Ductwork priced by weight often runs about $2-$6 per pound for fabricated sheet-metal material, but most HVAC contractors quote by duct size, length, fittings, and labor instead. For a typical home, new or replacement ductwork may cost $2,000-$6,000, with access, duct material, system size, and local labor rates driving the final estimate.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Sheet-metal duct material | $2 per lb | $4 per lb | $6 per lb | Fabricated material; gauge and shape affect weight and price |
| Installed duct run | $10 per linear ft | $18 per linear ft | $30 per linear ft | Basic residential runs; fittings and access can raise the rate |
| Partial replacement | $500 | $1,500 | $3,000 | Several accessible branches or a small trunk section |
| Whole-home replacement | $2,000 | $4,000 | $8,000 | Typical house; difficult access or extensive modifications may exceed this |
What ductwork costs per pound versus installed
Weight-based pricing is most useful when comparing raw or fabricated sheet metal, not a finished HVAC installation. A rough material-only range is $2-$6 per pound, including common galvanized duct components. Custom shapes, heavier metal, insulation, and small fabrication orders can push the effective rate higher. Scrap or salvage value is a separate market and should not be confused with the price of new duct.
Installed pricing includes more than metal. A contractor may charge roughly $10-$30 per linear foot for straightforward duct runs, while a full residential replacement often lands around $2,000-$6,000. Larger houses, multiple floors, extensive branch lines, or work inside finished ceilings may cost more. Flexible duct is often less costly for accessible short runs, while rigid sheet metal can cost more to fabricate and fit.
Use a per-pound figure to compare material, but use a complete installed quote to budget the HVAC job. A useful estimate identifies duct type, dimensions, insulation, fittings, sealing, removal, and labor. Assumptions: U.S. residential project, standard galvanized material, ordinary access, and no major HVAC equipment replacement.
How sheet metal, fittings, and labor shape the quote
A ductwork estimate may bundle materials and installation or list them separately. The following ranges show common residential allowances; they are not additive in every bid because contractors package fabrication and labor differently. A complex layout can also require more fittings and support than its total duct weight suggests.
| Quote item | Typical range | Pricing basis | What changes it |
|---|---|---|---|
| Galvanized duct material | $2-$6 | Per lb | Gauge, shape, order size, and supplier |
| Flexible duct | $2-$6 | Per linear ft, material only | Diameter, insulation, and product quality |
| Sheet-metal fabrication and fittings | $5-$20 | Per fitting or transition | Custom dimensions, elbows, takeoffs, and access |
| Installation labor | $75-$150 | Per crew-hour | Local wage rates, crew size, and working conditions |
| Removal and disposal | $200-$800 | Per project | Amount removed and disposal requirements |
| Sealing and insulation | $1-$4 | Per linear ft | Duct location, insulation rating, and leakage repair |
Labor can be estimated with . For instance, a two-person crew working 12 hours at a combined billing rate of $150-$250 per crew-hour would represent $1,800-$3,000 in labor before materials, removal, and other charges. Actual contractor pricing may use a fixed project quote rather than hourly billing.
Fittings, sealing, and access often matter as much as the weight of the straight duct. Ask whether the estimate includes boots, takeoffs, hangers, insulation, balancing, and patching. If a quote lists only a weight and a lump-sum labor charge, request dimensions and a clear scope before comparing it with another bid.
Why duct gauge, diameter, and layout change the price
Duct weight and material cost rise with larger dimensions and thicker metal, but installation difficulty can be the bigger expense. A 6-inch branch serving a room is not priced like a large trunk line. Duct diameter, total run length, number of branches, and the number of turns determine the amount of material and fitting work.
Metal thickness is commonly specified by gauge; lower gauge numbers mean thicker, heavier steel. A change from 28-gauge to 26-gauge duct can add material weight and cost, particularly on long trunk sections. The required gauge depends on duct dimensions, pressure, local code, and design specifications, so it should not be reduced solely to lower a quote.
Insulation needs also vary. Duct in an unconditioned attic or crawlspace may require insulation that would not be needed for a run inside conditioned space. A 20-foot accessible branch is generally simpler than a 40-foot run crossing several joists, even if the metal weight is similar. Existing framing, tight crawlspaces, and finished ceilings can require extra labor or access openings.
Compare equivalent duct sizes, gauges, insulation, and fitting counts before judging a per-pound or per-foot rate. A quote that substitutes smaller duct or omits insulation may look cheaper but can fail to meet design or code requirements. Changes to duct diameter should be reviewed by a qualified HVAC professional because airflow and system performance depend on proper sizing.
Ways to lower a ductwork bill without cutting capacity
Keep the replacement scope tied to documented problems. If most ductwork is sound and leakage is limited to a few accessible joints, sealing or replacing damaged sections may cost less than a whole-house job. Ask the contractor to distinguish repairable leaks, crushed runs, disconnected branches, and duct that is undersized or contaminated beyond practical cleaning.
