Westside · Los Angeles
ADU permits in Holmby Hills
Holmby Hills is among the most exclusive residential neighborhoods in the United States, with about 2,500 people on estate-scale lots between Beverly Hills, Bel-Air, and Westwood. The 1908 Holmby Park, the Playboy Mansion (sold 2016 but historically located here), and dozens of multi-acre estates anchor a community where median home values top $12M. Accessory Dwelling Unit (ADU) builds here are almost always guesthouses or staff quarters rather than rental investments.
Holmby Hills by the numbers
Rounded figures from the 2020 US Census, LA County Assessor parcel data, and LADBS PermitLA filings. Estimates only — your specific lot can vary widely.
Population
2,500
2020 Census
Single-family homes
~600
LA County Assessor
Median lot size
25,000 sqft
Approximate
ADU permits filed 2024
~8
Estimated from LADBS PermitLA filings. Among the most exclusive LA City neighborhoods — very few ADU permits filed annually.
Permit overlays active in Holmby Hills
These are LA City zoning / regulatory overlays that hit a meaningful share of Holmby Hills parcels. Each one affects what you can build, how long it takes, or how much it costs. Run your specific address through the feasibility check on the homepage to see which apply to your lot.
Holmby Hills HPOZ-adjacent character
~40% of parcelsMuch of Holmby Hills is on the National Register or has informal preservation interest. Major exterior changes face design-context review.
Beverly Park-style estate lots
~70% of parcelsLot sizes commonly exceed 20,000 sqft. ADU footprint constraints almost never bind here.
Watch-outs specific to Holmby Hills lots
Patterns we see across Holmby Hills permits and corrections. None of these are dealbreakers — they're just the things people get wrong most often when they don't know the neighborhood.
- 01
Estate-scale ADUs are typically guesthouses, not rentals
Multi-acre Holmby Hills estates can fit 1,200 sqft ADUs comfortably — but they're almost always built as guesthouses or staff quarters, not rental income units. Rental demand for $15K/month detached ADUs is thin.
- 02
Architectural review can be heavy
Holmby Hills has informal but real architectural-character expectations. Modern or contrasting-style ADUs face long pushback cycles even outside formal HPOZ designation.
Need a person, not a wizard?
Routes that fit Holmby Hills
Based on what we know about Holmby Hills, these are the lead types that usually make sense here. Pick whichever fits your situation. All free, no obligation.
Complex permit context
Request a Holmby Hills permit referral
Coastal, hillside, historic, fire-zone, or multi-overlay parcels in Holmby Hills usually mean a permit expediter pays for itself in saved months. We work with vetted Los Angeles permit expediters and expeditors (both spellings) who've handled Holmby Hills projects.
Complex permit context
Request a Holmby Hills permit referral
Coastal, hillside, historic, fire-zone, or multi-overlay parcels in Holmby Hills usually mean a permit expediter pays for itself in saved months. We work with vetted Los Angeles permit expediters and expeditors (both spellings) who've handled Holmby Hills projects.
Talk to our financing broker
Want someone to walk you through your options?
Our in-house broker has 30+ years in LA mortgage and ADU financing. He'll lay out HELOC, construction-to-perm, and ADU-specific products like Renofi against your situation — free, no obligation.
Talk to our financing broker
Want someone to walk you through your options?
Our in-house broker has 30+ years in LA mortgage and ADU financing. He'll lay out HELOC, construction-to-perm, and ADU-specific products like Renofi against your situation — free, no obligation.
What you can build in Holmby Hills
Holmby Hills is inside the City of Los Angeles, so LADBS permits apply. Typical zoning in Holmby Hills: R1-1, RE15. For these single-family zones, current LA City rules allow:
- Detached ADU. Up to 1,200 sqft, 16 ft tall (or 18 ft with second-story setbacks). 4 ft side/rear setbacks. One per lot.
- Attached ADU. Up to 50% of the primary house's living area, max 1,200 sqft. Must share a wall with the existing house.
- JADU (Junior ADU). Up to 500 sqft, inside the existing house footprint. Must have its own entrance. One per lot, in addition to a regular ADU.
- Two units per single-family lot. One full ADU + one JADU on the same SFR lot — allowed under LA's current rules. The combination is the highest density unlock without going SB 9.
- Parking exemption near transit. No replacement parking required if your lot is within ½ mile of a major transit corridor. Most lots within walking distance of Ventura Blvd, Sherman Way, or the Metro Orange Line qualify.
