ImmoKnow

ImmoKnow is built for buyers, sellers, renters and small investors who search Belgian property on Immoweb and want a second opinion on price before they commit to a viewing or an offer. Once installed, the extension works as an overlay: open any Immoweb listing and it inserts a market estimate alongside the asking price, colour-coded so a potential bargain and an overpriced listing are obvious at a glance. Each estimate carries a 0–100 confidence score, the number of comparable properties used, and a note on how far the algorithm had to search geographically.

Beyond a single estimate, ImmoKnow shows the wider pricing picture — P25, median and P75 ranges for comparable properties, a live price distribution curve, price per square metre against market averages, and a measure of local price volatility. A separate rental yield module runs the buy-to-let numbers on the spot: a market rent estimate, gross and net yield, a break-even timeline in months and years, and a full cost breakdown covering notary fees, renovation, property tax, insurance and management fees. Every field in that model is editable so you can adapt it to your own financing and tax situation.

Clicking the extension icon opens a Market Explorer dashboard for Belgium where you can filter by province, property type and surface area and compare average and median sale and rent prices, price per square metre, rental yield by region and full price distributions in live charts. ImmoKnow states that its estimates draw on publicly available Belgian sources such as Statbel, FPS Finance cadastral records and the Fednot notary barometer, supplemented by data from a network of real estate professionals, refreshed roughly every two weeks. The interface supports French, Dutch and English, matching the three-language reality of the Belgian market. Note that ImmoKnow is a third-party analysis tool and its estimates are indicative rather than valuations from a certified appraiser.