How Much Does It Cost to Replace Ductwork?
"How much will this cost?" is usually the first question we get once a homeowner finds out their ductwork is the problem — whether it's leaking, undersized, or just old enough that it's time. The honest answer is "it depends," but that's not very useful, so here's a realistic breakdown of what drives the price up or down.
| Scope | Typical cost range | Notes |
|---|---|---|
| Sealing accessible joints/connections | $200 – $800 | Good first step if leaks are the main issue |
| Partial replacement (1-3 runs) | $300 – $2,000 | Common for damaged or disconnected sections |
| Full ductwork replacement, small home | $3,000 – $6,000 | Single story, accessible attic |
| Full ductwork replacement, larger/2-story home | $6,000 – $10,000+ | More runs, harder access, longer labor time |
| Resizing/redesign with new AC install | Varies | Often bundled into installation pricing |
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What drives the cost
A few factors move the number more than anything else:
- Home size and number of duct runs — more rooms means more supply runs, fittings, and total material.
- Accessibility — ductwork in an open, walkable attic is faster (and cheaper) to replace than ductwork crammed into tight crawlspaces or finished ceilings.
- Material — flex duct is generally less expensive than rigid sheet metal, but sheet metal can last longer and hold up better in extreme attic temperatures.
- How much needs replacing — a single damaged run is a very different job than replacing an entire duct system.
Partial vs. full replacement
If an inspection finds that most of your ductwork is in reasonable shape but one or two sections are damaged, disconnected, or crushed, partial replacement is usually the right call — it's faster and far less expensive. Here's how to spot the signs that point to a localized problem versus a system-wide one.
Full replacement makes more sense when ductwork is old, undersized for the home, or has widespread leaks, sagging, or insulation that has degraded throughout the attic.
Replacing ductwork with a new AC
If you're already getting quotes for a new AC system, it's worth asking your technician to evaluate the ductwork at the same time. Ductwork sized for a system installed 15-20 years ago may not be the right size for newer, more efficient equipment, and addressing both at once can be more cost-effective than doing them separately later.
Getting an accurate quote
Because the cost depends so much on what's actually going on above your ceiling, the only way to get a real number is an in-person inspection. We'll look at your existing ductwork, check for leaks and damage, and give you a written quote that breaks down exactly what's being recommended and why — no surprises.
Ready for a real number?
We'll inspect your ductwork and give you an honest, written quote.
📞 Call (850) 235-8834Frequently asked questions
How much does it cost to replace ductwork in a house?
For a full ductwork replacement in an average single-family home, costs commonly range from about $3,000 to $10,000 or more, depending on home size, duct material, accessibility, and how much of the system needs to be replaced.
Can I replace just part of my ductwork?
Yes. Partial replacement of damaged or leaking sections is common and usually costs a few hundred to a couple thousand dollars depending on how much ductwork is involved and how accessible it is.
Do I need new ductwork when I replace my AC?
Not always, but it is common for ductwork sized for an old system to be undersized or leaky for a new one. A technician can evaluate your existing ductwork during an AC replacement quote and let you know if it needs to be resized, repaired, or replaced.
How long does ductwork last?
Properly installed ductwork can last 15-25 years or more, but flex duct in hot attics tends to degrade faster than rigid sheet metal, especially if insulation has compressed or the outer vapor barrier has torn.