Mettet covers 116.9 km² and has 13,102 inhabitants. The average age is 40, and 50.9% of residents are women. Home ownership is common: 76% of residents own their homes. Average annual net income per person is €18,167, and households have an average of 1.4 cars. The population is 97.2% Belgian, 1.1% Italian, 0.8% French, 0.1% Romanian, 0.1% Spanish, 0.1% Chinese, 0.1% Portuguese and 0.6% other nationalities.
Houses make up 93.8% of the housing stock, while apartment buildings account for 6.2%. Buildings date on average from around 1927, and homes have an average of 6.3 rooms. The building mix includes 45.5% open-type houses, farms and castles, 28.6% semi-detached houses, 14.3% closed-type houses, 5.8% buildings and flat blocks, 3.8% other building types and 2% commercial houses. There are 35 houses for sale in Mettet. The average asking price is €364,587, with listings ranging from €30,000 to €1,400,000.
Rue de Bambois and roads N98, N573, N574 and N932 serve the commune. By car, an entrance to the A15/E42 is 20 minutes away, while an entrance to the A54/E420 is 22 minutes from the town centre. TEC bus services include line 137 between Acoz and Mettet, line 150a between Tamines and Ermeton-sur-Biert, line 6 between Namur and Mettet, line 61 between Florennes and Mettet/Ermeton-sur-Biert, and line 64 between Namur and Biesme. The nearest railway stations to the centre are Tamines, Aiseau, Châtelet, Le Campinaire and Farciennes. There are 14 nurseries, 12 nursery schools and 12 primary schools in the commune, but no secondary school. Supermarkets include 1 Intermarché, 1 Colruyt and 1 Delhaize.
Mettet has 1 electric-vehicle charging station. There are no shared bicycles or shared cars in the commune. Brussels South Charleroi Airport is 25 minutes away by car or 97 minutes by public transport. These transport links, local services and the range of house types form part of the setting for the houses currently listed for sale in Mettet.