Hood/Exhaust Ventilation System Permit in Seattle, Washington (2026)
Without a Hood/Exhaust Ventilation System Permit from the Seattle Department of Construction & Inspections (DACI), your restaurant cannot legally operate cooking equipment that produces grease, smoke, or steam — and you risk immediate shutdown orders and fines if your hood system isn't permitted before you start cooking. This permit (also called a commercial kitchen ventilation approval) certifies that your exhaust hood, ductwork, and makeup air system comply with Seattle's mechanical code and fire safety standards. Key facts:
- 117 fields total — ApronPrep auto-fills 97 of them
- $0 government filing fee in Seattle
- Timeline varies based on inspection scheduling and system complexity
Analyzed from Hood/Exhaust Ventilation System Permit
83% from one compliance interview
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Why You Need a Hood/Exhaust Ventilation System Permit
You are legally required to obtain a Hood/Exhaust Ventilation System Permit from the Seattle Department of Construction and Inspections (SDCI) before installing, altering, or replacing any commercial kitchen ventilation system. This permit ensures your system complies with the Washington State Building Code (WSBC), specifically the mechanical (WSBC Chapter 15) and fire code (WSBC Chapter 9) sections, which are adopted and enforced locally by Seattle. The system must also meet Seattle's own building ordinances and the Washington State Accessibility Code (Chapter 51-19 WAC) for any related structural or access modifications. Without this permit, your restaurant's most critical fire and life safety system lacks official approval.
Proceeding without a permit triggers immediate enforcement actions and creates significant long-term liabilities. Based on SDCI's standard enforcement protocols, common consequences include:
- Stop-Work Orders: All construction halts immediately, delaying your opening or remodel by weeks or months until the violation is corrected and fines are paid.
- Denial of Final CertificatesCertificate of Occupancy or Fire Final, legally preventing you from opening your doors to the public.
- Costly Corrections & Fines: You may be required to partially or fully demolish non-compliant work for re-inspection. SDCI assesses daily monetary penalties for non-compliance, which escalate the longer the violation persists.
- Lease and Insurance Violations
Legal code: State building code (locally administered), local building ordinances, state accessibility code
Recent update: In 2026, the SDCI updated its online portal to require more detailed equipment specification sheets for all mechanical permit applications to improve first-pass review rates.
Who Needs a Hood/Exhaust Ventilation System Permit?
| Type | Required | Notes |
|---|---|---|
| Restaurant (Full-Service) | Required | Required under Seattle Mechanical Code (SMC Chapter 15) for any commercial kitchen with cooking appliances that produce grease-laden vapors. |
| Bar / Nightclub | Not Required | Not typically required unless the establishment has a kitchen with cooking appliances; a permit for general exhaust may be needed instead per SMC 15.11. |
| Food Truck | Required | Required as it is a mobile food unit with cooking equipment; governed by the same Seattle Mechanical Code standards as fixed establishments. |
| Coffee Shop / Café | Not Required | Often exempt if only using equipment like espresso machines or toasters that do not produce grease-laden vapors, as defined by SMC 15.04. |
See which restaurant types need this requirement — and which don't.
See Full Requirements →Field-by-Field Guide (117 Fields)
97 of 117 auto-filledFlashing Provided - Yes
checkboxCheck this box if approved, non‑combustible flashing is installed where the exhaust duct penetrates an exterior wall or roof, to prevent water intrusion and ensure a weather‑tight seal per Seattle Mechanical Code § 504.9.
COMMON MISTAKE: Checking 'Yes' without verifying the flashing is installed and rated for the penetration, which can lead to a correction notice after the on‑site inspection.
Flashing Provided - No
checkboxCheck this box if flashing is not yet installed; you must note this on the plans and ensure the contractor installs it before the final inspection.
COMMON MISTAKE: Checking 'No' for a penetration that already exists, which may cause the plan reviewer to flag the application as incomplete.
Exception to Cleanout Requirements Taken
checkboxCheck only if your design uses an alternate cleanout method approved under Seattle Mechanical Code § 505.4 (e.g., for ducts under 6" in diameter) and you have documented the exception justification.
COMMON MISTAKE: Checking this box without a valid, documented code exception, which will result in an automatic plan review rejection.
Clearance from Combustible Construction
checkboxCheck this box to confirm the hood and duct maintain the minimum required clearance (typically 18 inches) from any combustible material, as specified in Seattle Fire Code § 904.
COMMON MISTAKE: Checking this box without verifying actual clearances on submitted plans, leading to field inspection failures.
