UseCalcPro
Home
MathFinanceHealthConstructionAutoPetsGardenCraftsFood & BrewingToolsSportsMarineEducationTravel
Blog
  1. Home
  2. Construction

Ductwork Installation Cost Calculator

Price a 2026 ductwork install or replacement by linear feet, duct material (flex, rigid metal, or ductboard), vent count, and region — then get 3 local HVAC contractor quotes.

Project Scope

Duct Runs

Duct Material

Location

Fill in the details and click Calculate

Fill in the details and click Calculate

Frequently Asked Questions

Q

How much does ductwork installation cost in 2026?

Full new install runs $6-$16 per linear foot, landing at $2,500-$8,000 for a typical 1,500-2,500 sqft home with 150-220 LF of trunk + branch and 8-12 vents. Replace-existing runs $4-$12/LF and $2,000-$6,500 for the same home because demo overlaps with install labor. Adding a single branch to an existing system runs $500-$2,000 flat. Labor is roughly 60-70% of total — regional rates swing the price 20-40% between South and Northeast or West Coast metros.

  • Full new install: $6-$16/LF ($2,500-$8,000 typical)
  • Replace existing: $4-$12/LF ($2,000-$6,500 typical)
  • Add single branch: $500-$2,000 flat
  • Rigid sheet metal: +40-60% vs flex
  • Labor share: ~60-70% of total
Scope$ per LF1,500-2,500 sqft home
Full new install (flex)$6-$12$2,500-$6,000
Full new install (rigid metal)$10-$16$4,500-$8,000
Replace existing (flex)$4-$10$2,000-$5,000
Replace existing (rigid metal)$8-$12$4,000-$6,500
Add branch or zoneflat fee$500-$2,000
Q

Flexible vs rigid metal vs ductboard — which should I choose?

Flexible insulated (flex) duct is the cheapest and most common at $1-$3/LF material; it is fast to install and handles residential airflow well. Rigid sheet metal costs 40-60% more installed because joints need hand-crimping and mastic sealing, but it moves more CFM with lower static pressure and lasts 30-50 years vs 15-25 for flex. Fiberboard (duct board) sits between the two and is quieter but harder to clean and prone to moisture damage in humid climates.

  • Flex: $1-$3/LF material, 15-25 year life
  • Rigid metal: +40-60% total, 30-50 year life
  • Ductboard: quieter, humidity-sensitive
  • Flex best for single-story residential
  • Rigid metal best for multi-story and high CFM
MaterialInstalled $/LFLifespanBest For
Flexible insulated$4-$815-25 yearsResidential, attics, crawl spaces
Rigid sheet metal$8-$1630-50 yearsMulti-story, high CFM, basements
Fiberboard / ductboard$5-$1020-30 yearsQuiet-sensitive, dry climates
Q

Do I need to replace ductwork when replacing the HVAC system?

Not always. If existing ducts are properly sized, sealed, and under 15 years old, most contractors reuse them. Replace when: ducts show mold or asbestos tape, leak more than 15% (measured by duct-blaster test), are sized for a smaller system, or the previous install used bare uninsulated metal in unconditioned space. Replacing ductwork during HVAC swap adds $2,000-$6,000 but saves 10-15% vs replacing it later because crews are already on site.

  • Reuse if under 15 years old + sealed
  • Replace if leak rate >15% per duct-blaster
  • Replace if mold, asbestos, or undersized
  • Combining with HVAC swap saves 10-15%
  • Duct-blaster test: $250-$500 diagnostic
Q

How much does adding a single duct run to a new room cost?

Adding one supply branch to an existing trunk runs $500-$2,000 installed. The range depends on distance from the plenum, whether drywall or ceiling needs to be cut and patched, and whether a return or just supply is added. A basement or attic run with open framing and a 15-20 ft trip from the plenum is the cheapest scenario; a finished second-floor room requiring ceiling cuts and drywall patch lands at the top of the range. Add another $80-$200 for the register/boot itself.

  • Simple attic or basement branch: $500-$900
  • Finished second-floor branch: $1,200-$2,000
  • Register / boot install: $80-$200 each
  • Drywall patch adds $200-$500
  • Long runs (30+ ft) add $150-$400
Q

What signs mean my ductwork needs replacement?

Replace ducts when you see: high utility bills with new HVAC equipment (leaky ducts), hot or cold rooms that will not balance, visible mold or rust at joints, asbestos tape (pre-1980 install), audible whistling or rattling, or ductwork from the original build on a 25+ year-old house. A duct-blaster test measuring leak rate is the gold-standard diagnostic — anything above 15% leak rate typically justifies replacement over repair for long-term savings.