Recent CA + LA laws that affect Holmby Hills ADUs
California has steadily loosened ADU rules since 2017. LA implements these through local ordinance. Here's what currently applies in Holmby Hills:
AB 68
20201,200 sqft ADUs by right
Allowed detached ADUs up to 1,200 sqft on any single-family lot, removed owner-occupancy requirements through 2025, and capped permit processing time at 60 days. This is the foundation of the current LA ADU rules.
AB 671
2020Permit fee waivers for moderate-income ADUs
If you rent your ADU below market for the first 5 years, LA waives most permit and impact fees. Practical use is limited but it's the path that exists.
AB 332
2023School impact fees waived under 750 sqft
LAUSD's school impact fee — historically $2–4/sqft — is waived entirely for ADUs under 750 sqft. The YOU-ADU plan (455 sqft) qualifies, as do most JADUs.
SB 9
2022Lot splits + duplex conversions on R1
Separate from ADUs, but worth knowing: you can split certain R1 lots into two and build a duplex on each half. It's narrower than the headlines suggested and most LA homeowners still pursue the ADU path, not the SB 9 path, but check if you have a large flat lot.
AB 1033
2024Sell your ADU as a condo (LA opt-in pending)
Lets cities allow ADUs to be sold separately as condos. LA hasn't opted in yet (as of early 2026). Watch for it — would let homeowners build an ADU and sell it as a standalone unit.
LA Ordinance 187,712
2024Streamlined permits for pre-approved plans
LADBS now offers same-day permit issuance for ADUs built from a pre-approved standard plan (YOU-ADU or any LADBS-licensed designer plan). This is the fastest legal path from contract to building permit.
What's changing in LA permit policy
Recent LADBS bulletins, City Council motions, and ordinances that affect what you can build (and how easily) in Holmby Hills. Updated quarterly — sourced from public LA city records.
Streamlined permits for pre-approved standard plans
activeOrdinance No. 187,712 · Mar 2024
LADBS now offers same-day permit issuance for ADUs built from a pre-approved standard plan — the City's free YOU-ADU plan or any LADBS-licensed designer plan (ADU1–ADU96). This is the fastest legal path from contract to building permit in LA. Custom-designed ADUs still go through standard plan check.
Read the official text ↗AB 1033 opt-in study — should LA allow ADU condo sales?
pendingCouncil File 23-0843 · Nov 2024
LA City Council motion directing Planning + LADBS to study opting into AB 1033, which would let homeowners sell their ADU as a separate condo unit. Currently pending committee review. If LA opts in, ADUs become tradable real estate — major change for the homeowner economics conversation.
Read the official text ↗Updated ADU Construction Memorandum
activeLADBS Information Bulletin P/BC 2024-160 · Apr 2024
Consolidates LADBS's ADU permit requirements into a single bulletin reflecting recent state law changes (AB 332 school fee waiver, AB 976 permanent owner-occupancy waiver). Worth bookmarking — this is the LADBS staff reference for ADU plan check.
Read the official text ↗School impact fee waiver for ADUs under 750 sqft
activeCalifornia AB 332 · Oct 2023
Permanently waives LAUSD's school impact fee (~$5/sqft) for any ADU 750 sqft or smaller. Saves $3,750 on a 750-sqft ADU; $0 vs. ~$5,000 on an 800-sqft ADU. The threshold is the single biggest fee-savings lever in LA ADU economics.
Owner-occupancy waiver made permanent
activeCalifornia AB 976 · Oct 2023
Permanently removed the owner-occupancy requirement that previously limited ADU rental flexibility. You can build an ADU on your property and rent it out without living on-site yourself. The original AB 68 (2020) waiver was set to sunset in 2025; AB 976 made it permanent.
Cities may opt-in to allow ADU condo sales (LA: not yet opted in)
passedCalifornia AB 1033 · Oct 2023
Allows California cities to opt into a program letting ADUs be sold as condos separately from the primary house. LA hasn't opted in yet (Council File 23-0843 is the pending study). When/if LA opts in, ADUs become standalone sellable units — major change for the build-as-investment conversation.
Streamlined permit timelines + unpermitted ADU amnesty path
activeCalifornia AB 2533 · Sep 2024
Caps local permit processing time at 60 days for non-discretionary ADU permits and creates a path for existing unpermitted ADUs to be legalized without retroactive penalties (if they meet current building code). LADBS implementation of the amnesty portion is rolling out through 2025.
