ADU Constructionin Huntington Park, CA
An ADU in Huntington Park needs a minor development permit under Article 26, decided ministerially: the City must say within 15 business days whether the application is complete and decide within 60 days of a complete one. The code lists both 800 and 850 or 1,000 square foot limits, so ask Planning, and state law controls.
Huntington Park is a dense, old, mostly rented city: about three square miles, a population that peaked at 61,348 in 2000, and a housing stock where 48.1 percent of units are single-family and 32.7 percent sit in buildings of five or more units. The City rewrote its ADU rules in Article 26 of the Zoning Code, effective January 23, 2026, so a lot of older advice no longer matches.
This page walks through that article, the two size limits it states, garage conversions, apartment lots, the liquefaction map under most of the city and what a sale inspection finds. Regional costs and the full timeline sit on our ADU construction page, and the Huntington Park overview lists every trade we manage here.
What Huntington Park's Article 26 and Planning say about ADUs
Where adu construction permits come from in Huntington Park: City of Huntington Park Community Development Department, Building & Safety Division.
- Article 26 of the Zoning Code (Ordinance 2025-13, adopted December 23, 2025, effective January 23, 2026) requires a minor development permit before any ADU or JADU, as a ministerial action with no hearing. The City must tell the applicant within 15 business days whether the application is complete and approve, or deny with a full set of comments, within 60 days of a complete application.
- ADUs are allowed as of right in the R-L, R-M and R-H zones (the zoning table also shows ADUs in mixed-use and commercial zones that allow housing), and a JADU only on a lot with a single-family home. Local standards that conflict with State law (Government Code sections 66310 to 66342) are void and State law governs anything the article does not cover.
- On a lot with a single-family home, Huntington Park allows one new detached ADU, one ADU converted from existing space, one attached ADU and one JADU of up to 500 square feet. On a multifamily lot it allows up to two detached ADUs with a proposed multifamily building or up to eight detached ADUs with an existing one (not more than the existing unit count) plus conversion ADUs up to 25 percent of the existing units, with a minimum of one.
- ADU size: at least 150 square feet and at most 850 square feet for a studio or one bedroom, or 1,000 square feet for two or more bedrooms. An attached ADU is capped at 50 percent of the primary home's floor area but an 850 or 1,000 square foot unit is still allowed, and a conversion may add 150 square feet for ingress and egress. The article's unit-count section separately says a new detached ADU may be a maximum of 800 square feet, so the two limits should be confirmed with Planning.
- ADU height is 16 feet for a detached unit, 18 feet when the lot is within half a mile of a major transit stop or high-quality transit corridor (including 2 feet to match the primary roof pitch) or on a multifamily multi-story lot, and 25 feet or the zone's height limit, whichever is lower, for an attached unit.
- ADUs need setbacks of no more than 4 feet from the side and rear lot lines, none when converted from existing living area or an accessory structure or rebuilt in the same place and to the same dimensions as an existing structure, and the zone's front setback unless it would block an 800 square foot unit (9-3.2650, standard 5).
- Parking is one off-street space per ADU or per bedroom, whichever is less, and may be uncovered, in a setback or tandem. None is required within half a mile walking distance of public transit, in a historically significant district, when the ADU is within the primary residence or an accessory structure, when on-street parking permits are required but not offered to the occupant, within one block of a car-share vehicle, or when applied for with a new home. No parking is required for a JADU.
- ADUs under 750 square feet and JADUs under 500 square feet pay no impact fees, and ADUs of 750 square feet or more pay impact fees in proportion to the ADU's size relative to the primary dwelling (ADU square feet divided by primary square feet, times the fee). A detached ADU built with a new single-family home needs its own utility connection and the normal connection fee and capacity charge, while conversions do not.
Sources for these rules
How does an ADU permit work in Huntington Park under Article 26?
Article 26 of the Zoning Code was adopted December 23, 2025 and took effect January 23, 2026. It requires a minor development permit before any ADU or junior ADU, decided ministerially, meaning by objective standards with no hearing. Under the article's text on eCode360, the City must say within 15 business days whether the application is complete, then approve it, or deny it with a full set of comments, within 60 days of a complete application.
We found no ADU page, handout, fee sheet or pre-approved plan set on the City's Planning page or its Building pages. The process above therefore comes from the code alone, and the fee for the minor development permit is unconfirmed. Planning's counter takes walk-ins from 7:00 a.m. to noon Monday through Thursday and appointments from 2:00 p.m. to 5:30 p.m., at (323) 584-6210.
Construction drawings then go to Building & Safety through its electronic portal. MDG Builders, CSLB #1040337, prepares the plans and files both applications; licensed subcontractors pour the slab, frame, plumb and wire the unit under our supervision.
How big can an ADU be in Huntington Park: 800, 850 or 1,000 square feet?
