Dryer Vent Repair, Replacement & Rerouting

Cleaning restores a good duct. Some ducts were never good. A share of the vent runs in this area's housing stock — especially remodel-era retrofits — are crushed behind drywall, pieced together from taped scraps, run in ribbed foil that code no longer allows for concealed use, or simply routed so badly that no amount of cleaning keeps them flowing. Those need repair, and we handle both jobs in one visit when that is what the inspection finds.

What fails, and how it gets fixed

Crushed or kinked sections. A duct flattened during a past remodel or by settling framing throttles airflow permanently. Fix: replace the section with smooth-wall rigid metal, properly supported.

Separated joints. Duct sections pull apart inside walls and floors, quietly blowing hot, lint-loaded air into the cavity — a moisture problem and, per the U.S. Fire Administration's Topical Fire Report Series, exactly the kind of failure a cleaning schedule alone cannot fix (the agency counts an estimated 2,900 home clothes dryer fires a year, with failure to clean or maintain the vent as the leading contributing factor). Fix: reconnect, seal with foil tape (never screws, which snag lint), and secure.

Foil and fabric duct. Common in mid-century installs and cheap flips. The concealed run gets replaced with 4-inch smooth-wall metal; the short visible transition behind the dryer can stay semi-rigid.

Bad terminations. Hoods with fine screens (a lint trap and, for dryers, a code violation), flaps painted shut, or terminations into a soffit, attic, or crawl space — which building code flatly prohibits. Fix: a proper dryer-rated hood, relocated if the original spot was wrong.

Roof vs. sidewall terminations. A roof termination that keeps failing — a hood that blows loose, flashing that leaks, ice damming around the boot — sometimes gets rerouted to a sidewall exit instead, where the framing allows it; sidewall replacements are also simply faster and cheaper to reach. Where a roof exit is the only option, the fix is a proper roof-rated hood and correctly resealed flashing, not a patch. Why upstairs laundry and roof terminations fail more often is worth reading before deciding between the two.

Over-length runs. Ducts stretched well past what the dryer's own fan can push air through — see the code section below for what "too long" actually means. Where rerouting cannot shorten the path, a listed booster fan keeps a long run legal and functional.

What the code actually requires

Dryer exhaust ducts are governed by Section M1502 of the International Residential Code (IRC) for one- and two-family homes, and by the parallel Section 504 of the International Mechanical Code (IMC) for larger buildings — the same body of model code, adopted village by village with its own edition and amendments. A few core requirements are consistent across recent editions: the concealed run must be smooth-wall rigid metal, at least 0.0157 inch thick — flexible foil and vinyl duct are not permitted there, only for the short transition hose behind the dryer, which itself cannot exceed 8 feet and cannot be concealed inside a wall or floor — see foil, semi-rigid, or smooth metal for what each material is actually rated to do. Total duct length is capped — in the 2021 edition, at 35 feet from the dryer connection to the outdoor termination — and that maximum is reduced for every elbow in the run; the 2021 edition's own table lists a 2.5-foot deduction for each 4-inch 45-degree elbow and a 5-foot deduction for each 4-inch 90-degree elbow.

Those specific deduction figures are what the 2021 IRC and IMC use; other adopted editions carry similar but not always identical numbers, and our seven suburbs are not all on the same edition — for example, Skokie and Lincolnwood have adopted the 2021 IMC, Niles the 2024 IMC, Glenview the 2021 IRC, and Morton Grove the 2018 IMC. See your suburb page for the edition your specific village has adopted, and confirm current requirements with the village before scheduling any work that changes the duct's length or path.

Repair or replace: how to decide

This is the genuinely useful question, and it depends on how much of the run is actually compromised versus how much is isolated damage in an otherwise sound duct.

Repair usually makes sense when the duct is mostly rigid metal and mostly sound, with one isolated failure — a single separated joint, one crushed section from a remodel, a termination hood that failed. Fixing that one point costs less than tearing out a working duct.

Replacement usually makes sense when the run is foil or vinyl for most or all of its length, has multiple separate failure points, or the routing itself is the problem — too many elbows, too long to fix with a booster fan, or buried somewhere no future repair could reach without opening the wall again. Patching a duct that is wrong in its fundamentals costs money now and again later; replacing it once, correctly, is usually the cheaper path over time.

The inspection is what actually answers this for your house — not a guess over the phone. We trace the full run, identify the material and every failure point, and give you a firm quote for the repair, the replacement, or both, before anything gets cut.

The one-visit workflow

Every repair starts the way a cleaning does: we locate the full run, measure airflow, and quote firm. A single-point fix — a joint, a hose, a hood — usually takes under an hour once we're on site; a full concealed-run replacement typically runs half a day to a full day depending on length and access. If the duct is sound, you pay only for the cleaning. If it is not, we give you the repair quote before anyone cuts anything — with photos of the problem, so you are deciding on evidence rather than a pitch.

What it costs

Simple fixes typically run $100 to $300 — resealing a joint, replacing a transition hose, remounting a hood. Full run replacements are quoted per job, normally landing in the $140 to $600 range depending on how much duct has to come out, though the most complex, longest reroutes can run as high as $1,000. What moves the number within and beyond that range:

How much duct has to be replaced. One section costs less than the full concealed run.

