A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Corte Madera, CA
Corte Madera homeowners add space differently than their neighbors in San Rafael or Sausalito, and it comes down to one thing: the land. Our work as an ADU company in Corte Madera means working with flat creek-side lots, 1950s ranches, and strict riparian rules that don’t exist in most Marin County towns. Whether we’re planning an accessory dwelling unit above a garage or a full ground-up build, the conversation always includes drainage, setbacks from Chapman Creek, and how to keep the backyard usable. Call (707) 760-0502 for a free estimate and a written price before anything starts.
Why Corte Madera Homes Are Different
Most Corte Madera homes were built between the 1950s and 1970s: single-story, ranch-style, often sitting on generous lots with mature oaks and redwoods that people don’t want to lose. That means ADU placement has to be deliberate. We’re frequently working around existing trees, trying to tuck a unit where it won’t flatten the yard’s best light. The older housing stock also means electrical panels usually need an upgrade to support a second living space, and original foundations sometimes need attention before an attached ADU can go in.
The Bay’s proximity keeps temperatures mild, but it also keeps things damp. We see more moisture-related issues in Corte Madera than in the hotter, drier parts of Marin, so waterproofing details, proper ventilation, and crawlspace design matter here more than a quick look at a floor plan would suggest. And in the Chapman Creek area, creek setback requirements shape what can be built and where. Additions and detached units have to avoid riparian zones, which sometimes means repositioning a proposed ADU by ten or fifteen feet. It’s a constraint, but it’s one we plan for from the first site visit.
Our Main Corte Madera Services
Corte Madera homeowners usually reach out to us about three things: expanding the main house, converting an underused garage, or building a new ADU. Each has its own Corte Madera page below.
Home Addition Contractor in Corte Madera
Adding square footage to a 1960s ranch in Corte Madera means matching rooflines, upgrading the panel, and sizing the addition so it doesn’t crowd the backyard. Creek setbacks and drainage planning often drive early design decisions, especially on lots near Chapman Creek. Our Home Addition Contractor in Corte Madera page covers what to expect during a main-home expansion, from foundation to finish.
Garage Conversion Contractor in Corte Madera
A garage conversion is often the fastest way to add a rental unit or in-law suite in Corte Madera, because much of the shell is already there. That said, older garages here weren’t built with living-space ventilation or insulation in mind, so moisture control and ceiling height adjustments are typical parts of the job. Our Garage Conversion Contractor in Corte Madera page walks through the process in detail.
ADU Builders in Corte Madera
The term ADU just means accessory dwelling unit: a second, smaller home on the same lot as the main house. In Corte Madera we see a lot of interest in detached units in side or back yards, since the flat lots can accommodate them. Prefab options from companies like Abodu and Cover often shorten timelines here, and we match the system to the lot. Our ADU Builders in Corte Madera page goes deeper into design, prefab versus site-built, and timeline.
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 Corte Madera
We work with established ADU and materials brands including Abodu, Cover, and Tuff Shed, and we use James Hardie siding where the design calls for it. Parts and panels are sourced through our local Bay Area suppliers, which keeps lead times in Corte Madera shorter than ordering from out of state. See our brands for the full list.
Pricing for ADU Company in Corte Madera, CA
| Service | Typical range in Corte Madera |
|---|---|
| Garage conversion (finish to living space) | $95,000 – $145,000 |
| Detached ADU (prefab, turnkey) | $180,000 – $260,000 |
| Detached ADU (site-built) | $220,000 – $340,000 |
| Attached ADU / home addition | $150,000 – $250,000 |
| JADU (junior ADU, 500 sq ft or less) | $85,000 – $130,000 |
| Second-story addition | $250,000 – $400,000 |
| Primary suite addition | $120,000 – $200,000 |
| Kitchen extension | $90,000 – $150,000 |
What pushes a Corte Madera job toward the top of these ranges is usually site work: drainage improvements near the creek, foundation upgrades on older ranches, or panel replacement. We give every homeowner a written price before any work starts, and that number doesn’t change at the door.
Neighborhoods We Serve in Corte Madera
We work throughout Corte Madera, from the flats north of Madera Boulevard to the Chapman Creek corridor and the hillside lots near Christmas Tree Hill Road. Most areas are within a short drive of our schedulers, and we’ll plan the job around your specific lot’s setbacks and drainage.
- Chapman Creek area
- Madera Gardens
- Christmas Tree Hill
- Corte Madera flats (east of Highway 101)
- Mariner Green
Service Area – Cities Near Corte Madera
Our Corte Madera crews also handle ADU and addition work in nearby Marin and East Bay communities. If you’re just over a border, we can help there too: San Rafael, CA, Sausalito, CA, Richmond, CA, and San Francisco, CA. Each has its own set of lot conditions and permit realities, and we plan accordingly.
Serving Corte Madera, CA - Our Local Coverage Area
We’re based in the Corte Madera 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 Corte Madera
Permitting drives the schedule more than labor availability. Marin County and town review times vary by project scope, but once permits are in hand we move quickly on construction. Call (707) 760-0502 and we’ll walk you through a realistic timeline for your specific lot.
Yes. We prepare and submit plans, handle corrections, and coordinate inspections. Creek setback and flood zone requirements in parts of Corte Madera add steps, and we manage those from the start so nothing stalls mid-project.
Most Corte Madera lots can accommodate a detached unit without losing the whole yard, but it depends on setbacks and existing trees. We site the unit to preserve as much usable outdoor space as possible, which is one reason we walk the property before quoting. Call (707) 760-0502 for a free estimate and a written price.
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 Corte Madera 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
