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Sunnyvale · Custom ADU
A Sunnyvale ADU drawn for your tight lot and the family who'll live in it.
Silicon Valley lots are small and land is dear, so every square foot has to earn its place — we draw a bespoke unit around your ranch or Eichler and build it end to end.
Trusted by homeowners across Sacramento & surrounding areas.
Custom ADU in Sunnyvale — fast facts
City
Sunnyvale
ADU type
Custom ADU
Contractor license
CSLB #1119373
Free estimate
(916) 677-9774
Last updated
Why custom in Sunnyvale
When a tight lot needs its own plan
A stock detached plan wants an empty rectangle of yard and not much else. Sunnyvale rarely hands you that. Lots here are modest, land is expensive, and a mid-century ranch or an Eichler usually sits dead-center on its parcel — so the buildable area left over after setbacks is small and shaped like nothing in a catalog. Add a mature redwood the city won't let you cut, a pool, or a side yard barely wide enough to carry lumber, and an off-the-shelf footprint runs out of answers. Custom starts where a pre-drawn plan can't reach. We draw the unit to the exact buildable area you have, to the existing house, and to how the family actually wants to live — then we build it.
Drawn to the real buildable area after Sunnyvale's tight setbacks
Designed around a mature tree, a pool, or a narrow side-yard path
The answer when no catalog footprint lands on a small Valley lot
The design phase
Site walk to permit, drawn in-house
Custom is won in the drawings, so we put real hours there. It opens with a site walk and a measure-up — and on a tight Sunnyvale lot, that visit matters more than a survey ever could. A survey won't tell me where the existing trees actually pin the footprint in Birdland, how the neighbor's window lines change a setback judgment in the Heritage District, or whether we're hand-carrying material down a four-foot side yard off an Old Sunnyvale lot. That first walk 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 before the layout clicks. When it locks we draw full construction documents and file with the City of Sunnyvale. The honest part: this front end runs six to ten weeks before the counter even opens it.
Site walk and access study before a single line gets drawn
Tree, setback and side-yard constraints settled on the first visit
Full construction documents drawn in-house, then filed with the city
Matching the main house
Matching a Sunnyvale ranch or Eichler
A custom unit should look like it grew out of your house, not like it got dropped behind it. Sunnyvale makes that specific, because the housing stock is distinctive. Most of Old Sunnyvale and the Heritage District runs to single-story mid-century ranch — low rooflines, wide eaves, long horizontal lines. Then there are the Eichler tracts, which are their own world: flat or low-slope roofs, post-and-beam framing, floor-to-ceiling glass, vertical siding, an interior atrium. Drop a generic gabled cottage behind an Eichler and it fights the whole property from the street. So we pull roofline, eave depth, and siding profile off your actual house, and on an Eichler lot we match the flat-roof, post-and-beam vocabulary instead of fighting it. A copied stock elevation rarely belongs here. A drawn one does — and it appraises like it.
Low ranch rooflines and wide eaves for Old Sunnyvale and Heritage
Flat-roof, post-and-beam, vertical-siding language for Eichler tracts
Roof pitch, eave depth and siding drawn to your specific home
Multi-gen + finishes
Multi-generational layouts done right
A lot of our Sunnyvale custom work is families solving one exact problem — aging parents who want their own front door, or adult kids who looked at Silicon Valley rent 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 even on a small, pricey lot. That reshapes the plan. We draw zero-step entries, 36-inch doorways, curbless showers with grab-bar blocking set in the walls, and a second primary suite so two generations each keep their own privacy. The detached state ceiling is 1,200 sq ft, and custom clients tend to push right toward 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. Custom is where the premium package gets drawn in from day one, not bolted on later.
“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 Sunnyvale land roughly $427K to $760K-plus depending on size, finish level, and how tight the site is. High land value, strict and slower city review, high permit fees, and the seismic detailing this region requires all stack onto the number. A cramped lot also costs more to build on than an open one: material staging is harder, access is tighter, and protecting a mature tree or an Eichler's glass during the work takes care. The flip side is why owners build here anyway — Sunnyvale rents, propped up by Apple, LinkedIn, and the surrounding tech employers, run far above Sacramento. Even a $600K-plus unit pencils out in a way it never would back home.
