Guyancourt Property Prices, Rents & Rental Yields

About Guyancourt

Guyancourt sits in the Yvelines department as a well-connected suburban city with a strong everyday rhythm, shaped by residential districts, green spaces, and its links to the wider Saint-Quentin-en-Yvelines area. For apartment investors, it offers a location where local housing trends matter as much as the broader regional setting.

August 2026 brings the clearest signal: pricing remains under mild pressure while rents continue to edge higher. The average apartment sale price stands at €264,000, after falling 0.9% over the month and 1.7% over the year. At the same time, the average rent has reached €940, up 5.3% month over month and 4.0% year over year, which helps support a 6.23% yield.

That combination creates a familiar investment tension. The average price per square metre now sits at €3,810, down 2.6% from the previous month and 2.3% below a year earlier, suggesting entry values have softened even as rental levels move higher. For buyers focused on apartments, the August reading points to a market where income is improving faster than capital values, but where the margin still depends on disciplined acquisition pricing and a close reading of local rent growth.