ADU Permit Guide: What Your City Actually Requires (Los Angeles vs. Beverly Hills vs. West Hollywood Compared)

By California Construction & Remodeling Experts | February 2026

Three Cities, Three Sets of Rules, One Very Confused Homeowner

If you own property in the greater Los Angeles area and you're thinking about building an Accessory Dwelling Unit, you've probably already Googled "ADU rules California" and found pages of state-level information. State law says you can build up to 1,200 square feet. State law says the city must approve your permit within 60 days. State law says no owner occupancy requirement. Great.

Then you call your city's planning department and discover that Beverly Hills has a local detached ADU cap of 650 square feet. That West Hollywood requires your ADU to match the exterior appearance of your primary dwelling. That the City of Los Angeles has a pre-approved Standard Plan Program that can cut your permitting timeline to three weeks, while Beverly Hills has its own separate Preapproved ADU Program with different plans and a different submission process.

The problem is not a lack of information. The problem is that every source mixes state law and local ordinance together without telling you which is which. A homeowner in Beverly Hills reads that ADUs can be 1,200 square feet and designs accordingly, only to learn at plan check that their city's local code caps detached ADUs at 650 square feet unless they go through a discretionary Minor

Accommodation Permit process.

This article fixes that problem. We break down the actual, city-specific requirements for the three municipalities where we do the most work: the City of Los Angeles, Beverly Hills, and West Hollywood. Side by side. No state-law-vs-local-ordinance confusion. Just what your city actually requires so you can plan, budget, and build with confidence.

📌 Key Takeaways: What You'll Learn in This Article

• City-by-city comparison table showing maximum ADU size, height limits, setbacks, parking, and permit timelines for LA, Beverly Hills, and West Hollywood.

• Which cities have pre-approved ADU plans and how much time and money they save ($10,000–$15,000 in architectural fees, 2–4 months of holding costs).

• The Beverly Hills catch: local detached ADU cap of 650 sq ft vs. the state's 1,200 sq ft, and what it takes to exceed it.

• West Hollywood's design matching rule and the 6-foot building separation requirement most homeowners don't know about.

• 2025/2026 state law updates that override local rules: AB 976 (permanent no owner-occupancy), AB 2533 (legalize pre-2020 unpermitted units), SB 543 (interior livable space clarification), and AB 1332 (60-day mandate).

• Real construction costs by ADU type: garage conversion ($80,000–$130,000), detached new build ($150,000–$400,000+), and what Title 24's 2025 update adds to the bottom line.

The Master Comparison: LA vs. Beverly Hills vs. West Hollywood

This is the table nobody else publishes. Every ADU guide gives you state law. We give you what happens when you actually walk into your city's building department.

Requirement	City of Los Angeles	Beverly Hills	West Hollywood
Max Detached ADU Size	1,200 sq ft	650 sq ft (local cap); state floor of 800 sq ft applies via ministerial path	1,200 sq ft (2+ BR); 850 sq ft (studio/1 BR)
Max Attached ADU Size	1,200 sq ft or 50% of primary dwelling	1,200 sq ft or 50% of primary dwelling, whichever is less	1,200 sq ft or 50% of primary dwelling, whichever is less
Max Height (Detached)	16 ft base; 18 ft near transit; 20 ft if near transit + matching roof pitch	14 ft (ground floor); 2nd floor on lots 24,000+ sq ft only	18 ft detached; 20 ft if matching roof pitch of primary
Max Height (Attached)	Up to 25 ft or primary dwelling height	Same as primary dwelling height limit	Up to 25 ft or zone height limit, whichever is less
Side/Rear Setbacks	4 ft minimum	4 ft minimum	4 ft minimum
Building Separation	Per code	Per code	6 ft minimum from other structures
Parking Required	Usually none (transit, converted garage, and other broad exemptions)	1 space unless transit exemption applies	None required
Design Review	No discretionary review for compliant ADUs	No discretionary review for compliant ADUs; Minor Accommodation Permit for non-conforming	No discretionary review; must match primary dwelling exterior
Pre-Approved Plans	Yes (LADBS Standard Plan Program, 20+ designs)	Yes (Designer-Owned Preapproved ADU Program, ~70% complete plans)	Yes (Pre-Approved ADU Program)
Permit Timeline	21–30 days (pre-approved); 60 days (custom)	60 days statutory; faster with pre-approved plans	60 days statutory
ADUs per Single-Family Lot	1 detached + 1 JADU (+ potentially 1 attached)	1 ADU + 1 JADU; Incentive ADU possible on lots 13,000+ sq ft	1 detached or converted ADU + 1 JADU
Impact Fees	Exempt under 750 sq ft	Exempt under 750 sq ft	Exempt under 750 sq ft
Short-Term Rental Allowed	Only if ADU is host's primary residence and registered	No (minimum 31-day rental)	No (minimum 31-day rental)

