SB Statistics — The science of housing slimbieden.nl

Independent research unit of SlimBieden

Understanding the Dutch housing market through data

We study how homes are valued, bought and financed in the Netherlands. Our research combines academic methods with detailed transaction data to better understand how the housing market works.

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Homes with solar panels in Hoef en Haag, photographed by Rico Nederveen

What is SB Statistics?

SB Statistics is the research unit of SlimBieden, a Dutch service that helps home buyers make informed bidding decisions.

Through SlimBieden, we have access to a large database of housing transactions. We use this data to investigate questions about the housing market, from how homes are valued to how buyers, sellers and lenders make decisions.

While SlimBieden provides the data, the research agenda and conclusions are determined independently by SB Statistics. This allows us to study questions on their own merits, regardless of whether the findings support existing practices or challenge them.

Independent research

Research topics are selected by our researchers. We focus on questions that matter for understanding the housing market, buyers, lenders and policymakers.

Academic standards

We use established research methods and document our work so that results can be evaluated and reproduced.

Open publication

We publish our findings, including results that may be unexpected or critical of existing practices. Each publication describes its data, methodology and limitations.

Latest research

Cover of Copying Transaction Prices

Research paper · SB–2026–01/I

Copying Transaction Prices: How Dutch Housing Appraisals Track Idiosyncratic Variation

Ramon F. A. de Punder · Mathijs R. G. Dijkstra

· 60 pages

An appraisal is meant to provide an independent estimate of a property's value. But how independent is that estimate when the transaction price is already known?

We investigate how Dutch housing appraisals relate to the prices buyers actually pay. Our findings show that appraisals closely follow transaction prices, including price differences that are specific to individual buyers and transactions.

In 41.5% of cases, the appraisal equals the transaction price, up to rounding. More broadly, appraisals reflect around four fifths of the difference between a transaction price and its expected value.

These findings raise questions about the independence of property valuations and the risks this may create for both borrowers and lenders.

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Video summary

A short animated introduction to the paper and its main findings.Only available in Dutch · 2:47

About SlimBieden

SlimBieden is a Dutch company that gives homebuyers data-driven advice on how much to bid.

Its statistical model uses more than 5.8 million transactions from the Dutch Land Registry to estimate the probability of winning with a given bid. This gives buyers a better understanding of how much they need to offer, without necessarily paying more than necessary.

The transaction data behind SlimBieden also provides the foundation for SB Statistics' research. We use this data to investigate broader questions about the housing market, while retaining control over our own research questions, methods and conclusions.

The two organisations share a founder and access to the same data, but have different purposes: SlimBieden helps individual buyers make decisions; SB Statistics studies the housing market.

Visit slimbieden.nl
Page from a SlimBieden report showing the probability of winning per bid

A SlimBieden report showing the estimated probability of winning at different bid amounts, including the uncertainty around each estimate. (PDF, 15 pages; also available ).

Contact

Ramon de Punder

Ramon F. A. de Punder

Head of Research, SB Statistics

For questions about our research, data or potential collaborations, please get in touch.

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