Public schools serving Holmby Hills
School zone assignments vary by exact address. For your specific lot, use LAUSD's Resident Schools Lookup ↗. The default assignments below cover most of the neighborhood.
District
Los Angeles Unified (LAUSD)
Elementary
Warner Avenue Elementary
Notable alternatives in the area
- Harvard-Westlake (private)
What makes Holmby Hills Holmby Hills
The places that anchor the neighborhood's identity — useful context if you're marketing a future ADU to renters or thinking about long-term resale value.
Park
Holmby Park
1908 LA City park at the heart of Holmby Hills. Lawn bowling, walking paths.
Cultural landmark
Carolwood Drive estate row
Historic estate row including the former Playboy Mansion (Charing Cross Road) + the Aaron Spelling estate.
Pre-approved plans that fit Holmby Hills lots
Picking a pre-approved standard plan is the fastest legal path to a permit. These are the options most homeowners in Holmby Hills consider:
Browse all 40 pre-approved plan firms →Frequently asked questions about Holmby Hills ADUs
›Can I build an ADU in Holmby Hills?
Yes — Holmby Hills is inside the City of Los Angeles, so the same LADBS rules apply as the rest of LA. Most single-family lots in Holmby Hills (zoned R1-1, RE15) can host one ADU plus one JADU under current law. Run your specific address through the feasibility check on the homepage to confirm your zone and overlays.
›How much does it cost to build an ADU in Holmby Hills?
Typical all-in cost for a permitted detached ADU in Holmby Hills runs $150,000–$400,000+ depending on size, finish level, and whether you're on a flat lot or hillside. The free 455 sqft YOU-ADU plan keeps total cost low; HCD-prefab units (Connect Homes, Cover) are turnkey at $190K–$350K. Use the cost calculator linked above for a per-lot estimate.
›How long does the ADU permit process take in Holmby Hills?
LADBS aims for 60-day plan check on ADU permits — and same-day issuance if you use a pre-approved standard plan (YOU-ADU or a licensed designer plan). In practice, custom plans average 4–7 months from submittal to building permit. Flat-lot Holmby Hills permits are usually on the faster end of that range.
›Do I need a contractor with a specific license for an ADU in Holmby Hills?
Yes — California requires a B (General Building) license for any structure with two or more trades, which describes essentially every ADU. You can owner-build, but most homeowners hire a licensed contractor.
›Does Holmby Hills have an HPOZ (historic overlay) I need to worry about?
Parts of Holmby Hills fall under an HPOZ. HPOZ ADUs need approval from the Office of Historic Resources in addition to LADBS, which adds 2–4 months and design-review constraints.
›What about the new CA ADU laws — do they apply in Holmby Hills?
Yes. CA's recent ADU bills (AB 68 from 2020, AB 332 from 2023, AB 1033 from 2024, plus several others) all apply statewide and override stricter local ordinances. LA implemented them via Ordinance 187,712 in 2024, which streamlined permit issuance for pre-approved standard plans. Holmby Hills sees the full benefit since LADBS is the permitting agency.
›Can I rent out the ADU on Airbnb in Holmby Hills?
Short-term rentals (under 30 days) are restricted in LA City — you can only Airbnb your primary residence, not an ADU you don't live in, and there's a 120-night cap per year. Holmby Hills is no exception. Long-term rentals (30+ day leases) are unrestricted and are the more common ADU monetization path.
›Do I need an architect or can I use a draftsperson?
For a pre-approved standard plan (YOU-ADU or a LADBS-licensed designer plan), neither — the plan is already drawn and stamped. For a custom ADU, a licensed architect or civil engineer must stamp the structural drawings. Draftsperson alone is not enough for the structural set.
Nearby areas to Holmby Hills
Other Los Angeles-area pages worth a look. Each one runs different Accessory Dwelling Unit (ADU) rules depending on jurisdiction — we show you what changes when you cross a city or county line.
LA City
Bel-Air →
Premium hillside Westside estate community. Multi-acre lots support generous ADU footprints, but VHFHSZ + Bel-Air Association deed-restriction overlays + canyon-road construction logistics drive real cost.
LA City
Westwood →
UCLA-adjacent premium Westside neighborhood. Single-family ADU pockets in Westwood Hills + south-Holmby command premium rental economics from the UCLA + Westside hospital + tech employment base.
Independent city
Beverly Hills →
Premium home values support strong Accessory Dwelling Unit (ADU) economics, but Beverly Hills' design review, conservation overlays, and detailed local ordinance make this one of the more procedurally complex Westside cities.
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