Fast, Reliable ADU Builders Across San Marino
ADU construction in San Marino means something different than it does almost anywhere else in the San Gabriel Valley. Most lots here are 15,000 to 25,000 square feet with original 1920s – 1955 estate homes, carriage houses, and detached garages that were never built to modern code. When you call Lodgewick ADU Builders, you reach a live person, you get a written price before any work starts, and you work with a team led by Russ Delmar who has walked the Architectural Review Board process on real San Marino projects. Call (254) 602-5618 to schedule a free estimate.
Why Lodgewick ADU Builders Is San Marino’s Preferred ADU Builders Company
We earn San Marino work by being specific. Not by promising the moon. Homeowners here have told us the same stories: a contractor gave a verbal estimate, then changed the number after demo started. A crew showed up in a white van with no uniforms and no paper trail. An ADU went six months over schedule because nobody ordered the windows until the walls were framed. Lodgewick operates under The Kingswell Guarantee, which puts every commitment in writing before a single nail is driven: the price, the arrival window, the job-site standard, and the written guarantee. Russ Delmar leads the San Marino builds personally, and our crew shows up background-checked and in uniform, every time.
Here’s the Kingswell Way in plain terms: we say the price before the work, we show up in the window we gave you, we leave the place cleaner than we found it, we hand you a written guarantee, and if something fails within 365 days, we come back free. That is what ADU Builders should look like in San Marino.
ADU Construction in San Marino
ADU Construction in San Marino starts with the Architectural Review Board, not with a foundation pour. The Board can require any ADU, even a garage conversion, to match the primary estate’s historic revival style: Spanish Colonial Revival, Tudor Revival, and the other formal idioms that define the city’s housing stock. That means matching clay tile or slate rooflines, hand-troweled stucco texture, window muntin profiles, and exterior detailing before a permit is issued. A typical ADU construction project in San Marino runs $180,000 to $420,000 for a 500 – 1,000 sq ft unit, with the high end driven by custom millwork, architectural glass, and imported finish materials rather than framing labor.
Pre-Construction and Permitting
We begin with an architect-led design package that speaks the Board’s language. Generic ADU plans get rejected here. Our package includes historically sympathetic elevations, material samples, and roofline studies that anticipate what the Board will flag before you pay a permit fee.
Project Scheduling and Milestones
Long-lead items set the calendar in San Marino. Custom rift-sawn oak cabinetry, 12-foot architectural glass sliders, and imported tile can take 10 to 16 weeks from order to delivery. We order those after your written price is fixed, not before, and we sequence framing around delivery windows so the schedule holds.
Detached ADU in San Marino
Detached ADU work in San Marino most often means converting an original carriage house or detached garage, not building new from the ground up. These structures are everywhere here: three-car garages behind Spanish Colonials on Lorain Road, service buildings behind Tudor estates near Lacy Park. A detached ADU conversion in San Marino typically runs $200,000 to $450,000 depending on the structure’s condition and the level of finish your architect specifies. The number that surprises most homeowners is the MEP cost: nearly every pre-1950 outbuilding here still carries knob-and-tube or early Romex wiring, galvanized supply lines, and asbestos floor-tile mastic, all of which must come out before the first wall is insulated.
Seismic and Structural Readiness
San Marino sits on the Raymond Fault zone and these old carriage houses were never laterally braced to modern shear standards. We include seismic retrofit in every detached conversion, plus full electrical replacement and replumbing to current California Title 24. Those are not upgrades. They are the cost of doing this correctly in San Marino.
Architectural Review Board Compliance
In most cities, the building department checks code compliance. In San Marino, the Architectural Review Board checks aesthetics too: your ADU must look like it belongs to your house. Our project coordinators manage that review directly, so you’re not sending three rounds of revised elevations to a city office at 10 p.m. on a Tuesday.
Trusted Brands We Service in San Marino
We are hands-on with the prefab and materials brands San Marino homeowners actually ask about: Abodu, Cover, and Dvele, matched to your lot, budget, and timeline. For exterior detailing that satisfies the Board, we spec James Hardie siding where it fits the primary residence’s style, and we keep a working inventory of common trim profiles and flashing for local turnaround. If your architect has drawn a specific imported tile or a custom glass system, we order early, track lead times weekly, and won’t let a backordered item quietly push your move-in date by three months.