⚠️ Pro-Tip: State law says a city cannot prevent you from building an ADU of at least 800 square feet with 4-foot setbacks and 16 feet of height, regardless of what the local code says. This means Beverly Hills's 650-square-foot cap on detached ADUs is overridden by state law for the basic ministerial path. In practice, you can build an 800-square-foot detached ADU by right on most Beverly Hills residential lots. But going above 800 square feet up to the state maximum of 1,200 requires navigating the local code, which may involve a discretionary permit. Know which number applies to your specific situation before you start design.

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City of Los Angeles: The Fastest Path in the Region

The City of Los Angeles has the most streamlined ADU permitting process of the three cities, largely because of its scale. LADBS (the Los Angeles Department of Building and Safety) processes more ADU permits than nearly any building department in the country, and the infrastructure reflects that volume.

Pre-Approved Standard Plan Program

This is the single biggest time and money saver available to LA homeowners. LADBS maintains a library of over 20 pre-approved ADU designs ranging from studios to two-bedroom units. These plans have already been reviewed for building code, residential code, and green code compliance. When you use a pre-approved plan, the city only needs to review your site-specific conditions (foundation, setbacks, utility connections), not the structure itself.

The result: permits issued in as little as 21 to 30 days in late 2025 and early 2026, compared to 4 to 6 months for a fully custom design. The savings: approximately $10,000 to $15,000 in architectural fees you don't have to spend, plus 2 to 4 months of holding costs you avoid.

Height Bonuses Near Transit

LA's height rules for ADUs are the most generous of the three cities. A detached ADU on a standard single-family lot gets a 16-foot baseline. If your property is within half a mile of a major transit stop or high-quality transit corridor, you get 18 feet. If you're near transit and your ADU's roof pitch matches the primary dwelling, you can reach 20 feet, which makes a viable two-story design possible.

Given LA's expanding Metro system, a significant number of properties now qualify for the 18-foot or 20-foot bonus. Check ZIMAS (zimas.lacity.org) to see if your parcel is in a qualifying area.

Parking: Essentially Eliminated

Parking requirements for ADUs in LA have been functionally removed for most properties. You're exempt if your property is within half a mile of transit, in a historic district, if the ADU is part of a conversion, if there's a car-share vehicle within one block, or if on-street parking permits aren't offered to the ADU occupant. If you convert a garage, no replacement parking is required. In practice, the vast majority of LA properties qualify for at least one of these exemptions.

What to Watch For

Hillside and Very High Fire Hazard Severity Zones (VHFHSZ). Properties in these areas face additional requirements including fire-resistant materials, potentially fire sprinklers, and possibly additional setbacks. Budget an extra 20% for hardened materials in VHFHSZ areas.

Utility upgrades. LADWP sometimes requires electrical panel or water line upgrades for ADU projects. Budget an additional $5,000 to $15,000 for potential utility work, especially on older properties.

Form-Based Zoning transition. DTLA and Boyle Heights have already switched to form-based zoning, which changes how FAR (Floor Area Ratio) is calculated for multi-unit properties. If your property is in a transitioning area, confirm which zoning framework applies before you start design.

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Beverly Hills: The Local Code Matters More Than Anywhere Else

Beverly Hills is where the gap between "what state law allows" and "what the city actually permits" is widest. If you read a generic ADU guide and assume you can build a 1,200-square-foot detached ADU at 16 feet tall, you'll be in for a surprise at plan check.

The 650-Square-Foot Detached ADU Cap

Beverly Hills's local ADU ordinance (Article 50 of the Beverly Hills Municipal Code) caps detached ADUs at 650 square feet. This is significantly below the state's 1,200-square-foot maximum.

