Investment Property in Troisdorf: Numbers, Locations, and an Honest Calculation

It depends on the individual apartment. Troisdorf has very low vacancy and stable demand. At €2,400/m² and index rent, the gross yield is about 3.9%. With financing, you'll often pay extra monthly—about €150 after taxes in our example.

Yes. Troisdorf is in the NRW ordinance; the rent brake applies until Dec 31, 2029. New leases may not exceed the local comparative rent by more than 10%. A 15% cap over three years also applies until Feb 28, 2030.

Gross approx. 3.5% to 4.5% for an older apartment (41–80 m²) at a €2,400/m² median, depending on whether you use the census average, the rent index (€7.89/m²), or the expert committee's yield factor.

According to the expert committee, 41–80 m² apartments in 2024/25 cost a median of €2,400/m² (built up to 1980), €2,750/m² (1981–1995), and €5,000/m² (from 2011). The average price of all apartments sold in 2025 was €242,000.

The 2025 qualified rent index specifies a base rent of €7.89/m² for a 60 m² apartment. Surcharges apply for build year, location, and features, e.g., +€2.93/m² for build years 2021–2024.

Most apartments are in Mitte, Spich, Sieglar, and Friedrich-Wilhelms-Hütte. Mitte and Spich are great for commuters; Sieglar or Bergheim for families. The rent index only distinguishes between 'normal' and 'good' locations by street.

NRW charges 6.5% transfer tax. Notary and land registry with financing are about 2%. Without a broker, costs for a €144,000 price are about €12,180 (approx. 8.5%).