Clearance from Combustible Construction (Alternate)
checkboxCheck this box if using an approved alternate clearance method (e.g., listed insulation or shielding) that has been pre‑approved by the Seattle Department of Construction and Inspections (SDCI).
COMMON MISTAKE: Selecting an 'Alternate' method without prior SDCI approval or proper documentation on the plans.
Clearance from Combustible Construction (Alternate 2)
checkboxCheck this box only if a second, specific alternate clearance solution (per Seattle Fire Code § 904.11.3) is documented and approved for your installation.
COMMON MISTAKE: Incorrectly selecting this option for a standard installation, which signals a non‑compliant design to the reviewer.
Effective Damper Opening Selected
checkboxCheck this box to confirm the backdraft damper's effective open area has been calculated and meets the required free area per Seattle Mechanical Code § 507.2 for maintaining design airflow.
COMMON MISTAKE: Checking this without performing the damper free‑area calculation, which can cause the system to fail the performance test.
Duct Size Calculation Selected
checkboxCheck this box to affirm that duct sizing has been calculated per ACCA Manual D or equivalent standard to achieve the minimum transport velocity (typically 1,800 FPM for grease) required by Seattle Mechanical Code § 503.
COMMON MISTAKE: Selecting this without the supporting calculations on the plans, which is a common reason for plan review correction requests.
Listed Heat Recovery Device
checkboxCheck this box if your system includes a UL‑listed or equivalently certified heat recovery device to meet Seattle Energy Code § C403.2.9 requirements for energy recovery.
COMMON MISTAKE: Checking this for a non‑listed device, which will fail the mechanical/energy plan review and require resubmission.
Demand Control Ventilation (DCV)
checkboxCheck this box if your makeup air system uses sensors to modulate airflow based on occupancy or cooking load, as allowed per Seattle Energy Code § C403.2.7 to reduce energy use.
COMMON MISTAKE: Selecting DCV without providing the control sequence description and sensor locations on the plans, leading to a review hold.
ApronPrep auto-fills 97 of 117 fields from a single compliance interview — no re-typing, no guessing what the government expects.
Top 5 Hood/Exhaust Ventilation System Permit Mistakes
1. Submitting Unsealed or Non-Compliant Drawings
Submitting drawings without a Washington State-licensed mechanical engineer's seal, or that don't show the entire fire suppression system. The Seattle Department of Construction & Inspections (SDCI) immediately rejects these applications because they cannot verify code compliance. Example: Submitting a basic layout sketch instead of a full mechanical plan with UL-rated hood dimensions, duct runs, and fire suppression agent locations. This adds 2–3 weeks while you hire an engineer and redraw plans.
2. Incorrect CFM (Cubic Feet per Minute) or Hood Type Calculation
Miscalculating the exhaust CFM required for your cooking appliances or selecting the wrong hood classification (Type I for grease-producing equipment, Type II for steam/heat). An underpowered system fails inspection. Example: Installing a 1,200 CFM hood for a 48-inch charbroiler that requires 1,800 CFM per Seattle Mechanical Code Table 506.3.2. This leads to a failed final inspection and costly retrofitting, delaying your opening by 3–4 weeks.
3. Omitting Fire Suppression System Details & Interconnections
Failing to submit the fire suppression manufacturer's cut sheet, the NFPA 17A/96 compliance certificate, and the wiring diagram showing the system's interlock with the exhaust fan and gas/electric supply. Inspectors cannot verify life-safety compliance without this. Example: Listing 'Ansul system' without providing the specific model R-102 data sheet or showing the automatic shutdown wiring. This causes plan review comments and adds 1–2 weeks for resubmission.
Skip the Paperwork on Your Hood/Exhaust Ventilation System Permit
ApronPrep auto-fills 97 of 117 fields from one compliance interview.
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Hood/Exhaust Ventilation System Permit by City in Washington
| City | Fee Range | Timeline |
|---|---|---|
| Seattle | ||
| Spokane | ||
| Tacoma | Contact Tacoma Fire Department for permit fee schedule | Contact Fire Prevention Bureau for processing timeline |
Timeline: Varies
Prepare Hood/Exhaust System Design & Documentation
Gather or commission your hood and exhaust ventilation system design from a licensed mechanical engineer or HVAC contractor. You'll need detailed plans showing duct routing, makeup air specifications, fire suppression integration (if required), and compliance with Seattle Mechanical Code sections 501–507. Seattle requires UL-listed or FM-approved components. Have ready: equipment specifications, NFPA 96 compliance documentation, and proof that your contractor is licensed with the Washington State Department of Labor & Industries. Most restaurants underestimate this step — incomplete plans are the #1 cause of resubmission delays.
