Cologne short‑term lets 2026: Wohnraum‑ID, 90‑day cap, €500k fines

What changed, and when

North Rhine‑Westphalia’s Wohnraumstärkungsgesetz (WohnStG NRW) created a uniform framework for cities to regulate short‑term letting. Cologne implemented this by requiring a Wohnraum‑Identitätsnummer (Wohnraum‑ID, also called Wohnraum‑Identitätsnummer or WIN) before any advertising of a short‑term let. The state portal confirms that the registration duty in Cologne started on 1 July 2022. Brühl joined in 2026; other listed NRW cities include Aachen, Bonn, Dortmund, Düsseldorf, Münster and Wesseling. Hosts must display the Wohnraum‑ID in every listing or printed advert. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

A 90‑day annual cap applies to short‑term letting of a dwelling without a special permit. Student tenants can reach up to 180 days if they provide extra documents to the city. Cologne’s website and the NRW portal both set out these thresholds. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

From 1 July 2026, the state portal says online platforms (for example Airbnb or Booking) must transmit activity data to the municipality where the dwelling is located. At the same time, the previous obligation for hosts to keep an occupancy log ends for bookings mediated by such platforms. For other channels (e.g., small ads or social media), hosts must still report occupancies to the city. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

Cologne’s own “Wohnraumschutz und Zweckentfremdungsverbot” pages note the city’s framework is in force and was updated and extended in July 2026. ([stadt-koeln.de](https://www.stadt-koeln.de/artikel/62031/index.html?utm_source=openai))'}},{

Who needs a Wohnraum‑ID, and for what

• You need a Wohnraum‑ID for each separate dwelling you intend to short‑term let, even if you only let one room of your primary residence. The ID is issued for the whole apartment and must be shown in every advert. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

• The duty applies whether the space is paid or free; the law does not distinguish between compensated and uncompensated lets. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

• The 90‑day cap attaches to the dwelling, not to each household member. In a shared household you cannot multiply the allowance by the number of occupants. For WGs, each person may register their own room up to the stated limit; for student WGs the per‑person room limit can be up to 180 days with documentation. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

• If you intend to exceed 90 days in a calendar year, you must seek a Zweckentfremdungsgenehmigung (misuse/short‑let permit). Cologne states that the minimum fee for such an application is €500. The state portal gives an NRW‑wide fee range of €500 to €2,500, with €500 typical. Permits are discretionary and are not guaranteed. ([stadt-koeln.de](https://www.stadt-koeln.de/artikel/72028/index.html?utm_source=openai))

How and where to apply: what you must file before listing

Apply online via the state portal “Bauportal.NRW” under Wohnraum‑ID. You need to register the dwelling before advertising; the ID is created immediately and free of charge for up to 90 days of letting per calendar year (or up to 180 days for students once approved). ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

The law sets out the core data you must file with the municipality to obtain the Wohnraum‑ID: surname, first name, address, date of birth, the dwelling’s location, whether it is a main or secondary residence, and the intended distribution channel for the short‑term letting. Cologne confirms that hosts must display the ID in every advert; platforms can be ordered to remove non‑compliant listings. ([recht.nrw.de](https://recht.nrw.de/system/files/pdf/law-and-ordinance-gazette/2021/06/23/934d0c/gesetz-zur-staerkung-des-wohnungswesens-in-nordrhe.pdf?utm_source=openai))

If you plan to operate beyond 90 days or to convert a flat into a dedicated holiday apartment, expect two tracks: (1) a Zweckentfremdungsgenehmigung under the city’s Wohnraumschutzsatzung and WohnStG NRW, and (2) in many cases a separate change‑of‑use permit (Nutzungsänderung) under building law. Cologne’s building authority provides the change‑of‑use application route and explains when a full building permit is required. Consult a local architect or bauvorlageberechtigte designer for this step. ([stadt-koeln.de](https://www.stadt-koeln.de/artikel/62031/index.html?utm_source=openai))

Enforcement: fines, platform duties, and common pitfalls

Cologne cites fines up to €500,000 for violations under § 21 WohnStG NRW. The ministry’s guidance and the published law confirm this ceiling. Offences include failing to state the Wohnraum‑ID, giving a false or invalid ID, or breaching a municipal order under the statute. ([stadt-koeln.de](https://www.stadt-koeln.de/artikel/62031/index.html?utm_source=openai))

From 1 July 2026, platforms must transmit activity data to cities that have a registration duty. That means the municipality can cross‑check adverts, Wohnraum‑IDs and booking data. Expect faster delistings where numbers are missing or inconsistent. Cologne notes it can instruct platforms to remove listings or block access. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

Two frequent mistakes: (1) advertising before obtaining the Wohnraum‑ID, and (2) assuming the 90‑day allowance is per person, not per dwelling. Both trigger enforcement risk. The state portal is explicit that the 90‑day limit is per dwelling and that the ID must appear in every advert. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

Don’t forget Cologne’s culture tax

Cologne levies a culture tax (Übernachtungssteuer/Kulturförderabgabe) on paid short‑term stays. The city sets the rate at 5% of the price paid for accommodation, with detailed rules, exemptions and record‑keeping duties. In particular, hosts must retain copies of the guest’s ID and signed exemption declaration where applicable, per the city’s guidance and the 2024 consolidated statute. This sits alongside WohnStG NRW obligations and applies to private flats and holiday apartments. ([stadt-koeln.de](https://www.stadt-koeln.de/service/produkte/01051/index.html?cnw_autotranslate=ro&utm_source=openai))

Buyers’ checklist: before you plan to list

• Budget time to apply for your own Wohnraum‑ID via the NRW portal; do not assume a seller’s prior number will suffice. You must obtain and display the ID before advertising. ([bauportal.nrw](https://bauportal.nrw/wohnraum-id))

• If your business model needs more than 90 days per year, factor in a discretionary Zweckentfremdung permit, with Cologne citing a minimum €500 fee and the NRW portal indicating a €500–€2,500 range. ([stadt-koeln.de](https://www.stadt-koeln.de/artikel/72028/index.html?utm_source=openai))

• If you are converting a flat to a dedicated holiday unit, check building‑law requirements for a change‑of‑use permit with the Cologne building authority. This is separate from the Wohnraum‑ID and may be decisive for feasibility. ([stadt-koeln.de](https://www.stadt-koeln.de/service/produkte/00135/index.html?utm_source=openai))

• Build compliance with Cologne’s culture tax into your workflow from day one (rate 5%, documentation and filing rules). Consider whether your platform collects/remits or whether you remain the taxpayer. When in doubt, ask a local Steuerberater. ([stadt-koeln.de](https://www.stadt-koeln.de/service/produkte/01051/index.html?cnw_autotranslate=ro&utm_source=openai))

This article is an overview, not legal or tax advice. For permits, contact the Amt für Wohnungswesen and the Bauaufsicht. For taxes, consult a Steuerberater experienced in Cologne’s Kulturförderabgabe and cross‑border issues. For building permits, engage a bauvorlageberechtigte architect.