What permits do you need to open a auto repair shop in King County?

Industrial Waste Discharge Permit / Authorization

A business that sends process wastewater from manufacturing, remediation, cleaning or rinsing to the King County metropolitan sewer needs discharge approval from the King County Industrial Waste Program, regardless of whether it sits inside a city or in the unincorporated area, wherever that city's sewer flows to the county system. Issuance fees range from $1,500 (letter of authorization, new) through $2,000 (minor discharge authorization) and $3,000 (major) to $6,000-$12,000 for a discharge permit, with lower renewal and revision fees; approvals last up to five years. Regulated facilities also pay an annual compliance monitoring fee by tier and, for high-strength food and beverage wastewater, a surcharge of $0.4890 per pound of BOD and $0.5675 per pound of suspended solids (2026). No King County code section calls ordinary restaurant kitchen and restroom discharge an automatic exemption: KCC §28.82.260 defines a 'domestic user' only as one contributing wastewater from a residential dwelling unit, so a business is never itself a domestic user, and §28.82.380 defines industrial waste to include waste from commercial food processing and other business processes. Whether a specific restaurant's or auto shop's discharge crosses into industrial waste — as opposed to ordinary sanitary use that needs no authorization — is a judgment KCIW makes case by case; call 206-477-5300 rather than assuming either answer. Non-categorical dischargers must apply at least 60 days before discharge begins, and federal categorical dischargers at least 90 days before.

Zoning Variance

A zoning variance in unincorporated King County costs $13,266 for review and $483 for an extension of approval in 2026. This is the 2026 fee schedule; King County Code sets a lower fee ($11,610 review, $423 extension) effective January 1, 2027, unless the Council adopts a new fee ordinance first (one was due to the Council by October 1, 2026). Confirm the current fee with King County Permits, (206) 296-6600, after January 2027.

Auto Repair Shop — County License Touchpoints (King County)

The County's business-license list and Title 6 name no automotive repair shop license as such, so this record carries no fee. A repair garage that deals in used or remanufactured parts or tires needs the $40 secondhand dealer's license in the unincorporated area, and one that buys or stores scrap or salvage may need a junk shop license instead. Fire-code operational permits, plumbing permits (in Seattle, Clyde Hill and unincorporated King County), on-site sewage approval, and, for process wastewater from cleaning or rinsing, Industrial Waste Program approval, can all apply. Automotive repair and body work are barred as home occupations in the R, UR, NB, CB and RB zones (KCC 21A.30.080.E.1-2), though not in the A, F and RA zones. The trade credential itself is the state Motor Vehicle Repair Dealer license, recorded at the state layer.

Junk Shop / Junk Wagon License

A business in unincorporated King County where scrap metal or other junk — old rope, iron, brass, copper, tin, lead, rags, bottles, paper, bagging and other worn-out or discarded material — is bought, received or stored needs a $300-a-year junk shop license; a vehicle collecting junk door to door needs a $40 junk wagon license instead. Purchases by automobile wreckers who buy vehicles with a certificate of title are excluded from the junk-shop definition. Applications are reviewed by the Sheriff's Office and by Permitting. This Title 6 fee is fixed in the code and is not affected by the Local Services fee schedule that expires January 1, 2027.

Automotive Repair Shop Licensing — Washington Auto Repair Act (RCW 46.71)

No fee applies. The Auto Repair Act statute, RCW chapter 46.71, covers estimates, invoices, replaced parts, required signs, liens and unlawful practices across its fifteen sections and requires no license, registration, permit, bond or fee of a repair shop. Its one license provision is optional: RCW 46.71.100 lets any automotive repair facility apply for a transporter's license under chapter 46.76 RCW to evaluate vehicles on public roads before or after repair. The Act reaches repair shops instead through RCW 46.71.090, under which the Department of Revenue gives written notice of the Act's requirements when it issues a shop's business tax registration certificate. What the Act does require is conduct: a written estimate above $100, no charge over 110 per cent of it without further authorisation, replaced parts returned on request, a posted customer-rights sign, and the loss of your possessory lien if you do not comply.

Shared with other businesses in King County

• Fire Code Operational Permit (annual, unincorporated King County) — King County Fire Marshal's Office (Permitting Division), with delegated fire districts for operational-permit inspection, $171 per code item, initial permit; renewal $114 per item; building occupancy inspection $419 per building per site visit (2026), annual. Also required for restaurants, retail stores, childcare centres, fitness studios, veterinary clinics and salons and barbers; what it involves is set out on the retail stores page.
• Conditional Use Permit — King County Department of Local Services, Permitting Division, $6,487–$18,106 per application by category: residential or home industry $6,487; commercial $13,266; industrial, institutional or other $18,106 (2026), one-time. Also required for restaurants, retail stores, childcare centres, fitness studios, veterinary clinics and salons and barbers; what it involves is set out on the fitness studios page.
• Secondhand Dealer's License — King County Department of Local Services, Permitting Division, $40 a year, calendar year; payable December 31 for the following year; prorated quarterly. Also required for retail stores; what it involves is set out on the retail stores page.