In a new policy report, Guillaume Chapelle analyzes the spread and economic effects of apartment certification in the French private housing market. Using an original dataset combining information on apartment certifications, real estate transactions, and land registry data, the paper shows that certification—once mainly associated with social housing—now covers nearly half of newly built private apartments. Hedonic pricing estimates indicate that certified new units sell for about 2% more than comparable non-certified dwellings and are resold at roughly 4% higher prices, suggesting lower depreciation over time.