Apartment buyers will find a housing stock dominated by houses: 90.5% of dwellings are houses and 9.5% are in apartment buildings. Across the municipality, 33.5% of buildings are semi-detached houses, 29.8% detached houses, farms or castles, 23.2% terraced houses, 9% buildings and blocks of flats, 3% commercial houses and 1.5% other types. The average home has 5.9 rooms, and the buildings date from around 1960. Deerlijk has 1 flat for sale, listed at €79,000; the current average and the lowest and highest listed prices are all €79,000.
The municipality has 11,946 residents across 17 km². The average age is close to 42, women account for 50.7% of the population, and 80% of residents own their homes. Average net income is €19,682 a year. Nationalities are recorded as 97.1% Belgian, 0.7% Polish, 0.2% Dutch, 0.2% Moroccan, 0.2% French, 0.2% Spanish, 0.1% Italian and 1.4% other. Households have about 1.3 cars on average.
Road connections include the A14/E17, whose access is a 4-minute drive from the centre, and the A17/E403, reachable in 13 minutes. The A14/E17 links Antwerp, Sint-Niklaas, Ghent, Kortrijk and Lille; the A17/E403 runs between Bruges, Kortrijk and Tournai. N36e and N36 are also main roads in Deerlijk. There are 6 De Lijn bus lines. Among the routes listed are 71 and 72 towards Ghent, 89 between Antwerp L.O., Kallo and Kieldrecht, 92 between Diest, Lummen and Heusden, and 99 between Hamme, Temse, Rupelmonde and Antwerp L.O. The nearest stations to the centre are Vichte, Harelbeke, Kortrijk, Waregem and Anzegem.
Local facilities include 4 nurseries, 5 nursery schools and 8 primary schools; there is no secondary school. The shops include OKay, Match/Smatch, SPAR, Aldi and Carrefour, with 1 of each listed. Deerlijk has no shared-bike or shared-car service and no known charging station for electric vehicles. Wevelgem Airport can be reached in 13 minutes by car, or in 57 minutes by public transport.