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Mountain View · Custom ADU
A Mountain View ADU drawn for your lot, your house, and the family it's for.
Tight Silicon Valley lots, an Eichler the city watches closely, and tech rents that make the math work — we draw a bespoke unit around all of it and build it.
Trusted by homeowners across Sacramento & surrounding areas.
Custom ADU in Mountain View — fast facts
City
Mountain View
ADU type
Custom ADU
Contractor license
CSLB #1119373
Free estimate
(916) 677-9774
Last updated
Why custom in Mountain View
When the lot won't take a stock plan
A stock detached plan wants a flat, empty rectangle and a wide path to the backyard. Mountain View rarely hands you both. The valley floor is flat — that part's easy — but the lots are tight, land value is some of the steepest in the country, and the buildable strip after setbacks shrinks fast. Then there's the housing stock: mid-century Eichler tracts the city watches closely, older bungalows around Old Mountain View and Castro Street, newer infill squeezed onto small parcels. A catalog footprint that ignores all that tends to get bounced before it's framed. Custom answers what a pre-drawn plan can't see. We draw the unit to the room you actually have, to the trees, to the seismic engineering near the region's faults, and to a main house worth respecting.
Drawn to fit a tight, high-value Silicon Valley lot from the first line
Sited around mature trees, a pool, or an odd corner the catalog ignores
The answer when no off-the-shelf footprint lands on the parcel
The design phase
Site walk to permit, drawn in-house
Custom is won in the drawings, so we put real hours there before anyone knows how the side-yard access or the tree roots behave on your block. It opens with a site walk and a measure-up. A survey leaves things out — it won't tell you how tight the only buildable strip really is, or that the materials path squeezes down a four-foot side yard between two houses. That first visit reshapes the plan more often than not. Then concept sketches. You react, we revise. Most clients run two or three rounds; a few push past five. When the layout locks we draw full construction documents and file with the City of Mountain View. Honest part: this front end runs six to ten weeks before the counter ever sees it.
Site walk and access study before a single line gets drawn
Trees, slabs and side-yard width mapped on the first visit
Full construction documents drawn in-house, then filed with the city
Matching the main house
Matching an Eichler or a bungalow
A custom unit should look like it grew out of your house, not like it got parked behind it. Mountain View makes that real work, because the stock here has strong opinions of its own. The Eichler tracts — out toward the post-and-beam flat-roof neighborhoods — are design-sensitive in a way no stucco box can fake: low flat or low-slope roofs, exposed beams, floor-to-ceiling glass, clean horizontal lines. Old Mountain View and the streets around Castro run to older bungalows with their own roof pitch and trim. We pull the rooflines off your actual house, match the eave or the parapet, copy the window proportions, and source siding that reads the same from the street. A copied stock elevation rarely belongs behind an Eichler. A drawn one does.
Flat-roof, post-and-beam vocabulary for the Eichler tracts
Bungalow roof pitch and trim for Old Mountain View and Castro
Window proportions and siding drawn to your specific home
Multi-gen + finishes
Multi-generational layouts done right
A good share of our Mountain View custom work is families solving one exact problem — aging parents who want their own front door, or adult kids who looked at Silicon Valley rents and decided the backyard beats a lease. The rent math out here is a different planet from Sacramento, which is exactly why these units pencil. That reshapes the plan. We draw zero-step entries, 36-inch doorways, curbless showers with grab-bar blocking in the walls, and a second primary suite so two generations each keep their privacy. The detached ceiling is 1,200 sq ft, and custom clients push right up against it — at that size you fit two real bedrooms, a full kitchen, and a proper living room. Then finish level: quartz, real oak floors, a tiled shower instead of a fiberglass insert.
“Every ADU we build is designed to add long-term value and open new possibilities for your property. Let's build something great together.”
— Tim, ADU Specialist
Custom Designs
Built to fit your property & needs
Turnkey Process
We handle permits, plans & everything
Built to Last
Quality craftsmanship that stands the test
Financing Made Simple
$0 Down Options. Build Now, Pay Over Time.
You shouldn't have to drain your savings to build wealth. We partner with trusted ADU lenders to find financing that fits — many homeowners build with little to nothing out of pocket.
Home Equity (HELOC)
Tap your existing equity at competitive rates — the most popular way to fund an ADU.
Renovation Loans
Finance the build against your home's projected after-completion value.
