Ductwork Replacement cost in St. George, UT
St. George, UT · updated August 2026
$5,300
Typical local cost
$2,500 – $11,900
Typical range
- per supply run
- $250 – $600
- Permit
- Yes
- Typical timeline
- 1-3 days of work
Installed, local pricing
$80 – $290 in fees
1-3 days of work, 1-3 weeks including permitting
St. George runs -1% against the U.S. average · data confidence Medium · modeled estimate, not a quote
The modeled midpoint for St. George is $5,300. The local adjustment for this trade is x0.989 — driven mainly by Washington County labor rates and 55% exposure to local code requirements.
Estimate your St. George 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
- $8,407 – $15,824
- Rule-of-thumb check
- 400 sq ft per ton
Priced for St. George (local adjustment x0.989).
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 | $2,000 – $4,800 |
| 10 supply run | $2,500 – $6,000 |
| 13 supply run | $3,300 – $7,800 |
| 17 supply run | $4,300 – $10,200 |
| 22 supply run | $5,500 – $13,200 |
Based on St. George pricing of $250–$600 per supply run.
Where the money goes
- Labor
- $2,400
- 44% of median
- Materials
- $2,900
- 53% of median
- Permit & fees
- $185
- 3% of median
St. George project costs-1% vs U.S. average
Based on Washington 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 St. George 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
St. George labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$80–$104
HVAC crews in Washington County · -4% vs U.S. ($95/hr)
Typical crew
2 × 1.5 days
On-site time for a typical ductwork job here.
Labor in the price
$2,400
45% of the median — the rest is material, disposal and permit.
Because labor is 45% of this job, St. George 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 Washington County labor factor (x0.961). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why St. George differs from the national average
The local delta, broken into dollars by driver.
Trade labor rates-$100
Washington County crews price 4% below the national average, and labor is 45% of this job.
Code and inspection load+$50
Ductwork Replacement carries 55% exposure to local code requirements, and this jurisdiction's review load indexes at x1.01.
Basis: Decomposition of the modeled St. George median against the U.S. median for this scope. · City of St. George building department, Hometriva methodology
St. George vs Utah 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 St. George
$5,485
Likely range $2,685 – $12,085
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 St. George building departmentModeled estimate |
| electrical | City of St. George building departmentModeled estimate |
| mechanical | City of St. George building departmentModeled estimate |
| plumbing | City of St. George building departmentModeled estimate |
| zoning | City of St. George building departmentModeled estimate |
| fire | City of St. George building departmentModeled estimate |
Permit requirement in St. George
Yes — a permit is required for ductwork replacement in St. George, UT. 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 St. George building departmentModeled estimate
- Permit fee
- Estimated allowance $80–$290Modeled 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
| Market | Local factor | Median | Per supply run |
|---|---|---|---|
| St. George (this page) | x0.989 | $5,300 | $250 – $600 |
| North Las Vegas | x1.110 | $6,000 | $300 – $650 |
| Las Vegas | x1.057 | $5,700 | $250 – $650 |
| Henderson | x1.110 | $6,000 | $300 – $650 |
What St. George 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 St. George
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates St. George ductwork costs
Hometriva does not publish invented city prices. The St. George 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 factorx0.961
St. George-area trade labor rates, weighted at 45% of this job.
- Material factorx0.999
Material and delivery pricing into Washington County, weighted at 55%.
- Regulatory factorx1.013
Local code, product-approval and inspection load, applied at 55% for this project type.
- Applied multiplierx0.989
Blended St. George adjustment specific to ductwork replacement.
- Permit component$80 – $290
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 St. George 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 St. George, UT.
- • 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 St. George, UT?
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.