Here's where it gets nuanced. State law provides a protected minimum: no city can prevent an 800-square-foot ADU with 4-foot setbacks and 16-foot height from being built ministerially. So on most Beverly Hills single-family lots, you can actually build an 800-square-foot detached ADU by right, overriding the local 650-square-foot cap. But if you want to go above 800 square feet toward the 1,200 state maximum, you'll need to navigate the city's discretionary process, which may require a Minor Accommodation Permit and possibly an R-1 Permit reviewed by the Planning Commission.

The bottom line: plan for 800 square feet as your by-right target in Beverly Hills. If you need more space, budget additional time and fees for the discretionary process.

The 14-Foot Height Limit

Beverly Hills limits detached ground-floor ADUs to 14 feet, which is 2 feet shorter than the state's 16-foot baseline. Two-story ADUs are only permitted on estates of 24,000 square feet or more, and only then if the ADU complies with the primary dwelling's height limit. For the vast majority of Beverly Hills properties, a single-story ADU is the realistic option.

The Planning Commission can approve an ADU exceeding 14 feet if it determines the structure won't substantially impact adjacent properties, but this is a discretionary process with no guaranteed outcome.

The Incentive ADU Program

Beverly Hills offers something the other two cities don't: an Incentive ADU that allows an additional ADU beyond state law allowances on single-family lots of 13,000 square feet or more. The catch is that one ADU on the property must be deed-restricted for rental use with a minimum one-year lease term. For homeowners with larger estates who want to maximize rental income, this is worth exploring.

Preapproved ADU Program

Beverly Hills has its own preapproved plan program, separate from LADBS. The city offers architectural, structural, mechanical, electrical, and plumbing designs that are approximately 70% complete and have already passed the city's Building and Safety review. You contract directly with the designer, add your site-specific details, and apply for a building permit. The process is straightforward: complete a Building Permit Application referencing the Preapproved Plan Number, email it to the Permit Center at cdpermits@beverlyhills.org, and within 2 to 3 business days the city processes your application and sends an email invitation to pay the submittal fee and upload materials.

What to Watch For

Window placement near property lines. Beverly Hills requires that new or relocated windows within 10 feet of a side or rear property line be either at least 6 feet above finished grade or use obscured glass. This affects ADU designs that want natural light near lot edges.

Drainage requirements. No concentrated drainage to the alley (sheet flow only) and no concentrated drainage to adjacent private property. Drainage must be directed to the street via curb drains per city standard. This sometimes requires site grading work that adds to project cost.

Solar PV under separate permit. Beverly Hills requires that solar equipment be installed under a separate review and permit prior to final inspection of the ADU. Plan for this in your timeline.

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West Hollywood: Design Matching and the 6-Foot Rule

West Hollywood sits between LA and Beverly Hills in terms of permitting complexity. The state-level reforms apply here, but West Hollywood layers on two notable local requirements that trip up homeowners who aren't prepared for them.

The Design Matching Requirement

West Hollywood requires that new ADUs generally conform to the external appearance of the primary dwelling unit. This means matching color, material, roof pitch, roofline, door and window style, and other general visual characteristics. The goal is neighborhood compatibility, and the standard is objective (not subjective design review), but it does limit your options.

If your primary home has a Spanish Revival exterior and you want a modern flat-roof ADU, you'll face pushback. Plan your ADU design around your existing home's aesthetic from the start, and you'll avoid corrections during plan check.

The 6-Foot Building Separation Requirement

This is the rule that catches people. New ADUs in West Hollywood must maintain a minimum of 6 feet of separation from other structures on the lot. On smaller properties, this 6-foot buffer combined with 4-foot setbacks from property lines can meaningfully reduce the buildable footprint. Run your site plan early to confirm that the geometry works before you invest in architectural drawings.

Size Limits: Bedroom Count Matters

West Hollywood ties detached ADU size to bedroom count. A studio or one-bedroom ADU caps at 850 square feet. A two-bedroom or larger ADU can go up to 1,200 square feet. This means your unit plan directly affects your maximum square footage. If you're designing a one-bedroom unit, you're capped at 850 regardless of lot size.

