Multifamily ADUs | SB 1211 Apartment Conversions | ADU West Coast
Two-story multifamily ADU with warm exterior lighting, wood accents, and landscaped walkway at dusk
MAXIMIZE YOUR PROPERTY. INCREASE YOUR RETURNS.

Multifamily
ADUs in California

California's SB 1211 streamlines ADU development for owners of apartment buildings. Add up to 8 new units, increase cash flow, and create long-term value.

100+
ADUs Designed & Built
5.0
Average Rating on Google
15+
Years of Local Experience
120+
Cities Served

Why Add ADUs to Your Multifamily Property?

Add up to 8 detached ADUs per lot
Convert non-habitable space into rentable units
No replacement-parking requirement
One licensed team — CSLB #1064076
13–16 month average, contract to keys
SB 1211 MADE SIMPLE

SB 1211 removes barriers for multifamily
owners. We handle the details so you
can focus on returns.

What SB 1211 Changed for Multifamily Owners

Effective 2026, SB 1211 dramatically expands what you can build on existing apartment and multifamily properties.

8
MORE DETACHED ADUS

Build up to eight detached ADUs per lot, capped at your number of existing primary units.

25%
CONVERT EXISTING SPACE

Turn storage rooms, garages, and non-habitable space into units — up to 25% of existing units.

0
NO PARKING REPLACEMENT

Convert uncovered parking to ADUs without being forced to replace those spaces.

How It Works

1
SITE REVIEW

We tell you how many ADUs SB 1211 allows on your lot.

2
DESIGN & PLANS

Architecture, engineering, and unit layout handled.

3
PERMITS

We manage submittal and approvals.

4
BUILD

One licensed team, contract to keys.

YOUR PROJECT, OUR PRECISION

Built to Code.
Designed to Last.

ADU West Coast manages architecture, engineering, permitting, and construction under one roof.

One team. One process.
One standard: Excellence.

We bridge the gap between your vision and city approval, delivering spaces that are beautiful, functional, and built to perform for years to come.

Warm, modern ADU kitchen and living area with wood floors, pendant lighting, and lush landscaping visible through glass doors
Southern California coastline at dusk with hillside lights
ADU West Coast mark

Turn your property
into more income

SPEAK WITH AN EXPERT(714) 253-7369

Hassle-free permit process

Warm ADU dining and living area with wood table, pendant lighting, plants, and glass doors to a garden
"
As a Costa Mesa-based realtor working throughout LA and Orange County, ADU West Coast has become my go-to recommendation whenever ADUs come up — especially for multifamily properties.

On a recent Long Beach project, Cameron personally conducted a site inspection and provided a detailed feasibility analysis covering unit count, setbacks, parking, and realistic build costs before any commitment was made.

My client ultimately moved forward, and ADU West Coast successfully designed and built 4 ADUs while handling plans, permits, and construction entirely in-house.

The project was completed on time, on budget, and communication throughout the process was excellent, with consistent updates and daily coordination. For any realtor or multifamily owner exploring ADU opportunities in LA or Orange County, I highly recommend ADU West Coast.
Tay
See all 35+ Google Reviews
PERMIT GUIDANCE YOU CAN COUNT ON

Hassle-free permit process from start to finish.

FULL-SERVICE DESIGN-BUILD EXPERTISE

One team handles every detail from concept to keys.

SERVING MULTIFAMILY OWNERS ACROSS SOUTHERN CALIFORNIA

Local knowledge. Proven results.

See if My Property Qualifies

Tell us a bit about your property and goals. We'll get back to you ASAP and guide you in the right direction.