Vacuuming keeps carpet tidy on top. It does nothing about the soil, oils and allergens that pack into the base of the pile — and that's the stuff that actually wears a carpet out and makes a room smell tired. A professional deep clean handles that layer, and the question is how often you genuinely need one.
The general rule: every 12–18 months
For an average household — a couple of adults, ordinary traffic, no pets — every 12 to 18 months is the sweet spot. Often enough to stop soil from setting into permanent traffic lanes, not so often you're spending money you don't need to. That's the baseline; the rest is adjustment.
What shortens the interval
- Pets — dander, the odd accident and tracked-in dirt push it to every 6–12 months.
- Young kids — spills, crumbs and floor-level living. Every 6–12 months.
- Allergies or asthma — carpet traps pollen, dust mites and dander; cleaning every 3–6 months measurably reduces the load.
- Heavy traffic — big or busy households wear lanes into the pile faster.
- Light-coloured carpet — shows everything, so it earns more frequent attention.
- Smoking indoors — carpet holds the residue and odour.
Your carpet warranty might require it
This one surprises people: many carpet manufacturers require professional hot-water extraction every 12 to 24 months to keep the warranty valid — and they want the receipts to prove it. Skip it and a future warranty claim can be denied. If your carpet is newer, dig out the warranty and check the wording.
Signs your carpet is overdue
- Darker "traffic lanes" through hallways and in front of seating.
- The carpet looks flat or dull even right after vacuuming.
- A musty or lingering smell that doesn't lift.
- Allergies that seem worse indoors.
- It's simply been more than 18 months.
A quick guide by household
- Adults, no pets, average use — every 12–18 months.
- Family with kids or a pet — every 6–12 months.
- Multiple pets, or allergy sufferers — every 3–6 months.
- Rental turnover — at every move-out, no matter the calendar.
When it is time, the method matters as much as the timing — a truck-mounted deep carpet clean pulls out what a vacuum and a rental machine leave behind, and dries in hours. Wondering what that costs? Our 2026 Calgary carpet cleaning price guide lays out the numbers honestly.