How much does an ADU cost in Los Angeles in 2026?

Most detached LA ADUs land between $300K and $500K all-in. Garage conversions typically run $160K–$260K. We hand over a one-page feasibility note with a real number before any contract.

Do you handle LADBS permits?

Yes — full plan set, structural calcs, Title 24 energy compliance, and the LADBS back-and-forth so the homeowner only signs at the milestones.

How big can my detached ADU be in the Valley?

State law guarantees up to 1,200 sqft on a single-family lot, regardless of local FAR limits. Most Valley lots can fit a 1,000–1,200 sqft 2BR detached unit.

Do I need a Mulholland Specific Plan review?

Only if your parcel is inside the Mulholland Scenic Parkway Specific Plan boundary — primarily the south-facing ridgeline of Sherman Oaks, Encino, and Tarzana. We check the parcel on the first walk.

San Fernando Valley ADU Builder.

We design, permit, and build accessory dwelling units across Greater Los Angeles — detached backyard ADUs, attached additions, garage conversions, and JADUs. One team, one number to call, from the first feasibility walk through the final LADBS inspection.

The Valley is the most predictable corner of LA city for an ADU permit. Standard R1 lots, flat topography, and LADBS's online portal mean state ADU law applies cleanly with no neighbor notice and no discretionary review. The two variables are the Mulholland Scenic Parkway Specific Plan (south-side hillside parcels) and Very High Fire Hazard Severity Zones.

San Fernando Valley cost band — 2026

$400 – $525 / sqft installed

Lot access, slab condition, panel upgrade, and finish level move the number most. Pre-approved plans trim 5–10%.

San Fernando Valley permit clock

6–10 weeks ministerial

Plan on 3–5 months for design + LADBS permit, then 4–6 months on-site for an 800–1,000 sqft detached ADU.

Scope — start to keys.

Site walk, feasibility note, and zoning / LAR1 / RD overlay check
Full architectural plan set, structural, MEP, Title 24 energy
LADBS or local-city permit submittal and back-and-forth
Foundation, framing, MEP rough, finishes, landscape tie-in
Final inspection, certificate of occupancy, and warranty

What changes about the permit here.

Ministerial review under LAMC §12.22-A,33 — no public hearing.
Detached rear-yard ADUs fit standard 50×150 lots without variances.
VHFHSZ parcels require Chapter 7A ignition-resistant exterior assemblies.
Mulholland Specific Plan parcels need a separate Director's Determination before LADBS.

What moves the San Fernando Valley number.

Most predictable cost in our service area — flat lots, easy crane / concrete access.
Chapter 7A fire-rated assemblies add $18–35k in materials on VHFHSZ parcels.
Mulholland Specific Plan parcels add design + filing fees, not construction cost.
LADWP service drop runs $4–12k depending on existing main panel.

In short.

How much does an ADU cost in Los Angeles in 2026?: Most detached LA ADUs land between $300K and $500K all-in. Garage conversions typically run $160K–$260K. We hand over a one-page feasibility note with a real number before any contract.
Do you handle LADBS permits?: Yes — full plan set, structural calcs, Title 24 energy compliance, and the LADBS back-and-forth so the homeowner only signs at the milestones.
Can I build an ADU in a hillside zone?: Usually yes, but Hillside Ordinance grading and access rules add design time. We've built in Silver Lake, Mt. Washington, Hollywood Hills, and the Palisades — geotech and shoring are part of the workflow.
How big can my detached ADU be in the Valley?: State law guarantees up to 1,200 sqft on a single-family lot, regardless of local FAR limits. Most Valley lots can fit a 1,000–1,200 sqft 2BR detached unit.
Do I need a Mulholland Specific Plan review?: Only if your parcel is inside the Mulholland Scenic Parkway Specific Plan boundary — primarily the south-facing ridgeline of Sherman Oaks, Encino, and Tarzana. We check the parcel on the first walk.

More we build in San Fernando Valley.

ADU Builder in nearby LA areas.

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