23/03/2025
Beware of Online House Value Simulators in Luxembourg
Dear house owners in Luxembourg, or buyers looking for a good opportunity.
Just be careful, if you are using an online price simulation tool to value your house (or the house you want to purchase).
Those tools might look sexy and easy to handle, they can even work when you want to value an apartment. But please, please avoid them, if you want to know the value of a house. They are often totally wrong.
As a professional who handles between 70 and 90 real estate valuations per year, over the last months I have been alerted about completely stupid price results coming out of those online simulators.
So I tested them out, and came to the conclusion, that their algorithm seems to be based on stats gathered on apartment sale and advertising data. They seem to ignore one important factor, that is the value of land in Luxembourg.
I invite you to go to one of our major real estate portals, and do the test for yourself:
- select a house (yours, the one you want to purchase, or simply want to value), enter all known data, including the size of the plot. Save the result.
- then, do exactly the same procedure, but double the size of the plot.
Compare the results, and you will see, that regardless of the size of the land, the valuation of the house will be the same. This means, that in Luxembourg buildable land has got no value in the pricing of a house.
I actually also tried it on my own house, and if I follow the result of our wellknown real estate portal, I come to following conclusion:
1) my beautiful house in Bridel on 3,80 ares of land is according to the simulator worth 37% MORE than my own estimate (yeaaaah)
2) my beautiful house in Bridel would be worth the same price, if the land were 12 ares (whoooooo)
We have a department in Luxembourg, that handles statistics on real estate (Observatoire de l'Habitat, part of Ministère du Logement). It relies on regular stats gathered by LISER, and actually contains very interesting data, that I regularly use in my reports and valuations.
But please be informed there are NO stats on house prices, house sales, simply because there are no reliable stats on house areas. They exist for apartments, but not for houses. When you rely on all notarial data, you can extrapolate an average price/sqm for an apartment, because that data is contained in the deeds signed in the past. But there are no surfaces/areas mentioned in deeds regarding houses, so how do you want to extrapolate a price/sqm on those?
Therefore, if you want to know the real value of your house, call a professional. It does not have to be a real estate agent, engineering experts can also do the trick.
Stay safe.
Alex Alexandrino
Managing Partner