Cookies and browser storage
Updated: 20 October 2026
Your choice
You can use this website and its contact form without visitor statistics or ad measurement. Optional services load only with your permission. You can choose visitor statistics and Google Ads measurement separately when ad measurement is configured. You can change your choice through Cookie settings in the footer at any time.
Local browser storage
Your privacy choice is saved as cookie-consent in local browser storage, including permitted categories, a version and a timestamp. We ask again after 180 days. You can also delete the entry through your browser website-data settings.
Language preference
The necessary session cookie NEXT_LOCALE remembers the current language, German or English. It does not contain an advertising or analytics identifier.
Protected preview access
For password-protected previews, signing in sets the necessary cll_access cookie. It enables preview access and is not used for advertising or analytics.
Optional analytics with Microsoft Clarity
With your permission, a sanitised visit source is retained in session storage for up to 30 minutes and enquiry steps are measured. We load Microsoft Clarity for visitor statistics, heatmaps and session replays. Clarity may set the analytics cookies _clck (up to one year) and _clsk (up to one day). Advertising storage is not permitted. Clarity is not loaded without consent; withdrawing consent clears these first-party Clarity cookies and reloads the page to end recording. See our privacy policy for further details.
Optional ad measurement with Google Ads
With separate permission, Google Ads may use first-party cookies such as _gcl_aw and _gcl_au to attribute accepted enquiries to ad clicks, generally for up to 90 days. Google may also retain click information in local storage under _gcl_ls; we clear this entry on withdrawal too. A random enquiry identifier in session storage prevents repeated measurement events within the same tab; we retain at most the last 100 identifiers there. Without consent, the Google tag is not loaded. Withdrawal clears these first-party advertising cookies and identifiers and reloads the page. Personalized advertising and enhanced conversions are disabled.