How much does new ductwork cost in Virginia?

There is no dependable statewide price for new ductwork. What a job costs depends on how much duct is replaced, where it runs, what it is made of, and what your city or county requires for permits and testing. The useful questions are whether you need new ducts at all, and what a fair written quote should include.

First, do you need new ducts?

Often the problem is leaks, not the ducts themselves. In a typical house, about 20 to 30 percent of the air that moves through the duct system is lost to leaks, holes and poorly connected ducts,^[1] and leaky ducts can reduce heating and cooling efficiency by as much as 20 percent.^[2] ENERGY STAR says sealing and insulating ducts can often pay for itself in energy savings.^[2]

Sealing and repair usually cost less than replacement because the ducts stay in place. Replacement comes into it when sections are crushed, collapsed or disconnected beyond repair, when the layout never delivered enough air, or when insulation is wet or moldy. When a new system goes in, a contractor checking your ducts may advise that some need to be replaced or added.^[4]

What drives the price

How much is replaced. A few feet of flex duct in an attic, a new return for one bedroom, and a whole-house duct system are three different jobs. Ask for the scope in feet of duct, number of runs and number of registers so quotes can be compared.

Where the ducts run. Because ducts are often concealed in walls, ceilings, attics and basements, repairing them can be difficult.^[1] An open basement is the easiest case. A tight crawlspace, a low attic, or ducts inside finished walls and ceilings add labor and sometimes drywall repair.

What they are made of. Flex duct is a round, flexible duct with a plastic liner surrounded by insulation; it goes in easily but can be inefficient and difficult to seal if installed incorrectly.^[5] Rigid ductboard is rectangular, foil covered and lined with fiberglass.^[5] Round galvanized steel ducts wrapped in insulation with a vapor barrier are the preferred choice in Virginia Cooperative Extension's guide, because they have less friction than flex duct and ductboard, so they move air better.^[5]

Insulation. ENERGY STAR says a contractor should insulate ducts in unconditioned areas with duct insulation that carries an R-value of 6 or higher.^[3]

Returns and design. Many systems have air return ducts that are too small.^[3] Fixing that, or designing a new layout room by room, takes time that a quick swap does not.

Permits, design paperwork and testing. Spotsylvania County's mechanical application, updated in August 2025, lists a residential trade permit at $147.00 per trade, made up of $100.00 plus a 2% building surcharge and a $45 processing fee; that is its general residential fee for each trade, not a separate ductwork line.^[6] For a new unit installed in an existing single-family home, the form requires an HVAC system design worksheet, covering loads, equipment and ducts, if new ductwork is installed because the home never had a unit or the system is all new after fire damage.^[6] Its form offers post-construction or rough-in duct testing by an approved testing agency.^[6] Other localities set their own fees and rules.

Diagnostics and safety checks. Blower door, duct blaster and pressure pan tests can find leaks a homeowner cannot easily see.^[5] In a home with gas or oil equipment, ENERGY STAR expects a combustion safety test after the ducts are sealed.^[3]

Asbestos in older homes. Asbestos-containing materials in a heating and cooling system, such as insulation and register boots, need specialized procedures and should be disturbed or removed only by trained and equipped contractors.^[7] Testing and abatement are a separate cost from the duct work.

Where the money comes back

Good ducts can lower the price of the next system. ENERGY STAR notes that a well-designed and sealed duct system may let you downsize to a smaller, less costly heating and cooling system.^[2] If you are replacing equipment soon, price the duct work and the system together.

Help for qualifying households

Dominion Energy's Income and Age Qualifying Energy Savings Program provides no-cost energy assessments and upgrades to eligible customers in its Virginia service territory, and lists duct sealing among the measures it currently offers at no cost.^[8] Statewide, DHCD's Weatherization Assistance Program, run through local nonprofit providers, lists repairing drafty duct systems among its typical services.^[9]

What a good quote includes

Licensing applies to duct work of any size. Virginia licenses heating, ventilation and air conditioning as a trade,^[11] and an individual doing that work for the public must hold a tradesman licence or work under the supervision of a licensed tradesman in the specialty, whatever the size of the job.^[10] A contracting business taking a job worth more than $1,000 also needs at least a Class C contractor licence,^[12] and the Board for Contractors requires a master tradesman licence for an HVAC contractor.^[12] Beyond the licence, ENERGY STAR's guide says a signed agreement should list in detail all the work, specify all products by quantity, name, model number and energy rating, give the warranty information and payment schedule, state the start and completion dates, and outline the paperwork and permits.^[4]

For ducts, also ask for:

• separate prices for sealing, repairs, new runs, insulation, testing and the permit
• the duct material and insulation rating for each section
• whether leakage and airflow will be measured before and after
• who pulls the permit and books the inspections
• what happens if asbestos or wet insulation turns up

Stop and call a pro if

• Any duct needs to be added, moved or replaced; that is contractor work, and your building department can tell you whether it needs a permit. See whether you need a permit to replace ductwork in Virginia.
• The ducts are inside finished walls or ceilings.
• You find old wrap or tape on the ducts that might contain asbestos, or insulation that is wet or moldy.
• The house has gas or oil equipment and the job will tighten the ducts.

Related

To do the sealing yourself, see how to seal leaky air ducts. If the ducts are part of a bigger replacement, read how much a new HVAC system costs in Virginia. Browse heating and cooling services, find HVAC businesses in Blacksburg, or read more heating and cooling answers.

To compare real numbers for your house, describe the duct job once and licensed local HVAC businesses quote it. On Loclis, HVAC work needs a licence at any job size, and an unlicensed quote is refused.