South Bay · LA County

ADU permits in Hermosa Beach

Zip codes:90254

Hermosa Beach is a tightly-packed coastal city of about 19,500 people in the South Bay, between Manhattan Beach and Redondo Beach. The city runs its own building and planning departments. Lots are unusually small (typically 30 ft wide), and almost the entire city is within the California Coastal Zone — making Coastal Development Permit (CDP) requirements a defining feature of every Hermosa Beach Accessory Dwelling Unit (ADU) project.

Independent city — not LADBS

Hermosa Beach runs its own building department. Permits go through Hermosa Beach Community Development Department ↗, not the Los Angeles Department of Building and Safety (LADBS). Our address checker pulls real zoning + overlay data for any Los Angeles County address. The Hermosa Beach ordinance breakdown below covers the city-specific permit path.

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Hermosa Beach by the numbers

Rounded figures from the 2020 US Census, LA County Assessor parcel data, and the city's own published reports. Estimates only — your specific lot can vary widely.

Population

19,500

2020 Census

Single-family homes

~5,800

LA County Assessor

Median lot size

2,700 sqft

Approximate

Median home value

$2.4M

Zillow / Redfin

What makes Hermosa Beach different

Hermosa Beach's ADU ordinance is in Hermosa Beach Municipal Code Chapter 17. The walk streets between Hermosa and Manhattan and the Strand-adjacent blocks have especially tight lot dimensions. Coastal Development Permit (CDP) applies to virtually every parcel — the city processes the CDP with appeal jurisdiction to the California Coastal Commission.

Hermosa Beach ADU ordinance — the rules that apply

Last verified: 2026-05-12

The current ADU rules in Hermosa Beach, sourced from the city's published ordinance and verified against CA Government Code §65852.2 (which preempts local rules stricter than state baselines). When you see "state default," that means the city can't reduce below this number under state law.

Max detached ADU size	1,200 sqft (state default)
Max ADU height	16 ft / 18 ft with second-story setbacks
Setbacks	4 ft side / 4 ft rear (state minimum)
Coastal Development Permit (CDP)	Required for virtually all parcels Adds 3-9 months and $1K-$3K on top of building permit.
Floor Area Ratio (FAR) cap	Combined FAR for primary + ADU is capped per zone Often the binding constraint on tiny Sand Section / Strand-adjacent lots.
Local processing time	60 days plan check; CDP runs in parallel
Pre-approved standard plans	None city-specific

Source: Hermosa Beach Community Development Department ↗

Active overlays + extra rules in Hermosa Beach

City overlays + state-level designations that hit a meaningful share of Hermosa Beach parcels. Each affects what you can build, how long it takes, or how much it costs.

California Coastal Zone

~95% of parcels

Near-universal in Hermosa Beach. CDP required.

Strand-adjacent FAR caps

~18% of parcels

Strand-front lots face the tightest combined FAR caps. Most Strand ADUs end up below the 1,200 sqft state max because FAR runs out.

Walk Street design context

~12% of parcels

Walk-street-adjacent lots face additional design-context review for compatibility with the pedestrian-only blocks.

Watch-outs specific to Hermosa Beach

Patterns we see across Hermosa BeachADU permits. None are dealbreakers — they're just the things people get wrong most often.

01
Lot widths are tiny — narrow plans only
Typical Hermosa Beach lots are 30 ft x 90 ft. After 4 ft side setbacks and the primary house, an Accessory Dwelling Unit (ADU) often won't fit as a standalone structure. Attached or above-garage Junior ADUs are usually the only feasible options.
02
Coastal Development Permit is the schedule risk
Building permit timelines are reasonable in Hermosa Beach. The CDP is the long pole — 3-6 months, plus a 49-day appeal window where the California Coastal Commission can pull jurisdiction. Plan construction starts around the CDP.
03
ADU rentals fit the short-term tourism market — verify city rules
Hermosa Beach has detailed short-term rental rules. Long-term ADU rental is straightforward; short-term rental of an ADU you don't live in is largely prohibited.

Plans that fit Hermosa Beach lots

Hermosa Beachdoesn't maintain a city-specific pre-approved plan library the way the Los Angeles Department of Building and Safety (LADBS) does. California Department of Housing and Community Development (HCD)-approved prefab (which bypasses local plan check) and custom designer plans are the main paths:

Connect Homes

ADU14 · ADU15

HCD-certified — skips local plan check.

View Connect Homes →

Cover

ADU77 · ADU78 · ADU79

HCD-certified — skips local plan check.

View Cover →

Amenities + civic services in Hermosa Beach

Parks, libraries, and the school district that serve the area. Context that matters for renter appeal, family relocation, and long-term resale.

Parks + sports

Hermosa Valley Greenbelt

Valley Drive, north-south through the city

Linear park along the former Santa Fe railroad right-of-way. Walking + jogging path threading the city.

Trails
Picnic

South Park

Valley Drive + 8th Street

Compact neighborhood park with playground and tennis.

Tennis
Playground
Picnic

Hermosa Beach Pier + Beach

Pier Avenue at the ocean

Iconic pier with the wide South Bay beach. Anchor of the Pier Plaza walkable district.

Volleyball
Trails

Clark Field

Valley Drive + 9th Street

Multi-sport field used for soccer, baseball, and community events.

