Visible dust blowing out of supply registers when the system starts
HVAC · Seattle, WA
Duct Cleaning in Seattle, WA
Most Seattle duct cleaning jobs land between $350 and $700 for a whole-home system, depending on the number of vents and duct accessibility. SPS Pro Services cleans ductwork throughout Seattle and King County, with most jobs scheduled within a few days and finished in a single visit.
Typical cost$350–$700
WarrantyWorkmanship warranty
AvailabilitySame-week visits
HoursMon–Fri 8am–6pm
Duct cleaning itself doesn't require a permit under Washington State code, but any duct repair, sealing, or modification uncovered during the job falls under L&I contractor registration rules and may require a mechanical permit through Seattle-King County or the local jurisdiction. We flag these issues upfront so you know exactly what's covered under standard cleaning and what would need separate permitted work before we touch it.
Local knowledge
What's different about duct cleaning in Seattle
Local housing stock and utilities in Seattle change what this work involves.
Many Seattle homes in neighborhoods like Ballard, Wallingford, and Greenwood still run original galvanized ductwork from the 1940s-60s, which traps decades of dust and often has gaps that need sealing, not just cleaning.
Seattle's damp winters and crawlspace-built craftsman homes create conditions where ducts running under the house can develop musty odors or light mold growth, especially in homes without a vapor barrier.
Homes on PSE electric service with heat pumps or electric furnaces tend to cycle air more often in our mild but humid climate, which pulls more dust and allergens through the duct system year-round.
Symptoms we see daily
Signs you need duct cleaning in Seattle
Musty or stale odor when the furnace or AC kicks on
Increased dust buildup on furniture shortly after cleaning
Recent renovation, pest infestation, or water damage near ductwork
Household members with unexplained allergy or respiratory irritation
No surprises
How a Seattle duct cleaning visit works
1
Inspection and code check
We inspect accessible ductwork, note any damage or disconnections, and flag anything that would require a permit or licensed repair work before cleaning.
2
Vent and register removal
We remove supply and return registers throughout the home to access the full duct run, not just the visible sections.
3
Negative pressure cleaning
A truck-mounted or portable vacuum system creates negative pressure inside the ductwork while we agitate and dislodge debris from the interior surfaces.
4
Component cleaning
We clean the blower compartment, coil area, and register covers, since dust buildup in these spots affects airflow as much as the ducts themselves.
5
Reassembly and airflow check
Registers go back in place and we check airflow at several vents to confirm the system is moving air the way it should before we leave.
Flat-rate pricing
Duct Cleaning in Seattle — what it costs
Conservative ranges for the Seattle metro. Your written quote is exact before work begins.
| Job | Typical price |
|---|---|
| In-home estimateExact flat quote for your home | Free |
| Standard duct cleaningTypical single-system job | $350–$470 |
| Mid-range duct cleaningHigher-capacity or multi-zone equipment | $470–$580 |
| Complex duct cleaningPremium equipment or difficult access | $580–$700 |
Prices reviewed by Sergei Petrov · July 2026. Parts availability can shift ranges — the quote you sign is final.
24/7 Emergency Line
Emergency dispatchNo heat at 11pm? We pick up.
Office hours are Mon–Fri, but the emergency line never closes. Call any hour and we dispatch a licensed tech across Greater Seattle.
Straight answers
Duct Cleaning in Seattle — FAQ
Do I need a permit for duct cleaning in Seattle?
No, standard duct cleaning is a maintenance service and doesn't require a permit in Seattle or King County. If we find damaged or disconnected ductwork that needs repair or replacement, that work falls under Washington State mechanical code and may require a permit, which we'll discuss with you before proceeding.
How often should ducts be cleaned in an older Seattle home?
For homes with original ductwork common in neighborhoods like Ballard or Greenwood, every 3 to 5 years is typical, or sooner if you've had rodent activity, a remodel, or visible dust around registers. Newer construction with sealed duct systems can often go longer between cleanings.
Can duct cleaning help with mold in a crawlspace duct run?
Cleaning removes surface dust and debris, but if we find active mold growth in ducts running through a Seattle crawlspace, that typically points to a moisture problem that needs to be addressed separately, often with a vapor barrier or better crawlspace ventilation, before cleaning alone will solve it.
Is SPS Pro Services licensed to work on ducts in King County?
Yes, we're registered to perform HVAC and duct work under Washington State L&I requirements and serve Seattle along with Bellevue, Redmond, Kirkland, Sammamish, and Issaquah. Any work beyond standard cleaning that requires a permit is handled according to local code.
Founder & Lead HVAC Technician, SPS Pro Services
EPA Section 608 UniversalNATE Core Certified14+ years in the trade
Reviews the pricing and service guidance on this page against SPS Pro Services's actual job records in Seattle and across the Seattle metro.
Prices reviewed July 2026
Also in Seattle
Other services our crew handles on the same routes.
Need duct cleaning in Seattle?
Call (206) 427-8907 to schedule duct cleaning in Seattle or ask about permit requirements for your home.