Common ADU Builders Problems We See in San Marino Homes
- Board rejection of generic plans. The Architectural Review Board sees hundreds of ADU submissions a year. A plan that looks like it was drawn for Alhambra or Temple City gets bounced within days. We submit historically sympathetic packages from the first round and save you the resubmission fee and the two-month delay.
- Asbestos discovered at plan check. Pre-1950 carriage houses in San Marino almost always contain asbestos in floor tile mastics, popcorn ceilings, and pipe insulation. The building department flags it during plan review, which can add $15,000 to $45,000 in abatement costs. We recommend a pre-permit hazmat assessment before the budget is locked.
- Knob-and-tube and galvanized plumbing surprises. You cannot insulate around knob-and-tube, and you cannot pass Title 24 with it in the walls. Full wiring replacement and repiping on a detached garage conversion typically runs $20,000 to $50,000 in San Marino, depending on the distance from the main panel and the water service.
- Custom millwork ordered without a fixed price. Some contractors order oak cabinetry and architectural glass on a cost-plus basis, which means the final invoice is a moving target. Our written price includes the specified materials, and we don’t place an order until that price is signed.
Pricing for ADU Builders in San Marino, CA
Here are real numbers for San Marino’s market. A studio ADU conversion of an existing detached garage runs $160,000 to $250,000. A 600 sq ft one-bedroom carriage house conversion with custom cabinetry and architectural glass runs $260,000 to $380,000. A new detached ADU with board-compliant historic detailing starts around $220,000 and can exceed $450,000 for a one-bedroom with high-end finishes. What changes the price? Lead times on specialty materials, hazardous materials abatement, seismic retrofit scope, and the Architectural Review Board’s detailing requirements. Call (254) 602-5618 for a free estimate with a written line-item price. No verbal ballpark. No change order at the door.
We Also Serve Cities Near San Marino
Our crews serve San Marino and the surrounding communities, including San Gabriel, Alhambra, Pasadena, and South Pasadena. If your property is near the Huntington Library corridor or along the Oak Knoll slopes, you’re in our service area. Wherever you are in this corner of the San Gabriel Valley, the same written pricing and Kingswell Guarantee applies.
Serving San Marino, CA - Our Local Coverage Area
We’re based in the San Marino area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Builders in San Marino
Because San Marino is a largely 1920s – 1950s estate city with formal revival architecture, the Board requires ADUs to match the primary residence in materials, roofline, and detailing before a permit is issued. Alhambra and Temple City operate under standard code review without that aesthetic test. In San Marino, the design package matters as much as the framing plan. Call (254) 602-5618 and we’ll walk you through what the Board typically flags on your specific lot.
All of it must come out. Knob-and-tube cannot be insulated around and will not pass Title 24, and galvanized supply lines are beyond their service life. You’ll need full electrical replacement, replumbing, seismic retrofit, and insulation that meets current California code. On a typical San Marino carriage house, that MEP package runs $40,000 to $90,000 before finishes. A free estimate from us gives you that number in writing, line by line.
Yes. Almost every pre-1950 secondary structure in San Marino contains asbestos in floor mastic, textured ceilings, or pipe insulation. The building department will flag it at plan check, and abatement costs of $15,000 to $45,000 can blow a budget that assumed a light remodel. A pre-permit hazmat assessment costs a few hundred dollars and protects your written price.
We order early, after the price is fixed in writing, and we sequence the schedule around delivery windows. Custom oak cabinetry takes 10 to 14 weeks. Imported tile and architectural glass can take 12 to 16 weeks. We don’t wait until the walls are framed to place those orders. That’s how a carriage house conversion on Lorain Road stayed on its seven-month calendar while the specialty glass was still in the supply chain.
San Marino sits on the inland San Gabriel Valley floor where summer highs regularly hit the mid-to-high 90s with little coastal breeze. We spec R-21 walls and R-38 ceilings at minimum, plus a correctly sized ductless mini-split for every garage conversion. A unit that’s undersized, or a conversion with no wall insulation, because the original garage had none, will be unusable from June through September. Call (254) 602-5618 for a free estimate on an ADU that stays cool in a San Marino August.
Written by Russ Delmar, Owner at Lodgewick ADU Builders, serving San Marino and the surrounding San Gabriel Valley since 2010.