County Building Permits

Alameda County, CA - 2026 Building Permit Guide

How to apply for a building permit in unincorporated Alameda County, California. Permit authority, application steps, fees, and inspection requirements.

California Updated March 2026

Permit Authority

This department handles building permits and inspections for unincorporated Alameda County, including communities such as Ashland, Castro Valley, Cherryland, Fairview, San Lorenzo, Sunol, and other county service areas; it is not a separate city building department.

Department
Alameda County Public Works Agency, Building Inspection Department
Address
399 Elmhurst Street, Room 141, Hayward, CA 94544
Phone
(510) 670-5440
Website
https://www.acpwa.org/permits/building-inspections/index.page

Online Permit Portal

Open Alameda Public Portal / Virtual Permit Center

Platform: Alameda Public Portal / Virtual Permit Center • Account required: Yes • Submission: Online or in-person

Application Process

  1. Confirm the property is in unincorporated Alameda County and check any planning or zoning constraints first. Alameda County routes unincorporated building permit work through ACPWA and related county review agencies.
  2. Prepare the application package. County materials point applicants to the Uniform Building Permit Application and related forms, and the county code requires construction documents and a site plan with property lines, existing and proposed structures, grades, and similar site data.
  3. Submit the permit application through the Virtual Permit Center, or in person at the One-Stop Permit Center if your permit type is not fully handled online. The county says online offerings continue to expand, but some permit types still require in-person processing.
  4. Pay the required application, permit, and plan review fees. The county portal also supports online fee payment for registered users.
  5. Respond to plan review comments and resubmit if required. County ordinance allows additional or excessive review fees when repeated resubmittals are needed.
  6. After approval, obtain permit issuance and keep the permit and inspection record card available at the job site.
  7. Request required inspections as work progresses and complete final approval before occupancy or use.

Typical processing time: Alameda County does not publish one universal turnaround for all building permits on its main building page. For county-sponsored ADU guidance, the permitting phase is described as typically taking 1-6 months, with review comments often issued within 60 days for ADU applications.

Source: Alameda County Public Works Agency, Building Inspection Department

General Requirements

ACPWA states that building or development projects in unincorporated Alameda County require compliance with county ordinances and acquisition of permits. If work is not listed as exempt, the county materials indicate permit review should be assumed and staff consulted.

Required Documents

  • Uniform Building Permit Application
  • Construction documents/plans
  • Site plan
  • Applicable supporting forms such as Authorization of Agent to Act on Property, Notice to Owner Builder, CALGreen/energy documentation, debris management materials, and project-specific reports or checklists
  • Structural plans, energy forms, and in some cases soils/geotechnical information for new dwellings and larger projects
Permit validity
Under Alameda County Ordinance 2022-58, permits generally expire if the work is not completed within 1 year from issuance, unless a longer or shorter period is set for the project. The county also allows renewal requests before expiration, and a separate completion permit process for unfinished work.
Building code
The county adopted the 2022 California Building Standards Code, with Alameda County amendments, effective January 1, 2023. ACPWA also states the 2025 California building codes apply to permit applications submitted on or after January 1, 2026.
Owner-builder
Owner-builders are recognized by the county's permit forms. The county publishes a Notice To Owner Builder Form, so owner-builders should expect to sign the county's acknowledgment and follow state owner-builder rules.
Contractor requirements
The county portal registration guide requires contractors to register with a CSLB license, workers' compensation information, and an Alameda County business license before using contractor portal functions. The public portal guide also says homeowners, contractors, and agents use separate registration paths.

Fees

Minimum permit fee
$140 minimum service fee / minimum permit issuance fee in the county's publicly posted Schedule A materials
Plan check fee
County Schedule A materials publicly posted online show building plan review at 80% of the building permit fee, $140 minimum
Permit fee formula
Primarily valuation-based for building permits, with Schedule B valuation tables and additional fixed or percentage-based fees for subtrades and related charges
Trade permit fee
Additional fixed or percentage-based fees for subtrades and related charges under county schedules.
Reinspection fee
Alameda County ordinance authorizes reinspection fees when work is not ready or corrections are incomplete. Publicly posted Schedule A materials show additional inspection/reinspection fees at $140 per hour, one-hour minimum, and the ordinance separately authorizes investigation fees for work started without a permit in addition to regular permit and plan review fees.
Penalty (no permit)
Alameda County ordinance authorizes reinspection fees when work is not ready or corrections are incomplete. Publicly posted Schedule A materials show additional inspection/reinspection fees at $140 per hour, one-hour minimum, and the ordinance separately authorizes investigation fees for work started without a permit in addition to regular permit and plan review fees.
Payment note
The Alameda Public Portal supports online fee payment for registered users. ACPWA's 2024 fee handout also lists a 3% credit card transaction fee.

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

Work That Does NOT Require a Permit

  • Minor plumbing repairs such as stopping leaks, clearing stoppages, and removing/reinstalling toilets, so long as valves, piping, and fixtures are not replaced or rearranged
  • Replacement of component parts of an appliance that does not alter its approval
  • A unit refrigerating system
  • In dwelling units, replacement of dishwashers, garbage disposals, ranges, ovens, cooktops, compactors, washers, dryers, and similar equipment when installed in the same location and without significant utility alterations
  • Sunshade structures accessory to single-family dwellings, such as trellises, lath houses, arbors, and patio covers, when each structure is 120 square feet or less and not more than 10 feet average height
  • Certain small non-electrical signs, subject to the county's dimensional limits and prior planning approval
  • Resurfacing cabinets only, in-kind appliance replacement, in-kind outlet/light replacement, and finish work such as painting or replacement of existing vinyl tile in limited kitchen maintenance situations
  • New siding over existing structurally sound siding, and minor siding repair under 20 square feet aggregate
  • Repair of less than 200 square feet aggregate roof area of a previously permitted roof

Important: County brochures say exempt work must still comply with code and other county laws, and approvals from Planning, Environmental Health, Fire, or Road Encroachment may still be required even when a building permit is exempt. Separate electrical, mechanical, or plumbing permits may still be required for otherwise exempt building work.

