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Daly City · Detached ADU
A freestanding backyard unit, built for a Daly City hillside.
Own foundation, own roof, fully separate from the main house — a true detached ADU sited on a Westlake hillside lot and engineered for the fault that runs right past the west edge of town.
Trusted by homeowners across Sacramento & surrounding areas.
Detached ADU in Daly City — fast facts
City
Daly City
ADU type
Detached ADU
Contractor license
CSLB #1119373
Free estimate
(916) 677-9774
Last updated
Stands on its own
A detached unit is a whole building
The thing that makes a detached ADU worth the money is also the thing that makes it the hardest type to pull off — it shares nothing with your house. Own slab. Own walls. Own roof. We've set freestanding units behind Westlake tract homes where the only buildable ground was a stepped patch down the hill, and because the unit stood fully clear we turned the windows away from the fog line and kept it independent of the original house. That separation is the whole reason owners here go detached. The cost of it is a second foundation, a second roof, and a materials path squeezed from a narrow street down to a sloped backyard. We map every piece of that first.
Independent foundation, framing, roof and full exterior envelope
Sited and oriented for light, the yard and the slope you actually have
The most flexible ADU type — but a ground-up build, not a conversion
City of Daly City permitting
Daly City runs your permit
Daly City is its own incorporated city, so your detached ADU permit, plan check, and inspections all run through the City of Daly City — not San Mateo County. One counter, one set of standards. Here's the honest part. Bay Area permitting is slower and pricier than what we see inland, and Daly City adds two wrinkles most owners don't expect: fault-zone setbacks and slope review. Fees run high, and a thin plan set bounces for corrections and waits in line again. We pull your zoning, your setbacks, the Alquist-Priolo fault-zone line, and the seismic requirements on the first lot visit, because all of it shapes the drawings before a single line goes down. A complete package walking in is the cheapest thing you can hand the city.
Reviewed and inspected by the City of Daly City — high fees, slower review
Zoning, setbacks, fault-zone line and slope checked on the first visit
Complete plan set drawn in-house, fewer correction rounds at the counter
The ground here
The San Andreas runs past town
Daly City sits on top of one of the most active faults in the state. The San Andreas runs right along the west edge of town — Lake Merced and the valley it sits in trace the fault line — and that geology drives the structure of every detached job we do here. A detached ADU pours a brand-new foundation, so we don't drop a generic slab and hope. We engineer it for real ground shaking: shear walls, hold-down hardware, an anchored foundation sized to the soils on your lot, and the Alquist-Priolo setbacks where the fault zone touches your parcel. Terrain matters too. Much of Daly City marches up hillsides — Westlake, St. Francis Heights — so a sloped lot means a stepped or downhill foundation instead of a clean flat pour.
Foundation engineered for San Andreas ground motion — shear walls, hold-downs
Alquist-Priolo fault-zone setbacks treated as a real design input
Hillside lots get stepped or downhill footings, not a one-size slab
Tight lots, fog and utilities
Squeezing a build to the backyard
Daly City lots are tight and repetitive — the famous "little boxes" of Westlake sit on small, uniform parcels marching up the hill — so the buildable patch in a backyard is small once setbacks take their cut. Siting a standalone unit here is a fitting exercise on a slope. Then there's the fog. Coastal moisture is constant, which means we detail flashing and ventilation harder than an inland job ever needs, so the building stays dry and breathes. Getting materials to the back is its own problem: a side yard a few feet wide, too narrow for a truck, so we hand-carry, stage in the street under a permit, or pump concrete over the house. Power is PG&E, and a true detached unit gets its own trenched runs for power, water and sewer.
Tight, repetitive Westlake lots — every buildable foot counts on a slope
Coastal fog drives careful flashing and ventilation detailing
Separate PG&E power, water and sewer on a planned trench route
Build Smart. Invest Wise.
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Trusted by homeowners across Sacramento & surrounding areas.
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“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.
Straight answer: we're a Sacramento design-build contractor, and Daly City is about two hours west of our home base. We're not local and I won't pretend we are. We extend out to the coast for two kinds of owners — ones who want our craftsmanship and our pricing over a Bay Area quote, and larger detached projects worth the drive. On a build that commonly runs $400K to $750K-plus out here, our rates often beat local bids even after the travel. For a small, simple unit on an easy lot, a Daly City-local builder may pencil out better, and I'll tell you that honestly rather than chase a job that doesn't fit. The drive is the trade; the value is what makes it worth it.
With the City of Daly City. Daly City is its own incorporated city, so your detached ADU permit, plan check, and inspections all run through the city's building and planning departments — not San Mateo County, even though the county wraps around it. One counter. The catch is that Bay Area permitting is slower and the fees are higher than an inland owner expects, and Daly City layers on fault-zone and slope review. We confirm your zoning, your setbacks, the Alquist-Priolo line, and the seismic requirements on the first visit so the package is built for the Daly City counter from the start, instead of getting patched after a correction round you didn't budget for. A complete set is the cheapest thing you can hand the city.
It shapes the foundation, which is most of the structural cost on a detached unit — and in Daly City it can shape where the unit is even allowed to sit. The San Andreas runs right along the west edge of town; the lake out there sits in the fault valley. So we do two things. First, we check whether your parcel falls in an Alquist-Priolo fault zone, because that drives mandatory setbacks from the trace. Second, we engineer the new foundation and the framing for real ground motion — an anchored foundation, shear walls, hold-down hardware tying the structure down so it doesn't walk in a quake. A detached ADU pours a brand-new foundation, which is the upside: a properly engineered new building rides out shaking far better than old converted bones.
