2026 HVAC Cost Estimator
Ductwork Replacement Cost Calculator
Calculate accurate ductwork replacement costs based on your home size, duct material, number of runs, access difficulty, and HVAC contractor labor rates. Instant itemized estimates for full or partial duct system replacements.
Common Project Presets (Click to Load)
Estimated Ductwork Replacement Cost
$4,850
Typical Range: $4,268 – $5,578
Professional HVAC Estimate
Est. Duct Linear Footage
185 lin ft
Total Registers
12 Supply + 3 Return
Est. Crew Days
2 – 3 Days
Cost Per Lin Ft
$26/ft
Duct Material & Fittings Galvanized Sheet Metal
$2,220
Insulation Wrapping R-6 Fiberglass Wrap
$480
Old Duct Removal & Disposal Full System Strip-Out
$520
HVAC Installation Labor Licensed HVAC Contractor
$1,980
Sealing, Upgrades & Accessories Mastic Sealant
$350
Total Ductwork Estimate
$4,850
Related Home Improvement Guides
Ductwork replacement is often paired with roof, insulation, and HVAC system upgrades. Explore these companion guides to plan your full project:
Roofing Calculator →
Estimate shingles, metal, and slate roofing costs. Attic ductwork is often replaced when the roof is open.
EuroShield Roofing Problems →
Considering eco-friendly rubber shingles? Understand the issues before pairing with attic duct upgrades.
SkyLift Roof Riser Alternatives →
Planning a patio cover that intersects your roofline? Ensure ductwork routing stays clear of new framing.
Ductwork Replacement Costs by Material & Home Size
The table below shows 2026 national averages for full duct system replacement, including labor, insulation, and basic sealing. Costs assume standard access (unfinished basement or accessible attic):
| Duct Material | Cost Per Lin Ft | 1,200 Sq Ft Home | 2,000 Sq Ft Home | 3,000 Sq Ft Home |
|---|---|---|---|---|
| Insulated Flex Duct | $18 – $28 | $1,800 – $3,200 | $2,800 – $4,800 | $4,200 – $7,400 |
| Galvanized Sheet Metal | $35 – $55 | $3,200 – $5,500 | $4,500 – $8,200 | $6,800 – $12,500 |
| Fiberglass Duct Board | $22 – $38 | $2,200 – $4,000 | $3,200 – $5,800 | $4,800 – $8,800 |
| Spiral Round Metal | $45 – $75 | $4,200 – $7,200 | $6,000 – $11,000 | $9,200 – $16,800 |
Access Difficulty: The Biggest Hidden Cost Driver
- Open Basement (1.0x): Exposed ceiling joists provide full visual and physical access to trunk lines and branch take-offs. Fastest and cheapest installation scenario.
- Crawlspace (1.25x): Technicians work on their backs in 18″ to 36″ clearance. Requires mechanical exhaust fans and often a vapor barrier. Adds 25% to labor.
- Attic (1.35x): Hot, confined, and requires careful balance on ceiling joists. Insulation must be temporarily removed and reinstalled. 35% labor increase.
- Between Finished Floors (1.65x): Ductwork trapped inside finished soffits and wall chases requires strategic drywall cuts, fish-tape threading, and subsequent drywall patching. 65% labor premium.
- Slab Re-Route (1.85x): Homes with in-slab duct systems (common in 1960s–1980s construction) often develop groundwater intrusion and mold. The entire duct system is abandoned in place, sealed off, and a new overhead system is routed through the attic. Near-doubling of labor hours.
Frequently Asked Questions
The national average cost to fully replace residential ductwork ranges from $2,500 to $7,500 for a typical 1,500 to 2,500 square foot home, with most homeowners spending between $3,800 and $5,500. Costs depend heavily on duct material (sheet metal vs. flex duct), total linear footage, number of supply and return runs, access difficulty (open basement vs. sealed attic vs. between floors), and whether insulation wrapping is included.
Common signs include uneven room temperatures, excessive dust buildup on registers, visible rust or corrosion on exposed metal ducts, audible rattling or whistling noises during HVAC operation, musty or moldy odors from supply vents, utility bills rising despite a functional furnace and AC, and ductwork older than 15 to 20 years. A professional duct leakage test (duct blaster) can confirm whether your system is losing more than the acceptable 4% to 6% of total airflow.
Galvanized sheet metal ductwork is more durable, supports higher static pressure, lasts 25 to 30+ years, and is easier to clean professionally. Flexible (flex) duct is significantly cheaper and faster to install but can restrict airflow if kinked, sagged, or run in excessively long unsupported spans. Most HVAC engineers recommend rigid sheet metal for main trunk lines and plenums, with short flex duct runs (under 10 feet) for final branch connections to ceiling registers.
A full ductwork replacement in a single-story home with open basement or crawlspace access typically takes a 2-person HVAC crew 2 to 3 days. A two-story home with attic-routed trunk lines and between-floor branch runs can take 3 to 5 days. Homes built on concrete slab foundations with ductwork embedded in the slab may require 5 to 7 days due to demolition, re-routing through the attic, and drywall restoration.
In many homes, yes. If existing ductwork runs through accessible attics, basements, or crawlspaces, HVAC technicians can disconnect old ducts and thread new flex or sheet metal runs through existing wall and ceiling chases without drywall removal. However, if ducts are sealed inside finished wall cavities or soffits, limited drywall cuts and patches will be necessary, typically adding $300 to $800 in drywall repair costs.