Multifamily ADU Allowances

West Hollywood has a significant amount of multifamily housing stock, and the ADU rules for multifamily lots are more generous than many homeowners realize. A multifamily property can have multiple converted ADUs (up to 25% of existing dwelling units) and up to two detached ADUs with a proposed multifamily building, or up to eight detached ADUs with an existing multifamily building (not exceeding the number of existing primary units). For investors with multifamily holdings in WeHo, this is a substantial opportunity.

Rooftop Decks: Prohibited

West Hollywood specifically prohibits rooftop decks on ADUs. If your design concept includes a rooftop entertaining space, it will not be approved, even through the discretionary development permit process. Remove it from your plans before submission.

Parking: No Requirement

West Hollywood does not require off-street parking for ADUs. If you're converting a garage, no replacement parking is required. This is the simplest parking situation of the three cities.

What to Watch For

ADU Permit vs. Building Permit. In West Hollywood, some ADUs only need a building permit (if they meet all the general requirements in Section 19.36.310.E), while others also need a separate ADU Permit reviewed by the Community Development Director. The ADU Permit is still ministerial (no hearing, no discretionary review), but it's an additional step with additional processing time. Check which path your project falls into before you estimate your timeline.

Unpermitted structures on the lot. West Hollywood will not deny your ADU application due to a nonconforming zoning condition, building code violation, or unpermitted structure on the lot, as long as it doesn't present a threat to public health and safety and isn't affected by the ADU construction. This is helpful if your property has older non-conforming conditions.

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The 2025/2026 State Law Updates That Changed Everything

California's legislature has been relentless in expanding ADU rights. Here are the key state-level changes that took effect in 2025 and beyond, overriding local restrictions in all three cities.

AB 976: Permanent Owner-Occupancy Ban. Before this law, the state only prohibited owner-occupancy requirements for ADUs permitted between 2020 and 2025. Cities could theoretically reimpose the requirement after 2025. AB 976 permanently prohibits any city from requiring owner-occupancy for ADUs, period. You can rent your ADU to a tenant and live elsewhere.

AB 2533: Legalize Pre-2020 Unpermitted ADUs. This law restricts cities from denying a permit to legalize an existing but unpermitted ADU built before January 1, 2020, unless the unit is deemed substandard under California Health and Safety Code Section 17920.3 (serious safety hazards). Before submitting a permit application, you can hire a private contractor to inspect the unit and provide a cost estimate. Additionally, cities cannot charge impact fees or connection fees for unpermitted ADUs being legalized that don't require new utility connections.

AB 1332: 60-Day Approval Mandate + Pre-Approved Plans. The city must approve or deny a complete ADU application within 60 days. If no action is taken within 60 days, the application is deemed approved by operation of law. AB 1332 also requires all California cities to develop a pre-approved ADU plan program.

SB 543: Interior Livable Space Clarification. This law clarifies that square footage limits refer to interior livable space, not gross building footprint. This is relevant when calculating whether your ADU meets local size caps.

SB 1211: Expanded Parking Protection. Previously, cities couldn't require replacement parking when you demolished a garage for an ADU. SB 1211 extends this to uncovered parking spaces as well. If demolishing a driveway parking spot to build your ADU, the city cannot require you to replace it.

AB 462: Coastal Zone + Disaster Relief. For properties in the Coastal Zone, local agencies with a certified Local Coastal Program must approve or deny a CDP application for an ADU within 60 days, and the appeal to the Coastal Commission has been eliminated. For wildfire-affected areas, a detached ADU can now receive a Certificate of Occupancy before the primary dwelling is rebuilt.

⚠️ Pro-Tip: State law creates a floor, not a ceiling. Cities can be more generous than state law (like West Hollywood eliminating parking requirements entirely) but they can't be more restrictive below certain thresholds (like preventing an 800-square-foot ADU). When your city's rule conflicts with state law, the more permissive standard generally wins. But confirming which standard applies to your specific project with your city's planning department before you design is always the right move.

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What It Actually Costs to Build an ADU in 2026

Cost varies dramatically by ADU type, finish level, and city. Here are the ranges we're seeing across our project portfolio in early 2026.