Prepare the work area by clearing stored items near attic hatches, crawlspace entrances, and registers. Better access can reduce setup and labor time. If the crew must move belongings, remove obstructions, or create access through finished surfaces, the additional work may be billed separately.
Compare at least two or three written quotes with the same scope, duct dimensions, insulation, and removal requirements. Request separate pricing for optional upgrades, such as premium insulation or extensive register changes. Bundling duct replacement with other planned HVAC work may reduce repeated mobilization, but compare the combined price with separate bids rather than assuming a package is cheaper.
Control the scope and preserve airflow requirements instead of choosing duct solely by the lowest weight price. Avoid paying for replacement of sound ducts unless inspection or system design supports it. Do not remove required insulation or choose thinner metal without confirmation that the design and applicable code allow it.
How many labor hours a residential duct job takes
A small, accessible repair may take 2-6 hours, while replacing several branches can take one workday. A full replacement in a single-story house with an open attic may require 1-3 days; a multi-story home or a property with tight crawlspace access can take 3-5 days. These are planning ranges, not guarantees, and finishing work or HVAC balancing may extend the schedule.
Labor rates commonly fall around $75-$150 per technician-hour when billed individually, though estimates often use crew rates or fixed prices. The number of workers does not always shorten a job proportionally: coordination, fabrication, testing, and access limits remain. Ask whether the quote includes removal, sealing, insulation, airflow checks, and cleanup.
Access and layout determine whether a short duct run is truly a short job. A contractor may need to inspect the attic or crawlspace before confirming hours. Quotes based only on room count can miss long runs, restricted access, or numerous transitions, so a site visit is valuable for a large replacement.
Regional ductwork pricing from rural homes to major cities
Labor and contractor overhead vary by market. As a broad comparison, installed ductwork in lower-cost rural or small-town areas may run about 10%-20% below a national midrange, while major metropolitan areas can be 15%-35% higher. These differences are not universal: local competition, travel distance, building type, and seasonal demand can narrow or widen the gap.
Material pricing may also differ with supplier availability and delivery distance. A rural project far from a metal fabricator can face higher freight or travel charges, even where hourly labor rates are lower. In dense cities, parking, building rules, limited work hours, and elevator access can increase labor time and project overhead.
Compare local quotes rather than applying a national per-pound rate to a finished installation. Check that each contractor is pricing the same material grade and scope. Any regional percentage is a planning adjustment, not a substitute for an on-site estimate.
Three sample quotes for common ductwork projects
These examples illustrate how scope changes the total. The assumed rates are typical planning figures, not guaranteed bids. Materials and labor are shown as approximate portions of a complete quote, and taxes, permits, or HVAC equipment are excluded unless noted.
| Project | Scope and labor | Estimated total | Price detail |
|---|---|---|---|
| Replace two damaged branches | 30 linear ft of insulated duct; 4-6 labor hours | $600-$1,200 | $15-$30 per installed ft, including basic fittings |
| Replace attic duct system | 180 linear ft; 2-person crew for 1-2 days | $3,000-$5,500 | Approx. $17-$31 per installed ft with removal and sealing |
| Custom sheet-metal trunk and branches | 220 linear ft; 2-person crew for 2-3 days | $5,000-$8,500 | Higher fabrication and fitting allowance; material may total 400-700 lb |
In the custom example, material weight is only a rough estimate because duct dimensions and gauge determine pounds per foot. At $2-$6 per pound, 400-700 pounds would imply roughly $800-$4,200 for material, before installation, insulation, fittings, and disposal. This wide spread shows why a weight-only quote needs a material specification.
The same home can receive very different totals when access and custom fabrication differ. Use sample prices to identify questions for a contractor, not as a substitute for measuring the system and confirming its design.
When duct repair costs less than full replacement
Sealing accessible joints or reconnecting a loose branch may cost about $150-$600, depending on access and the number of locations. Replacing a short damaged section can be around $300-$1,000. A cleaning service is a separate expense and does not repair crushed, leaking, or poorly sized ductwork.
Replacement becomes more compelling when ducts have widespread leakage, collapsed sections, failed insulation, or a layout that prevents adequate airflow. If damage is limited to a few areas, a contractor can price targeted repairs alongside full replacement. For older systems, also check whether the duct design matches the current HVAC equipment; new equipment connected to badly sized ducts may not deliver expected performance.
Ask for repair and replacement alternatives when the problem is localized. The lowest immediate bill is not always the lowest long-term expense if repeated repairs continue, but replacing an intact system without a clear reason can waste money. Request the inspection findings and the specific basis for recommending a full replacement.