Transparency

How we grade a home

Every number on this site comes from a rule you can read here, applied to public data you can check, plus what the listing itself says. Nothing is a vibe. Where we do not know something, we say so, and we say what the better source would be. If you spot a gap we have missed, tell us.

What we measure, and why

Everything here is about exposure: what a guest breathes, touches and sleeps next to. Nine things about the area around the home, then two things about the building itself. Each area component gets a score from 0 to 100, with the weight shown next to it. The weights say how much each one counts in the overall area score.

The home itself

What passes, what fails, what the letter means

By country

The rules are the same everywhere. The data underneath is not. For each region we list the sources actually wired in today and the better sources we have not reached yet. This list is our own to-do list, kept in public.

Things we want you to know

• We have not visited these homes. The grade is computed from public maps and climate models and from the listing's own words. It is a screen, not an inspection.
• Airbnb moves every pin a few hundred metres for privacy. Area scores for Airbnb homes are computed at that moved point. When a host gives us the address we use the real one.
• A home that does not mention heating, glazing or paint is scored as unknown, not as bad. Unknowns become the questions we suggest you ask the host.
• We never publish a negative claim about a named home. Homes that fail are simply not here.
• The data is refreshed daily. A home can pass one day and not the next if a listing changes, and the site says when the data was last built.
• Some booking links may earn us a referral commission. It does not change what passes.