ADU Type	Cost Range	Key Variables
Garage Conversion	$80,000 – $130,000	Structural condition of existing garage, utility connections, finishes
Detached New Build (standard)	$150,000 – $300,000	Size, foundation conditions, site access, utility distance
Detached New Build (high-end)	$300,000 – $400,000+	Premium finishes, complex site, Beverly Hills design requirements
Attached Addition	$135,000 – $250,000	Integration with existing structure, foundation capacity
Prefab/Modular	$120,000 – $250,000	Manufacturer, site preparation, utility hookups, permitting
JADU (interior conversion)	$40,000 – $80,000	Existing condition, kitchen/bath scope, accessibility

Hidden Costs to Budget For

Title 24 energy compliance. The 2025 Energy Code (effective January 1, 2026) adds $4,000 to $8,000+ to ADU construction costs through updated insulation requirements, heat pump encouragement, potential solar PV and battery storage, and mandatory HERS testing. We wrote a detailed breakdown of Title 24 compliance costs in our companion article.

Utility upgrades. Depending on your property's existing electrical panel capacity and water/sewer connections, LADWP or your local utility may require upgrades. Budget $5,000 to $15,000 as a contingency.

Permit and plan check fees. Varies by city but typically $3,000 to $8,000 for plan check, permit, and inspection fees combined.

Energy consultant fees. The CF-1R compliance documentation and energy modeling required for Title 24 runs $500 to $2,000 depending on complexity.

HERS testing. Full HERS testing packages for ADU projects typically run $700 to $1,500. See our Title 24 article for a detailed breakdown of individual test costs.

Site survey and soils report. Most new-build ADUs require a site survey ($500 to $1,500) and many require a soils/geotechnical report ($1,500 to $3,500), especially in hillside areas.

Rental Income Potential

For context on the investment case, here are approximate monthly rental ranges for ADUs by area in 2026:

Area	Monthly ADU Rent Range
Beverly Hills	$2,800 – $4,200+
West Hollywood	$2,400 – $3,600
West LA / Santa Monica adjacent	$2,800 – $4,200
Silver Lake / Echo Park	$2,000 – $3,200
San Fernando Valley	$1,800 – $2,800

At these rent levels, most well-planned ADUs reach break-even within 5 to 8 years and add an estimated $200,000 to $500,000 in property value upon completion.

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How We Approach ADU Projects at California Construction & Remodeling Experts

We've published a separate comprehensive guide to ADU permitting in Los Angeles that covers the full LADBS process, the 60-day fast-track protocol, and the Standard Plan Program in detail.

This article exists because the city-by-city differences are where homeowners lose money. A one-size-fits-all ADU approach doesn't work when Beverly Hills caps detached units at 650 square feet by local code and West Hollywood requires a 6-foot building separation that your Beverly Hills or LA site plan wouldn't account for.

Here's how we handle it:

Step 1: Feasibility assessment. Before any design work, we pull your property's zoning, overlay, and hazard classifications from the appropriate system (ZIMAS for LA, the Beverly Hills Zoning Code, or the West Hollywood Municipal Code). We confirm which rules apply to your specific parcel.

Step 2: Pre-approved vs. custom evaluation. We assess whether a pre-approved plan meets your needs. If it does, we move to permitting immediately. If your lot has site constraints that require a custom design, we budget for the additional architectural and plan check time.

Step 3: Integrated compliance. We coordinate Title 24 energy compliance, seismic requirements, and any fire hazard zone conditions simultaneously with ADU design. Our companion articles on California's seismic, energy, and fire code trifecta and Title 24 compliance costs show how we approach these overlapping requirements.

Step 4: Transparent estimating. Every ADU estimate we produce includes line items for construction, permits, Title 24 compliance, utility upgrades, HERS testing, and contingency. No surprises between signing and final inspection.

If you're considering an ADU in Los Angeles, Beverly Hills, or West Hollywood and want to know exactly what your city requires and what it will cost, the consultation is free. We'll tell you which rules apply to your property and which path gets you permitted fastest.

About the Author

This guide was produced by the expert team at California Construction & Remodeling Experts. Specializing in high-end Los Angeles renovations, ADU construction, and structural safety, we bridge the gap between architectural vision and complex California building codes. We are fully licensed ( CSLB #1130438 ), bonded, and dedicated to transparent, code-first construction for homeowners across Los Angeles, Beverly Hills, West Hollywood, and the greater LA area.

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