ADU-Specific Financing
Specialized lenders who underwrite based on the rental income your ADU will produce.
Cash-Out Refinance
Roll the project into a new mortgage and keep one simple monthly payment.
Estimate Your Monthly Payment
See what financing your ADU could look like — and how rental income can help cover it.
$180,000Loan amount
Credit Score
Very good · 700–739
Estimated Monthly Payment
$1,320/mo
At 7.99% APR over 30 years (illustrative)
Often offset by $2,000–$3,500/mo in rental income
No prepayment penalties with most partners
Pre-qualification with no impact to your credit
Illustrative only — not a loan offer. Actual rates and terms are set by third-party lenders based on your qualifications.
Service areas
Where we build
Headquartered in the Greater Sacramento Area and serving homeowners from the Sierra foothills down through the Bay Area. Don't see your city? We probably still get there — just ask.
The most common things Sacramento homeowners ask before starting an ADU project.
Custom is the priciest path, and Silicon Valley pushes it higher than almost anywhere we work — I won't soft-pedal it. For 2025-2026 we're seeing finished custom detached units in Mountain View land roughly $427K to $755K-plus depending on size, finish package, and how rough the site fights back. The drivers are local: brutal land value, the City of Mountain View's high permit fees, seismic engineering near the region's active faults, and the tight side-yard access that turns a routine concrete pour into a pump-over-the-house job. The flip side is why owners build here anyway. Mountain View rents, fed by an endless stream of tech workers — Google's right here — run far above Sacramento. Even a $600K-plus unit pencils out in a way it never would back home, which is the whole reason the math still works in this town.
Fair question, and I'll be straight with you: we're based in Sacramento, roughly two and a half hours from Mountain View. We're not the closest crew you can hire, and I'm not going to pretend otherwise. We extend down here for homeowners who want our craftsmanship and our pricing over a Bay Area outfit's quote, or for a larger custom project that's worth the drive — and custom usually is, because the value sits in the design and the build quality, not in being ten minutes away. I'm on your lot for the site walk, the foundation pour, the framing, and the key inspections. If your job is a small, simple unit and you want a crew five minutes out, a Peninsula-local builder may serve you better, and I'll tell you so. For a complex custom build, the right team beats the close one.
A stock plan is pre-drawn and repeated — faster and cheaper, because the design work is already done and it drops onto a flat pad. Custom starts at zero for your parcel: our designer sizes and shapes the unit around the tight buildable strip, the trees or the pool in the way, the seismic engineering, the look of your Eichler or bungalow, and exactly how the family plans to live in it. Custom costs more and takes longer up front. The reason to choose it is a one-off problem — a mature oak you won't cut, a design-sensitive main house, an accessible suite for a parent, a lot where the catalog rectangle simply won't fit — that an off-the-shelf plan can't reach. If your lot were wide open and your house ordinary, we'd happily steer you to stock and save you money. In Mountain View, with these lot sizes, that's rarer than you'd think.
Longer than stock — that's the honest answer, and Mountain View's permitting is slower than the Sacramento suburbs we usually work in. Design and construction documents run six to ten weeks. City of Mountain View review on a clean set often runs ten to sixteen weeks, longer if a tree-protection or planning question gets pulled in. The build itself is usually seven to ten months for a custom detached unit. Door to door you're looking at roughly thirteen to nineteen months. The slower city counter and the high fees are what stretch it past a flat-lot Sacramento job, not the ground — the valley floor here is flat and cooperative. Plan for the timeline from the start rather than getting surprised at month four.
It genuinely is, more than most. Home to Google and right in the middle of the housing crunch, Mountain View has pushed hard on housing for years and the policy reflects it — the city wants these units built. That's the good news. The honest caveat is that ADU-friendly policy and an easy build are two different things. Land is costly, lots are tight, fees are high, and the counter is slower and stricter than a suburban Sacramento city. So you get a city that's on your side in principle and a process that still demands a complete, code-compliant set to move quickly. On a custom job that works in your favor: because we're drawing from scratch, we can meet the objective standards cleanly and design the unit to fit the lot and the neighborhood instead of fighting the review.
