Ductwork Replacement cost in Kent, WA
Kent, WA · updated August 2026
$6,500
Typical local cost
$3,000 – $14,500
Typical range
- per supply run
- $300 – $700
- Permit
- Yes
- Typical timeline
- 1-3 days of work
Installed, local pricing
$105 – $370 in fees
1-3 days of work, 1-3 weeks including permitting
Kent runs +21% against the U.S. average · data confidence Medium · modeled estimate, not a quote
Most Kent homeowners pay around $6,500. The local adjustment for this trade is x1.206 — driven mainly by King County labor rates and 55% exposure to local code requirements.
Estimate your Kent job
Priced with this market's cost index, so the calculator, the size table and the ranges on this page all agree.
Recommended size
5 tons
Round to the nearest half ton
- Cooling load
- 61,000 BTU/hr
- Typical equipment costInstalled, 14-17 SEER2
- $9,860 – $18,560
- Rule-of-thumb check
- 400 sq ft per ton
Estimates only. Local pricing, site conditions and code requirements change the real number.
Cost by project size
Generated from the same unit pricing the calculator uses.
| Project size | Estimated range |
|---|---|
| 8 supply run | $2,400 – $5,600 |
| 10 supply run | $3,000 – $7,000 |
| 13 supply run | $3,900 – $9,100 |
| 17 supply run | $5,100 – $11,900 |
| 22 supply run | $6,600 – $15,400 |
Based on Kent pricing of $300–$700 per supply run.
Where the money goes
- Labor
- $2,900
- 43% of median
- Materials
- $3,600
- 53% of median
- Permit & fees
- $240
- 4% of median
Kent project costs+21% vs U.S. average
Based on King County labor rates, local material logistics and permit-fee posture for this trade.
What the project looks like start to finish
Typical sequence for this scope. Timing varies with contractor backlog and plan-review queues.
01
Planning & quotes
Scope, material choice, contractor selection
02
Permit application
Filed with City of Kent building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
1-3 days of work, 1-3 weeks including permitting
05
Inspection
Duct rough-in, Duct leakage test, Final mechanical inspection
06
Closeout
Final sign-off, warranty and documentation
Kent labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$101–$131
HVAC crews in King County · +21% vs U.S. ($95/hr)
Typical crew
2 × 1.5 days
On-site time for a typical ductwork job here.
Labor in the price
$2,900
45% of the median — the rest is material, disposal and permit.
Because labor is 45% of this job, Kent wage levels move the price far more than material prices do. A quote well under this labor figure usually means a smaller crew, a longer schedule, or unlicensed help.
Basis: Hometriva labor model: national hvac crew rates adjusted by the King County labor factor (x1.208). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Kent differs from the national average
The local delta, broken into dollars by driver.
Trade labor rates+$500
King County crews price 21% above the national average, and labor is 45% of this job.
Material and delivery+$300
Materials are nationally traded, so they move less — but delivery into this market runs 10% over baseline.
Code and inspection load+$250
Ductwork Replacement carries 55% exposure to local code requirements, and this jurisdiction's review load indexes at x1.09.
Permit fees+$25
Fees are paid to the jurisdiction, not the contractor, and are budgeted separately from the contract price.
Basis: Decomposition of the modeled Kent median against the U.S. median for this scope. · City of Kent building department, Hometriva methodology
Kent vs Washington vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated ductwork replacement in Kent
$6,740
Likely range $3,240 – $14,740
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Number of supply and return runs
- Flex duct versus rigid sheet metal
- Attic access and clearance
- Return air sizing corrections
- Removal of contaminated duct board
Who issues each permit
Tracked per discipline — the building permit issuer is not always the body that reviews electrical, plumbing, zoning or fire.
| Discipline | Issuing authority |
|---|---|
| building | City of Kent building departmentModeled estimate |
| electrical | City of Kent building departmentModeled estimate |
| mechanical | City of Kent building departmentModeled estimate |
| plumbing | City of Kent building departmentModeled estimate |
| zoning | City of Kent building departmentModeled estimate |
| fire | City of Kent building departmentModeled estimate |
Permit requirement in Kent
Yes — a permit is required for ductwork replacement in Kent, WA. The work must be inspected before it can be closed out, and a licensed contractor generally has to pull the permit.
- Permitting authority
- City of Kent building departmentModeled estimate
- Permit fee
- Estimated allowance $105–$370Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Duct rough-in
- Duct leakage test
- Final mechanical inspection
Local conditions that change this job
Only the exposures that materially affect ductwork replacement.
Cooling load / heat exposure
Severe82/100
Humidity
Severe84/100
Kent sits in King County, Washington. Persistent rainfall and moisture management dominate exterior detailing, while seismic provisions apply to structural and foundation work. Work outside city limits is permitted by the county building department rather than the city.
Nearby market comparison
What Kent homeowners actually paid
Real reported invoices from this market, aggregated. Add yours — it takes 20 seconds and no personal details.
Quotes homeowners were given in Kent
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Kent ductwork costs
Hometriva does not publish invented city prices. The Kent estimate for ductwork replacement is produced by this chain, and every input is stored separately:
- National baseline$5,400
Typical U.S. cost for ductwork replacement on a single-family home.
- Local labor factorx1.208
Kent-area trade labor rates, weighted at 45% of this job.
- Material factorx1.105
Material and delivery pricing into King County, weighted at 55%.
- Regulatory factorx1.086
Local code, product-approval and inspection load, applied at 55% for this project type.
- Applied multiplierx1.206
Blended Kent adjustment specific to ductwork replacement.
- Permit component$105 – $370
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, ductwork replacement in Kent carries a different local adjustment than other trades in the same market.
Reviewed by
Hometriva Cost Data Desk
Maintains the unit-cost baselines, local adjustment factors and material pricing. Reviewed for ductwork replacement pricing in Kent, WA.
- • National unit-cost baselines against current trade pricing
- • Local labor and materials factors for the market
- • Material installed-cost ranges and service life
Last reviewed August 2026 · Editorial standards · Report an error
Frequently asked questions
Does duct replacement need a permit in Florida?
Yes. Replacing a duct system requires a mechanical permit and a duct leakage test in most Florida jurisdictions, because duct leakage is regulated under the energy code.
Sources
Sources & verification
Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.