  • High bills despite new HVAC = leak
  • Hot/cold rooms = sizing or leak issue
  • Asbestos tape (pre-1980) = abatement
  • Mold or rust at joints = replace
  • Leak rate >15% = replace not repair
Q

How do I get a fair ductwork quote?

Get 3 written quotes from licensed HVAC contractors. Each bid should itemize: total linear feet of trunk plus branch, duct material and R-value insulation, number of supplies and returns, sealing method (mastic vs UL-181 tape), demo and haul-off if replacing, and any drywall patch scope. Bids more than 20% below the pack usually skip sealing, under-size ducts, or leave demo for a change-order. Always confirm Manual J (load calc) and Manual D (duct sizing) are part of the scope.

  • Minimum 3 written quotes
  • Itemize LF, material, vents, sealing
  • Manual J + Manual D required
  • Confirm R-6 or R-8 insulation
  • >20% below pack = scope skip

Find an HVAC Technician Near You

Get free quotes from HVAC professionals near you

Angi
Angi4.7/5

Verified reviews & background checks

Get Free Quotes

Showing results for your area

Example Calculations

11,800 sqft full new install, flex duct, Midwest

Inputs

Project typeFull new install
Linear feet100 – 200 LF
MaterialFlexible insulated
Vents8 – 12
RegionMidwest

Result

Typical quote range$3,200 – $5,800

22,400 sqft replace-existing, rigid metal, Northeast

Inputs

Project typeReplace existing
Linear feet200 – 400 LF
MaterialRigid sheet metal
Vents12 – 16
RegionNortheast

Result

Typical quote range$7,500 – $12,000

3Add branch to new second-floor bedroom, South

Inputs

Project typeAdd branch or room
Linear feetUnder 100 LF
MaterialFlexible insulated
VentsUnder 8 (1 supply + 1 return)
RegionSouth

Result

Typical quote range$900 – $1,800

Formulas Used

Ductwork install cost breakdown

Quote = (LF × $/LF) + (Vent count × $80-$200) + Demo/Haul-off + Manual J+D fee

Ductwork quotes decompose into linear-foot run cost (material + labor for trunk and branches), per-register install, demolition and haul-off (replace-existing only), and engineering fees for Manual J (load calc) and Manual D (duct sizing). Labor is ~60-70% of total.

Where:

LF × $/LF= Flex $4-$8, rigid metal $8-$16, ductboard $5-$10 per installed LF
Vent install= $80-$200 per supply or return register/boot
Demo / Haul-off= $400-$1,500 flat when replacing existing ductwork
Manual J+D fee= $250-$600 engineering fee (sometimes included)

Ductwork Install Costs in 2026: What Homeowners Actually Pay

1

2026 Ductwork Install Costs: Per Linear Foot and Per Home

Residential ductwork installation runs $6-$16 per linear foot installed in 2026 for a full new install, with a typical 1,500-2,500 sqft home landing at $2,500-$8,000 when the job includes 150-220 linear feet of trunk plus branch runs and 8-12 supply and return registers. Replace-existing ductwork — tearing out the old system and installing a new one — runs $4-$12 per linear foot and $2,000-$6,500 for the same home size, because demo and install labor overlap for the crew on site. Adding a single branch or extending to a new room runs $500-$2,000 flat depending on distance from the plenum and whether finished drywall has to be cut and patched.

Labor accounts for roughly 60-70% of the total ductwork bill, which is why regional labor rates drive most of the variance you see between quotes. Northeast and West Coast metros run 20-40% above the national median — a $9/LF national average job lands at $11-$13/LF in Boston or Seattle. South and Plains markets run 15-25% below national. Material itself is the smaller share: flexible insulated duct costs $1-$3 per linear foot; rigid sheet metal costs $3-$6 per linear foot; ductboard sits between at $2-$4. Registers and boots add $80-$200 installed per vent.

Use the calculator above to price your specific project type, linear feet, material, and vent count combination. Then read on for the flex-vs-rigid-metal-vs-ductboard decision (which drives 40-60% of total cost), the signs that existing ductwork should be replaced rather than reused, and the scope traps in vague HVAC quotes. For the companion heating and cooling equipment costs that almost always accompany a duct project, the home renovation estimator puts ductwork scope in context with the full HVAC and remodel budget.

One number most homeowners miss: the per-vent install fee is separate from the per-linear-foot run cost, and it adds up fast on systems with 12+ registers. Each supply boot with register runs $80-$200 installed (steel boot $30-$60, decorative register $20-$80, labor to cut the drywall, snake the flex or duct takeoff, and balance airflow $30-$60). A 2,000 sqft home with 12 supplies and 2 returns carries $1,100-$2,800 just in register install labor beyond the trunk and branch linear-foot number — that is 20-35% of the total bill on a typical home. Bids that lump vents into a single linear-foot number without calling out per-register cost are hiding this line item and usually land 10-15% above peer quotes that are transparent about it.

