Williams, CA Building Permit Guide

Permit Authority

Applies within the incorporated City of Williams, Colusa County, California. Separate county or special-district permits may still apply for health, fire, utility, or environmental matters.

Department

City of Williams Building Department

Address

810 E Street, P.O. Box 310, Williams, CA 95987

Phone

(530) 235-3270

Email

stapia@cityofwilliams.org

Website

https://www.cityofwilliams.org/services/building/index.php

Online Permit Portal

Application Process

1. Confirm the project is not on the city's Work Exempt From Permit list. If it is not listed as exempt, the city instructs applicants to assume a building permit is required.
2. Open the iWorQ Building Permit Application and select the property record that matches the job site.
3. Select the contractor record. The form requires a contractor match unless the applicant is proceeding as an owner-builder under the city's owner-builder declaration.
4. Complete the applicant or contact fields and project details, including permit type, description of work, square footage, valuation, and whether the work involves an existing structure or secondary dwelling.
5. Upload the required supporting documents, including plans and any project-specific declarations or affidavits.
6. Submit the application through iWorQ and coordinate follow-up with the Building Department. The city asks applicants to call for appointments because walk-ins cannot be guaranteed.
7. Keep the permit active after issuance. The portal states permits become invalid if work does not start within 180 days, if work is suspended or abandoned for 180 days, or if no inspections occur for 180 days; extensions must be requested in writing with justifiable cause.

Source: City of Williams Building Department

General Requirements

The city's Work Exempt From Permit handout says that if a project does not appear on the exempt-work list, applicants should assume a building permit is required.

Required Documents

• Construction plans drawn to scale
• Wet signatures from the designer on all drawing pages
• Signed truss-review statement when trusses are used
• Wet-signed and stamped structural calculations when engineered
• Plot plan with APN, dimensions, setbacks, utilities, streets, and easements
• Floor plan
• Foundation and floor framing plan
• Exterior elevations
• Owner-builder declaration when applicable
• Workers' compensation declaration when applicable
• Smoke and carbon monoxide affidavit when applicable
• Asbestos notification statement when applicable
• Special inspector form when applicable

Permit validity

The building permit application states the permit becomes invalid unless work starts within 180 days of issuance, if work is suspended or abandoned for 180 days after starting, or if there are no inspections for 180 days. Written extension requests may be submitted for justifiable cause.

Building code

Publicly posted city materials are inconsistent. The city ordinance index includes an older ordinance description adopting the 2013 California Building Standards Code, while a current city smoke and carbon monoxide affidavit still references the 2016 California Building Code, 2016 California Residential Code, and 2016 California Fire Code. Verify the currently adopted Title 24 cycle directly with the Building Department before relying on a specific edition.

Owner-builder

The city's owner-builder declaration cites Business and Professions Code sections 7031.5 and 7044. It allows owner-builders either to perform the work themselves or through their own employees if the improvement is not intended or offered for sale, or to contract exclusively with properly licensed contractors.

Contractor requirements

The portal requires a contractor selection and contractor license number. The city also links applicants to CSLB to verify proper licensing. Owner-builder status is the stated exception.

Fees

Penalty (no permit)

The owner-builder declaration notes up to a $500 civil penalty for violations of Business and Professions Code section 7031.5 in connection with permit applications, but that is not a standard permit fee.

Work That Does NOT Require a Permit

• One-story detached accessory buildings used as tool or storage sheds, playhouses, and similar uses, on a parcel with an existing single-family dwelling or other permitted primary use, where floor area does not exceed 120 square feet.
• Fences not over 6 feet high.
• Oil derricks, with zoning clearance before installation; C.U.P.A. permits may still be required.
• Retaining walls not over 4 feet high measured from bottom of footing to top of wall, unless supporting surcharge or impounding Class I, II, or IIIA liquids.
• Water tanks supported directly on grade if capacity does not exceed 5,000 gallons and the height-to-diameter or width ratio does not exceed 2:1.
• Sidewalks and driveways not more than 30 inches above adjacent grade, not over a basement or story below, and not part of an accessible route.
• Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work.
• Prefabricated swimming pools accessory to Group R-3 occupancies that are less than 24 inches deep, do not exceed 5,000 gallons, and are installed entirely above ground.
• Shade cloth structures for nursery or agricultural purposes, excluding service systems; permanent structures must meet zoning requirements.
• Swings and other playground equipment accessory to detached one- and two-family dwellings.
• Window awnings supported by an exterior wall that do not project more than 54 inches and do not require additional support for Group R and U occupancies.
• Nonfixed and moveable fixtures, cases, racks, counters, and partitions not over 5 feet 9 inches high.
• Membrane structures, including tents and awnings, erected for less than 180 days in any 12-month period; contact the local fire district for more information.

Important: The city warns that exempt work may still require other permits or technical review. Electrical, plumbing, and mechanical work tied to otherwise exempt structures can still require trade permits. Exemptions do not authorize work that violates California codes or local ordinances. New or modified driveways may require Public Works encroachment approval.

Inspections

How to Schedule

• (530) 235-3270 (phone)

Inspection hours

Monday through Thursday, 8:00 AM to 4:30 PM

Typical inspection sequence: No city-published standard inspection sequence was found on the reviewed sources. Applicants should expect inspections to be scheduled as directed by the Building Department for the relevant phases of work.

Additional Resources

• Building code: Publicly posted city materials are inconsistent. The city ordinance index includes an older ordinance description adopting the 2013 California Building Standards Code, while a current city smoke and carbon monoxide affidavit still references the 2016 California Building Code, 2016 California Residential Code, and 2016 California Fire Code. Verify the currently adopted Title 24 cycle directly with the Building Department before relying on a specific edition.
• Verify contractor license: CSLB License Lookup
• Zoning information: View zoning info
• Owner-builder rules: View rules
• Forms and Permits Page
• Municipal Code
• Building Contact Page
• Worker's Compensation Declaration
• Who May Prepare Plans
• License lookup guide: California Contractor License Requirements
• Contract template: California Homeowner-Contractor Agreement

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