Fair question, and I'll be straight: we're based in Sacramento, about two and a half hours from Sunnyvale. We're not the closest crew you can hire. 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 roughly two-hour drive each way — and custom usually is, because the value sits in the design and the build quality, not in being five minutes away. I'll be on your lot for the site walk and the key milestones: the foundation pour, framing, and the major inspections. If your job is a small, simple unit on a clear lot, a Sunnyvale-local crew may serve you better, and I'll say so. For a complex, finish-heavy 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 done and it drops onto an open pad. Custom starts at zero for your parcel: our designer sizes and shapes the unit around the tight setbacks, the trees, the seismic engineering, the look of your Sunnyvale home, 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 small lot where every foot counts, a mature tree or pool in the way, an Eichler you want matched, an accessible suite for a parent — that a rectangle off the shelf can't reach. If your lot were big and clear and your house ordinary, we'd happily steer you to stock and save you money. In Sunnyvale, with its small parcels and distinctive housing, that's rarer than you'd think.
Longer than stock — that's the honest answer, and Sunnyvale's permitting is slower than the Sacramento suburbs we usually work in. Design and construction documents run six to ten weeks. City of Sunnyvale review on a clean set often runs ten to sixteen weeks, sometimes longer when a heritage-tree or design question comes up. The build itself is usually seven to ten months for a custom detached unit, with a tight site or tricky access stretching it. Door to door you're looking at roughly thirteen to nineteen months. The slower city counter and the high fees are what push it past a flat-lot Sacramento job — plan for it from the start rather than getting surprised at month four.
It's usually the whole reason to go custom here, so we get ahead of it on day one. Sunnyvale lots are modest and the house tends to sit center-parcel, which leaves a small, oddly-shaped buildable area after setbacks. A stock rectangle either doesn't fit or wastes the yard. Because we're drawing from scratch, we shape the unit to the space that's actually left — borrow a few feet here, notch around a tree there, orient the windows away from the neighbor's. We also think hard about how material gets onto the lot, since a four-foot side yard changes the build plan and the price. A catalog plan has no answer for a tight Valley lot. A drawn one fits it, uses the yard well, and still leaves usable outdoor space.
Yes, and on a Sunnyvale lot that's often exactly the constraint that sends people to custom. Sunnyvale protects larger trees, so a mature redwood or oak you can't remove becomes a fixed point the design has to respect — we set the footprint and the foundation to keep clear of the protected root zone, sometimes shifting or notching the unit to do it. A pool does the same thing from the other direction, eating buildable area and dictating where the unit can land. A flat-pad stock plan ignores both and fails plan check or the field. We map the trees, the pool, and the side-yard access on the first visit, then draw the unit around them so it clears review instead of fighting it. That's the kind of one-off problem custom exists to solve.
It matters, and it should. Sunnyvale sits in an active seismic region — the Bay Area's faults run through the surrounding ground, and building here means building for real ground motion. On every custom unit we draw the shear walls, hold-downs, anchor bolting, and a foundation tied together so the structure rides a shake instead of coming apart in one. The good news is the dirt itself is friendly: Sunnyvale is flat valley soil, so we're not engineering for a slope on top of the seismic loads the way we would on a Bay Area hillside. That keeps the foundation more straightforward than a hill lot — usually a well-detailed slab on grade — while still carrying the seismic detailing the region requires. A stock plan drawn for a calm site elsewhere doesn't build this in. A custom set drawn for a Sunnyvale parcel puts it in the structural drawings from the start.
The permit goes through the City of Sunnyvale — plan check and inspections run through the city's building and planning departments. One counter, high fees, and slower, stricter review than the Sacramento suburbs. Power is PG&E. SMUD doesn't operate here, so if you've heard of it from family back our way, it doesn't apply. 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 be 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. With the city counter already slow, 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 toward 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 Sunnyvale lot has room to site a unit that size is the real question, because parcels here are modest and the main house already takes its share. Often the lot supports a true two-bedroom; sometimes the honest answer is a tight one-bedroom that fits the buildable area without crowding the yard. That's a judgment we make on the site walk, not from a plat alone. Attached ADUs follow a different size rule tied to the main house, so we'll run those numbers for your specific lot too.
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 tree-protection comments or the design-review notes come back from the city. One team owns the design and owns the result — which matters even more on a Sunnyvale custom job, where the field calls on a tight lot and the back-and-forth with a slower, stricter city counter are constant, and someone 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 read1,932 words8 sections
Custom ADU design and construction in Sunnyvale
Some Sunnyvale backyards just won't take a stock plan. A small lot where the main house already sits center-parcel, a Birdland yard with a protected tree you can't cut, an Eichler you want the new unit to match, or parents moving in who need a place drawn around them — that's when you build custom. We're a Sacramento design-build crew (CA license #1119373) that extends to Sunnyvale for owners who want our craftsmanship and value, draws a bespoke ADU for your exact 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 an open pad. Quickest, cheapest, and for a clear Sunnyvale backyard with room to spare and an ordinary main house, 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 Sunnyvale setbacks, the protected trees, 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 area that's actually left. The siting answers the tree and the side-yard access. The roofline answers your house.