The code gives two answers, so we state both. The unit-count section says a new detached ADU may be up to 800 square feet, while the size section allows 850 square feet for a studio or one bedroom and 1,000 for two or more bedrooms, with a 150 square foot minimum. An attached ADU is capped at half the main home's floor area, though an 850 or 1,000 square foot unit is still allowed.
Ask Planning in writing which figure applies to your lot before drawings start. State law sets the floor either way: under Government Code sections 66310 to 66342, a city may not cap a unit below 850 square feet, or 1,000 with more than one bedroom, and the article itself says conflicting local standards are void.
Height is 16 feet for a detached unit, 18 feet within half a mile of major transit or on a multistory multifamily lot, and 25 feet or the zone's limit for an attached unit. Side and rear setbacks are no more than 4 feet, none for a conversion, and the zone's front setback applies unless it would block an 800 square foot unit.
Can I convert my Huntington Park garage into an ADU?
Yes. On a lot with a single-family home, the code lists one new detached ADU, one ADU converted from existing space, one attached ADU and one junior ADU of up to 500 square feet as separate categories. A conversion may add up to 150 square feet for entry and exit, and it keeps whatever setbacks the old walls had.
Two garage details come straight from the article. A converted garage loses its driveway approach, and the curb and gutter are replaced, under standard 8 of Section 9-3.2650. And the main home needs no replacement parking when the garage is converted. Removing a driveway approach is flatwork, so our concrete page covers the apron and curb side of the job.
For the technical side of a conversion, the best-sourced checklist we have is for Los Angeles, not Huntington Park. Read our garage conversion steps as a pattern and confirm every item with the Division.
Build an ADU on an older Huntington Park lot: what the housing stock changes
Many lots here are apartment sites, not backyards. For a lot with an existing multifamily building, Article 26 allows up to eight detached ADUs, never more than the existing unit count, plus conversion ADUs in non-livable space up to 25 percent of the existing units, with a minimum of one. A proposed multifamily building can add two detached ADUs.
The single-family lots are old too. The Sunrise Tract was subdivided in 1901, the Pacific Electric line arrived along Randolph Street in 1902, and population jumped from 4,513 in 1920 to 24,591 in 1930, so 27.5 percent of today's homes date from 1939 or earlier. Expect older garages, tight alleys and lot lines that do not square, and note that a new detached ADU must match the main home's style, colors and materials.
With 75.8 percent of homes renter-occupied, the owner is often a landlord. An ADU may be rented, for terms of 30 days or longer, but not sold separately from the main home.
Do soils, utilities and fees change an ADU foundation in Huntington Park?
Possibly. The 2023 Safety Element says most of the city is subject to liquefaction, with the area north of Gage Avenue, west of Pacific Boulevard and east of Wilmington Avenue not at risk. We also sampled the County's liquefaction hazard layer at 80 evenly spaced points inside the city, and 66 of them, 82.5 percent, fall in a mapped zone. Ask whether a soils report is required for a new slab or footing, because it sets the foundation type and cost.
No fault is known to cross the city and no fire-zone or hillside rule applies, so site work is mostly about soil, utilities and lot lines. ADUs under 750 square feet and junior ADUs under 500 pay no impact fees, and larger ADUs pay in proportion to their size against the main home. A conversion needs no new utility connection, and fire sprinklers are required only if the main home needs them.
The one building fee we can print is the $100.00 permit issuance fee on the January 2026 schedule. The minor development permit fee was not confirmed.
Can I rent, sell or list a Huntington Park ADU, and what does a sale inspection check?
Rent yes, sell no. Article 26 lets an ADU be rented for terms of 30 days or longer, so nightly listings are outside it, and an ADU cannot be sold separately from the main home. A junior ADU needs the owner to live on the property only if it shares a bathroom with the house.
At a sale, the pre-sale report under Municipal Code chapter 8-17 checks permit records and the interior of accessory structures, so an old unpermitted garage unit is exactly what it finds. Major violations must be fixed within 60 days. Permitting a unit properly now keeps that record clean later, and our ADU versus JADU guide explains which unit type suits a rental plan.
How much does an ADU cost in Huntington Park, and how long does the build take?
No Huntington Park cost study turned up, so we use regional sources. A UC Berkeley survey of 2018 and 2019 projects put the Los Angeles County median at $100,000, with garage units at $90,000 and detached units at $180,000, and Remodeling magazine's 2025 Cost vs. Value report lists a Los Angeles ADU at $178,536. Our working ranges are $100,000 to $200,000 for a garage conversion and $200,000 to $400,000 for a detached unit of 400 to 800 square feet.
The permit clocks are the statute's 15 business days and 60 days. Our planning estimates add 4 to 10 weeks of design, then 3 to 5 months of construction for a garage unit or 5 to 9 months for a detached one, plus 1 to 3 weeks for final inspection. The ADU cost guide shows every source.
