Privacy

Last updated 2 November 2026.

Housewizz is a browser extension and website based in the UK. Questions about your data, or requests to see or delete it: hello@housewizz.com.

Housewizz runs in your browser. It never sends us your browsing history, your searches or the homes you save.

Stored on your device (browser storage): prices and sale statuses it has seen on listings you viewed, any EPC certificate you chose with "Not this home?", and your settings, including mortgage figures you enter. Removing the extension deletes all of it.

Shared address corrections. When you use "Not this home?" to pick the right EPC certificate for a listing, that pick is sent to the Housewizz server: the listing ID, its postcode, the certificate you chose (or "none of these"), the one we had guessed, and a few listing details the matcher used (floor area, rating, house type, date listed). It is tied to a random ID created for your install, never your name, email or browsing. When two or more people agree, other users see that address as "Confirmed by buyers".

If you sign up as a founding member, on the website or in the extension, we keep your email address, your first name if you give it, your invite code, the code of the friend who invited you (if any), and when you agreed to be emailed. We use this only to run your membership and to email you about Housewizz, which you agree to when you sign up. We don't sell it or share it. You can unsubscribe from any email, and ask us to delete your membership at any time.

Where it's kept. The Housewizz server and database run on Cloudflare, in Western Europe. Cloudflare processes this data on our behalf and doesn't use it for anything else.

Requests the extension makes while you browse, only to look things up for the listing or area you are viewing:

• Rightmove, Zoopla and OnTheMarket (the same site you are on) for listing details
• HM Land Registry (sold prices), the government EPC register, postcodes.io, planning.data.gov.uk, PlanIt, data.police.uk, the Environment Agency (flood data) and OpenStreetMap (schools)

These services receive the postcode or location being looked up, as any website you visited would. No personal details are sent.

The website doesn't use cookies, analytics or tracking. Its example photo is loaded from Unsplash. If you sign up, it remembers your invite link in your browser so it can show it again.

Your rights. Under UK data protection law you can ask to see, correct or delete the data we hold about you, or object to how we use it. Email hello@housewizz.com. You can also complain to the Information Commissioner's Office (ico.org.uk).

Housewizz is not affiliated with Rightmove, Zoopla or OnTheMarket. Sold prices are HM Land Registry Price Paid Data (Open Government Licence v3.0). The negotiation signal is a summary of public data (days listed, price cuts seen, recent sold prices nearby). It is not advice and says nothing certain about what a seller will accept.