Residential ductwork install cost by scope and material, US 2026. Source: HomeAdvisor, Angi, Forbes Home.
ScopeCost per LFTypical 1,500-2,500 sqft homeLifespan
Full new install (flex)$6-$12$2,500-$6,00015-25 years
Full new install (rigid metal)$10-$16$4,500-$8,00030-50 years
Replace existing (flex)$4-$10$2,000-$5,00015-25 years
Replace existing (rigid metal)$8-$12$4,000-$6,50030-50 years
Add single branchflat $500-$2,000$500-$2,000 per runmatches existing
2

Flex, Rigid Metal, or Ductboard: Picking the Right Material

Duct material is the single biggest cost lever after linear feet, and the choice matters for both upfront price and long-term performance. Flexible insulated duct — a wire-helix inner core wrapped in insulation and a plastic vapor barrier — is the default for most residential work. It runs $1-$3 per linear foot for material and $4-$8 installed. Flex is fast to route through attics and crawl spaces, handles the 400-800 CFM per branch that residential systems need, and carries a 15-25 year expected life when properly supported every 4-5 feet.

Rigid sheet metal costs $3-$6 per linear foot for material and $8-$16 installed because every joint has to be hand-crimped or snap-locked together and then sealed with mastic (or UL-181 listed tape). The labor premium of 40-60% buys a 30-50 year lifespan, lower static pressure loss (so your blower works less hard), and the ability to move more CFM through the same trunk cross-section. Rigid is the right choice for multi-story homes, high-CFM systems above 5 tons, basements where the trunk hangs exposed, and any situation where airflow predictability matters — like a home addition with zone dampers.

Fiberboard (duct board) is a sandwich of fiberglass insulation with a foil outer face, cut and stapled into rectangular sections on site. At $2-$4 per linear foot material and $5-$10 installed, it sits between flex and rigid on price and is noticeably quieter because the fiberglass absorbs blower noise. The downsides are real: fiberboard cannot be cleaned aggressively without damaging the inner surface, and it degrades in humid climates where condensation forms on the exterior. Most modern codes restrict fiberboard to supply-only runs and prohibit it in return-air plenums. For DIY rough-in quantity checks that pair with this install scope, the drywall install cost calculator handles the companion wall and ceiling patching trade.

Insulation R-value is a code-driven sub-decision inside the material choice. For ducts running through unconditioned space (attics, crawl spaces, garages), 2021 IECC requires R-6 minimum in most climate zones and R-8 in hot-humid zones 2A-3A and very-hot zones 1A-1B. Ducts inside conditioned space can use R-4.2 or uninsulated if mastic-sealed. Flex duct comes pre-rated at R-4.2, R-6, or R-8 from the factory — the R-8 premium is roughly $0.50-$1.00 extra per linear foot and usually pays back in 2-4 years through reduced duct heat loss. Rigid metal and ductboard are insulated on site with wrap or board, adding $1-$2 per linear foot to upgrade from R-6 to R-8.

Labor 40%Duct material 25%Registers 15%Sealing 10%Engineering 10%Anatomy of a ductwork bid (2026)
  • Flex: $4-$8/LF installed, 15-25 year life, residential standard
  • Rigid sheet metal: $8-$16/LF installed, 30-50 year life, multi-story
  • Ductboard: $5-$10/LF installed, 20-30 year life, quiet-sensitive rooms
  • R-value: code minimum R-6 unconditioned, R-8 in hot climates
  • Sealing: mastic beats tape; UL-181 rated only
  • Support spacing: flex every 4-5 ft, rigid every 8-10 ft
3

Reuse or Replace? When Existing Ductwork Has to Go

The biggest cost decision on an HVAC replacement is whether to reuse existing ductwork or rip it out with the furnace and AC. Reusing ducts typically saves $2,000-$6,000 on the total project because a 1-2 day duct job adds meaningfully to a 1-2 day equipment swap. Reuse is usually fine when: the existing system is under 15 years old, the original installer used insulated flex or rigid metal (not bare sheet metal in the attic), joints were sealed with mastic rather than cloth tape, and a duct-blaster test shows the total leak rate is under 15% of rated system airflow.

