Hidden Hills Building Permits Guide for Homeowners

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

Hidden Hills handles building permits through an online Permit Center operated for the city by its contract building and safety provider, and the city says permits are issued only after plans are complete and corrected as required. This guide walks Hidden Hills homeowners through when a permit is needed, how to apply, how to request inspections, and what permit history means when you sell.

Hidden Hills permits at a glance

Department	Building and Safety/Planning, provided under contract by Transtech
City Hall	6165 Spring Valley Road, Hidden Hills, CA 91302
Phone	(818) 888-9281
Counter and phone hours	9 a.m. to 11 a.m., Monday to Friday
How to apply	Online Permit Center: create an account, fill out the application, upload PDF plans, pay by credit card
Inspection hours	Anytime after 11 a.m.
Inspection requests	Between 9 a.m. and 5 p.m., made at least 24 hours in advance
Code updates	Building and fire codes updated every three years with local amendments

When you need a building permit in Hidden Hills

The city says its Building Department is responsible for safety standards for the design, construction, materials, use and occupancy of all buildings and structures within Hidden Hills.

It provides plan check, permit issuance and inspection services for new construction, additions and remodels, so that every structure meets or exceeds the minimum life-safety standards of the codes the city has adopted.

In practice, that means homeowners should expect to need a permit for new homes, additions, guest houses and accessory units, structural changes, and work on electrical, plumbing or mechanical systems, and should ask the city before assuming that a smaller project is exempt.

The city also coordinates plan review with other departments and interested agencies. Because nearly all of Hidden Hills is a guard-gated community with its own homeowners association, a project may also need approval from the association’s architectural committee.

The city’s accessory dwelling unit page notes that a completed application includes that committee’s approval. Ask early which approvals apply, since a city permit alone may not be enough to begin building.

Step by step: how a Hidden Hills permit works

1. Read the submittal guidelines

The city publishes PDF submittal guidelines explaining how to label and format your plan files before you upload them. Reading them first avoids rejected uploads and delays. Because the system is electronic, you do not need to print and deliver paper sets, and the city notes that this eliminates most of the cost associated with paper plans.

2. Create an account at the Permit Center

Go to the Hidden Hills Permit Center, create an account, verify your email address, and log back in. The city says the system lets you submit a permit application online, upload plans for review, pay most fees with a credit card, and request inspections for permitted projects. It sends automated emails and status labels to keep you informed.

3. Apply and upload plans

Fill out the online permit application and upload your PDF plan documents. For larger projects, expect to provide drawings prepared by a licensed design professional, along with any engineering or energy documents that apply.

4. Pay fees

Plan check and permit fees can be paid by credit card through the Permit Center. The city notes that convenience fees apply to card payments.

5. Plan review, corrections and issuance

Staff check the plans, and other city departments or agencies may review them as well. The city says permits are issued only after plans are complete and corrected as required, so respond promptly to review comments. If you need to talk through a comment, call during the counter hours of 9 a.m. to 11 a.m. on weekdays.

6. Inspections through final

Inspections are performed during construction through final inspection, as described in the next section.

Hidden Hills inspections

The city lists inspection hours as anytime after 11 a.m. Requests may be made between 9 a.m. and 5 p.m. and must be made 24 hours in advance, which you can do through the Permit Center.

Plan ahead so that the work to be inspected is complete and accessible, the approved plans and permit are on site, and someone is available to give the inspector access.

The city’s counter and phone hours of 9 a.m. to 11 a.m. are the best time to call with scheduling questions.

Codes and local amendments

The Building Department prepares updated Building and Fire Codes for adoption by the City Council every three years, as California requires, and local amendments are included with each update. Because codes change on a regular cycle, a plan approved under one code edition may need updates if you let a permit lapse and reapply later. Ask the city which edition applies to your project when you submit.

Accessory dwelling units

Hidden Hills has a preapproved ADU program.

Per the city’s ADU page, preapproved plans cover detached, single-unit, one-story ADUs of 250 to 800 square feet and up to 16 feet in height, for new construction rather than conversions, and the city describes a 30-day approval timeline starting when a completed application is submitted.

Homeowners must still obtain a building permit from Building and Safety. See our Hidden Hills zoning and ADU guide for details on zones and lot rules.

Permits and selling a Hidden Hills house

Permit history matters at sale time. Buyers, lenders and appraisers ask whether additions, guest houses, barns, pools and remodels were permitted, and California sellers generally disclose known unpermitted work. Our statewide guide to selling as-is with unpermitted work explains the disclosure rules, and the seller closing costs guide covers what else to budget for.

If your Hidden Hills property has open permits, expired permits or work done without approval, you generally have three paths: finish and close the permit before listing, disclose and discount on the open market, or sell as-is to a cash buyer. A practical checklist:

• Log in to the Permit Center, or ask the city, for the permit record on your address and note anything open.
• List structures and improvements added without a permit, such as guest quarters, converted garages, arenas or barns, and pool equipment.
• Gather final inspection records, contractor invoices and any association approvals.
• Ask what it would take to legalize each item, including plans, fees, association review and inspections.
• Compare that cost and timeline with a no-repairs cash sale.

How to sell a house in Hidden Hills

1. Review which work on the property was permitted and which was not.
2. Collect permits, final inspection records, association approvals 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 Hidden Hills, including selling as-is, selling fast and selling an inherited house.

Frequently asked questions

How do I apply for a building permit in Hidden Hills?

Create an account at the city’s online Permit Center, verify your email, fill out the application, upload PDF plans and pay fees by credit card.

When can I reach the Hidden Hills building counter?

The city lists counter and phone hours of 9 a.m. to 11 a.m., Monday to Friday, at (818) 888-9281.

How far ahead must I request a Hidden Hills inspection?

The city says requests may be made between 9 a.m. and 5 p.m. and must be made 24 hours in advance, with inspections performed anytime after 11 a.m.

Do I need homeowners association approval too?

The city’s ADU page says a completed application includes architectural committee approval, so confirm with the association which approvals apply to your project.

How often do Hidden Hills building codes change?

The city says updated building and fire codes, with local amendments, are prepared for Council adoption every three years.

Can I sell my Hidden Hills 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 Hidden Hills
• We Buy Houses in Los Angeles County
• Los Angeles County Property Tax Guide
• Hidden Hills Code Enforcement Guide
• Hidden Hills Zoning and ADU Guide
• All California Guides

Sources

• City of Hidden Hills: Building and Safety/Planning
• City of Hidden Hills: Permit Center
• City of Hidden Hills: Accessory Dwelling Units

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