A room went cold after the fit-out
The partition moved and the duct did not, or the run was cut and capped by a trade who was not thinking about air. Very common in a converted retail unit.
Heating & Cooling10,702 businesses licensed for it
Ductwork repair and balancing
When one room is unusable and the rest of the building is fine, the equipment is usually working and the duct is not. Work covers disconnected or crushed flex runs above ceilings, sealing leaking joints, replacing damaged sheet metal, adding or repairing dampers, and balancing the system so the air actually arrives where people are. Fit-outs are the usual cause: a wall goes up, the duct never gets moved.
Enter your ZIP to see the businesses listed for this trade nearest to your site, with their phone numbers.
- Free to searchno account, nothing to submit
- Public registersevery listing names its source
- License numberswhere the state publishes one
- Directyou call the business yourself
- Our estimate
- $260-$4,500
- Time on site
- 2-10 hrs
- Fault patterns covered
- 2
- Licensed for this trade itself
- 10,702
What ductwork repair and balancing costs
Most of these jobs land near $680. The full spread runs $260 to $4,500, and the gap between those two ends is diagnosis against replacement rather than one business being dearer than another.
What moves it: how much of the job is parts, whether the fault is found in the first hour or the third, access to the equipment, and the hour of the day you call. We never speak to the businesses listed here, so there is no rate card behind any of this. It is our own band for the category, and there is no regional index: the figure does not change with your metro.
| How soon you need it | Typical | Range |
|---|---|---|
| Scheduled visitBooked in advance, no urgency multiplier applied | $680 | $260 to $4,500 |
| Same dayOur band multiplied by 1.12 | $760 | $290 to $5,040 |
| Emergency calloutOur band multiplied by 1.35 | $920 | $350 to $6,075 |
Our estimate from national cost bands, not a quote from any business. Every row is the same band with the urgency multiplier the site applies everywhere else, so this table can never contradict the headline number. Ask for a written price before the work starts.
Who is licensed to do this work
In California the classification that squarely covers this is C-20 warm-air heating, ventilating and air-conditioning, and the register says who holds it. Every listing on this site shows the classification, the license number and the date we read it, with a link back to the register entry so you can check it against the state rather than against us.
Overlapping classifications exist and are labeled as overlapping rather than as a match: C-38 refrigeration, C-4 boiler, hot water heating and steam fitting, C-43 sheet metal and D-62 air and water balancing. A general building contractor may hold the job and subcontract the trade, which is a real answer and a different one, so the card says which of the two you are looking at.
One thing worth being plain about: CSLB classifications do not distinguish commercial work from residential. There is no separate commercial license to hold and no register field that would prove one. That is why this page describes the equipment rather than the contractor, and why nothing here says a business has been checked out. We read a public record on a stated date. That is the whole claim.
Before you pay for a callout
Two minutes of checks that sometimes end the problem
We would rather you did not need a callout at all. These are the checks that end the most calls for this fault.
Try a quick fix first
Some issues resolve without a truck roll. Two minutes now can save the callout.
- 1
Hold a sheet of paper at each vent and note which ones move it. A room with no airflow at all is a disconnected run; a room with weak airflow everywhere is a system problem instead.
- 2
Push up a ceiling tile near the failing vent and look. A flex duct lying on the ceiling grid where somebody bumped it is a common and very cheap find.
- 3
List every room that is wrong before anyone arrives. Balancing is a whole-system job and doing it one room at a time costs more.
What the visit actually includes
- Airflow readings at each affected register
- Above-ceiling inspection of the runs involved
- Reconnection, replacement or repair of damaged duct
- Joint sealing and insulation reinstatement
- Damper adjustment and a balancing pass across the zone
Diagnosis
How ductwork faults usually present
Written from how these faults actually present on a working premises, not from a manual.
Whistling or roaring at a grille
Too much air through too small an opening, usually because dampers elsewhere were closed to fix a different complaint. Balancing solves it properly.
Listed for this trade
Businesses listed for ductwork
Read from public license registers, so there is no ranking here and no distance: this page has no location to measure from. Enter your ZIP to sort by who is nearest to your site.
By location
Ductwork repair and balancing near you
Local pages show which businesses are listed for that metro, how far out they sit, and the local conditions that drive demand.
Counted from the businesses we have imported for each metro center inside a 25 mile radius, and counting only those whose own license classification names this trade. General contractors licensed widely enough to take it on and subcontract it are excluded here, and still appear in a search. A metro reads “none yet” until we load a register that covers this trade there.
All coverage areasQuestions owners ask
Ductwork FAQs
Short, specific answers. If yours is not here, ask the business you call before you agree to the visit.
Is duct cleaning the same as duct repair?
No. Cleaning removes dust from the inside of the duct and is not a licensed trade. Repair, replacement and balancing are sheet metal and air conditioning work, C-20 and C-43 in California.
Will sealing the ducts save money?
In an attic or a plenum ceiling, yes, because air escaping into an unconditioned space is air you paid to condition. The saving depends entirely on how leaky the system was to start with.
Do I need a balancing report?
For a single hot room, no. If you are commissioning a new fit-out or arguing with a landlord about capacity, a measured report is what settles it.
Related work
Often booked in the same visit
Batching jobs into one mobilization is the cheapest way to buy this kind of work.
Rooftop HVACRTU not cooling or heating, tripping breakers, noisy fans and belt failures.from $260Commercial ACWarm air from the vents, weak airflow, condensate leaks and thermostat faults.from $190Commercial heatingNo heat, short cycling, ignition lockouts and unit heater failures.from $210Split systemOutdoor condenser and indoor head faults, error codes, icing and drain leaks.from $200
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Ready when you are
Need ductwork sorted?
Search your ZIP to see the businesses listed for this trade nearest to your site, with the license numbers and phone numbers we hold, then call them yourself.
- Cost to search
- Free
- Account needed
- None
- Who you call
- The business