Ductwork Cost Per Linear Foot: Typical Prices and What Drives the Price 2026

Typical buyers pay $6-$18 per linear foot for installed ductwork depending on type, size, insulation, and access; total job pricing usually ranges from $800 to $6,000 for most homes. This article focuses on ductwork cost per linear foot and the main drivers contractors quote first.

Item	Low	Average	High	Notes
Flexible Duct (installed)	$4 per lf	$7 per lf	$12 per lf	Assumptions: 6″–10″ diameters, basic insulation
Round Sheet Metal Duct	$8 per lf	$12 per lf	$20 per lf	16–24 gauge galvanized, typical home runs
Rectangular/Spiral Duct	$10 per lf	$16 per lf	$30 per lf	Includes fittings; larger sizes cost more
Insulation Add-On	$1 per lf	$3 per lf	$6 per lf	R-4 to R-8 common; higher R for attic runs
Typical Full-System Replace	$800	$2,800	$6,000	Assumptions: 1,000–2,000 sq ft home, mixed materials, normal access.

Typical Ductwork Cost Per Linear Foot for Common Types

Buyers usually see installed ductwork prices expressed per linear foot: flexible, round sheet metal, and rectangular/spiral are the main categories.

Flexible duct (6″–10″) installed: $4-$12 per linear foot; used for short branch runs and tight areas. Round galvanized sheet metal: $8-$20 per lf for 6″–18″ diameters. Rectangular, spiral, or custom-fabricated duct runs: $10-$30 per lf, depending on gauge and complexity. These ranges include basic fittings and standard hanging straps but exclude major demolition or high-access work.

Assumptions: Midwest labor rates, standard materials, normal attic/crawl access.

Breaking Down Material, Labor, Equipment, and Disposal Costs

A typical quote separates Materials, Labor, Equipment, and Disposal so buyers can see where money goes.

Materials	Labor	Equipment	Disposal	Taxes/Overhead
$2-$12 per lf (duct, fittings, sealant)	$40-$100 per hour	$50-$300 (lift/scaffold rental)	$50-$400 flat or $25-$100 per ton	5%–10% of subtotal

Typical labor crews: 1–3 techs; install time affects per-foot rate because setups add fixed hours.

How Diameter, Length, Insulation R-Value, and Access Change Quotes

Key numeric drivers: duct diameter/shape, total linear feet, insulation R-value, and access hours strongly change per-foot pricing.

Diameter and shape: 6″–10″ flexible runs cost $4-$9 per lf; 12″–18″ round sheet metal jumps to $10-$18 per lf; rectangular runs over 20″ wide often cost $18-$30 per lf. Length thresholds: jobs under 50 lf usually have higher per-foot rates due to setup time; 50–300 lf averages apply lower unit pricing. Insulation: adding R-6 increases $2-$5 per lf; R-8 or wrap systems add $4-$6 per lf. Access: attic or cramped crawlspace adds $1-$6 per lf or hourly premium.

Practical Ways To Lower Ductwork Price Per Linear Foot

Controlling the scope, preparing access, and choosing simpler materials are the most effective cost reductions.

Combine work: schedule duct replacement with HVAC service to avoid duplicate mobilization fees. Reduce run length: relocate equipment or registers to shorten linear footage. Choose efficient layouts and round ducts where possible rather than custom rectangular. Do prep work: clear attic/crawl access and provide power and ladders to avoid equipment rental. Request itemized quotes to compare material and labor splits rather than only totals.

Regional Price Differences: Urban, Suburban, and Rural Variations

Expect 10%–30% regional variation: urban coastal markets cost more; rural areas can be lower but travel or minimum charges apply.

Typical deltas: coastal cities and high-demand metro areas +15%–30%; suburban midwest and south roughly average; rural or low-cost states can be -10% to -20%. Labor rate examples: $75-$125 per hour in expensive metro areas versus $50-$85 per hour in lower-cost regions. Delivery time and contractor availability can also add rush premiums in busy seasons.

Sample Quotes: Three Real-World Duct Runs With Pricing Details

Concrete examples help translate per-foot estimates into realistic totals for common projects.

Scenario	Specs	Labor Hours	Per lf	Total
Small Branch Replace	30 lf flexible, 8″ dia	2 hrs	$6 per lf	$180
Whole-House Run	220 lf mixed round sheet metal, avg 12″	24 hrs	$14 per lf	$3,080
Rectangular Kitchen Run	60 lf, custom 10″x20″	8 hrs	$22 per lf	$1,320

Assumptions: includes basic fittings, seals, and standard insulation where noted; does not include major drywall work or permit upgrades.

Add-Ons And Fees That Often Increase The Final Invoice

Common extras: grills/registers, fire dampers, asbestos/old-duct removal, and permit fees—each can add hundreds to thousands to the bill.

Examples: supply registers $15-$75 each; fire damper installs $150-$450 each; asbestos remediation can be $1,000-$5,000 depending on extent; permits typically $50-$400 depending on locality. Always request a clear line-item for these add-ons to avoid surprises when comparing contractor quotes.