ADU builders in Santa Ana

Santa Ana has Orange County's best old housing stock — 1920s Craftsman and Spanish revival in Floral Park and French Park — plus dense postwar blocks with real ADU demand. Historic-district work needs design care and texture matching; that's craft we bring from LA's oldest neighborhoods.

ADUs & Garage Conversions · Santa Ana

Why Santa Ana homes bring this work to us

Santa Ana pairs OC's strongest rental demand with lots that can actually hold a unit. In Floral Park and the historic districts we design ADUs to pass design review — matched rooflines, matched stucco — so the approval goes through and the neighborhood stays the reason you bought there.

We run Orange County projects in scheduled blocks from our LA base — no trip charges, same crews, same license.

Neighborhoods we work in

Floral ParkFrench ParkWashington SquarePark SantiagoDelhi

ZIP codes: 92701–92707 · Serving all of Santa Ana and the surrounding Orange County.

What's included

ADUs we build in Santa Ana

Detached new-build ADUs

A complete small home in your backyard — foundation, framing, systems, and finishes, up to 1,200 sq ft under state law.

Garage conversions

The fastest, most affordable path to a rentable unit: foundation checks, insulation, systems, and a finish that doesn't feel like a garage.

Attached ADUs & JADUs

Additions and junior units carved from existing space, with the required separate entrance and kitchen done to code.

Guest houses & casitas

Not every backyard building needs a full kitchen — we build casitas, studios, and offices to the same standard.

Site work & utilities

Trenching, sewer connections, panel upgrades, and meters — the part of ADU budgets everyone forgets. We price it up front.

Plans, engineering & permits

Architectural plans, structural engineering, Title 24, and city plan check — or we build from the plans you already have.

$100k–$180k
Typical garage conversion, turnkey
$250k–$400k+
Typical detached ADU, turnkey
$1,800–$2,800/mo
Typical SFV ADU rent today

Typical 2026 Los Angeles-area ranges including construction; plans, permits, and utility fees vary by city and site. Many owners see the unit pay for itself in 7–12 years of rent.

FAQ

Questions we hear a lot

Who handles building permits in Santa Ana?

Permits here go through the City of Santa Ana's Planning & Building Agency — including extra design review in its historic districts, which we prepare for up front. We prepare the plans, pull the permits, and meet the inspectors — you never stand in a city line.

What does an ADU cost in Santa Ana?

Turnkey garage conversions typically run $100k–$180k and detached new-build ADUs $250k–$400k+ — Santa Ana sits squarely in those ranges. Utilities and site conditions move the number, which is why we start with a free site check and give you a written, line-item price.

How fast can you get to Santa Ana?

We run Orange County projects in scheduled blocks from our LA base — no trip charges, same crews, same license. Estimates are free and come back as a written, line-item scope — not a guess over the phone.

Also in Santa Ana

Nearby city guides

Free estimate

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Free on-site estimates. Straight answers on price, permits, and timeline — no runaround.

(213) 858-9161 Call or text — English y español.

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