Cute, but riddled with errors. In my area (Arnhem / Nijmegen) it assigns 1975 as the date for buildings that are much newer. It also sets my house as 1925 when 1900 would have been more accurate (it was, however, split in 2 around 1920 or so - maybe that’s where the confusion comes from?)
In my case, the dataset is wrong. My entire neighbourhood was built in 1987, and my house had extensive renovations in 2010. Now my house is marked as being built in 2010. Oddly, pretty much every house in the neighbourhood has had some big renovation or other, but only mine and one other one ("2008") have the wrong date in the registry.
I'm not going to correct it, because it doesn't matter.
> I'm not going to correct it, because it doesn't matter.
It does matter (although it is possible you simply don't care). This data is used for a lot of purposes, which may include the calculation of your house's estimated worth for taxation.
Most municipalities do appreciate the feedback via https://bagviewer.kadaster.nl. A more accurate public dataset benefits society as a whole.
They do indeed seem to use the last time something significant was added to a building, which leads to strange dates such as a 19th building around the corner from where I live getting reported as 1983 because that, apparently, is when they added the hideously ugly front portal to it.
Strange thing is, they're inconsistent about it. De 1914 building De Vereeniging is listed as 1914 even though they've at the very least added a large conservatory to it since as well as a humongous - and very ugly and cheap looking - backstage area (though that was only this year, so maybe that hasn't ended up in the data set yet).