Access. A basement joist bay with removable panels is faster to open than a finished wall or a tight crawl space.

Termination type. Roof work costs more than sidewall work — ladder time and flashing add labor.

Whether the fix triggers a permit. A reroute that counts as mechanical work under your village's adopted code adds the permit process to the job — our village-by-village permit guide covers which of ours require what.

These figures come from Angi's dryer vent installation and replacement cost data, localized to this market. We confirm your number in writing before starting. Cleaning is a separate, far more common service that costs less — see dryer vent cleaning for the full breakdown by where your vent terminates. Questions before you request a quote? Contact us directly.

Services in the near-north suburbs

Vent repair is one piece of what we cover. See dryer vent cleaning if the duct just needs clearing rather than fixing, bird nest removal if a spring nest is the actual blockage, and air duct cleaning if the question is your home's HVAC system rather than the dryer exhaust. Our advice library covers questions like when a vent problem is really an appliance problem.

Where we cover this service

We cover the near-north suburbs. Pick your town for pricing notes and housing-stock details specific to it:

Frequently asked questions

How much does dryer vent repair cost?

Simple fixes — resealing a separated joint, replacing a torn transition hose, remounting a loose termination hood — typically run $100 to $300, per Angi's dryer vent cost data. A full concealed-run replacement or reroute is quoted per job, because it depends on total length, elbow count, and how much wall or floor has to be opened; that work normally falls in the $140 to $600 range, though the most complex, longest reroutes can run as high as $1,000. Cleaning — a separate, more common service — costs less, and its own page breaks the cost down further by where your vent terminates. We quote your specific job firm before starting.

How do I know I need a repair and not just a cleaning?

The tell is what cleaning does not fix. If airflow stays weak after a verified cleaning, if lint turns up in a wall cavity, attic, or crawl space, or if the exterior flap barely moves even with a clear duct, exhaust is escaping somewhere it should not — a crushed section, a separated joint, or a bad termination. A cleaning restores a duct that is dirty; it cannot fix one that is damaged, undersized, or routed wrong.

Do I need a permit to repair or replace a dryer vent?

It depends what is being done. Routine repair of an existing run — resealing a joint, swapping a damaged section for the same size and path — is generally treated as maintenance in the villages we cover, with no permit required. Rerouting the path or extending the run is mechanical work under the International Residential Code or International Mechanical Code edition your village has adopted, and that typically does need a permit. Editions and local amendments vary by village — see your suburb page for the specific code your village has adopted, and confirm with the village before scheduling anything beyond a straightforward repair.

How long does a dryer vent repair take?

A single-point fix — a joint, a transition hose, a termination hood — usually takes under an hour once we're on site. A full concealed-run replacement or reroute is a bigger job: opening a section of wall or floor, running new rigid duct, and closing it back up typically takes half a day to a full day depending on length and access. We give you a time estimate along with the firm quote before anyone starts cutting.

Can flexible foil duct be replaced without opening the walls?

Usually only where the foil sits somewhere reachable without demolition — a basement joist bay with removable panels, an open crawl space, or the short visible run behind the dryer. Foil buried inside finished walls or a floor cavity generally requires opening drywall or flooring to reach it, because it has to come out in full and be replaced with rigid metal duct end to end, not patched in place. The inspection tells you which situation you are in before anyone writes a quote.

What is a dryer vent booster fan, and do I actually need one?

A booster fan is a code-listed inline blower installed partway along a duct run that is too long to move air on its own, adding the airflow the dryer's own fan cannot supply over distance. It is a genuine fix for a run that cannot be shortened or rerouted — not a workaround for a duct that is simply dirty or crushed. If a shorter path exists, rerouting is usually the better and cheaper fix; a booster fan earns its cost specifically when the layout of the house leaves no shorter option.

Does replacing a roof termination cost more than a sidewall one?

Generally yes. A roof termination means ladder work, roofing-safe flashing and resealing around the new hood, and more time on site, all of which push a repair toward the higher end of the range. A sidewall termination near grade is faster and cheaper to reach and replace. If your home has a roof termination that keeps failing, ask us whether rerouting to a sidewall exit is possible — it is not always, but where it is, it can cost less over time than repeated roof repairs.

Is dryer vent repair the landlord's responsibility, or mine?

For rentals, dryer vent condition generally falls under the landlord's maintenance obligations the same as any other exhaust or mechanical system, though the specifics depend on the lease. For condos, it depends on the association's declaration: the portion of duct inside your unit is often the owner's responsibility, while a shared chase or vertical run serving multiple units is often a common element the association maintains — but that split is not universal, and declarations vary. Check your lease or declaration, or ask the association directly, before assuming who pays.

Can I repair a damaged dryer vent myself?

Some of it, cautiously. Reseating a loose transition hose or replacing an exterior hood you can reach from a ladder is within range for a comfortable DIYer, using code-listed parts. Opening a wall or floor to replace a concealed section, rerouting a path, or working at a second-story or roof termination is not — it requires matching code-compliant materials, sealing methods that will not just trap lint again, and, for roof work, fall protection most homeowners do not have on hand. If the inspection shows the problem is concealed, that is the point where calling us in is worth it.

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