rollout of Lines 16 and 17 starting in 2028. In total, the Grand Paris Express will consist of 200 kilometers of lines and 68 stations, with one goal: to enable residents of the Île-de-France region to reach major employment hubs without having to systematically cross Paris.
Here are the cities in the Île-de-France region that will soon be connected to the Paris metro
It is in Clichy-sous-Bois and Montfermeil, in Seine-Saint-Denis, that the gap between real estate prices and future transportation options is particularly striking. According to SeLoger-MeilleursAgents data from September 2026, an apartment costs an average of €2,037 per square meter in Clichy-sous-Bois, compared to €2,919 in Montfermeil. Both cities will share a station on Line 16, which is now scheduled to open in 2029. The metro will provide access to Saint-Denis Pleyel and its connections to Line 14.
In Val-de-Marne, Champigny-sur-Marne already features suburban neighborhoods, the banks of the Marne River, and close proximity to Saint-Maur-des-Fossés. The future Champigny Centre station, on Line 15 South, is set to open as early as 2027. With average prices of just over €3,700 per square meter for apartments, Champigny remains less expensive than several neighboring towns.
Starting in December, the first section of Line 18 is set to connect Massy-Palaiseau to Christ de Saclay, passing through the university districts on the plateau. For employees and students, this offers a new alternative to buses and cars. In terms of real estate, prices in Palaiseau have already surpassed €4,000 per square meter for an apartment, driven in particular by the presence of prestigious universities, research laboratories, and local businesses.
Other towns will primarily gain new connections. Noisy-le-Grand and Champs-sur-Marne will welcome Line 15 South at Noisy-Champs in 2027, followed by Line 16 in 2029. To the west, Clamart, Bagneux, and Châtillon will also benefit from Line 15 South. Later, in 2030, Line 18 is scheduled to reach Guyancourt and Versailles, while the eastern and western sections of Line 15 will complete the major ring line in 2031.
But does that mean you should rush to buy near a future station? Not necessarily. The Notaires du Grand Paris have not observed a systematic rise in prices around the announced stations.
For homebuyers, the main change could therefore lie elsewhere: the ability to live in a town that remains accessible while significantly expanding the range of places where they can work and study.