Greater Los Angeles · Los Angeles County
Building an ADU in Long Beach:
cost, timeline, financing, ROI.
The cheapest LA-County coastal labor market with same-day permits on the city's pre-approved plans.
Every dollar figure on this page is sourced — see the references at the bottom. Last verified: May 2026.
01 · Cost
What ADUs cost in Long Beach
Total all-in costs for a typical 750 sq ft mid-finish build, by ADU type. Long Beach runs $350–$500 per square foot for new detached construction in 2026.
| ADU type | Typical 2026 range |
|---|---|
Detached ADU Mid-finish, 750 sq ft. Coastal Zone parcels add a Coastal Development Permit step. | $260,000–$375,000 |
Attached ADU | $225,000–$340,000 |
Garage conversion | $120,000–$185,000 |
Junior ADU (JADU) | $50,000–$100,000 |
Prefab (installed) | $225,000–$300,000 |
02 · Permits & timeline
How ADU permits work in Long Beach
A summary of fees and the approval process. Total all-in permit cost typically runs $3,000–$8,000+; 60-day statutory ministerial review; 2–4 months typical. Pre-approved PAADU plans are eligible for same-day, over-the-counter permit issuance. For the full Long Beach permit guide, see the link at the bottom of this section.
Fee breakdown
- $1,000–$2,000
Building permit fee (valuation-based)
- ~65% of building permit fee
Plan check
- $0 under 750 sq ft
Impact fees
Scaled proportionally above 750 sq ft (LA County standard).
- $1,500–$5,000
Utility connection (LB Water + sewer)
Size limit
1,200 sq ft (detached); attached capped at 50% of primary home (800 sq ft guaranteed minimum statewide); JADU capped at 500 sq ft.
Setbacks
4 ft side/rear for new detached ADUs (state-preempted); 0 ft for conversions of legal existing structures. Height: 16 ft generally, up to 25 ft within 0.5 mi of transit.
Parking
Waived within 0.5 mi of transit, one block of a car-share location, in historic districts, or for any conversion. Long Beach publishes a Parking Exempt Area Map covering most of the city.
Pre-approved plans
AvailablePre-Approved ADU Program (PAADU): homeowners select a plan and the designer issues a license — over-the-counter permit issuance available.
City program pageAmnesty / legalization
AvailableLong Beach administers legalization under state AB 2533; a formal city amnesty ordinance was under public review in late 2025.
City program pageLooking specifically for Long Beach ADU permit fees, the full timeline, or current city requirements?
Full Long Beach ADU permit guideWhat's different about Long Beach
Local rules that move budgets and timelines
State law preempts most ADU rules — but every city has a few quirks worth knowing before you spend money on design.
- 01
Coastal Zone parcels (Belmont Shore, Naples, Peninsula) require a Coastal Development Permit on top of the standard ADU permit — material time and cost addition.
- 02
Historic District parcels require a Certificate of Appropriateness from the Cultural Heritage Commission.
- 03
Long Beach's Garage Conversion Standards program supports over-the-counter permit issuance for code-compliant garage-to-ADU conversions.
03 · Financing
How Long Beach homeowners pay for an ADU
A typical Long Beach build of ~$275K is rarely paid in cash. Five common instruments — pick the one matched to your equity, timeline, and income profile.
HELOC
Best for: Owners with $200K+ equity and a fast timeline.
Variable-rate line of credit secured by your home. Funds available in 2–6 weeks; interest-only payments during draw.
Cash-out refinance
Best for: Long-term owners locking in a lower blended rate.
Refinance your primary mortgage at a higher loan amount and take the difference as cash. Closing costs 2–5% of total loan.
Construction-to-perm
Best for: Owners without sufficient equity for a HELOC.
Single closing covers construction draw + permanent mortgage on completion. Fannie Mae & Freddie Mac now allow projected ADU rental income toward qualification.
RenoFi loan
Best for: Owners short on equity who need to borrow against ADU after-build value.
Underwrites against your home's projected post-renovation value. Typically 30-year fixed, higher rate than HELOC.
CalHFA ADU Grant
Best for: Lower-income California homeowners covering soft costs.
Up to $40,000 forgivable grant for predevelopment (site work, design, permits). Subject to availability and income limits.
Compare full monthly payment math for your scenario:
Run the loan calculator04 · ROI
Does an ADU in Long Beach pencil out?
Simple-payback math, anchored to Long Beach's May 2026 rental data and a typical mid-finish detached build. This is the dumb-but-honest version — not IRR — so you can sanity-check it on a napkin.
Typical build
$275,000
Monthly rent (1BR)
$1,900
Annual rent
$22,800
Simple payback
12 years
The fuller math
- Cash flow first. A $1,900/mo rent on a $275K build is roughly 8.3% gross yield. Subtract financing cost, vacancy, and operating expenses for the net.
