Apartment buildings and flat blocks account for 7.4% of building types in Lessines / Lessen, while the overall housing stock is 7.6% apartment buildings and 92.4% houses. Dwellings average 5.8 rooms and date from around 1920. The municipality covers 72.7 km² and has 18,656 residents, with an average age of 41. Women represent 50.9% of the population, and 76% of residents own their homes. Average annual net income per person is €16,816. Nationalities are 94.4% Belgian, 1.3% French, 0.9% Italian, 0.6% Romanian, 0.5% Portuguese, 0.4% Spanish, 0.2% Moroccan and 1.8% other.
There are 4 flats for sale, with an average price of €170,750. Current asking prices range from €120,000 to €189,000. The wider mix of buildings includes 37.1% open-type houses, farms and castles, 32.2% closed-type houses, 20.2% semi-closed-type houses, 7.4% buildings and flat blocks, 2.4% commercial houses and 0.6% other types. The A8 / E429 - E42, on the Halle–Tournai–Lille route, is 5 minutes by car from the centre; access to the A10 / E40 towards Brussels, Aalst, Gent, Brugge and Oostende takes 31 minutes. The N42, N56, N57, N521 and N529 are also accessible in the municipality.
TEC bus services include line 10 between Saint-Ghislain and Herchies, and line 87 between Ronse/Renaix and Enghien/Edingen. Stations near the town centre are Lessen / Lessines, Houraing, Akren / Acren, Papegem / Papignies and Rebaix. The local school network comprises 16 nurseries, 16 nursery schools, 15 primary schools and 3 secondary schools. Ecole Des Trois Tilleuls and Ecole Fondamentale Annexée Lessines are among the nursery-school examples; École Fondamentale Communale and École Communale “les Galopins” are primary examples. Secondary schools include Athenee Royal Rene Magritte and College Visitation - La Berliere.
For everyday shopping, there are 2 Delhaize supermarkets, 1 Trafic, 1 Intermarché, 1 Aldi and 1 LIDL. Businesses in the municipality include hairdressing and other beauty treatment, mixed farming, electrical installation, restaurants and mobile food service, beverage serving, and specialised construction. Lessines / Lessen has 1 electric charging station, with no shared bicycles or shared cars available. Wevelgem Airport can be reached in 40 minutes by car or 126 minutes by public transport.