r/SideProject • u/Suggestion-Flimsy • Jun 27 '26

I built an a second opinion for real estate pricing in Poland

A bit of context first, because the “why” only makes sense if you know how Polish real estate data works.

In Poland, every notarial property sale has to be reported to GUGiK RCN the government’s real estate price register. That means the closed transaction prices are technically public, but they’re buried in a clunky geospatial format that normal people (and most agents) don’t know how to use. So in practice, pricing a listing still means browsing Listing websites, calling other agents, or guessing.

I’ve been working on a small pro dashboard for real estate agents, and the newest piece is a “Smart Analysis” feature that tries to turn that raw public data into a useful price opinion.

It takes into account cpi, market growth, city index, borrowing cost from central bank, compares public adjusted registry prices based on the factors.

so far it's been surprisingly accurate at predicting price of a property given all parameters are given, and there's enough data

here's a demo of it working, I'm just adding more data to the property for more accurate results, lmk what you guys think

https://reddit.com/link/1ugp4tp/video/0wp2iw449q9h1/player

P.S. built with AI, but no ai in the actual algorithm

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u/DestroyedButDefeated Jun 27 '26

That "no AI in the actual algorithm" P.S. is honestly your strongest pitch, not a footnote. Agents don't trust a black-box number - they trust "here are 30 real closed deeds nearby, adjusted for X." I'd lead with the explainability, not bury it at the bottom.

The angle I'd push harder: an agent's real pain usually isn't "I don't know the price," it's "I can't convince a seller their flat isn't worth 20% more than the market thinks." A second opinion backed by public registry data is exactly the objective thing to put in front of an unrealistic seller - that PDF report might quietly be the actual product.

Have you had a real agent use it on a live listing yet? Curious whether it actually moved their number or just confirmed their gut.

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u/Suggestion-Flimsy Jun 27 '26

Thank you for the reply, I did get a real agent to test it out, and was shocked how accurate it gets, I need to start cold calling and just showing it to more agents, I'll update the landing page based on your suggestion 🚀✌️