ADU design, permits and construction in Santa Monica

Charcoal stucco garage conversion ADU beside a side yard (Santa Monica ADU Builder Pros)

Design-build ADU services

Every ADU Service We Offer in Santa Monica

Some owners need only drawings and a permit. Others want a builder to take the project from survey to final inspection. Here is everything we offer for ADUs in Santa Monica and the LA neighborhoods next to it.

All ADU services

Santa Monica ADU Services

Detached ADU Construction

New freestanding cottages behind the main house, built up to two stories and 24 feet under Santa Monica's standards, with one or two bedrooms, a full kitchen and a private entry from the yard or alley.

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Freshly stuccoed ADU exterior wall before landscaping (Santa Monica ADU Builder Pros)

Attached ADU Construction

Units that join your house along one wall yet run as a separate household, with fire-rated separation, sound control and a separate door, often tied into the house's existing utilities.

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Open-plan ADU with new plank flooring and a kitchen wall (Santa Monica ADU Builder Pros)

Garage Conversion ADU

Old alley garages rebuilt from the slab up into studios and one-bedroom units. Structural repair, insulation, windows and plumbing are included, and the city does not require replacement parking.

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Garage being converted to an ADU, with new framing and a mini excavator on site (Santa Monica ADU Builder Pros)

Junior ADU (JADU)

Small units of 500 square feet or less made from a bedroom, suite or attached garage inside a single-family house, with an exterior door and an efficiency kitchen.

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White vanity and LED mirror in a new bathroom (Santa Monica ADU Builder Pros)

Prefab ADU Installation

Site preparation, foundations, crane coordination and utility hookups for factory-built ADUs, so a modular or panelized unit can be set and inspected on your lot.

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Finished detached ADU with charcoal stucco and a modern entry door in a backyard (Santa Monica ADU Builder Pros)

Multifamily ADU Construction

On duplex and apartment properties: new freestanding units plus storage or garage conversions, planned around tenants and the city's rent control considerations.

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ADU kitchen seen from the entry door, with stainless appliances, (Santa Monica ADU Builder Pros)

ADU Design and Plans

Surveys, layouts, elevations, structural and energy work drawn to Santa Monica's objective standards, or a city preapproved plan adapted to the specifics of your parcel.

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Painted vaulted ADU living space before flooring (Santa Monica ADU Builder Pros)

ADU Permits and Approvals

Complete submittals to the City of Santa Monica or LADBS, plan check responses, coastal steps and deed restrictions tracked from application through permit issuance.

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Open stud walls with new electrical rough-in during ADU construction (Santa Monica ADU Builder Pros)

ADU Foundations and Utilities

Footings and slabs, trenching, sewer laterals, water service, electrical panel and service upgrades with SCE or LADWP, and fire sprinklers when the code calls for them.

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Crew member on new roof sheathing during an ADU build (Santa Monica ADU Builder Pros)

ADU Kitchens and Bathrooms

Full ADU kitchens, JADU efficiency kitchens and compact bathrooms designed for small floor plans, coastal moisture and long-term tenants or aging family members.

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Compact kitchen with gray shaker cabinets and a gas range (Santa Monica ADU Builder Pros)

Picking the Right ADU Type for Your Santa Monica Lot

What kind of unit to build comes first, and the property usually makes that call for you. A deep lot north of Montana can take a two-bedroom backyard cottage. A narrow Ocean Park parcel points toward building over the garage. A small Sunset Park house with an old garage out back is a natural conversion. A duplex in Wilshire Montana or an apartment building in Mid-City falls under the multifamily rules.

We look at the lot, the existing buildings, the alley, the utilities and your goal before recommending a type. Sometimes the answer is more than one unit, phased over several years, since the city lets several ADU types share a single-family parcel.

Bathroom with tub surround tile in progress (Santa Monica ADU Builder Pros)

ADU Design, Permits and Construction Under One Contract

Splitting an ADU between a designer, an expediter and a contractor works, but it puts the owner in the middle when something goes wrong. When the same team draws the plans, gets the permit and builds the unit, the drawings are made to be built and the field crew knows why each detail is there.

You can still hire us for one piece. Some owners come with plans in hand and need a builder. Others want design and permits only. Every service below can stand alone or be combined.

  • Site review and feasibility
  • Design and engineering
  • City or LADBS permits
  • Site work and utilities
  • Construction through final inspection

Santa Monica ADU Rules That Shape Every Service

A few local facts run through every service we offer. ADU approval in Santa Monica is ministerial under Municipal Code Section 9.31.025, so a compliant project needs a building permit and no hearing. Detached units may reach two stories or 24 feet. No on-site parking is required. Rentals must be longer than 30 days, and owners do not have to live on the property.

Two overlays change the path for some lots. Coastal Zone parcels can need Coastal Commission approval or a waiver. Homes on the California Register of Historical Resources may face added standards. And for addresses in Santa Monica Canyon, Venice, Mar Vista or Sawtelle, all of which are in Los Angeles, LADBS and LA's ADU rules apply instead.

How ADU Costs Come Together in Santa Monica

We do not list prices, because each lot changes the math. Converting an existing structure usually costs less than building new. Utility distance, panel capacity, soils, access and finish level move the total from there. Units of 750 square feet or less avoid impact fees under state law, which can steer design decisions.

After a site review, we give you a scope and budget for the services you need. If a different ADU type would serve your goal at lower cost, we will say so before you commit.

FAQs

ADU Service Questions in Santa Monica

Can I hire you just for ADU design and permits in Santa Monica?

Yes. Each service can be hired alone. Many owners start with design and permits and decide on construction once they see the approved plans and budget.

What is the lowest-cost way to add an ADU in Santa Monica?

A junior ADU inside the house usually costs the least, followed by a garage conversion when the garage is sound. New detached and two-story units cost more because everything is built from the ground up.

Do you build ADUs outside Santa Monica city limits?

Yes. Four Los Angeles neighborhoods are on our list as well: Sawtelle, Mar Vista, Venice and Santa Monica Canyon. Those projects follow LA's ADU ordinance and are permitted by LADBS.

Can I combine more than one ADU on my lot?

Often, yes. Stacking types is normal here: a garage conversion plus a junior unit plus a new cottage is a permitted mix on one house lot, and R1 zoning opens a fourth slot with a deed restriction. Apartment lots use a different formula.

Wood framing for a backyard ADU (Santa Monica ADU Builder Pros)

ADU consultation

Request an ADU Service Consultation in Santa Monica

Tell us which services you need and what is on your lot now. Every form gets a response from us within 24 hours.

  • Design
  • Permits
  • Construction

Request an ADU Consultation

We will reach out via phone or email within 24 hours.