Replace when any of the following appear: cloth duct tape at joints (fails in 5-10 years and is the single most common leak source in houses built before 2005), asbestos-wrapped tape on metal seams (pre-1980 construction — this requires EPA-certified abatement and adds $1,500-$4,000), visible mold or rust, missing or compressed insulation in unconditioned attic/crawl space runs, or a duct-blaster measurement above 15% leak rate. Undersized ductwork for a larger new system is another hard replace — if a Manual D sizing calculation shows the existing trunk cannot carry the new equipment CFM, you will get warm or cold rooms no matter how good the new furnace is.

Combining duct replacement with HVAC equipment replacement saves 10-15% versus doing them in separate projects because crews are already on site, equipment is off the wall, and the drywall patch scope is consolidated into one finish pass. If you are planning a whole-home remodel, the home renovation estimator handles the multi-trade bundling, and the drywall install cost calculator prices the patch-and-paint scope that typically follows a replace-existing duct job.

Partial replacement is a middle-ground option that saves 30-40% versus full replacement when only certain runs are failing. Common partial-replacement scopes include: replacing only the attic runs (the harshest environment and usually the first to fail), replacing only the return-air trunk (often undersized in older homes and a major comfort complaint), or replacing only the branches feeding problem rooms while keeping the main trunk. A partial job runs $1,200-$3,500 for most homes and is the right call when a duct-blaster test isolates leaks to specific sections rather than showing system-wide failure. Ask the HVAC contractor to mark up the duct-blaster test report with zone-by-zone leak measurements so the scope can target the worst offenders.

When to reuse vs replace existing ductwork during HVAC replacement, 2026.
ConditionReuse or Replace?Cost Impact
Under 15 yrs, mastic-sealed flexReuseSaves $2,000-$6,000
Cloth tape at jointsReplace$2,000-$6,500 typical
Leak rate >15%Replace$2,000-$6,500 typical
Asbestos tape (pre-1980)Replace + abatement+$1,500-$4,000
Undersized per Manual DReplace$2,000-$6,500 typical
Visible mold or rustReplace$2,000-$6,500 typical

Duct-blaster test costs $250-$500 and is the single most-useful diagnostic before committing to reuse vs replace. Any legitimate HVAC bid that recommends reusing ductwork should include a duct-blaster measurement in the scope.

4

Adding a Branch: Extending Ductwork to a New Room

Adding a single supply run to a new or previously unconditioned room runs $500-$2,000 installed. The cheapest scenario is a basement or open-framed attic where the installer can route 15-20 feet of flex from the existing trunk to a new register boot without opening finished surfaces — that lands at $500-$900 including the register. A finished second-floor bedroom where the ceiling has to be cut, the flex run snaked through joists, and drywall patched and painted lands at $1,200-$2,000 with the register and boot included.

Before spending money on a new branch, verify that the existing HVAC equipment has spare capacity. A typical residential system is sized for the conditioned square footage at the time of install — adding 150-300 sqft of new space (attic conversion, bonus room, garage finish) often pushes the system past its Manual J load. If spare capacity is tight, the new branch will starve the rest of the home of airflow, creating hot or cold rooms elsewhere. A Manual J load calc (typically $250-$400 from a licensed HVAC contractor) answers this definitively before work begins.

Zone dampers and smart thermostat controls are a smart companion upgrade when adding a branch to an existing trunk. A basic 2-zone damper kit runs $600-$1,200 installed and lets you condition the new room independently of the rest of the home, which solves the uneven-temperature problem that often triggers the branch addition in the first place. For broader multi-trade addition scope, the home renovation estimator bundles the framing, insulation, drywall, and HVAC branch into a single budget.

Register and boot selection matters more than homeowners expect. A stamped-steel register boot with throttle damper runs $40-$80; a solid-brass or powder-coated decorative register adds another $40-$120 on top. Cheap registers ($15-$25 each) warp, rattle, and leak conditioned air around the edge of the boot — over 10 years that wasted airflow often costs more in utility bills than the upgrade register would have cost at install time. Ask your installer which register model they spec and whether it includes a damper lever for manual balancing; that feature alone is worth $15-$25 extra per vent if your home has multi-story airflow imbalance.

  1. 1

    Step 1 — Manual J check

    Confirm existing HVAC has spare capacity for the new room. $250-$400 load calc from a licensed contractor.

  2. 2

    Step 2 — Pick the route

    Shortest open-framing path from trunk to new boot location. Every 10 ft of added length adds $50-$150.

  3. 3

    Step 3 — Install trunk tap + flex run

    New collar on existing trunk, run insulated flex to the boot, support every 4-5 ft to prevent sagging.

  4. 4

    Step 4 — Boot + register

    $80-$200 total for the boot + decorative register with damper lever for balancing.

