How Much Does New Ductwork Cost?
New ductwork in a Frederick home usually costs $2,000 to $6,000 or more. A small ranch with short, simple runs sits near the low end. A larger two-story house with many rooms, tight crawl spaces, or a full redesign pushes toward the top — and sometimes past it. Price depends on home size, how much old duct comes out, the material used, and how hard the space is to reach. A partial repair costs far less than a whole-home replacement. The numbers below break down what each scope typically runs.
What new ductwork costs by scope of work
| Scope of work | Typical cost |
|---|---|
| Small home, full replacement (under 1,500 sq ft) | $2,000–$3,500 |
| Mid-size home, full replacement (1,500–2,500 sq ft) | $3,500–$5,000 |
| Large or two-story home, full replacement | $5,000–$6,000+ |
| Partial replacement (one zone or damaged section) | $1,000–$2,500 |
| Adding a single new duct run | $300–$1,200 |
| Full redesign with resizing and new returns | $6,000–$10,000+ |
What drives the price up or down
Home size sets the baseline. More square footage means more supply runs, more returns, and more material — so a large house costs more than a small one, even before anything unusual. Material matters too: flexible duct is cheaper to install than rigid sheet metal, though your contractor may recommend one over the other for the layout. Access is the wildcard. Ducts buried in a tight crawl space or a low attic take longer to reach and replace, which raises labor on any ductwork service in Frederick.
Removing old duct adds cost, especially if it holds insulation or sits in a hard spot. Labor is usually the largest single line on the bill, since duct work is slow and physical. Frederick County also requires a mechanical permit for a full replacement, and that fee and inspection get folded into the quote. A tight, well-planned job can trim hours, but rushing the design usually costs more later.
- Flexible duct installs faster and cheaper than rigid sheet metal in most homes.
- Crawl spaces and low attics add labor hours that show up in the price.
- Frederick County permits and inspection are part of a full-replacement quote.
When ductwork is worth the cost
A full replacement makes sense when the whole system leaks, sags, or was sized wrong from the start. If only one crushed or disconnected section is the problem, a partial repair costs far less and still fixes it. The signs you need new ductwork help you tell which situation you are in before you pay for more than you need.
Sealing is the cheapest option of all. If your ducts are sound but leak air at the joints, sealing them can cut waste without a full rebuild. Comparing duct sealing vs. replacement is the fastest way to match the fix to the real problem — and to avoid spending $5,000 when a $700 seal would do.
- Full replacement fits homes with system-wide leaks or wrong-sized ducts.
- Partial repair handles one crushed or disconnected run for far less.
- Sealing sound-but-leaky ducts often beats paying for a rebuild.
Questions homeowners ask next
How Much Does New Ductwork Cost?
Most Frederick homes pay $2,000 to $6,000 or more for new ductwork. Small homes with easy access sit near the low end, while large or multi-story homes with a full redesign reach the top. Home size, material, and access difficulty drive the price.
Is it cheaper to repair or replace ductwork?
Repairing one damaged section is far cheaper — often $1,000 to $2,500 — than replacing the whole system. Full replacement only pays off when ducts leak system-wide, sag, or were sized wrong. A technician can tell you which your home needs.
Does new ductwork lower energy bills?
It can. Leaky or undersized ducts waste heated and cooled air, so a tight new system often trims monthly bills. The savings depend on how bad the old ducts were and how well the new ones are sized and sealed.