Last updated: 9 October 2026
This text is published in several languages. In case of doubt or discrepancy between versions, the English version prevails.
CASAS.ES uses a single cookie: the one that keeps you signed in when you use your account. It does not use third-party analytics or advertising cookies or tools: no Google Analytics, no social media pixels, no ads. We do not track you across other websites or build advertising profiles.
We also store information in your browser's storage: partly so the website works and remembers your preferences, and partly to measure how our forms are used during your visit, with an in-house tool. European law treats that storage the same way as cookies, so we explain all of it here.
| Name | Purpose | Duration |
|---|---|---|
casas_sess | Keep you signed in to your account. It is only created if you sign in. It is our own cookie, cannot be read by other websites or by the page's code, and is always sent encrypted | 180 days, or until you sign out |
It is essential for using your account: without it you would have to sign in again on every page.
| Name | Purpose | Duration |
|---|---|---|
casas_uilang | Remember the language you chose | Until you delete it |
casas_mode | Remember whether you prefer light or dark mode | Until you delete it |
casas_snd | Remember whether you want the website's sounds on or off | Until you delete it |
casas_likes | Remember the properties you have «liked» | Until you delete it |
casas_reales | Remember the sale prices you have shared, so we don't ask again | Until you delete it |
enc_… | Remember your answers to «Do you know this area?», linked to the location of the area you rated | Until you delete it |
casas_eras_… | Remember which historical aerial photos exist for each municipality, to load them faster | Until you delete it |
casas_signup | Remember that you have already registered, so we don't show you the form again | Until you delete it |
casas_email | Remember your email after you register, so you don't have to type it again | Until you sign out or delete it |
casas_funnel_part | Keep the answers of a questionnaire you left half-way, so you can pick it up again | Until you delete it |
casas_funnel_dism | Remember that you closed a questionnaire, so we don't show it again straight away | Until you delete it |
casas_nl_visto | Remember which areas' weekly publication we have already told you about, so we don't show you the notice again | Until you close the tab |
casas_lgb | Remember that we have already offered you this website in your browser's language, so we don't show you the notice again | Until you delete it |
This information stays in your browser and is not used to track you across other websites. If you use a shared computer, sign out when you finish: that deletes your session and your email from that browser.
| Name | Purpose | Duration |
|---|---|---|
casas_sid | A random identifier that lets us measure how our questionnaires and forms are used during your visit (which steps are completed and where people drop off), in order to improve them | Until you close the tab |
We do this measurement ourselves, on our own servers; no third party is involved. The identifier is random, contains no data about you and is deleted when you close the tab, so it does not let us recognise you on another visit. A new one is created when you sign in, register or sign out, so what you did before signing in stays anonymous.
If you have a CASAS.ES account, while you are signed in we link your activity to your account, to improve the service. You can object at any time; we explain how in our privacy policy.
If you choose «Continue with Google» to sign in, Google may set its own cookies under its cookie policy. If you don't use that option, it is not loaded.
Aerial photos are loaded from the Spanish National Geographic Institute (a Spanish public body) when you open them.
You can delete everything CASAS.ES stores in your browser at any time from its settings (in most browsers: Settings → Privacy → Clear browsing data → «Cookies and site data»). The website will keep working: it will forget your preferences and, if you were signed in, you will need to sign in again.
Versión en español: Política de cookies · See also: Privacy · Legal notice