Ductwork Installation in Seattle, WA
Custom sheet metal ductwork fabricated and installed serving Capitol Hill, Ballard, West Seattle, and all of Seattle. No subcontractors, all permits pulled, built to exceed WA code.
Your Seattle Ductwork Specialists
Seattle homeowners in Capitol Hill, Ballard, and West Seattle often discover that ductwork is the silent culprit behind comfort and efficiency problems. Even newer homes in Seattle can have ductwork problems: builder-grade installs frequently use undersized trunk lines, excessive flex duct, kinks at takeoffs, and unsealed boots. The result is hot rooms, cold rooms, high energy bills, and HVAC equipment running harder than it should.
Coastal homes in Seattle face an additional ductwork challenge: marine moisture migrates through unsealed ducts and can lead to mold growth in crawl spaces, condensation on cold supply runs, and accelerated metal corrosion. Sealing and insulating ducts isn't optional in Seattle — it's preventive maintenance. Whether you're replacing a failing furnace and want ducts sized to match the new equipment, adding cooling to a heating-only home, building an addition, or simply tired of one room being 8 degrees off the rest of the house, ductwork is where comfort actually happens. We fabricate our own sheet metal in-house — no subcontractors, no shortcut materials — and pull every permit King County requires.
Varsity Heating and Cooling specializes in ductwork that works WITH your HVAC system, not against it. We perform Manual D load calculations, balance airflow across every register, seal every joint with mastic (not tape), and insulate everything in unconditioned space. The result: equipment that hits its rated efficiency, every room comfortable, and energy bills that reflect what you're paying for.
Ductwork Services for Seattle Homes
Why Seattle Homeowners Choose Us
Fast Response
Based in Federal Way, we reach Seattle quickly for ductwork inspections and estimates. Most ductwork projects are scheduled within a week of approval.
Know Local Codes
We handle King County permits and inspections for every ductwork install in Seattle. Licensed (VARSIHC766RJ), insured, and compliant with all Washington State mechanical codes — including IMC and energy-code requirements.
Understand Local Homes
From Craftsman bungalows from the 1910s-1920s to newer construction, we know how Seattle homes were originally ducted and where existing systems typically fall short.
Ductwork Challenges for Seattle Homes
Even newer homes in Seattle can suffer from "builder special" ductwork — flex duct kinked behind sheetrock, undersized return air paths, and sloppy boot connections that leak conditioned air into walls and attics. Just because the home is new doesn't mean the ductwork is right.
Aerosol duct sealing, manual sealing with mastic, and proper R-8 insulation in unconditioned space are non-negotiable parts of every ductwork project we do in Seattle. We don't tape seams — tape fails. We don't use undersized return air paths — they starve the blower. We do it right or we don't do it.
For Seattle homeowners building additions, finishing basements, or adding bonus rooms above garages, ductwork extension is rarely a simple "add a register" job. New runs need to be load-calculated, balanced against existing rooms, and connected with proper takeoffs. We treat additions as a chance to fix existing imbalance, not just stretch the existing system thin.
Whether you need a complete duct replacement in Capitol Hill, a custom-fabricated trunk line for a new heat pump in Ballard, or just a real diagnosis of why one room never warms up, Varsity Heating and Cooling brings sheet metal craftsmanship and HVAC engineering together. We provide free in-home assessments with written estimates — and we'll show you exactly what's wrong before we propose a fix.
Quick Facts
“Vlad and his team were extremely professional. Constant communication, clean workmanship, and reasonable pricing.”
— Darius T., Federal Way, WA
Ductwork Questions from Seattle Homeowners
Ductwork projects in Seattle typically range from $3,450 to $9,200, depending on scope. A partial replacement of a few crushed or leaking runs is at the lower end. A complete custom-fabricated duct system for a 2,000-3,000 sq ft home with all-new trunk lines, mastic sealing, and R-8 insulation is at the higher end. We provide free in-home assessments with written, itemized estimates.
Yes, King County requires a mechanical permit for ductwork installation in Seattle. Varsity Heating and Cooling handles all permitting and inspections as part of our installation service, so you don't have to worry about paperwork.
Most ductwork projects in Seattle take 1-3 days. A targeted replacement of a few problem runs is often a one-day job. A complete duct system replacement paired with a new furnace or heat pump install runs 2-3 days, including commissioning and balancing. We schedule to minimize disruption and always leave your home clean.
Almost always, the cause is ductwork: undersized supply, missing or unbalanced damper, kinked flex duct, leaky takeoff, or no return air path. We diagnose the actual cause with manometer readings and airflow measurements — not guesses — and propose the smallest fix that actually solves the problem.
We fabricate our own galvanized sheet metal trunk lines, plenums, and transition fittings. We use rigid metal supply runs wherever possible and limit flex duct to short, properly supported connections at registers. All joints are sealed with mastic (not tape). All ducts in unconditioned space (attics, crawl spaces) are insulated to R-8 minimum. No subcontractors and no shortcut materials.
Often, yes — at minimum, you should have it inspected. A new high-efficiency furnace or variable-speed heat pump can lose 20-30% of its rated performance through leaky, undersized, or improperly sealed ductwork. If your existing ducts are 25+ years old, leaking visibly, or were sized for a smaller previous unit, it's almost always worth replacing or modifying them as part of the equipment install.
Ductwork Near Seattle
Ready for a Free Ductwork Estimate in Seattle?
Honest pricing on ductwork installation, replacement, and modification — fabricated by our own sheet metal crew.