Hawthorne, CA Building Permit Guide

Permit Authority

Building & Safety handles permitting, plan check, and inspections for work within the City of Hawthorne city limits; the CSS guide notes out-of-city addresses trigger a warning during application entry

Department

City of Hawthorne Building & Safety

Address

4455 W. 126th Street, Hawthorne, CA 90250

Phone

(310) 349-2990

Email

Public webpage shows an Email link but does not publish a readable email address on the page reviewed

Website

https://www.cityofhawthorne.org/departments/building-safety

Online Permit Portal

Application Process

1. Create a Hawthorne CSS account and complete registration with email, phone, address, and signature. Activation links expire in 7 days.
2. In CSS, choose the permit application type, then enter the project address. The system warns if the address is outside Hawthorne city limits.
3. Enter project details required for the selected permit type, including a clear scope description and, where applicable, square footage and valuation.
4. Add the required contacts for the application, such as owner, contractor or owner-builder, architect, or engineer.
5. Upload required plans and supporting documents. Hawthorne's CSS guide says required attachment types depend on permit type; for plan resubmittals, building plans should be combined in one PDF, MEP files uploaded separately, and supporting documents uploaded as separate PDFs.
6. Sign electronically, review the application, and submit through CSS. City staff then follow up through the portal/dashboard for next steps, corrections, fees, issuance, and inspection readiness.
7. If a property owner is using an agent to sign on the owner's behalf for an owner-builder permit, submit the City's Authorization of Agent form before permit issuance.

Typical processing time: No general citywide turnaround posted on the sources reviewed. Inspection requests are tentatively scheduled about 1-2 business days after request depending on the day submitted and closed-Friday schedule.

Source: City of Hawthorne Building & Safety

General Requirements

Hawthorne enforces permits for construction, alteration, enlargement, repair, movement, demolition, conversion, occupancy-related work, and related building, electrical, mechanical, and plumbing work under its adopted 2022 California codes. Work started before permit issuance is subject to additional investigation and penalty fees. Demolition also requires a building permit, and city bulletins note additional fire department and Cal/OSHA permits may apply depending on scope.

Required Documents

• Varies by permit type, but Hawthorne CSS requires project address, scope description, valuation/square footage where applicable, required contacts, and required attachments. City guidance for plan-related submittals references complete building plans, separate MEP files, structural calculations, energy reports, geotechnical/hydrology reports if applicable, and response letters for corrections. Demolition bulletins also require demolition drawings, schedule, and safety program/site safety information.

Permit validity

Permit applications are deemed abandoned after 180 days unless pursued in good faith or issued; written extensions may be granted in increments up to 90 days each, with no extension beyond 2 years from original submittal. After issuance, permits become invalid if work does not commence within 12 months, or if 12 months pass after the last inspection or other proof of continuing work; written extensions of up to 180 days each may be granted for justifiable cause.

Building code

Hawthorne adopted the 2022 California Building Code, plus related 2022 California Building Standards Codes in Title 15, including local amendments. The code states the most recently adopted California State code and the Hawthorne Municipal Code control.

Owner-builder

Hawthorne publishes an Authorization of Agent to Act on Property Owner's Behalf form for owner-builder permits. If someone else signs for the owner, the form must be completed before permit issuance. The form says the owner remains personally responsible for the Notice to Property Owner, and the owner must provide ID, notarization, or other acceptable verification of signature.

Contractor requirements

Hawthorne's ADU FAQ states construction must, at minimum, be performed by a contractor licensed by the State of California unless handled under an owner-builder path.

Fees

Minimum permit fee

Not stated on the public sources reviewed

Plan check fee

Required where applicable; amount not publicly stated on the sources reviewed

Permit fee formula

The Building & Safety Requirements page says permit and plan check fees are based on the cost of performing the work. Hawthorne code also says work begun before permit issuance is subject to an added investigation fee set by the Building Official and the current City Fee Schedule.

Penalty (no permit)

Hawthorne code authorizes investigation fees for unpermitted work, up to the amount of the permit fee, based on the current City Fee Schedule.

Payment note

Permit and plan request payments can be made by credit card through CSS. Hawthorne's online payment page states credit-card processing fees are $2.50 for transactions up to $66.66 and 3.75% for transactions of $66.67 and above.

Fees change. Verify current amounts at the official fee schedule.

Work That Does NOT Require a Permit

• Work exempt from permit generally follows 2022 California Building Code Section 105.2 as adopted by Hawthorne
• Hawthorne specifically amends the fence exemption so fences not over 6 feet high are exempt from permit
• Because Hawthorne only publicly identifies the local amendment in the city code section reviewed, confirm any other claimed CBC 105.2 exemptions with Building & Safety before relying on them

Important: Exemption from permit does not waive compliance with zoning, fire, accessibility, utility, or other code requirements. Separate electrical, plumbing, mechanical, grading, demolition, fire department, or public works approvals may still be required depending on scope.

Inspections

How to Schedule

• Inspections are requested through CSS at (online)
• (310) 349-2990 (phone)

Scheduling deadline

The inspection page says inspection times vary; call before 9:00 a.m. Permits issued before July 2022 must be scheduled by phone with Building & Safety at (310) 349-2990.

Inspection hours

The inspection page says inspection times vary; call before 9:00 a.m. on the inspection date for the exact time slot. Business-location inspections are described on another city page as occurring between 9:00 a.m. and 5:00 p.m. Building counter hours are Monday-Thursday 7:30 a.m.-5:30 p.m. and alternating Fridays 7:30 a.m.-4:30 p.m., with plan-check counter hours generally 8:00 a.m.-11:00 a.m. except Wednesdays.

Time windows

The inspection page says inspection times vary; call before 9:00 a.m. on the inspection date for the exact time slot. Business-location inspections are described on another city page as occurring between 9:00 a.m. and 5:00 p.m. Building counter hours are Monday-Thursday 7:30 a.m.-5:30 p.m. and alternating Fridays 7:30 a.m.-4:30 p.m., with plan-check counter hours generally 8:00 a.m.-11:00 a.m. except Wednesdays.

Typical inspection sequence: After permit issuance and active status in CSS, the applicant requests required inspections as work progresses. In the CSS workflow, inspections move from Requested to Scheduled to Closed. The exact sequence depends on permit type and scope.

Additional Resources

• Building code: Hawthorne adopted the 2022 California Building Code, plus related 2022 California Building Standards Codes in Title 15, including local amendments. The code states the most recently adopted California State code and the Hawthorne Municipal Code control.
• Zoning information: View zoning info
• https://www.cityofhawthorne.org/departments/building-forms
• https://ecode360.com/HA4935
• https://www.cityofhawthorne.org/departments/planning/pre-approved-adu-plans
• https://www.cityofhawthorne.org/residents/online-payments
• License lookup guide: California Contractor License Requirements
• Contract template: California Homeowner-Contractor Agreement

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