Hacienda Heights Homeowner Guide: Permits, ADUs and Selling

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County permits, ADUs and selling in Hacienda Heights

Plain-English guide to LA County permits, ADUs and selling a Hacienda Heights house for cash.

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

Hacienda Heights is an unincorporated community in the Puente Hills, covering about 11.9 square miles according to LA County Regional Planning. It sits in the county’s East San Gabriel Valley Planning Area, which covers 24 unincorporated communities, and it has its own Hacienda Heights Community Plan.

The Planning Commission approved that plan on September 22, 2010, and the Board of Supervisors adopted it on May 24, 2011. For a seller, that means county rules, not a city’s, govern permits, ADUs and enforcement.

The Hacienda Heights Community Plan

The plan describes a hillside-edge community at elevations from 350 to 1,150 feet, bordered by the City of Industry, Whittier, La Habra Heights and nearby unincorporated areas. It sets land-use designations such as Residential 18, 30 and 50 and matches them to zones like R-1 single-family, R-2 two-family, R-3 limited multiple residence and RPD.

The plan also lists commercial zones. Your parcel’s zoning decides what you can add or rebuild, so check it with Regional Planning rather than assuming.

Who handles what in Hacienda Heights

Topic	Who handles it
Building permits and inspections	LA County Public Works, Building and Safety
Zoning, ADUs and land use	LA County Regional Planning
Zoning violations	Regional Planning Zoning Enforcement
Property tax	LA County Assessor and Treasurer-Tax Collector

Hacienda Heights has no city government of its own, so the county rules above apply. See our East Los Angeles homeowner guide for the same county process in another unincorporated community.

When a permit is required

LA County Public Works handles permits and inspections through its EPIC-LA system, and it asks for 24 hours’ notice on inspection requests. Per the county, a permit expires if work has not started within 12 months of issuance, or if work lapses for more than 180 days. An expired permit is a common problem when a prior owner started a project and stopped. Ask the county for the permit history before you sell.

Code enforcement

Regional Planning’s Zoning Enforcement handles zoning violations. Its phone numbers are (213) 974-6453 and (213) 974-6483, the email is ZoningEnforcement@planning.lacounty.gov, and the county says the source of a complaint is kept confidential. The 211 LA County Helpline also takes reports. Building-code issues go through Public Works. If you have an open notice, mention it to any buyer.

ADUs in unincorporated areas

For single-family lots, the county’s ADU summary allows one attached ADU, one detached ADU and one junior ADU. A junior ADU is limited to 500 square feet. A state-exempt detached ADU can be up to 800 square feet, with 4-foot setbacks and a height of 16 to 20 feet.

The county says it decides within 60 days. It also runs an amnesty program under AB 2533 for existing unpermitted ADUs and offers free pre-approved plans. Rules depend on the parcel, so confirm with Regional Planning.

Not found in official sources

The county’s Hacienda Heights page did not mention a community standards district, a hillside rule, a fire hazard zone or oak tree rules, so this guide makes no claim on them. LA County Fire publishes fire hazard severity zone maps, and a parcel near the hills should be checked there.

Permits, violations and selling a Hacienda Heights house

Older Hacienda Heights houses often have enclosed patios, converted garages or additions. Sellers must disclose known unpermitted work. Our guide to selling as-is with unpermitted work covers your options. A cash buyer buys as-is and accounts for any permit gap in the price.

Before you list or accept an offer

Pull the permit history for the address from the agency that governs it, and note any open or expired permits.
Walk the property and list every addition, conversion, outbuilding or system you changed since you bought.
Look for any open notice or order, and keep copies of correspondence.
Order or review a preliminary title report to see liens and recorded items.
Get a written offer and compare it with the net from a repair-and-list sale after repairs, agent commissions and holding costs.

Property tax and your sale

Sellers in Hacienda Heights pay property tax through LA County. A sale can trigger a reassessment for the buyer, and unpaid or delinquent tax shows up in escrow and is paid from the sale proceeds. Our Los Angeles County property tax guide explains the basics, and our closing cost guide covers what sellers usually pay at closing.

How to sell a house in Hacienda Heights

Ask for a cash offer. Send the address through the form above or call (424) 435-2326. We prepare a written offer, usually within 24 to 48 hours.
Share what you know. Tell us about open permits, unfinished work, tenants, liens or a probate. Tell us about enclosed patios, garage conversions, expired permits or any county notice.
Compare your options. Weigh the offer against a repair-and-list sale, which brings repair costs, showings and agent commissions. There is no obligation to accept.
Open escrow. If you accept, we open escrow with a title company, and the title report shows liens and recorded items. See our seller closing cost guide.
Close on your date. We buy as-is, with no repairs or showings. You pick the closing date within the limits of title and escrow.

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Frequently asked questions

Is Hacienda Heights a city?

No. LA County Regional Planning describes it as an unincorporated community, so county agencies handle permits and zoning.

Which plan governs Hacienda Heights?

The Hacienda Heights Community Plan, adopted by the Board of Supervisors on May 24, 2011, within the East San Gabriel Valley Area Plan.

Who issues permits in Hacienda Heights?

LA County Public Works, Building and Safety.

How many ADUs can a single-family lot have?

The county’s ADU summary allows one attached ADU, one detached ADU and one junior ADU on a single-family lot, subject to site rules.

Can I sell with an expired permit?

Yes, with disclosure. Per the county, a permit expires if work has not started within 12 months or lapses for over 180 days.

How fast can you close?

We prepare a written offer within 24 to 48 hours and close on a date you choose.

More guides

Sources

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