Province of Walloon Brabant – Wallonia
Property prices in Lasne
In 2025, the median sale price in Lasne was €740,000 for a house (184 sales), according to Statbel. The latest figures: in the first half of 2026, the median house sold for €740,000, against €670,000 in the first half of 2025.
Median house, first half of 2026
€740,000
+10.4% on Jan–Jun 2025 (€670,000), 90 sales
Median house, 2025
€740,000
Middle 50% of sales: €537,500–€997,500
Bought at the 2025 median of €740,000 as your only home, a house in Lasne costs about €767,000 all-in, with registration tax and notary fees. Borrowing 80% of the price adds about €12,000 for the mortgage deed. Since 2025 an only home in Wallonia pays 3%, a rate that replaced the old allowance (the abattement). The true cost of buying a home in Belgium, item by item
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| Property type | Median price 2025 | Middle 50% of sales | Sales |
|---|---|---|---|
| Terraced or semi-detached house | €456,250 | €357,500–€690,000 | 30 |
| Detached house | €800,000 | €600,000–€1,090,000 | 154 |
First half of 2026, against the first half of 2025
| Property type | First half of 2025 | First half of 2026 | Change | Sales, Jan–Jun 2026 |
|---|---|---|---|---|
| All houses | €670,000 | €740,000 | +10.4% | 90 |
| Terraced or semi-detached house | – | €563,500 | – | 23 |
| Detached house | €685,000 | €815,000 | +19.0% | 67 |
In 2025, 184 houses changed hands in Lasne, 52.1% more than in 2024. Detached houses sold for 75% more than terraced or semi-detached ones (median €800,000 against €456,250).
Asking price per m² in Lasne
| Property type | Median asking price per m² |
|---|---|
| Houses | €3,591/m² |
| Apartments | €4,146/m² |
On 26 October 2026, 141 houses and 9 apartments in Lasne were advertised for sale on Immoweb. Immoweb marked 56% of the apartments as under offer.
Median sale price in Lasne since 1980
HousesApartmentsShaded: middle 50% of sales
In 1980, the median house in Lasne sold for €60,146, and in 2000 for €136,341 (Belgian francs converted to euros); today it is €740,000, about 12 times as much as in 1980.
How prices are moving
In Lasne, the median house price rose 13.8% in 2025, 17.5% over five years and 46.5% over ten years. The latest figures: in the first half of 2026, the median house sold for €740,000, against €670,000 in the first half of 2025.
| 2024–2025 | 2020–2025 | 2015–2025 | |
|---|---|---|---|
| Houses | +13.8% | +17.5% | +46.5% |
Price history in Lasne, year by year
| Year | Median house | Median apartment |
|---|---|---|
| 2025 | €740,000 | – |
| 2024 | €650,000 | – |
| 2023 | €632,000 | – |
| 2022 | €704,125 | – |
| 2021 | €600,000 | – |
| 2020 | €630,000 | – |
| 2019 | €535,500 | – |
| 2018 | €550,000 | – |
| 2017 | €480,000 | – |
| 2016 | €470,000 | – |
| 2015 | €505,000 | – |
| 2014 | €475,000 | – |
| 2013 | €480,000 | – |
| 2012 | €532,500 | – |
| 2011 | €530,000 | – |
| 2010 | €449,000 | – |
Compared with the province and Belgium
| Lasne | Province of Walloon Brabant | Belgium | |
|---|---|---|---|
| Median house price | €740,000 | €405,000 | €315,000 |
| Median apartment price | – | €260,000 | €250,000 |
Over ten years, the median house price in Lasne rose 46.5%, against a 57.5% rise across Belgium.
Lasne has the highest 2025 median house price in Walloon Brabant province.
Who lives in Lasne
Incomes run above the Belgian median: the typical tax declaration in Lasne showed €34,046 in 2023, 13% more than nationally. Most households here own their home: 76% did at the 2021 census, against 65% across Belgium. The population is stable at 14,151 residents (2026), +0.1% since 2016.
Flood risk in Lasne
Flood exposure is marginal: 1.3% of the commune’s area lies in a medium or high flood-hazard zone (0.7% in the high class), with another 4.3% in the low class. Flood and soil are two of the checks to run on one specific home before you sign; our guide to what to check before making an offer covers the rest.
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Nearby communes
On median house prices, Lasne tops this list; Waterloo comes nearest below, at €550,000.
| Commune | House median | Apartment median |
|---|---|---|
| Genappe | €330,000 | €317,000 |
| Ottignies-Louvain-la-Neuve | €410,000 | €236,000 |
| Braine-l’Alleud | €415,000 | €290,000 |
| Rixensart | €485,000 | €309,000 |
| La Hulpe | €530,000 | – |
| Waterloo | €550,000 | €380,000 |