Privacy

There are no accounts on this site, nothing to sign up for, and no advertising. This page describes what actually happens when you use it, including the one place where your data leaves our control.

Addresses you type into the lot checker

We do not log them. When you check a parcel, the address is sent to our server, which forwards it to King County’s public parcel and geocoding services and to your city’s public zoning layer, then returns the result to you. We keep no record of the address, the parcel number, or the coordinates.

The address is deliberately kept out of the URL. Going from the homepage search to the lot checker hands it over in your browser’s sessionStorage, which we read once and immediately clear; it never reaches your browser history, our access logs, or the Referer header of anything the page loads afterwards. Both the lookup and the address autocomplete are POST requests, and the autocomplete response is marked no-store so no cache holds a copy.

The exception, stated plainly: King County and your city do receive the address, because that is the only way to look up a parcel. Those are public agencies operating their own services under their own policies, and we have no control over what they log. If that matters to you, use the official parcel viewer links on each city page instead — same data, one fewer intermediary.

Analytics

We use Vercel Web Analytics, which is cookieless and does not build a profile of you or follow you across sites. It records the page path, and coarse information such as country, browser, and referring site, in aggregate.

One custom event fires when a parcel lookup completes. It carries the city, whether the zone check passed, and how many rules resolved — never the address, the parcel number, or the coordinates. It exists so we can tell whether the tool is producing determined answers or unknowns, which is a question about our data quality rather than about you.

Cookies

We set none. No consent banner appears because there is nothing to consent to.

Third parties your browser contacts

• Vercel — hosts this site, and like any web host keeps standard server logs including IP addresses.
• Google Fonts — the typefaces are loaded from Google’s servers, so your browser makes a request to them and they see your IP address.
• King County and city GIS services — only when you use the lot checker, as described above.

That is the complete list. There are no advertising networks, tag managers, session recorders, heatmaps, or social tracking pixels on this site.

The data we publish

Everything in the corpus comes from public municipal code and adopted ordinances. It contains no personal information, and it is published openly at /data under CC BY 4.0. Property records referenced by the lot checker are public county records, retrieved live and not stored by us.

Changes to this page

If what we collect changes, this page changes with it and the change is logged in the changelog, same as any other correction. Questions go to contact.

ADU Ledger is maintained by Ron Diver. Not legal advice.