ADU Contractor · Lomita, CA

Building an ADU in Lomita: A Homeowner's Guide

An accessory dwelling unit can add a rental, a place for a parent, or room for a grown child on a Lomita lot. Here is what shapes the price and the timeline before you talk to any builder.

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ADU Contractor in Lomita

Pricing & What to Expect

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Service LevelCost Range
Junior ADU inside the existing house (estimate)$40,000 - $100,000
Garage conversion (estimate)$80,000 - $180,000
Attached ADU addition (estimate)$150,000 - $300,000
New detached ADU (estimate)$180,000 - $400,000+
Services & Details

ADU Contractor Services in Lomita

Which kind of ADU fits your lot

Most Lomita projects fall into one of three types: converting an existing garage, adding an attached unit to the house, or building a new detached unit in the back yard. A garage conversion usually costs the least because the slab, walls and roof already exist, though an old slab often needs work. A detached unit costs the most but gives the most privacy. A junior ADU carved out of the existing house is the smallest and cheapest option where it fits.

What actually drives the price

Utilities are the biggest surprise: running a new sewer line, upgrading an electrical panel or adding a separate meter can move a budget by tens of thousands of dollars. Site access matters too, because a back yard reachable only through a side gate means more hand labor. Finishes, a full kitchen versus a kitchenette, and whether you use a stock plan or a custom design make up most of the rest.

Permits and plan review

California state law requires cities to allow ADUs on most residential lots and sets limits on how local rules can restrict them, but each city still reviews the plans. Lomita is its own incorporated city, so start with the City of Lomita planning and building staff before you pay for full drawings. Ask about setbacks, height, parking, and any fees tied to the unit's size, then budget for at least one round of plan corrections.

Where ADU projects usually go wrong

The common failures are a design drawn before anyone checked where the sewer lateral runs, an electrical panel that cannot carry a second kitchen, and a budget that left out utility connection fees. Another is a contract that treats design, permitting and construction as one fixed price when the permit outcome is still unknown. Separate those stages on paper so you know what you are committing to at each step.

How Tegula fits in

Tegula Stone is a connector, not a builder. It helps you describe your project and reach independent local ADU professionals, who quote and contract with you directly. Tegula does not perform the work, employ the builders, or vouch for any of them, so check each candidate yourself before you sign.

FAQ

ADU Contractor in Lomita — Questions Answered

How much does an ADU cost in Lomita? +
As a rough regional estimate, a garage conversion often lands somewhere between about $80,000 and $180,000, and a new detached unit commonly runs from roughly $180,000 to $400,000 or more. The spread comes from size, utility work, site access and finishes rather than from the city itself. Get at least two itemized quotes that separate design, permit fees, utility connections and construction, because a single lump sum hides where the money goes.
How long does an ADU take in Lomita? +
Plan on months, not weeks. Design and drawings commonly take one to three months, plan review and corrections can take one to several months depending on how complete the first submission is, and construction of a detached unit is often four to eight months once work starts. Garage conversions are usually faster. Ask any builder for a written schedule with the permit stage shown separately, since that part is outside their control.
Do I need permits for an ADU in Lomita? +
Yes. An ADU is a dwelling, so it needs building permits and usually planning review, and utility work may need separate sign-offs. Contact the City of Lomita before finalizing a design to confirm current setback, height and parking rules and the fee schedule. You and the professional you hire are responsible for obtaining permits; Tegula Stone does not pull permits or manage approvals.
What should I look for in an ADU builder in Lomita? +
Ask how many ADUs they have taken from permit to final inspection, and ask to see finished units or speak with past clients. Look up their contractor license yourself on the California Contractors State License Board website and ask for proof of insurance directly, rather than relying on anyone else's claim. Ask who produces the drawings, who handles plan corrections, how change orders are priced, and what the payment schedule is tied to. A payment schedule linked to completed stages of work, rather than dates, protects you.
Can I rent out an ADU in Lomita? +
In general California law allows ADUs to be rented, though short-term rental rules vary by city and owner-occupancy rules have changed over the years. Confirm the current local rules with the city and check with your lender and insurer before you plan the unit around rental income.

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