  5. 5

    Step 5 — Drywall patch + balance

    Patch ceiling or wall cut ($200-$500), then balance airflow between new and existing rooms at the registers.

5

Five Ways to Cut Your Ductwork Bill Without Compromising Airflow

First lever: bundle ductwork with the HVAC equipment swap. Crews charge a single mobilization and share drywall patch scope, saving 10-15% versus doing them in separate projects. If the existing equipment has 1-2 years left, it is usually worth pulling that swap forward to capture the bundled savings, especially when the existing ducts show cloth tape or any of the replace-now triggers. Second: reuse the existing layout where possible. Cutting new trunk paths through finished framing is the single most expensive part of a replace-existing job — if the old layout works, reusing the route saves $800-$2,000.

Third lever: pick flex over rigid metal for single-story homes unless there is a specific CFM or static-pressure reason to spend the premium. On a 1,800 sqft ranch with a 3-ton system, rigid metal adds $2,000-$3,500 to the total and delivers lifespan benefits that rarely pay back before the next HVAC replacement anyway. Fourth: request Manual J load calculation and Manual D duct sizing in writing before accepting any bid. Contractors who refuse or charge extra for this engineering are either undersizing or oversizing — both lead to callbacks and comfort complaints that cost more than the engineering fee. A proper Manual J+D adds $250-$600 to the bid but eliminates 80% of post-install problems.

Fifth lever: schedule in shoulder season. HVAC contractors charge 5-15% premium during June-August cooling calls and December-February heating emergencies. March-May and September-October are the cheapest windows and give crews time to do careful sealing work rather than rushing through a callback queue. Combining with other improvements like the attic insulation calculator for R-value upgrades helps reduce load before sizing ductwork, which occasionally lets you step down one equipment tonnage and save $800-$2,000 on the equipment itself.

One more sanity check before signing: confirm the sealing method line-item in writing. Code-compliant ductwork uses mastic paste (not cloth duct tape, despite the name) or UL-181 listed foil tape on every joint. A bid that lists sealing vaguely or leaves it off entirely is where corners get cut; proper sealing takes 1-2 hours per 100 linear feet and adds 4-8% to the total labor but cuts leak rate from 15-20% down to 3-5%. That tighter envelope saves the homeowner 10-20% on heating and cooling bills every year — the sealing line-item pays back in under 3 years and is where amateur vs pro crews most visibly differ.

  1. 1

    Step 1 — Bundle with HVAC swap

    Saves 10-15% vs separate projects through shared mobilization and drywall patch scope.

  2. 2

    Step 2 — Reuse existing layout

    Keep the old trunk route if it sizes correctly. Saves $800-$2,000 on finished-framing cuts.

  3. 3

    Step 3 — Flex over rigid metal (single-story)

    Skip the rigid-metal premium on ranches and small homes. Saves $2,000-$3,500.

  4. 4

    Step 4 — Require Manual J + D

    $250-$600 engineering fee. Prevents 80% of post-install comfort callbacks.

  5. 5

    Step 5 — Shoulder-season scheduling

    Book March-May or September-October. 5-15% cheaper than peak season.

Related Calculators

HVAC System Install Cost

Price the furnace and AC unit side-by-side with ductwork — they are usually bid together.

Central AC Install Cost

Cooling-only scope — pairs with existing furnace and reused or replaced ductwork.

Furnace Install Cost

Heating-only scope — gas or electric furnace replacement with duct reuse or upgrade.

Attic Insulation Install Cost

Insulate the attic where ducts often live — reduces duct heat-loss and sizing needs.

Countertop Installation Cost Calculator

Estimate 2026 countertop installation cost by linear feet, material, and edge. Quartz, granite, and marble quotes typically run $2,000 to $6,500 installed.

Gutter Installation Cost Calculator \u2014 2026 Aluminum, Copper & Seamless

Estimate 2026 gutter installation cost by home size, material, and stories. Aluminum, copper, and seamless jobs typically run $900 to $5,200 nationwide.

Related Resources

How Much Does Central AC Installation Cost in 2026? (Full Pricing Guide)

Read our guide

How Much Does Crown Molding Cost in 2026? (National Averages & Real Pricing)

Read our guide

How Much Does Gutter Installation Cost in 2026? (National Averages & Real Pricing)

Read our guide

HVAC System Install Cost

Central AC Install Cost

Furnace Install Cost

Attic Insulation Calculator

Home Renovation Estimator

Explore Construction Calculators

Price materials and labor for HVAC, insulation, drywall, and whole-home renovation projects.

View All Construction Calculators

Last Updated: Apr 18, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

UseCalcPro
FinanceHealthMath

© 2026 UseCalcPro