- Property value uplift. A permitted ADU typically adds 50–70% of build cost to appraised home value in the short term — and 80–100% once rental income is documented (FHFA, 2025).
- Why this number is a floor. Simple payback assumes flat rent forever and no appreciation. Real returns include rent escalation, tax benefits, and home value gain — all of which improve the picture.
Rent source: Zillow Rentals, May 2026 (studio $1,595/mo median, 1BR $1,895/mo median).
Run the full ROI calculatorFAQ
The questions Long Beach ADU homeowners ask first
- How much does it cost to build an ADU in Long Beach?
- A typical 750 sq ft mid-finish detached ADU in Long Beach runs $260,000–$375,000, or about $350–$500 per square foot. Long Beach labor rates run below other LA County coastal cities, making it one of SoCal's more affordable build markets. Garage conversions land at $120,000–$185,000.
- What are Long Beach ADU permit fees?
- Direct permit and plan-check fees in Long Beach run about $3,000–$8,000 for a 750 sq ft detached ADU. Building permit fees are valuation-based (~$1,000–$2,000), plan check is ~65% of that, and utility connection runs $1,500–$5,000. Impact fees are waived under state law for ADUs below 750 sq ft.
- How long does an ADU permit take in Long Beach?
- California's 60-day ministerial review applies. Standard custom-design ADUs in Long Beach typically clear permits in 2–4 months. The city's Pre-Approved ADU Program (PAADU) offers same-day, over-the-counter permit issuance for plans drawn from the approved catalog — by far the fastest path.
- Are there any extra Long Beach ADU rules I should know about?
- Three. (1) Coastal Zone parcels — Belmont Shore, Naples, the Peninsula — require a Coastal Development Permit on top of the building permit, which can add weeks. (2) Historic District parcels need a Certificate of Appropriateness. (3) Long Beach's parking exemption area is broad — most of the city qualifies for parking waivers under state law.
- What rent can a Long Beach ADU earn?
- Per Zillow Rentals data from May 2026, Long Beach studios rent for a median $1,595/mo and 1-bedrooms for $1,895/mo. Demand is reinforced by Cal State Long Beach students and downtown commuters; the rental market typically clears 1BR units within 30 days.
Compare
How other California cities stack up
We track ADU cost, permits, and rent for these markets too. Click through for a same-shape breakdown.
San Francisco Bay Area
Oakland
Bay Area rents and a free city plan catalog — but Oakland Hills fire-zone parcels carry extra cost.
Sacramento Region
Sacramento
The most transparent ADU fee data in California — line-item permits published by the city, total under $6K at 750 sq ft.
Central Valley
Fresno
California's lowest absolute build costs and five free pre-approved plans — but rent yields lag coastal markets.
North Bay
Santa Rosa
North Bay rents on a Sonoma County footprint — strong demand, but WUI fire zones add real construction cost.
Greater San Diego
San Diego
California's deepest published cost data — SnapADU's project-tier pricing makes San Diego the easiest CA city to budget for.
San Francisco Bay Area
San Francisco
Highest build costs AND highest rents in California — but lot constraints, DBI delays, and historic review make SF a power-user project.
San Francisco Bay Area
San Jose
The Bay Area's strongest ADU ROI — same-day permits for pre-approved plans, tech rental demand, and Bay Area rents without SF's build-cost premium.
Greater Los Angeles
Pasadena
California's deepest 2025 fee reductions — Pasadena ADUs ≤900 sq ft can save 25–50%+ of city fees with a Housing Agreement.
Greater Los Angeles
Los Angeles
California's largest ADU market: 80+ free pre-approved Standard Plans, the deepest builder bench, and LADBS fees among the lowest of any major CA city.
San Francisco Bay Area
Berkeley
UC Berkeley demand keeps vacancy near zero; an active 2025–2028 amnesty program legalizes pre-2020 unpermitted ADUs without enforcement penalties.
Orange County
Irvine
Highest 1BR rent of any city we cover — but HOA-heavy master-planned communities and Orange County build costs make the math demanding.
Greater Los Angeles
Glendale
Sits between LA and Pasadena geographically; ADUs ≤750 sq ft escape a ~$5K impact fee, but the citywide 1,000 sq ft cap is stricter than state default.
Inland Empire
Riverside
California's strongest ADU payback math — Inland Empire labor runs 30–40% below coastal CA, and rents stay liquid.
Greater Los Angeles
Santa Monica
Premium West LA rents and tight lot supply — but Coastal Zone permitting, seismic retrofits, and pre-1940 housing stock make Santa Monica a power-user project.
Match me with Long Beach builders
Calculators get you in the ballpark.
Builders walk your lot.
We'll match you with 2–3 ADU-specialist builders in Long Beach, briefed on your project specifics. Most homeowners hear back within 48 hours.