Inspections

How to Schedule

Scheduling deadline
The automated inspection request line accepts requests 24 hours a day, 7 days a week, and the older county inspection brochure says requests must be received before 12:00 a.m.
Inspection hours
Building permit processing hours are 8:30 am-4:30 pm Monday, Tuesday, Thursday, and Friday, and 9:00 am-4:30 pm Wednesday. The automated inspection request line accepts requests 24 hours a day, 7 days a week, and the older county inspection brochure says requests must be received before 12:00 a.m. for the requested inspection day. The portal guide says users can request AM or PM inspection preferences.
Time windows
Building permit processing hours are 8:30 am-4:30 pm Monday, Tuesday, Thursday, and Friday, and 9:00 am-4:30 pm Wednesday. The automated inspection request line accepts requests 24 hours a day, 7 days a week, and the older county inspection brochure says requests must be received before 12:00 a.m. The portal guide says users can request AM or PM inspection preferences.

Typical inspection sequence: County job-card materials show a standard progression from foundation and underfloor work, to rough trade and framing inspections, then insulation and wall covering stages, then final plumbing/electrical/HVAC/building sign-offs and any required agency clearances.

Additional Resources

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Alameda County Public Works Agency, Building Inspection Department before applying.

Frequently Asked Questions

Alameda County Building Permit FAQ

Do I need a building permit in unincorporated Alameda County, CA?
ACPWA states that building or development projects in unincorporated Alameda County require compliance with county ordinances and acquisition of permits. If work is not listed as exempt, the county materials indicate permit review should be assumed and staff consulted.
How much does a building permit cost in unincorporated Alameda County, CA?
The minimum permit fee is $140 minimum service fee / minimum permit issuance fee in the county's publicly posted Schedule A materials. Fees are calculated as: Primarily valuation-based for building permits, with Schedule B valuation tables and additional fixed or percentage-based fees for subtrades and related charges. Plan check fee: County Schedule A materials publicly posted online show building plan review at 80% of the building permit fee, $140 minimum.
How do I apply for a building permit in unincorporated Alameda County, CA?
1. Confirm the property is in unincorporated Alameda County and check any planning or zoning constraints first. Alameda County routes unincorporated building permit work through ACPWA and related county review agencies. 2. Prepare the application package. County materials point applicants to the Uniform Building Permit Application and related forms, and the county code requires construction documents and a site plan with property lines, existing and proposed structures, grades, and similar site data. 3. Submit the permit application through the Virtual Permit Center, or in person at the One-Stop Permit Center if your permit type is not fully handled online. The county says online offerings continue to expand, but some permit types still require in-person processing. 4. Pay the required application, permit, and plan review fees. The county portal also supports online fee payment for registered users. 5. Respond to plan review comments and resubmit if required. County ordinance allows additional or excessive review fees when repeated resubmittals are needed. 6. After approval, obtain permit issuance and keep the permit and inspection record card available at the job site. 7. Request required inspections as work progresses and complete final approval before occupancy or use.
How long does it take to get a building permit in unincorporated Alameda County, CA?
Typical processing time is Alameda County does not publish one universal turnaround for all building permits on its main building page. For county-sponsored ADU guidance, the permitting phase is described as typically taking 1-6 months, with review comments often issued within 60 days for ADU applications..
What work is exempt from building permits in unincorporated Alameda County, CA?
The following work is generally exempt: Minor plumbing repairs such as stopping leaks, clearing stoppages, and removing/reinstalling toilets, so long as valves, piping, and fixtures are not replaced or rearranged; Replacement of component parts of an appliance that does not alter its approval; A unit refrigerating system; In dwelling units, replacement of dishwashers, garbage disposals, ranges, ovens, cooktops, compactors, washers, dryers, and similar equipment when installed in the same location and without significant utility alterations; Sunshade structures accessory to single-family dwellings, such as trellises, lath houses, arbors, and patio covers, when each structure is 120 square feet or less and not more than 10 feet average height; Certain small non-electrical signs, subject to the county's dimensional limits and prior planning approval; Resurfacing cabinets only, in-kind appliance replacement, in-kind outlet/light replacement, and finish work such as painting or replacement of existing vinyl tile in limited kitchen maintenance situations; New siding over existing structurally sound siding, and minor siding repair under 20 square feet aggregate; Repair of less than 200 square feet aggregate roof area of a previously permitted roof. Note: County brochures say exempt work must still comply with code and other county laws, and approvals from Planning, Environmental Health, Fire, or Road Encroachment may still be required even when a building permit is exempt. Separate electrical, mechanical, or plumbing permits may still be required for otherwise exempt building work.
How do I schedule a building inspection in unincorporated Alameda County, CA?
Inspections can be scheduled via: Online through the Alameda Public Portal / Virtual Permit Center at https://acpermit.acgov.org/Portal/#/, https://acpermit.acgov.org/Portal/#/, https://permit.acgov.org/CategoryResident.aspx, (510) 670-5434, permitbid@acpwa.org. The automated inspection request line accepts requests 24 hours a day, 7 days a week, and the older county inspection brochure says requests must be received before 12:00 a.m..

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authority listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.
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