Guyancourt Property Prices, Rents & Rental Yields

About Guyancourt

Guyancourt is a city in France’s Yvelines department, giving its apartment market a defined local frame rather than a department-wide one. That distinction matters for an investment location page: these figures describe apartments in Guyancourt, not every property or municipality around it.

In October 2026, the clearest signal is the sharper retreat in rents than in sale prices. Average apartment rent is down 17.5% year on year, while the average sale price is down 3.9% over the same period. This is the central tension for investors: lower purchase pricing does not, on its own, offset a steeper fall in rental pricing. Guyancourt’s stated yield of 8.67% therefore deserves to be read alongside the direction of rents, rather than treated as a stand-alone verdict on a potential purchase.

At €770, the current average rent provides a reference point for assessing an individual apartment, but it is an area average, not a promise of income from any particular unit. Likewise, the reported yield is a market indicator, not a forecast of what an investor will receive after property-specific costs. For an October assessment, the practical question is whether a proposed purchase price and a realistic rent estimate still work together when rental prices have fallen faster than sale prices. The supplied figures establish that contrast; they do not show how it varies by apartment or whether the recent direction will continue.