Complete Hood/Exhaust Ventilation System Permit Application (Form HES-01)
Fill out the City of Seattle Hood/Exhaust System permit application with your restaurant's legal name, physical address, tenant status (owner or lessee), hood dimensions, CFM (cubic feet per minute) rating, and exhaust ductwork routing. ApronPrep auto-fills your business entity information and address from your EIN data — you provide the technical specs. The form has 28 required fields; ApronPrep pre-populates 12. Attach your sealed mechanical design plans, fire suppression certification (if applicable), and proof of contractor licensing. Submit online via the City of Seattle's Department of Construction & Inspections (SDCI) permit portal or in person at the Development Services Center.
Pay Application & Permit Fees; Receive Application Number
Submit payment for the hood/exhaust system permit. Seattle's permit fees are calculated based on project valuation and hood size; typical fees range from $200–$800 for restaurant hood systems (per the SDCI fee schedule, updated annually). You'll receive a permit application number immediately upon online submission or receipt of your paper application. Save this number — you'll use it to track review status and obtain inspections. Government filing fees are non-refundable. Verify current fees on the SDCI website before submitting.
Where to Apply
Applications are handled by your local building department in each city. Select your city below for authority details, fees, and processing timeline.
Other Requirements You'll Need
This is one of 13 requirements for opening a restaurant in Washington.
ADA Compliance Self-Certification
federal
Alarm System Permit/Registration
local
Annual Report Filing
state
Application for Employer Identification Number
federal
See all co-required forms and how they connect to your compliance dossier.
See All RequirementsProcessing timelines vary depending on the complexity of your ventilation system design and whether your initial submission requires revisions, per the Seattle Department of Construction & Inspections (SDCI) permit processing standards. Standard review typically takes 2–4 weeks for complete applications, though projects requiring additional engineering review or modifications can extend to 6–8 weeks. Contact SDCI to confirm the current processing timeline for your specific project scope.
Seattle does not charge a separate filing fee for hood/exhaust ventilation system permits — the cost is included as part of your Building Permit application, per the SDCI fee schedule. However, you may incur additional costs for required design reviews, engineer stamps, or plan corrections if your initial submission is rejected. Contact SDCI to confirm any project-specific fees before submitting your application. Not legal advice — verify current fees with the Seattle Department of Construction & Inspections.
No — hood/exhaust ventilation system permits are location-specific and tied to the building and space where the system is installed, per Seattle Municipal Code § 22.206. If you relocate your restaurant, you must apply for a new permit for the new location's ventilation system. You may be able to salvage equipment from your old system, but the new location will require its own design review and approval process through SDCI.
Hood/exhaust ventilation system permits do not require periodic renewal — once approved and installed, the permit remains valid for the life of the system at that location, per SDCI regulations. However, if you modify your system (add equipment, change ductwork, upgrade fans), you must submit a modification request or new permit application. You are required to maintain annual Backflow Prevention Device Certification and comply with regular health and fire inspections, which are separate from the initial permit.
SDCI inspectors verify that your installed system matches the approved design plans, complies with Seattle building and energy codes, and meets all ventilation airflow requirements for your cooking equipment, per Seattle Municipal Code § 22.206. The inspector will test makeup air systems, check duct connections, verify fire suppression compliance, and confirm that the system exhaust terminates properly per code. If deficiencies are found, you'll receive a correction notice and must schedule a re-inspection after corrections are completed — typically adding 1–2 weeks to your timeline.
About This Data
This guide is generated from ApronPrep's compliance dossier system, which uses 53 parallel AI authority experts to discover requirements, then downloads actual forms and generates field-level intelligence for each one.
For Washington specifically, we have analyzed compliance dossiers for 3 cities (Seattle, Spokane, Tacoma), generating Rich FILs (Form Intelligence Layers) with 117 form fields analyzed for this requirement. Fee data is sourced from actual county department fee schedules, not estimates.
Our data is verified against official government sources and updated when regulatory changes are detected. If you find an error, please report it — accuracy is our core commitment.
Sources
- State building code (locally administered), local building ordinances, state accessibility code
- Seattle — Building Department / Inspectional Services
- Spokane — Building Department / Inspectional Services
- Tacoma — Building Department / Inspectional Services
This Form Is One of 60+ Requirements.
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