Duct Sealing Cost

National cost range

Low end

$400

Simple access, like-for-like

Typical

$1,200

What most jobs come in at

High end

$2,800

Upgrades, difficult access, code work

What you are actually paying for

Find the row that matches your situation. Quotes that differ wildly from each other usually differ in scope, not in price.

What moves the price

In descending order of impact. These are also the questions worth asking a contractor whose quote sits outside the range above.

1. 1

   Method

   Manual mastic $400 to $1,500; aerosol Aeroseal $1,500 to $2,800.

2. 2

   Accessible ductwork

   Attic and crawl ducts are easier than enclosed wall chases.

3. 3

   Leak severity

   Blower door guided tests document 20–40% leakage typical.

4. 4

   Return leaks

   Pulling attic air into returns is common and costly to fix.

5. 5

   Testing

   Pre/post leakage test adds $150 to $300.

Direct answer

Duct Sealing in 2026 typically costs $400 to $2,800 nationwide, with planning figures near $1,200 for per home. Equipment tier, duct condition, and refrigerant type drive most of the spread—not contractor brand alone.

What each price band actually buys

Low end

Covers straightforward access, standard materials, and a single visit without major code-driven add-ons.

Typical

Mid-grade materials, normal business hours, and the access path described in the scenario table.

High end

Difficult access, emergency dispatch, structural or finish restoration, or code upgrades discovered during work.

Labor vs materials

Typical split for this job nationally: roughly 55% labor and 45% materials. Crew size is usually 1–2 HVAC technicians, across one service visit (2–8 hours).

What this price usually does not include

• Drywall, tile, or flooring restoration unless line-itemed
• Permit fees when a separate authority fee applies
• Water damage or mold remediation from prior leaks
• Relocation of unrelated fixtures or appliances
• Extended warranties sold at the counter
• Municipal connection fees beyond the property line

Hidden costs that show up on real jobs

Regional variation

HVAC labor and cooling-degree-day markets drive spread: Sun Belt install competition can sit near national median while Northeast and West Coast metros often run 20–30% higher for the same SEER2 tier. Compare quotes at `/home/cost/duct-sealing/[metro]` when published.

Code upgrades this job can trigger

• Mechanical permit and inspection on equipment replacement
• Refrigerant handling per EPA Section 608 on sealed systems
• Condensate drainage and disconnect requirements on new equipment

Repair vs replace

Repair makes sense when the existing component is otherwise sound and failure is isolated. Replacement is appropriate when corrosion, repeated failure, or code non-compliance affects safety or resale. Compare the repair quote to a new install with warranty before authorizing band-aid work on components past typical service life.

Timeline and visits

Most jobs schedule within a few days; emergency water or sewer issues may be same-day. Permit inspections add a separate visit when required.

Quote checklist — line items a fair bid should show

1. Labor versus materials line items
2. Fixture or equipment model numbers
3. Permit and inspection fees if applicable
4. What restoration is included after access
5. Warranty on parts and labor
6. Payment terms and change-order process
7. Start date and estimated on-site hours

Questions to ask before you sign

• Is this repair or full replacement, and what triggers the higher option?
• Will you pull the plumbing permit and meet the inspector?
• What is excluded if shutoff valves or venting fail inspection?
• How do you protect finished floors and walls during work?
• What warranty applies if the same issue returns within a year?
• Is disposal and haul-away included?

Quote red flags for this job

• Single lump sum with no scope or model numbers
• Refusal to pull a permit when local code requires one
• Price far below competitors with no explanation of excluded restoration
• Cash-only with no written warranty
• No plan for water shutoff or occupancy during work
• Pressure to replace entire systems without documenting the failure

Payment schedule norms

Service and small installs: payment on completion. Larger jobs: 25–33% deposit, balance at final inspection.

Can you do it yourself?

When this cannot wait

• Rooms never reach temperature
• High dust at supplies
• Energy bills spike with otherwise new equipment

Common questions