That's exactly where custom earns its keep. A stock rectangle assumes an empty pad and has nothing to offer a backyard with a 60-year-old oak, an existing pool, or an odd corner the setbacks carve up. We map every one of those on the first site walk — the canopy, the root zone, the pool equipment runs, the slab edges — and draw the unit to work with them. Sometimes that means an L-shaped footprint that bends around a trunk. Sometimes it means siting the unit on the one buildable strip that keeps a protected tree untouched, since Mountain View takes tree protection seriously. A catalog plan can't bend; a drawn one bends to whatever your lot already has. On a tight, mature Mountain View parcel, that flexibility is usually the whole reason to go custom.
Yes, and it should be built into the structure, not treated as an afterthought. Mountain View sits in a seismically active region near the area's faults, and every custom unit we draw here gets engineered for it — shear walls in the right places, hold-down hardware, anchor bolting, and a foundation tied together so the structure rides a shake instead of coming apart. A custom job pours a brand-new foundation, which is both the responsibility and the opportunity: we design it and the framing above to real ground-motion requirements from the first structural sheet. A stock plan drawn for a calm site elsewhere doesn't carry this detailing. The foundation and the seismic system are part of where Bay Area structural money goes, and it's the last part of a build you'd want a contractor guessing at.
The permit goes through the City of Mountain View — plan check and inspections run through the city's building and planning departments. One counter, strict review, high fees, but a city that wants ADUs built. Power is PG&E, not SMUD — if you've heard of SMUD from family up our way, it doesn't operate down here. A custom unit's electrical service, any main-panel upgrade, the load calc, and the meter set all coordinate through PG&E, which in the Bay Area can run slow. An all-electric unit with a heat pump, an induction range, and maybe an EV charger pulls real load, so we size the service and line up PG&E early in design rather than at the end, where it stalls a final inspection. Getting the utility piece moving early is half of keeping a custom build on schedule.
State law caps a detached ADU at 1,200 sq ft, and most of our custom clients build right up near that ceiling — at 1,100 to 1,200 sq ft you fit two genuine bedrooms, a full kitchen, and a real living room, which is usually the whole point of going custom. Whether your Mountain View lot has room to site a unit that size depends on the parcel. The valley floor is flat, which helps, but the lots are tight and land value is high, so the buildable area after setbacks can bite harder than the flat ground suggests. Smaller is allowed; we just rarely see custom clients want it. Attached ADUs follow a different size rule tied to the main house, so if you're attaching to an Eichler or a bungalow we'll run those numbers for your specific lot.
In-house. Our designer does concept, floor plans, elevations, and the full construction document set, and that same drawing carries straight into the build with no handoff gap. You're not coordinating a separate architect, a separate engineer, and a separate builder who all point fingers when the access path tightens or the city's comments come back. One team owns the design and owns the result — which matters even more on a Mountain View custom job, where the field decisions on a tight-access build and the back-and-forth with a strict city counter are constant, and somebody needs to own them end to end.
Other services
Not quite the right fit?
Every Sacramento ADU project is different. Here are the other paths we build under one roof — and we're happy to talk through which one fits your lot best.
We treat every home like it's our own — quality work, clear communication, and happy homeowners.
PaulOwner · Future Generation
9 min read2,005 words8 sections
Custom ADU design and construction in Mountain View
Some Mountain View backyards just won't take a stock plan. A tight Silicon Valley lot where the buildable strip is barely wide enough, a mature oak you won't cut, an Eichler the city watches closely, or parents moving in who need a unit drawn around them — that's when you build custom. We're a Sacramento design-build crew (CA license #1119373) that extends down to the Peninsula for owners who want our craftsmanship and value, draws a bespoke ADU for your exact Mountain View lot, and builds it design through final inspection, one team the whole way. Call (916) 677-9774.
01Section
What actually makes an ADU custom
People throw "custom" around loosely, so let me draw the line. A stock or model ADU is a plan we've already drawn and built before — pick a size, maybe swap a finish, and it drops onto a flat pad. Quickest, cheapest, and for a clean Mountain View backyard with an ordinary main house and room to spare, often the right one. We build those gladly. But it isn't custom.
Custom means the design starts at zero, on your parcel. Our designer takes the survey, the City of Mountain View setbacks, the grade, the tree-protection lines, the seismic requirements, and how your family plans to live. Then a unit gets drawn that didn't exist until your lot called for it. The footprint bends to the buildable strip, the plan bends around a tree or a pool, the roofline answers your house. Nobody else has this drawing.
