Lasne has 14,244 inhabitants within an area of 47.6 km². Residents have an average age of 43, and 51.1% are women. Homeowners make up 75% of residents; average annual net income per capita is €26,395. The population’s nationalities are 89.3% Belgian, 3% French, 1.2% Portuguese, 0.8% British, 0.8% Italian, 0.6% Dutch, 0.5% Romanian and 3.8% other. The average is 1.8 cars per household.
Apartment buildings represent 5.7% of Lasne’s dwellings, while houses account for 94.3%. Dwellings average 7.3 rooms, and the average year of construction for buildings is 1952. The building types are 75.2% open-type houses, farms or castles, 14% semi-closed houses, 5.6% buildings and flat blocks, 3.2% closed-type houses, 1% other types and 0.9% commercial houses. There are 5 flats for rent. Monthly rents average €1,205 and range from €875 to €1,400.
For journeys by road, the R0 entrance is a 7-minute drive from the centre, and access to the A4 / E411 - E25 is 11 minutes away. The N5, N253 and N271 are also main roads in Lasne. TEC bus lines serving the municipality include 36, 365a, 39, 57 and 58. Their listed connections include Braine-l'Alleud, Wavre, Brussels, Waterloo, Ottignies, LLN, La Hulpe and Genval. The closest stations to the town centre are Rixensart, Profondsart, Genval, Terhulpen / La Hulpe and Ottignies.
Childcare and schools include 14 nurseries, 10 nursery schools and 10 primary schools. Examples are Petit A Petit, Ecole Communale Pierre Van Hoegaerden and Ecole Communale De Plancenoit. There is no secondary school in the municipality. For groceries and everyday shopping, Lasne has 2 Carrefour stores, 2 Delhaize stores and 1 Delitraiteur. One electric-vehicle charging station is available; shared-bike and shared-car services are not available. Brussels Airport is 25 minutes away by car and 38 minutes by public transport.
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