Alameda County Building Department 2026: Permits, Inspections & Services

Alameda County Building Department Contact Information

Contact information and procedures reviewed October 2026. Office schedules and online systems may change; confirm before traveling.

Which areas does the county serve?

The county building department primarily serves unincorporated communities, including Ashland, Castro Valley, Cherryland, Fairview, San Lorenzo, Sunol, Castlewood, Happy Valley, and Hillcrest Knolls, along with other unincorporated properties.

Building Permits: What Do You Need?

Alameda County reviews construction and improvement projects for compliance with applicable building and safety regulations. The required permit depends on the work, property location, existing conditions, and relevant zoning rules.

For small projects, the county provides updated 2025 California Building Code permit-exemption guidance through its permit resources page. A building-permit exemption does not automatically eliminate zoning, grading, electrical, floodplain, or other requirements.

How to Apply for an Alameda County Building Permit

The county uses an electronic permit and plan-review system. You can prepare an application, upload plans, pay required fees, and check review progress without relying on a third-party permit service.

1. Confirm the property jurisdiction. Check that your job address or assessor’s parcel number is within unincorporated Alameda County. The county permit information page identifies the areas served.
2. Prepare the project information. Have the site address or parcel number, owner and applicant details, project description, estimated construction value, and applicable drawings ready.
3. Open the online permit portal. Visit acpermit.acgov.org/Portal. Select Sign In or Create Account. Account registration options include property owners, contractors, and their authorized agents.
4. Start an application. Select Apply for Permit, then Building Permit Application. Choose the appropriate application type, including an application with design when plans are required.
5. Enter the project details. Provide the address or parcel number, work description, construction type, occupancy information where applicable, proposed and existing uses, affected trades, valuation, and floor area.
6. Upload supporting documents. Attach required plans, structural calculations, reports, and other project-specific materials. Select the appropriate attachment category for each file.
7. Review and submit. Check all entries, attach applicable workers’ compensation documentation, and submit. Keep the application reference number.
8. Track review and respond. Open My Records to follow the application. The county’s guide describes an initial RQ case number. If the system displays Action Required, open the item, supply the requested information, and continue the review process.
9. Pay fees and obtain your permit. Pay the charges assigned by the county. Do not start permit-required construction until the necessary authorization has been issued.

Documents to prepare before submission

Requirements depend on the project, but common documents include:

• Site plan showing property boundaries, structures, setbacks, and proposed improvements.
• Floor plans, elevations, construction details, and relevant structural calculations.
• Electrical, plumbing, and mechanical plans where applicable.
• California energy compliance documentation and CALGreen forms when required.
• Owner-builder declarations, agent authorizations, or contractor details when applicable.
• Planning approvals and special documentation for grading, demolition, fire protection, or other regulated work.

The county offers project-specific checklists for new homes, remodels, ADUs, townhouses, commercial tenant improvements, demolition, and solar projects under Building Checklists. Match the checklist to your project instead of submitting unrelated documents.

Building Permit Fees and Plan Review

Alameda County does not charge one flat amount for every building permit. The cost depends on the type of work, project valuation, plan-review requirements, inspections, and applicable administrative or agency charges.

To estimate charges, open the official county permit resources, then find Building Permit Fee Schedule – Schedule A, Building Valuation Tables – Schedule B, and the residential or commercial fee-estimate worksheets.

Schedule a Building Inspection in Alameda County

Once your permit has been issued and the project reaches a required inspection stage, request an inspection through the county’s permit system or its published automated inspection line.

1. Locate your issued permit number. Check your approved permit documents and inspection job card.
2. Identify the correct inspection type. Use the inspection code shown on the job card for the work ready for review.
3. Schedule online or by telephone. Sign in to the official permit portal and open the inspection functions, or call the published inspection request line at (510) 670-5434.
4. Enter the requested information. Follow the system prompts for permit number, inspection type, preferred inspection date, contact phone, and other details. Follow the live prompts for the required date format.
5. Prepare the site. Make the permitted work accessible, keep approved plans and the inspection job card available, and ensure that the work is ready for the requested inspection.
6. Check results and resolve corrections. Review any inspection notes, correct deficiencies, and request reinspection when required.

Common inspection types and codes

These codes appear in county inspection guidance. Your current job card and live scheduling system control the applicable inspection selections.

Important: Do not cover regulated work before a required inspection. Depending on the project, inspections may be needed before concrete placement, wall covering, insulation concealment, or occupancy.

Alameda County Building Codes in 2026

For the 2026 code cycle, Alameda County adopted the 2025 California Building Standards Code, together with applicable county amendments. California’s 2025 Title 24 code edition became effective January 1, 2026.

Alameda County Ordinance 2025-72, adopted December 16, 2025, updated the county’s building-related ordinances, including provisions addressing:

• 2025 California Building Code and Residential Code.
• 2025 California Electrical, Mechanical, and Plumbing Codes.
• 2025 California Energy Code and CALGreen.
• 2025 California Existing Building and Historical Building Codes.
• 2025 California Wildland-Urban Interface Code.
• Applicable Alameda County amendments and related adopted provisions.

For accurate code selection: Check the project’s permit application date, applicable transitional rules, scope of work, and county amendments. Projects submitted under an earlier code cycle may be treated differently.

Official references: California Building Standards Commission – Current Codes and Alameda County Code, Chapter 15.08.

Check Permit Status and Request Building Records

Look up permits or application status

For an active application, sign in to the county online permit system and select My Records. Open the relevant case and review its status, roadmap, attachments, requests for information, and agency comments.

To search permits associated with a property, use the Alameda County Permit Portal and enter the property address. Its public permit-status search identifies issued-permit records from 2001 onward; completeness may vary.

Request historical building permit files

The county also maintains historical permit property files. Its published request process includes these details:

• Use the building permits page to submit a property-file review request.
• Include the property address, your name, telephone number, and email address.
• Requests must reach the county before 2:00 PM Wednesday for that week’s processing; later requests move to the following week.
• Staff state that requested files are generally prepared within 5–10 business days and that applicants are contacted when files are ready.
• Plans bearing professional stamps must be reviewed in person.
• For requests involving more than four files, contact permitbid@acpwa.org or (510) 670-5440.

Open the official building permit records request page.

Before You Start Construction

Use this short checklist to avoid common delays:

• Confirm your property is within the county’s building jurisdiction.
• Check both zoning requirements and building permit requirements.
• Use the checklist for your specific project and the applicable 2026 code requirements.
• Confirm that your contractor has the appropriate California license and any required local registration or business license.
• Keep issued permits and approved plans accessible at the site.
• Schedule required inspections before work is concealed.
• Complete corrections and obtain final approval before using or occupying work where final authorization is required.

Official Alameda County Resources

• ACPWA Permits: Start with building permits, public works permits, inspections, and permit-related services.
• Electronic Permit Portal: Apply, upload documents, pay fees, and manage applications.
• Permit Forms and Resources: Current forms, checklists, fee schedules, exemption guidance, and inspection resources.
• Building Records: Property permit searches and historical file requests.
• California Building Codes: Official state code editions and updates.
• Alameda County Building Ordinance: Locally adopted code provisions and amendments.

Frequently Asked Questions

Independent information notice: USBuilding.org is an independent informational website and is not affiliated with or operated by Alameda County government. Official agencies determine permit requirements, fees, approval decisions, inspections, and applicable regulations. Information reviewed October 8, 2026.