Ductwork Replacement cost in Kahului, HI
Kahului, HI · updated August 2026
$8,700
Typical local cost
$4,000 – $19,300
Typical range
- per supply run
- $400 – $950
- 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
Kahului runs +61% against the U.S. average · data confidence Medium · modeled estimate, not a quote
The modeled midpoint for Kahului is $8,700. The local adjustment for this trade is x1.608 — driven mainly by Maui County labor rates and 55% exposure to local code requirements.
Estimate your Kahului 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
- $13,668 – $25,728
- Rule-of-thumb check
- 400 sq ft per ton
Priced for Kahului (local adjustment x1.608).
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 | $3,200 – $7,600 |
| 10 supply run | $4,000 – $9,500 |
| 13 supply run | $5,200 – $12,400 |
| 17 supply run | $6,800 – $16,200 |
| 22 supply run | $8,800 – $20,900 |
Based on Kahului pricing of $400–$950 per supply run.
Where the money goes
- Labor
- $3,900
- 44% of median
- Materials
- $4,800
- 54% of median
- Permit & fees
- $240
- 3% of median
Kahului project costs+61% vs U.S. average
Based on Maui 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 Kahului 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
Kahului labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$148–$191
HVAC crews in Maui County · +77% vs U.S. ($95/hr)
Typical crew
2 × 1.5 days
On-site time for a typical ductwork job here.
Labor in the price
$3,900
45% of the median — the rest is material, disposal and permit.
Because labor is 45% of this job, Kahului 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 Maui County labor factor (x1.767). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Kahului differs from the national average
The local delta, broken into dollars by driver.
Trade labor rates+$1,875
Maui County crews price 77% above the national average, and labor is 45% of this job.
Material and delivery+$1,025
Materials are nationally traded, so they move less — but delivery into this market runs 35% 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 Kahului median against the U.S. median for this scope. · City of Kahului building department, Hometriva methodology
Kahului vs Hawaii 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 Kahului
$8,940
Likely range $4,240 – $19,540
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 Kahului building departmentModeled estimate |
| electrical | City of Kahului building departmentModeled estimate |
| mechanical | City of Kahului building departmentModeled estimate |
| plumbing | City of Kahului building departmentModeled estimate |
| zoning | City of Kahului building departmentModeled estimate |
| fire | City of Kahului building departmentModeled estimate |
Permit requirement in Kahului
Yes — a permit is required for ductwork replacement in Kahului, HI. 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 Kahului 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
Nearby market comparison
What Kahului homeowners actually paid
Homeowner-reported invoices for this market. Nothing is published until enough reports clear review, so this section is often empty in newer markets — adding yours takes 20 seconds and no personal details.
Quotes homeowners were given in Kahului
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Kahului ductwork costs
Hometriva does not publish invented city prices. The Kahului 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 factorx1.767
Kahului-area trade labor rates, weighted at 45% of this job.
- Material factorx1.345
Material and delivery pricing into Maui County, weighted at 55%.
- Regulatory factorx1.086
Local code, product-approval and inspection load, applied at 55% for this project type.
- Applied multiplierx1.608
Blended Kahului 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 Kahului 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 Kahului, HI.
- • 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
Do I need a permit for ductwork replacement in Kahului, HI?
In most jurisdictions this work is permitted and inspected. Requirements are set locally, so confirm the current application and inspection checklist with your building department before work starts.
How long does ductwork replacement take?
1-3 days of work, 1-3 weeks including permitting. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are number of supply and return runs; flex duct versus rigid sheet metal; attic access and clearance.
Sources
Sources & verification
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.