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How Much Does Air Duct Replacement Cost in Seattle? [2025 Data]
Normal Range: $618 - $2,104
Air duct replacement in Seattle, WA, costs $618 to $2,104, with an average of $1,250. You’ll pay more for high-end materials or difficult access points. Reach out to a local HVAC pro for an accurate estimate.
How we get this data
cerro_photography / iStock Photography / Getty Images
cerro_photography / iStock Photography / Getty Images
Highlights
To estimate your air duct replacement costs in Seattle, a pro will consider the size of your house and other factors.
The bigger your home, the more you’ll pay for air duct replacement.
Your costs can increase if your ductwork is in an attic, crawl space, or other hard-to-access area.
Duct material is another cost factor, with sheet metal ducts being the priciest to replace.
Other expenses involved in this project include labor, permits, and sales tax.
Air duct replacement costs in Seattle commonly range from $618 to $2,104, with the average project costing about $1,250. Your overall cost will depend on the specifics of your ducts (including their type and location), as well as the size of your home. Let’s walk through these factors (and others) to help you create an accurate budget for air duct replacement in Seattle.
Air Duct Replacement Cost Factors
To figure out how much you’ll spend on air duct replacement in Seattle, WA, you’ll need to consider the size and layout of your house and the type of ducts you’re installing.
Size
The size of your home directly affects air duct replacement costs. Larger homes require more materials and labor to replace the entire duct system. On average, the cost ranges from $2,000 to $5,000 for a small- to medium-sized home. However, duct replacement can run as low as $1,400 for smaller homes and as high as $9,000 for larger homes. Here’s how the size of your home affects duct replacement costs:
| Home Size (Sq. Ft.) | Average Cost |
|---|---|
| 1,000–2,000 | $1,397–$4,491 |
| 2,000–3,000 | $2,794–$6,687 |
| 3,000–4,000 | $4,192–$8,982 |
Duct Location
If only specific sections of your ductwork need replacement, such as in a renovation project, costs will depend on the location of the damaged or worn ductwork. Replacing ducts in hard-to-reach or concealed areas—like attics, basements, ceilings, walls, or crawl spaces—can increase labor costs. Here’s how the location of the ducts could affect their cost:
| Location | Average Cost |
|---|---|
| Exposed | $699–$2,994 |
| Wall or ceiling | $998–$3,992 |
| Basement | $1,796–$3,094 |
| Attic | $2,196–$5,589 |
| Crawl space | $2,994–$7,285 |
Duct Material
The material you choose for your replacement ducts affects both their cost and longevity. The most common types of ducts in Seattle, WA, are flexible and metal.
Sheet metal ducts are durable but pricey. Flexible ducts, on the other hand, are more affordable but may need to be repaired or replaced sooner. Here’s a breakdown of air duct replacement costs based on duct material:
| Duct Material | Average Cost per Linear Foot | Pros | Cons |
|---|---|---|---|
| Flexible (non-insulated) | $1–$3 | Lowest-priced option | Not as energy efficient as other materials |
| Flexible (insulated) | $2–$4 | Simple installation | Prone to mold growth |
| Fiberboard | $4–$6 | Comes insulated | Poor airflow efficiency, less durable |
| Fiberglass | $4–$6 | Requires less support than flexible ductwork | Not suitable for small spaces |
| Sheet metal | $7–$13 | Lasts longest | Costly |
HVAC Pro Costs
Before finalizing your ductwork replacement budget, you’ll want to factor in a few final costs, including permits and taxes.
Licensing and Certification
Replacing ductwork requires a specialized set of skills and HVAC knowledge, so it’s important to hire a licensed and insured HVAC pro in Seattle, WA, for this type of work. When you’re interviewing candidates, ask about their background, qualifications, and any other credentials (like NATE certification) to make sure they have the right experience for the job.
Pro Tip
Quality ductwork will increase the efficiency of your HVAC, sometimes by 20% to 30%. This is because there is reduced air leakage due to better insulation and more optimized airflow. This means your HVAC doesn't have to work as hard to keep the desired temperature, so it uses less energy.
Permits
In Seattle, installing new mechanical equipment (such as heating and cooling systems) requires a mechanical permit. If permits are necessary for your project, your air duct installer should pull them for you and include the cost in their quote.
Sales Tax
Seattle’s 10.35% sales tax will apply if you purchase your ductwork or other project materials in the city. It might not blow your budget, but it will bump up your costs—especially if you choose a pricier type of ductwork (like sheet metal).
Does Air Duct Replacement Increase Home Value?
As a standalone project, replacing your air ducts won’t increase your home’s value dramatically. However, for buyers, a house with new ductwork is more appealing than one with worn-out or inefficient ducts. Also, if you add new ductwork while replacing the rest of your HVAC system, you could see a bigger rise in your property’s resale value—about 5% to 7%.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
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