City dossier

Los Angeles County

Building an ADU in Los Angeles.

⊕ 34°03′ N · 118°14′ W

Los Angeles is the most permissive ADU jurisdiction in California by volume — the city issued more than 7,000 ADU permits in 2024 alone. The friction is fee stacking and plan-check queues, not zoning. If your lot is single-family-zoned and not in a coastal or hillside overlay, the path is well-trodden.

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The numbers

At a glance.

Four data points to anchor every conversation you'll have with a contractor, architect, or permit expediter in Los Angeles.

Typical permit fee $6,500

City permit + plan-check fee for a mid-size ADU. Excludes school & impact fees.

+$700 vs LA-area median
Permit timeline 12–26 wks

From a complete application to permit issuance. Plan-check rounds can extend this.

Los Angeles portal · 2026-05
Rent (1-bed ADU) $1800–$3500

Long-term rental range, market rate, 2026 estimates.

2026 rent surveys
Median lot 5500 sf

Typical single-family parcel — your lot determines what's physically possible.

LA County Assessor
The local rule

The rule that matters.

Rule · Los Angeles

LA's ADU Standard Plans Program publishes pre-approved plan sets from a roster of architects. Choosing one cuts plan-check time by roughly half — typical issuance drops from 14 weeks to 6–8.

Every California city must comply with the statewide ADU framework, but each one has a local quirk — a program, an overlay, or an interpretation — that changes the math. This is the one to read first for Los Angeles.

Permits & fees

Fees, decoded.

Your city's permit fee is the visible cost. Impact fees and utility connection fees are where projects get expensive without warning — read this carefully.

Permit + plan-check fee
$6,500
Processing window
12–26 weeks (application to issuance)
City planning portal
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Impact fees

ADUs under 750 sqft are exempt from impact fees. Over 750 sqft, LAUSD charges school fees prorated to the difference (~$5.17/sqft as of 2026). Water and sewer connection fees apply unless you tie into the primary residence.

Cost ranges

What it costs in Los Angeles.

Standard-finish, default-size totals for each ADU type — including Los Angeles's permit fee, soft costs, utility hookups, and a 10% contingency.

Detached new construction 800 sqft · Standard finish
$348k—$459k
  • Build & finishes$288k–$368k
  • City permit$6k
  • Soft costs$14k–$29k
  • Utilities$8k–$14k
  • Contingency (10%)$31k–$41k
Property value uplift+$250k–$350k
Attached new construction 600 sqft · Standard finish
$230k—$314k
  • Build & finishes$186k–$246k
  • City permit$6k
  • Soft costs$9k–$19k
  • Utilities$8k–$14k
  • Contingency (10%)$20k–$28k
Property value uplift+$250k–$350k
Garage conversion 400 sqft · Standard finish
$112k—$160k
  • Build & finishes$84k–$116k
  • City permit$6k
  • Soft costs$4k–$9k
  • Utilities$8k–$14k
  • Contingency (10%)$10k–$14k
Property value uplift+$250k–$350k

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Adjacent dossiers

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