ADU photos from Huntington Park and nearby communities
ADU framing, garage conversions and finished cottages tied to Huntington Park and nearby places such as South Gate, Lynwood and Maywood. Tap a photo to enlarge it.
What adu construction costs around Huntington Park
Regional figures for a garage conversion and a new detached unit are on our ADU construction page, and no Huntington Park fee sheet or cost study turned up, so read every dollar amount as a regional anchor. Neighbors write their own rules: see South Gate, Lynwood and Los Angeles. If you are weighing a unit against more rooms, our room addition or ADU guide and the Huntington Park room addition page compare the two, and a unit this age often comes with bathroom remodeling in Huntington Park in the main house.
| What it covers | Typical range |
|---|---|
| Garage conversion to a studio or one bedroom | $100,000 to $200,000 |
| New detached ADU, 400 to 800 sq ft | $200,000 to $400,000 |
| UC Berkeley survey, Los Angeles County median, 2018 and 2019 projects | $100,000 overall. $90,000 garage. $180,000 detached. |
| Terner Center and Berkeley CCI, 2020 | $148,000 Los Angeles estimate. $167,000 statewide average. |
| Remodeling Cost vs. Value 2025, Los Angeles | $178,536 job cost |
| Electrical and plumbing, Angi Los Angeles, January 2026 | Electrical $2,600 to $7,800. plumbing $3,900 to $10,400. |
| City permit and plan check fees | Not priced here |
Other work we manage in Huntington Park
Huntington Park ADU questions, answered
How do I build an ADU in Huntington Park?
File a minor development permit with Planning under Article 26, then submit construction drawings to Building & Safety through its electronic portal. The City must say within 15 business days whether the application is complete and decide within 60 days of a complete one. Soils, energy forms and structural sheets come first, so budget design time before filing.
How long does it take to get an ADU permit in Huntington Park?
The code sets a 60 day decision clock from a complete application, after a 15 business day completeness check. Building plan check for the construction drawings is separate, and the City publishes no time for it, so we quote none. Design before filing usually takes 4 to 10 weeks in our planning estimate.
How big can an ADU be in Huntington Park?
Between 150 and 850 square feet for a studio or one bedroom, or up to 1,000 for two or more bedrooms, per the size section of Article 26, though another section says 800 for a new detached unit. Ask Planning in writing. State law sets the floor, and an attached ADU is capped at half the main home's floor area.
Do I need to provide parking for an ADU in Huntington Park?
Usually not. Parking is one space per ADU or per bedroom, whichever is less, but none is required within half a mile of public transit, in a historically significant district, for a unit inside the main home or an accessory structure, or within a block of a car-share vehicle. No replacement parking is needed for a converted garage.
Can I convert my garage to an ADU in Huntington Park?
Yes. Article 26 allows an ADU converted from existing space, with up to 150 added square feet for entry and exit and no replacement parking for the main home. The driveway approach must be removed and the curb and gutter replaced. Confirm the slab, wall and panel details with Building & Safety before pricing.
Can I sell my ADU separately from my main house in Huntington Park?
No. Article 26 allows an ADU to be rented, for terms of 30 days or longer, but not sold separately from the main home. State law carves out narrow exceptions, such as a qualified buyer through a nonprofit or a city condominium ordinance, so ask Planning whether either applies.
How much does it cost to build an ADU in Huntington Park?
Regionally, about $100,000 to $200,000 for a garage conversion and $200,000 to $400,000 for a new detached unit of 400 to 800 square feet, drawn from studies dated 2018 to 2026. No Huntington Park cost study turned up. Your written proposal, built on your lot, soils and utilities, is the real price.
Are there impact fees for an ADU in Huntington Park?
Not under 750 square feet. Article 26 exempts ADUs under 750 and junior ADUs under 500 from impact fees, while larger ADUs pay in proportion to their size against the main home. A detached ADU built with a new home pays normal utility connection fees, and conversions do not. We found no City ADU fee sheet, so ask for current amounts.
Can I build more than one ADU on my Huntington Park lot?
Often, yes. A single-family lot can have one new detached ADU, one converted ADU, one attached ADU and one junior ADU. A lot with an existing multifamily building can add up to eight detached ADUs, never more than the existing unit count, plus conversions up to 25 percent of the units. Planning confirms what fits your lot.
Does a Huntington Park ADU need a soils report or fire sprinklers?
Sprinklers only if the main home needs them, and none for a junior ADU. A soils report is a different question: most of the city sits in a mapped liquefaction zone, so ask Planning and Building whether your foundation needs one before you pay for drawings.
Tell us about your Huntington Park ADU
Tell us the lot type, whether you are converting a garage or building new, how many units are on the lot now and which size limit Planning gave you, and we will start from Article 26.