Commercial kitchen hood installation is usually the single most expensive mechanical item in a restaurant build-out — and the one most likely to blow up a budget that was set before anyone looked at the ceiling. Here's what a hood system really costs in Seattle & King County, what the code requires, and the mistakes that quietly add weeks to an opening.
Type I vs. Type II: know which hood you actually need
Everything starts with what you cook. The International Mechanical Code splits hoods into two families:
- Type I — required over equipment that produces grease or smoke: fryers, griddles, charbroilers, woks, most ranges. Grease-rated duct, an exhaust fan, make-up air, and a fire-suppression system come with it.
- Type II — for heat and steam only: dishwashers, ovens with no grease load, some pasta cookers. No grease duct or suppression required, so it costs a fraction of a Type I.
The distinction matters because a menu change can move you from Type II to Type I. For example, adding a small fryer to a café concept can trigger a full Type I system. Decide the menu before you buy the hood, not after.
Commercial kitchen hood installation cost in 2026
For planning purposes in the Seattle area, these are realistic installed ranges:
- Type II hood, installed: roughly $4,000–$10,000 depending on size and duct run.
- Type I system, complete: roughly $20,000–$60,000+ for the hood, grease duct, exhaust fan, make-up air unit, fire suppression, and controls.
- Rule of thumb: $1,500–$4,000 per linear foot of Type I hood, all-in, depending on how hard the duct routing is.
What actually drives the price
The stainless box you see is often less than a third of a commercial kitchen hood installation budget. The rest lives above the ceiling:
- Duct routing. A straight shot through the roof is cheap. Snaking a welded grease duct past structure, other tenants, or a second floor is not.
- Roof work. Curbs, fan mounting, and structural reinforcement need a roofer and sometimes an engineer.
- Make-up air. Code requires you to replace the air you exhaust. A tempered make-up air unit is routinely $8,000–$20,000 installed — and it is the item first-time owners forget to budget.
- Fire suppression. A wet-chemical system, its piping, and the tie-in to gas shutoff and the alarm panel.
- Second-floor or mid-block spaces. If your kitchen has neighbors above it, expect the duct run to be the hardest problem in the project.
Permits and inspections in Seattle & King County
A Type I hood is never a handshake job. Your jurisdiction reviews the mechanical plans — hood, duct, fan, and make-up air — and the fire-suppression system is permitted and inspected separately, typically with the fire marshal witnessing the trip test. Health plan review from Public Health – Seattle & King County checks the hood against your equipment schedule, and contractors performing the work must be registered with Washington L&I. The U.S. Department of Energy also publishes useful guidance on ventilation and energy use — worth a read, because demand-control ventilation can cut fan energy costs meaningfully in a busy kitchen.
Because the hood touches mechanical, electrical, gas, fire, and health reviews at once, sequence matters. Our King County restaurant permit guide walks through the order that keeps reviews running in parallel instead of single-file.
Commercial kitchen hood installation mistakes to avoid
- Buying the hood before the layout is final. Hood size is driven by the cook line beneath it. Move one fryer and the hood, duct, and suppression nozzles all change. Our guide to commercial kitchen layout mistakes covers this in depth.
- Forgetting make-up air. The classic budget hole. Inspectors will not sign off without it.
- Used hoods without documentation. A secondhand hood can pass — but only with the listing intact and a suppression system matched to your equipment. Many don't survive review.
- Leasing a space that can't take a duct. Therefore, before you sign, have a contractor confirm there is a legal path from the cook line to the outside air.
This is exactly the kind of scope we manage end-to-end as part of a restaurant build-out — design, permits, installation, and the inspections in between.
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Book a Free ConsultationFrequently asked questions
How much does commercial kitchen hood installation cost?
In the Seattle area, a complete Type I system typically runs $20,000–$60,000+ installed, or roughly $1,500–$4,000 per linear foot. A steam-only Type II hood is far less, often $4,000–$10,000. Duct routing and make-up air drive the spread.
Do I need a permit to install a kitchen hood?
Yes. A Type I hood requires mechanical permits and plan review, a separate fire-suppression permit and test, and it appears in your health-department plan review. Unpermitted hoods are a common reason spaces fail at sale or inspection.
Can I reuse the hood that's already in the space?
Sometimes. It must be the right type and size for your cook line, properly listed, with a suppression system updated to match your equipment. Have it evaluated before you count on it — an undersized hood is a full replacement.
How long does hood installation take?
With approved plans, the physical install is usually one to two weeks. The schedule risk is upstream: fabrication lead times and permit review can each take several weeks, so the hood package should be one of the first things ordered.