Antioch Building Permits Guide for Homeowners

Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team.

Antioch runs its permits through an Online Permitting System, and the city began enforcing the California 2025 Building Codes on January 1, 2026. This guide explains how permits work for Antioch homeowners: which office handles them, how to apply, what the city says about inspections and fees, and how permit history affects a sale. Fees, forms and hours change, so confirm details with the Building Services Division before you start work.

Antioch permits at a glance

Office	Building Services Division, Community Development Department, City of Antioch
Phone	Building Services (925) 779-7065; City main line (925) 779-7000
City hours	Monday through Friday, 8 a.m. to 5 p.m.
How to apply	City of Antioch Online Permitting System
Permit types in the portal	Building permits, encroachment permits, planning entitlements and use permits
Code edition	California 2025 Building Codes, enforced since January 1, 2026
Fees	Set by the City of Antioch Master Fee Resolution (Antioch Municipal Code section 8-1.03)
Inspections	Requested and managed through the online system

What the Building Services Division does

The city describes the division as the office that administers state and local building construction regulations. In practice that means it reviews plans, issues permits, and inspects work on structures, electrical, plumbing and mechanical systems.

The Antioch Municipal Code, in Title 8, adopts the building codes locally and says the fee for each permit is set by the city’s Master Fee Resolution, with the value of the work determined by the Building Official.

Because the fee schedule is a separate resolution, the amount you pay depends on the project and on whichever schedule is current when you apply.

Projects that usually need a permit

Typical homeowner jobs that fall under building permit rules include room additions, structural changes, new electrical or plumbing runs, water heater and HVAC replacements, re-roofing in many cases, window changes that alter openings, and conversion of a garage or porch to living space.

Accessory dwelling units go through the same division, with separate planning rules covered in our Antioch zoning and ADU guide.

Cosmetic work such as painting or replacing flooring generally does not call for a permit, but the city is the final word on any specific project, so call before you assume a job is exempt.

Step by step: an Antioch permit

1. Confirm the requirements

Call Building Services at (925) 779-7065 or use the city’s website to describe the project. Ask whether planning review, engineering review or a fire district review is also needed.

2. Create an account and apply online

The Online Permitting System lets you apply for permits, upload documents, request and manage inspections, and pay invoices. If the project is in the public right-of-way, such as a driveway apron or utility connection, ask about an encroachment permit as well.

3. Plan review and fees

Larger projects go through plan check before the permit is issued. Fees are based on the Master Fee Resolution, and for some projects other agencies, such as the school district or sanitation district, also collect fees before the permit is issued.

4. Build and inspect

Schedule each inspection through the portal as work progresses. Do not cover framing, wiring or plumbing before it has been inspected.

5. Final inspection

A finaled permit is the clearest evidence that the work was inspected. Keep the final sign-off with your closing papers.

Permits and selling an Antioch house

Buyers and lenders ask about permit history, and California sellers generally disclose known unpermitted work. Our statewide guide to selling as-is with unpermitted work explains what disclosure involves, and the seller closing costs guide shows what else to budget. If tenants live in the home, read the tenant-occupied home sale guide.

When an Antioch home has an open permit, an expired permit, or work done without one, you generally have three options: finish and finalize the permit before listing, disclose the work and negotiate on the open market, or sell as-is to a cash buyer who takes the house in its current condition. Use this checklist:

• Ask Building Services for the permit record on your address.
• List every addition, garage conversion, enclosed patio or outbuilding, and note which have permits.
• Gather final inspection records and contractor invoices.
• Ask what plans, fees and inspections it would take to permit each unpermitted item.
• Compare that cost and time with a no-repairs cash sale. New construction can also be reassessed for property tax, which our Prop 13 guide explains.

Questions to ask Building Services before you start

• Does my project need planning, engineering or fire district review in addition to a building permit?
• What fees apply under the current Master Fee Resolution, and which outside agencies also charge fees?
• How long is plan check running right now for this project type?
• What inspections will be required, and in what order?
• Can an older unpermitted structure on my lot be legalized, and what would that take?

Common permit mistakes homeowners make

The most common problems are starting work before the permit is issued, skipping a required inspection, letting a permit go stale without a final, and assuming a contractor pulled a permit when none exists. Each one can surface years later when a buyer’s agent or lender asks for records.

A never-finalized permit is easier to resolve while you still own the home and can answer questions from the city. If you do not plan to stay, decide early whether finishing the permit or selling the house as it stands makes more sense.

If you hired a contractor, ask for a copy of the permit and the final inspection record. Check that the permit lists your address and the work actually performed, since a permit for a water heater does not cover a bedroom addition.

How to sell a house in Antioch

1. Ask the city for the permit record on your address.
2. Collect permits, final inspection records and any city notices.
3. Request a no-obligation cash offer for the house as it stands.
4. Choose your closing date.
5. Close with no repairs, permit cleanup or showings required.

Our local pages cover related situations in Antioch, including selling as-is, selling fast, selling an inherited house and avoiding foreclosure. See also our Antioch page and the Contra Costa County hub.

Frequently asked questions

How do I apply for a building permit in Antioch?

Use the city’s Online Permitting System, which handles building permits, encroachment permits, planning entitlements and use permits. For questions, call Building Services at (925) 779-7065.

Which building code does Antioch enforce?

The city says it enforces the California 2025 Building Codes effective January 1, 2026.

How are Antioch permit fees set?

The Antioch Municipal Code says each permit fee is set in the City of Antioch Master Fee Resolution, with the value of the work determined by the Building Official.

Can I schedule inspections online in Antioch?

Yes. The Online Permitting System lets applicants request and manage inspections and pay invoices.

Can I legalize an unpermitted structure in Antioch?

For ADUs, the city invites owners to call Building Services at (925) 779-7065 to discuss retroactively receiving a permit. Other structures vary, so ask the division.

Do I need an encroachment permit for work in the street?

The portal lists encroachment permits as a separate permit type, so work in the public right-of-way is handled apart from a building permit.

Can I sell my Antioch house with unpermitted work?

Yes. You can disclose it and sell as-is, including to a cash buyer. Our statewide guide explains the disclosure rules.

More guides

• We Buy Houses in Antioch
• We Buy Houses in Contra Costa County
• Contra Costa County Property Tax Guide
• Antioch Code Enforcement Guide
• Antioch Zoning and ADU Guide
• All California Guides

Sources

• City of Antioch: Building Division
• City of Antioch: Online Permitting System
• Antioch Municipal Code section 8-1.03: Issuance of Building Permits
• City of Antioch: Accessory Dwelling Units handout

This guide is general information from public sources, not legal advice. Confirm current rules, fees and hours with the city.