Thousand Oaks Building Permits Guide for Homeowners

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

Thousand Oaks handles building permits through its Building Division, accepts applications through an online Application Assistant, and sets firm deadlines in Chapter 4 of its municipal code for when applications and permits expire. This guide explains the process, the exemptions, the expiration and refund rules, and what permit history means if you plan to sell.

Thousand Oaks permits at a glance

Department	Building Division, Community Development
Address	2100 Thousand Oaks Blvd, Thousand Oaks, CA 91362
Phone and email	(805) 449-2320, building@toaks.gov; counter line (805) 449-2500 option 3
Counter hours	Mon 7:30-3, Tue 7:30-5, Wed 9:30-5, Thu 7:30-5, alternating Fridays 8-5 (call first)
Applications	Online through the city’s Application Assistant
Planning	(805) 449-2323, planning@toaks.gov
Public Works	(805) 449-2400
Fire (Ventura County Fire)	(805) 389-9738
Contractor license questions	Contractors State License Board, (800) 321-2752

What the Building Division does

The Building Division reviews plans, issues permits and inspects work to protect public safety, and it keeps the record that a future buyer or lender may ask to see.

The city lists the permit types it handles, including ADUs and JADUs, water heaters and fixtures, gas, water and sewer line repair, electrical service up to 200 amps, minor electrical, furnace and HVAC replacement (with a site plan for air conditioners), small solar PV systems and EV charging.

Applications are filed through the city’s online Application Assistant. Counter hours vary by day and alternate on Fridays, so call (805) 449-2500 before you visit.

When a permit is required, and when it is not

Section 8-4.09 of the municipal code says a permit is required for construction, alteration, repair, demolition and similar work, and it lists exemptions.

Among them are accessory buildings of 120 square feet or less and 12 feet high that meet conditions, fences up to 6 feet, masonry walls up to 3 feet, retaining walls up to 4 feet, roof repairs covering 100 square feet or less, and detached decks no more than 29 inches above grade.

The code is clear that an exemption from a building permit does not authorize a zoning violation, so a shed that needs no building permit can still break setback rules. If you are unsure, call the Building Division before you start.

The application process

1. Decide who will pull the permit

A licensed contractor can apply on your behalf, and owners of owner-occupied single-family homes can apply as owner-builders. Check a contractor’s license with the Contractors State License Board at (800) 321-2752.

2. Prepare the application

Section 8-4.010 lists what an application must include, such as a description of the work, plans and calculations as required. Projects that touch fire hazard areas or add structures typically need coordination with Planning and Ventura County Fire.

3. Submit and respond to plan review

Applications are submitted through the Application Assistant. Staff review the plans and issue comments that you must address.

4. Pay fees and receive the permit

Once plans are approved and fees paid, the permit is issued and work can begin.

5. Schedule inspections and finish the permit

Inspections are scheduled by phone through the city’s inspection line at (805) 449-2600, and the permit is closed only after the final inspection passes.

Deadlines that catch owners off guard

• An application expires 180 days after it is filed if the permit is not issued, with a 90-day extension available (Section 8-4.11).
• A permit expires if work does not begin within 365 days, or if 365 days pass after the last successful inspection (Section 8-4.12).
• A permit to legalize unpermitted or unlawful work expires in 90 days, and you can request one extension of up to 90 days in writing before it expires.
• Extensions of a regular permit can be requested within the valid period or within 30 days after expiration, for up to 180 days, with a fee.
• The city can deny a new permit while noticed code violations exist on the property, except where the permit is needed to fix the violation or address an immediate threat (Section 8-4.14).

Refunds and extra fees

Section 8-4.15 allows refunds in some cases. Up to 90 percent of a plan review fee can be refunded if the request is made before review starts, and up to 80 percent of the permit fee if no work has begun.

Amounts of $35 or less are not refundable, and refund claims must be made within 180 days. Section 8-4.16 allows a reinspection fee when an inspection must be repeated, and demolition permits are covered in Section 8-4.13.

Permits and selling your Thousand Oaks house

Buyers, lenders and appraisers ask whether additions, garage conversions and remodels were permitted, and sellers must disclose known unpermitted work. Our statewide guide covers disclosure. The 90-day legalization permit window is worth knowing about, since a rushed legalization can expire before the work is done. For ADU rules see our Thousand Oaks zoning and ADU guide, and for what happens with violations see the code enforcement guide.

A checklist before you decide how to sell:

• List past projects and note which had permits and final inspections.
• Check for any expired permits or open applications.
• Ask the Building Division what it would take to close or legalize each item.
• Compare the cost and timing with a no-repairs cash sale.

How to sell a house in Thousand Oaks

1. Review which work was permitted and which was not.
2. Collect permits, final inspections and 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 or permit cleanup required.

Related local pages: sell as-is in Thousand Oaks, sell fast, cash home buyers and the cash offer process.

Frequently asked questions

How do I apply for a permit in Thousand Oaks?

Applications are filed through the city’s online Application Assistant, and the Building Division can be reached at (805) 449-2320.

How long is an application valid?

An application expires after 180 days, with a 90-day extension available.

When does an issued permit expire?

If work does not begin within 365 days, or 365 days after the last successful inspection.

Can I get a refund if I cancel?

The code allows up to 90 percent of plan review fees before review starts and up to 80 percent of permit fees if work has not begun, within 180 days.

Can unpermitted work be legalized?

Yes, through a permit that expires in 90 days and can be extended once for up to 90 days.

Can I sell a Thousand Oaks house with open permits?

Yes. You can disclose it and sell as-is, including to a cash buyer.

More guides

• We Buy Houses in Thousand Oaks
• We Buy Houses in Ventura County
• Ventura County Property Tax Guide
• Thousand Oaks Zoning and ADU Guide
• Thousand Oaks Code Enforcement Guide
• All California Guides

Sources

• City of Thousand Oaks: Building Division
• Thousand Oaks Municipal Code, Chapter 4 Building Code

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