Cologne's Rent Cap: 10 Percent Above a Mietspiegel That Isn't 'Qualified'
Cologne's entire city area is designated a tight housing market, so the federal Mietpreisbremse (BGB Sections 556d-556g) applies: a new lease generally cannot charge more than 10 percent above the local comparable rent, which is determined using Cologne's own Mietspiegel. The current Mietspiegel was published with April 2025 data and, according to Stadt Köln's own participation in producing it, is a simple Mietspiegel under Section 558c BGB, not a qualified one under Section 558d, a real distinction that affects how much legal weight it carries in a dispute. As of Q1 2026, average rent citywide runs about 13.14 EUR per square meter, up roughly 4.95 percent year over year, reaching as high as 15.96 EUR per square meter in the city center. The cap doesn't apply to new buildings first rented after October 1, 2014, extensively renovated units, or cases where the previous tenant already paid more. Cologne's rent cap designation runs through the end of 2029.
The Official Rule
Cologne’s entire city area is designated a tight housing market (angespannter Wohnungsmarkt), which means the federal Mietpreisbremse applies, established under BGB Sections 556d through 556g, and in effect nationally since June 1, 2015. In practice: for a genuinely new lease on an existing unit, rent generally cannot exceed 10 percent above the local comparable rent.
Cologne’s designation as a rent-cap area currently runs through the end of 2029.
The Mietspiegel Nuance Worth Knowing
The comparable rent figure that anchors the 10 percent calculation comes from Cologne’s Mietspiegel, most recently published with April 2025 data, produced with participation from the city, tenant associations, and landlord associations, according to Stadt Köln’s own press release on the process.
Here’s the detail worth flagging clearly: Cologne’s Mietspiegel is officially a simple Mietspiegel under Section 558c BGB, not a qualified Mietspiegel under Section 558d. That’s a genuine legal distinction. A qualified Mietspiegel is built to recognized scientific standards and, in a court dispute, generally carries a presumption of accuracy that shifts more of the burden of proof. A simple Mietspiegel still functions as the recognized reference point for the rent cap calculation day to day, but carries somewhat less automatic legal weight if the figures themselves are contested in court.
How the Cap Is Calculated
| Step | Figure |
|---|---|
| Mietspiegel comparable rent | 11.40 EUR/sqm |
| Maximum allowed (x1.10) | 12.54 EUR/sqm |
This example, from third-party guidance on Cologne’s rent cap, illustrates the mechanic: find the Mietspiegel entry matching your apartment’s size, construction era, and location, then the legal ceiling is that figure times 1.10, for a genuine new lease.
Photo by Phát Trương on Pexels
Where the Cap Doesn’t Apply
| Exception | Condition |
|---|---|
| New construction | First used and rented after October 1, 2014 |
| Extensive modernization | Investment at least one-third of comparable new-construction cost, exempt on first post-renovation rental |
| Vormiete (previous tenant's rent) | If the prior tenant already legally paid above the cap, landlord may continue charging it, documentation required if challenged |
What Rent Actually Looks Like Right Now
As of the first quarter of 2026, figures tracking Cologne’s rental market put the citywide average around 13.14 EUR per square meter, up roughly 4.95 percent compared to the same period in 2025, with the city center reaching as high as 15.96 EUR per square meter. Treat these as general market context rather than your specific legal ceiling, the number that actually governs your lease is the Mietspiegel entry matching your unit’s characteristics, not the citywide average.
Step by Step
- Confirm you’re signing a genuinely new lease, not continuing an existing tenancy, since the cap specifically governs new leases.
- Check whether an exception applies: is the building new construction post-October 2014, extensively renovated, or is there a documented Vormiete above the cap?
- Find the Mietspiegel entry matching your unit’s size, age, and location, this is your baseline comparable rent.
- Calculate the ceiling: comparable rent multiplied by 1.10.
- Compare your actual offered rent against that ceiling.
- If it looks too high and no exception clearly applies, request the previous tenant’s rent in writing from your landlord, and consider consulting a Mieterverein or Mietrecht lawyer for a formal assessment.
Compliance Note
This page explains general practice around Cologne’s rent cap, but it is not legal advice, and specific calculations depend on details unique to each lease and unit. For your specific situation, consult Cologne’s Mietspiegel directly, a tenant association, or a lawyer specializing in Mietrecht.
FAQ & Common Pitfalls
What does it actually mean that Cologne's Mietspiegel is "simple" rather than "qualified"?
It's a real legal distinction, not just a technical label. A qualified Mietspiegel (Section 558d BGB) is produced according to recognized scientific standards and, once challenged in court, generally enjoys a presumption of accuracy, shifting more of the burden of proof. A simple Mietspiegel (Section 558c BGB), which is what Cologne currently has, still serves as a recognized reference point for comparable rent, but carries somewhat less automatic legal weight if a landlord or tenant disputes the figures in court. Practically, it still functions as the baseline for calculating the 10 percent cap, but it's worth knowing the difference exists.
How is the maximum allowed rent actually calculated?
Take the Mietspiegel's comparable rent figure for a unit matching your apartment's size, age, and location, then add at most 10 percent. Third-party guidance on Cologne's rent cap gives a concrete example: a mid-tier apartment from 1975 at 75 square meters with a Mietspiegel value of 11.40 EUR per square meter allows a maximum rent of 12.54 EUR per square meter (11.40 multiplied by 1.10), once you're renting a genuinely new lease rather than continuing an existing one.
Which apartments are exempt from the cap entirely?
Three categories. First, units first used and rented after October 1, 2014, are exempt as new construction. Second, units that underwent extensive modernization, where the investment corresponds to at least one-third of the cost of comparable new construction, are exempt for their first rental after the renovation. Third, if the previous tenant was already legally paying above the cap (Vormiete), the landlord can generally continue charging that higher amount to a new tenant, as long as they can document it if asked.
What's the actual average rent in Cologne right now?
As of the first quarter of 2026, average rent across the city runs roughly 13.14 EUR per square meter, an increase of about 4.95 percent compared to the same period in 2025. The city center commands the highest per-square-meter prices, reaching as high as 15.96 EUR per square meter. These are averages, actual comparable rent for your specific unit depends on the Mietspiegel entry matching its size, age, condition, and neighborhood, not the citywide average.
How long is Cologne's rent cap designation in effect?
Through the end of 2029. The federal Mietpreisbremse itself has applied nationally since June 1, 2015, under BGB Sections 556d through 556g, but individual cities and states have to be specifically designated as tight housing markets for it to apply locally, and that designation is periodically renewed or extended. Cologne's current designation runs through 2029, worth checking again as that date approaches in case it's extended further or allowed to lapse.
If I think I'm being overcharged, what should I actually do?
Start by requesting the previous tenant's rent (Vormiete) from your landlord in writing, since a legitimate exception based on Vormiete requires the landlord to be able to document it if challenged. Then compare your rent against the relevant Mietspiegel entry for a unit matching your apartment's characteristics. If the gap looks like it exceeds 10 percent without a documented exception applying, this is the kind of dispute a tenant association (Mieterverein) or a lawyer specializing in Mietrecht can formally assess, since the exact calculation depends on details specific to your lease.