Baseball
Soccer
Picnic

Libraries

Hermosa Beach Library
LA County Library
Pier Avenue, Civic Center

Public schools

School assignments vary by exact address. The district + notable schools below cover most of the area.

District

Hermosa Beach City School District (K-8) + Manhattan Beach Unified (high school)

Notable schools in the area

Mira Costa High School (in Manhattan Beach)
Hermosa Valley School (K-8)
Hermosa View Elementary

Hermosa Beach City School District (HBCSD) handles K-8. High school students attend Mira Costa in Manhattan Beach via a long-running interdistrict agreement.

Getting around Hermosa Beach

Highly walkable + bike-friendly along the Strand. Car-dependent inland after Pacific Coast Highway.

Transit + walkability

Bus lines

Beach Cities Transit Line 109
Metro 130 (Redondo Beach to LAX)

Nearest rail

Metro C Line — Aviation/LAX Station (about 6 miles north)

Walkability

Strand + Pier Plaza are exceptionally walkable. Inland blocks east of PCH are car-dependent.

Nearby airports

Distance + type for each major Los Angeles-area airport reachable from Hermosa Beach. Useful for travel, commute, and any flight-path noise concerns on specific parcels.

Los Angeles International (LAX)
~5 mi
International
South Bay flight-path coverage. Aircraft noise affects northern Hermosa Beach more than southern.
Hawthorne Municipal Airport (HHR)
~3 mi
General aviation
Long Beach Daugherty Field (LGB)
~14 mi
Regional / domestic

Community + landmarks in Hermosa Beach

Annual events, landmarks, and the places that anchor the area's identity. Context for renter appeal and long-term resale.

Annual events

Fiesta Hermosa
Memorial Day weekend + Labor Day weekend · since 1972
Twice-yearly outdoor street fair on Pier Avenue. Live music, food trucks, craft vendors. One of the largest free street festivals in California.
Source ↗
Hermosa Beach Sand Sculpture Festival
August (one weekend)
Professional sand-sculpture competition on Hermosa Beach.
Source ↗

What makes Hermosa Beach Hermosa Beach

Landmark

Hermosa Beach Pier + Pier Plaza

1965 reinforced-concrete pier replacing the 1904 wooden original. Pier Plaza is the walkable retail + dining strip at the pier head.

Beach path

The Strand

22-mile beachfront bike path running through Hermosa, Manhattan, and Redondo Beach.

Nearby areas to Hermosa Beach

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.

Independent city

Manhattan Beach →

Premium home values support strong Accessory Dwelling Unit (ADU) economics, but small lots, Coastal Development Permit (CDP) requirements, and design-review overlays make Manhattan Beach one of the more procedurally complex South Bay cities for ADUs.

Independent city

Redondo Beach →

Wider range of Accessory Dwelling Unit (ADU) economics than Manhattan or Hermosa, with strong rental demand from the South Bay aerospace + biotech employment base. Coastal Development Permit (CDP) only applies to the strand-adjacent strip.

Frequently asked questions about Hermosa Beach ADUs

›Can I build an ADU in Hermosa Beach?

Yes. Hermosa Beach allows ADUs under its local ordinance, aligned with California Government Code §65852.2 (the state baseline that preempts overly-strict local rules). Most single-family lots can host one ADU plus one JADU. Permits go through Hermosa Beach Community Development Department, not LADBS — see the ordinance table above for the specific rules.

›How does Hermosa Beach differ from LA City for ADU permits?

Three main differences: the permit agency (Hermosa Beach Community Development Department vs. LADBS), the local ordinance details (each city has some flexibility above the state baseline), and the timeline (some cities are faster, some slower than LA's 60-day plan check). See the ordinance breakdown above for the specifics on each.

›How much does it cost to build an ADU in Hermosa Beach?

Median home value in Hermosa Beach is around $2.4M, which usually means lot economics support a quality ADU build of $200K–$400K all-in. Hillside, coastal, or VHFHSZ lots add 7–25% on top. HCD-prefab units (Connect Homes, Cover, Plant Prefab) bypass local plan check entirely and typically run $190K–$350K turnkey.

›Does Hermosa Beach have pre-approved standard plans like LA's YOU-ADU?

No. Unlike LADBS, Hermosa Beach does not maintain a city-specific pre-approved plan library. The two faster paths are an HCD-approved prefab (factory-certified, skips local plan check) or a custom designer drawing for your lot. The slower path is a fully custom architect-led design.

›Will the PermitPathLA wizard work for my Hermosa Beach address?

Yes. The wizard pulls real zoning, overlay, and parcel data for any Los Angeles County address, including Hermosa Beach. What you'll see today: feasibility for your specific lot, the overlays that apply, and a routing summary pointing at Hermosa Beach Community Development Department for the permit submittal. Deeper Hermosa Beach-specific permit walkthroughs are next on the roadmap as we expand from LADBS into the independent-city ordinances.

Ready to see what your Hermosa Beach lot can do?

Our free address checker pulls real zoning, overlay, and parcel data for any Los Angeles County address — including Hermosa Beach. Start there and we'll surface what applies to your specific lot.

Check your address →

Reviewed by Yair Harpaz, Founder, PermitPathLA. California DRE-licensed broker with 30+ years of Los Angeles real estate and mortgage industry experience.

Hermosa Beach ordinance data last reviewed May 12, 2026.

See an error or stale rule? corrections@permitpath.la

Primary sources: Hermosa Beach planning · Hermosa Beach Community Development Department permits