Most homes get by on a light vacuum a couple of times a week, but that only ever deals with surface dust. Dirt, skin cells, allergens and odour-causing residue settle deeper into the pile over time, and no amount of vacuuming lifts them back out. That's the gap a proper steam clean is built to close.
As a general rule, a household with no pets or kids can get away with a professional steam clean once every 12 to 18 months. Add kids, pets, or high foot traffic and that drops to every 6 to 12 months. Rental properties and commercial spaces with constant turnover often need it closer to every 3 to 6 months to stay presentable and hygienic.
Watch for the practical signs too: carpet that looks flat and matted in walkways, a faint smell that airing the room doesn't fix, or visible staining that vacuuming hasn't shifted. Any one of those is a sign it's time to book a clean rather than wait out the calendar.
