A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in San Lorenzo, CA
Lodgewick ADU Builders handles accessory dwelling units, garage conversions, and home additions across San Lorenzo, CA, a town where most homes are single-story ranch houses built between the 1940s and 1960s on compact, flat lots. The big variable here is the original concrete slab: many San Lorenzo homes have post-tensioned cables running through the foundation, which makes cutting into it for new plumbing a job that requires X-ray scanning before any saw touches the floor. Russ Delmar leads our San Lorenzo team, and every project starts with a written price. Call (707) 760-0502 to talk through your lot.
Why San Lorenzo Homes Are Different
San Lorenzo’s housing stock is a specific kind of challenge. These are mid-century tract homes, mostly one story, with attached garages and small backyards. That means an ADU here is rarely a simple shed-to-studio conversion. Most jobs become a question of vertical space: a second-story addition over the garage, or a garage conversion that preserves the existing roofline while turning 400 square feet into a livable unit.
The climate helps in one way and hurts in another. San Lorenzo gets cool, wet winters and dry summers, so you don’t need heavy insulation or an oversized HVAC system – standard Title 24 energy compliance covers it. But drainage is the thing people forget. Flat lots with clay-heavy soil mean a poorly graded ADU pad will collect water against the foundation every winter. We plan grading and downspout routing before anyone digs.
The foundation is the other piece. Those original concrete slabs from the 1950s often have post-tensioned cables. Cutting a trench for a new bathroom line without scanning first can snap a cable and compromise the slab. In San Lorenzo, we scan before we cut, every time. It’s not optional.
Our Main San Lorenzo Services
The three services San Lorenzo homeowners call about most are home additions, garage conversions, and ADU construction. Each has its own San Lorenzo page with pricing and scope details.
Home Addition Contractor in San Lorenzo
A home addition in San Lorenzo usually means going up, not out. The lots are too small to spread, so most additions we quote are second-story builds over the existing footprint or bump-outs that push into a side yard by just a few feet. The work hinges on what’s underneath: foundation capacity, truss conditions, and whether the original framing can carry a second floor. We evaluate all of it and put the assessment in writing with the price. Home Addition Contractor in San Lorenzo covers what a typical addition costs and how long it takes.
Garage Conversion Contractor in San Lorenzo
Garage conversions in San Lorenzo are common because the attached garage is already there, already permitted as structure, and often sits on the same slab as the house. The catch is the slab: post-tensioned cables mean new plumbing trenches have to be scanned and mapped first. There’s also the parking requirement – San Lorenzo enforces replacement parking for converted garages in many cases, which usually means a new driveway apron or carport addition. Garage Conversion Contractor in San Lorenzo covers the specifics and the price ranges.
ADU Builders in San Lorenzo
An ADU in San Lorenzo – a small house on the same lot as a bigger one – most often takes the form of a detached backyard unit or an over-garage conversion. The planning question is always the same: how do you fit a 400 to 800 square foot unit on a lot that already holds a 1,100 square foot house, a driveway, and a yard? Setbacks and parking drive the answer. We work through those constraints with prefab manufacturers like Abodu and Cover when the lot suits them, and stick-build when it doesn’t. ADU Builders in San Lorenzo has the full breakdown.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in San Lorenzo
We install and finish units from our brands including Tuff Shed, Abodu, Cover, and James Hardie products. We know which prefab units clear San Lorenzo’s setback rules, which siding holds up to the wet winters, and what’s actually in stock locally. That means fewer surprises during the build.
Pricing for ADU Company in San Lorenzo, CA
| Service | Typical range in San Lorenzo |
|---|---|
| Garage conversion (attached, single-car) | $80,000 – $120,000 |
| Garage conversion (attached, two-car) | $110,000 – $160,000 |
| Detached ADU (studio, 400 – 500 sq ft) | $150,000 – $220,000 |
| Detached ADU (1-bedroom, 500 – 700 sq ft) | $200,000 – $300,000 |
| Detached ADU (2-bedroom, 700 – 1,000 sq ft) | $280,000 – $400,000 |
| Prefab ADU (Abodu or Cover, studio) | $140,000 – $210,000 |
| Prefab ADU (Abodu or Cover, 1-bedroom) | $190,000 – $270,000 |
| Over-garage ADU (above existing garage) | $220,000 – $340,000 |
| Home addition (ground-floor bump-out, 200 – 400 sq ft) | $90,000 – $150,000 |
| Home addition (second-story, 400 – 600 sq ft) | $180,000 – $300,000 |
| Foundation scan and plumbing trench (garage conversion) | $1,500 – $3,500 |
| Title 24 energy compliance and documentation | $800 – $1,500 |
Two things push prices up in San Lorenzo more than anything else. First is the foundation: if the slab scan reveals cables in the way of your planned bathroom line, the plumbing route changes and the cost moves with it. Second is parking replacement, which runs higher when a garage conversion eats the only off-street space. Every quote we give is written before work starts, and it stays the same unless you change the scope.
Neighborhoods We Serve in San Lorenzo
We work across San Lorenzo, from the streets north of Hesperian Boulevard down to the neighborhoods near the San Lorenzo Creek corridor. Most of our jobs are in the classic mid-century pockets, but we also quote properties in the newer infill areas along the edges of town. Our crews typically schedule estimates within a few business days anywhere in San Lorenzo, with the earliest slots going to morning callers.
- San Lorenzo Village
- Del Rey neighborhood
- Washington Manor
- Palomares Hills area
- Bockman Road corridor
Service Area – Cities Near San Lorenzo
Our San Lorenzo team also serves nearby communities across the East Bay. If you’re just over the line in San Leandro, CA, down toward Hayward, CA, up in Oakland, CA, or over toward Moraga, CA, we can quote the same work with the same written-price promise. Dispatch and scheduling are coordinated from our San Francisco Bay Area office; crews serve San Lorenzo locally.
Serving San Lorenzo, CA - Our Local Coverage Area
We’re based in the San Lorenzo 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 Company in San Lorenzo
We schedule estimates in San Lorenzo within a few business days of your call. Morning callers usually get the earliest slots. Call (707) 760-0502 and we’ll get you on the calendar. The estimate itself is free and comes with a written price.
Yes. San Lorenzo falls under Alameda County building regulations, and ADUs, garage conversions, and home additions all require permits. We handle the permit process on every project, including the foundation scans and Title 24 documentation. Call (707) 760-0502 and we’ll explain what your specific lot needs.
No. The price we give you in writing before work begins is the price you pay, unless you change the scope. That’s the whole point of The Kingswell Guarantee. If something unexpected shows up, we flag it, price it in writing, and you decide. Call (707) 760-0502 to schedule your free estimate and see the numbers for yourself.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What San Lorenzo Customers Say
"The ADU came out beautiful and the permitting, which terrified me, was handled start to finish. They kept me updated every week so I was never wondering what was happening."
- Shauna Mills"Turned our detached garage into a little guest house. Clean crew, respectful of the neighbors, and no mystery charges at the end. Love how it turned out."
- Carmela Fontes"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt
