Mont-Saint-Guibert covers 18.7 km² and has 7,771 inhabitants. The average age is about 39, and 67% of residents own their homes. Average net income is €21,044 per person per year. The population is 93.8% Belgian, 2.1% French, 0.7% Italian, 0.4% Romanian, 0.3% Spanish, 0.2% Portuguese, 0.2% Congolese and 2.2% other nationalities. Women make up 50.5% of the population. Houses account for 76.6% of the building stock, compared with 23.4% apartment buildings. Building types comprise 43.2% detached houses, farms and castles, 22.2% buildings and apartment blocks, 20.6% semi-detached houses, 8.7% terraced houses, 4.1% other types and 1.3% commercial houses. Homes have an average of 5.8 rooms, and buildings date on average from around 1951.
There are 15 houses for sale. The average asking price is €408,933, with current prices ranging from €160,000 to €780,000. The A4/E411–E25, on the Brussels–Namur–Arlon route towards Luxembourg City, is about a 4-minute drive from the centre; the R0 Brussels ring is about 15 minutes away. The N4, N25A and N233 are also accessible. TEC bus services include lines 24, 31, 34, 51 and 52, among 8 lines serving the municipality. The nearest stations to the centre are Mont-Saint-Guibert, Blanmont, Court-Saint-Étienne, Louvain-la-Neuve and Chastre.
For families, the municipality has 9 nurseries, including Sophie Janssens and Les Hirondelles. There are 2 nursery schools, including Institut Notre-Dame Des Hayeffes – Cycles 2,5–8 and Ecole Fondamentale Autonome Nil-Saint-Vincent; 3 primary schools, including Ecole Fondamentale Autonome Nil-Saint-Vincent and Institut Notre-Dame Des Hayeffes – Cycles 8–12; and 1 secondary school, College Des Hayeffes. Grocery options include Bio-Planet, SPAR, Carrefour and Colruyt, with 1 of each listed in the municipality.
Mont-Saint-Guibert has 1 electric-vehicle charging station. There are no shared bicycles or shared cars in the municipality. Brussels South Charleroi Airport is 28 minutes away by car or 66 minutes by public transport. These local connections and services sit alongside a housing stock in which detached houses, farms and castles form the largest listed building category.