Yes — PG&E. Power, the service drop, any panel upgrade, and the new meter for your detached unit all run through PG&E's application process, with its own forms and its own timeline, which in the Bay Area runs slow. A true detached ADU needs its own utility runs, meaning a trench from the main service back to the unit for power, water, and sewer. On a tight, sloped Daly City lot we route that trench around whatever's already in the ground and around the narrow access you've got. We engage PG&E early, while foundation work is underway, because the meter set is one of the things most likely to hold up your final sign-off if you leave it to the end.
Often, yes, but it takes measuring before it takes promising. Westlake lots are tight, uniform, and many of them step up a hillside, so the buildable area in a backyard is genuinely small once setbacks take their cut. Siting a standalone unit here is a fitting exercise on grade — we measure the real buildable envelope, account for setbacks, easements and any fault-zone line, and figure out where a freestanding building actually lands. Detached helps in one specific way: because it shares no wall with the house, we can place and orient it wherever the slope and the lot allow. If the math says the buildable area is too small, we'll tell you that on the first visit rather than draw a plan that can't be built.
It does, and the numbers are exactly why owners here build despite the cost. Bay Area ADU economics are a different planet from Sacramento. A detached unit in Daly City commonly runs $400K to $750K-plus — well above what the same unit costs inland. But coastal rents this close to San Francisco are far higher too, and demand is steady. High land value plus high rents is what makes the math pencil out even at those build costs. I won't write a rent number into your proposal — that's between you and the market — but the durable demand and the rents are why so many Daly City owners go detached instead of skipping the project. The land's already valuable; the unit makes it earn.
Daly City has the kind of steady rental demand that makes a detached unit pay. It sits right on San Francisco's southern edge, so there's constant demand from people who want a foot in the city's housing market without the city's prices, plus an easy commute reach up the Peninsula. A detached ADU with its own entrance and real separation from the main house is exactly what that market wants, and it commands a premium over a converted room. Neighborhoods like Westlake, Serramonte, and Crocker see this demand directly. I don't quote rents, but the demand is why so many owners here go detached over a conversion — a freestanding unit reads as a genuine separate dwelling, and tenants pay for that.
Because you're pouring a brand-new engineered foundation and framing a brand-new roof, plus every exterior wall, the siding, and the weatherproofing of a standalone building. A garage or structure conversion reuses a slab and a roof that already exist. In Daly City the foundation gap is wider than usual, because the new foundation has to be engineered for seismic loads near the San Andreas — and on a hillside lot, stepped or built downhill into grade. That's real money a conversion skips. What detached buys you is a freestanding unit you can place and orient where the slope allows, built to current seismic code from the dirt up. If the lowest possible price is the only goal, a conversion usually wins, and I'll say so plainly.
It does, more than people expect. Daly City is famous for its fog, and that coastal moisture is on the building most of the year. So we detail the envelope for it. Flashing at every penetration and transition gets done properly, not just stuffed and caulked. We build in ventilation so the wall and roof assemblies can dry, and we pick exterior materials and finishes that hold up to constant damp without staining or rotting. None of this is exotic — it's just coastal building done right, and it's exactly the kind of detail an inland builder who's never worked in the fog tends to underbuild. On a brand-new detached unit we get to do it correctly from the framing out, which is one quiet advantage of a ground-up build here.
I'll give a range, then tell you what bends it. Bay Area numbers look nothing like Sacramento. A detached unit in Daly City commonly lands in the $400K to $750K-plus band, all-in — design, engineering, permits, site work, the build, utilities, and finishes. A roughly 612 sq ft one-bedroom on a flatter lot sits at the lower end; a larger unit on a Westlake slope with heavier stepped foundation work climbs toward the top and past it. Three local things bend the number: the seismic and fault-zone engineering, the slope, and the high city permit fees and slow review. We don't quote blind — we walk the lot, get the soils, the fault line and the access right, then write a fixed price you can hold us to.
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
11 min read2,418 words8 sections
Building a Detached ADU in Daly City — A Straight Guide for Hillside Owners
A detached ADU is the version most Daly City owners actually picture: a freestanding unit with its own foundation, its own roof, and its own front door, set off the main house. It's also the version with the most moving parts, and this town adds a few the inland market never deals with. This guide is about building one here specifically — the City of Daly City permit path, the San Andreas Fault that dictates the foundation, the tight hillside lots, the constant fog, the steady rental demand, and the real Bay Area numbers. We're a Sacramento builder who extends out here, so I'll be honest about the two-hour drive and about where the math works.
01Section
What "detached" actually means here
Detached means freestanding. The unit doesn't touch your house — its own slab or foundation, its own roof structure, four of its own exterior walls. That's the line that separates it from an attached ADU, which shares at least one wall with the main home, and from a conversion, which reuses an existing shell. All three are legitimate ADUs under California law. They build differently, cost differently, and live differently, and detached is the most independent of the three.
The appeal of detached, and the reason it fits Daly City, is exactly that independence. Because it stands alone, we place it where the lot and the slope allow and orient it for light and the yard — not locked to the geometry of a 1950s Westlake tract box. On a small Daly City lot that flexibility earns its keep in a concrete way: we tuck the unit into the corner of the backyard that actually works on grade, clear of the main house. And for a rental this close to San Francisco, a genuinely separate dwelling rents better, and for more, than a converted bedroom.
