A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in San Leandro, CA
We’re Lodgewick ADU Builders, the ADU company of the Kingswell family, and we build accessory dwelling units, garage conversions, and home additions across San Leandro. Most of the homes here were built between the 1940s and 1970s, on flat lots with room to work, but the native clay soil and aging sewer laterals mean every project starts with a close look at drainage and underground lines before we pour a single footing. If you’re weighing an ADU in San Leandro, call us at (707) 760-0502 to talk through your lot and get a written price before any work begins.
Why San Leandro Homes Are Different
San Leandro’s housing stock runs heavily to single-story ranch and split-level homes from the 1940s through the 1970s. That’s good news for ADU work: the lots are wider than what you’ll find in Oakland or Berkeley, and many backyards can take a detached unit without eating the whole yard. The attached garages on these older homes are also prime candidates for garage conversion, since they’re already framed and wired, even if the original electrical panel needs an upgrade to carry the new load.
But San Leandro soil is its own animal. The native clay expands when it’s wet and contracts when it’s dry, which means foundations need proper drainage design and, on some lots, deeper footings than a standard plan would call for. Cool, fog-influenced summers and rainy winters make moisture management a deciding factor in how a detached ADU performs over time. We also see a lot of homes east of East 14th Street where the sewer lateral is original to the home and roots from mature street trees have worked their way in. When a lateral fails, the City requires replacement before a new build can tie in, and that’s a cost homeowners should know about before they start budgeting.
We plan for these conditions from day one. A lodge, after all, is a small house on a larger property, and that’s exactly what an ADU is. The Kingswell Way is simple: say the price before the work, show up when we said we would, leave the place cleaner than we found it, put the guarantee in writing, and come back if it fails.
Our Main San Leandro Services
These are the three projects San Leandro homeowners ask us about most, each with its own detailed page for local pricing and scope.
Home Addition Contractor in San Leandro
A home addition in San Leandro usually means extending a ranch home’s footprint into a big backyard while keeping the original roofline or matching it closely. We tie new foundations into the existing slab, add the electrical and plumbing runs the old home never had, and handle the permit package with the City. On many lots the biggest variable is the sewer lateral we mentioned above: if it’s compromised, replacement happens before framing starts. See typical pricing and what’s involved at Home Addition Contractor in San Leandro.
Garage Conversion Contractor in San Leandro
San Leandro has thousands of attached garages built into the original home footprint, and converting one into living space is often the most affordable way to add a bedroom, office, or small rental unit without touching the yard. The work involves insulation, drywall, new flooring, windows or doors in place of the old garage door, and usually an electrical panel upgrade. Clay soil matters here too, since any new concrete work for the old garage opening has to account for movement. Details and San Leandro pricing live at Garage Conversion Contractor in San Leandro.
ADU Builders in San Leandro
A detached ADU on a San Leandro lot opens up rental income, space for aging parents, or a quiet home office away from the main house. We handle the full build from site prep through finish work, and we match each lot to the right approach, whether that’s a panelized unit from Abodu or Cover, a Tuff Shed shell finished out, or a stick-built unit designed from scratch. The clay soil and drainage work are the parts that change the price on San Leandro lots, and we’ll put that in writing before the first truck rolls. See ADU Builders in San Leandro for full scope and pricing.
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 Leandro
We work regularly with Abodu, Cover, Tuff Shed, and James Hardie materials on San Leandro projects, and we keep our crews trained on each manufacturer’s current installation specs. Whether a homeowner wants a panelized unit delivered or a stick-built ADU with Hardie siding, we match the brand to the lot, budget, and timeline. See the full range at our brands.
Pricing for ADU Company in San Leandro, CA
| Service | Typical range in San Leandro |
|---|---|
| Detached ADU (full build, 400 – 800 sq ft) | $180,000 – $420,000 |
| Prefab ADU (Abodu, Cover, or similar) | $190,000 – $340,000 |
| Garage conversion (attached, finished interior) | $90,000 – $170,000 |
| Garage conversion with new electrical panel | $95,000 – $180,000 |
| Home addition (ground-up, 400 – 600 sq ft) | $150,000 – $300,000 |
| Bathroom addition within existing footprint | $45,000 – $85,000 |
| Primary suite addition | $120,000 – $220,000 |
| Sewer lateral replacement (triggered by ADU tie-in) | $4,500 – $15,000 |
| Foundation work for clay soil (deeper footings, drainage) | $8,000 – $25,000 |
| Electrical panel upgrade (100A to 200A) | $3,500 – $7,000 |
The two things that push San Leandro prices toward the top of these ranges are sewer lateral work and clay soil foundation upgrades, both common east of East 14th Street and in older neighborhoods with mature trees. Whatever the final number, you’ll see it in writing before we start, as part of The Kingswell Guarantee. No price changes at the door.
Neighborhoods We Serve in San Leandro
We work throughout San Leandro, and we know how the neighborhoods differ in lot size, house age, and code realities.
- Washington Manor
- Broadmoor
- Davis Tract
- Old San Leandro
- Mulford Gardens
For most parts of the city, we can put a team on your street within a day or two of the written estimate and schedule the work around your timeline. Call us for a specific arrival window for your neighborhood.
Service Area – Cities Near San Leandro
Our San Leandro teams also serve the surrounding Bay Area communities. If you’re just across the city line in San Lorenzo, CA, up in Oakland, CA, over in Moraga, CA, or near Emeryville, CA, we can help with ADUs, garage conversions, and home additions there too. Dispatch and scheduling are coordinated from our San Francisco Bay Area office, and crews serve San Leandro locally.
Serving San Leandro, CA - Our Local Coverage Area
We’re based in the San Leandro 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 Leandro
The flat, wide lots from the 1940s – 70s building boom make detached ADUs more feasible here than in denser cities, but clay soil drainage and aging sewer laterals often add scope before construction starts. We inspect the lateral and test soil conditions before writing your price, so the number you see first is the number you pay.
Yes. San Leandro requires permits for ADUs, garage conversions, and home additions, and projects that trigger sewer lateral replacement must pass inspection before tying into the city line. The Kingswell Guarantee covers permits and inspection pass-through on our projects, and we’ll walk you through it if a lateral replacement is required first.
Call us at (707) 760-0502 and tell us your address and what you’re considering. We’ll ask a few questions about your lot, schedule a site visit, and put a written price in front of you before any work begins. Estimates are free, and there’s no obligation.
Ready to talk through your San Leandro ADU, garage conversion, or home addition? Call (707) 760-0502 to schedule your free estimate. A live person answers, 24/7.
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 Leandro 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
