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Davis · Detached ADU
A standalone backyard unit, engineered for Davis clay and trees.
Its own foundation, its own roof, real separation from the house — a true detached ADU sited around Davis's heritage trees and built on a foundation sized for that adobe clay.
Trusted by homeowners across Sacramento & surrounding areas.
Detached ADU in Davis — fast facts
City
Davis
ADU type
Detached ADU
Contractor license
CSLB #1119373
Free estimate
(916) 677-9774
Last updated
Freestanding, shares nothing
A detached unit is its own building
The thing that makes a detached ADU worth the money is also what makes it the hardest type to build — it shares nothing with your house. Own slab. Own walls. Own roof. We set a 612 sq ft unit on a Central Davis lot where the original 1960s slab had cracked corner to corner, and because the new unit stood completely free we placed it clear of an old elm's dripline and faced the glass into the yard instead of the fence. That freedom is why Davis owners go detached. The cost of it is a second foundation engineered for the clay, a separate roof, and a materials path from the street to the back. We map all of it first.
Independent foundation, framing, roof and exterior envelope
Sited around tree driplines and oriented for light, not the fence line
Most flexible ADU type — but a full ground-up build, not a conversion
City of Davis permitting
The City of Davis runs your permit
Davis is its own incorporated city in Yolo County, so this is straightforward in one way and stricter in another. Your detached ADU permit, plan check, and inspections all go through the City of Davis — not the county, not some unincorporated edge. One counter, one set of standards. The wrinkle is that Davis layers its own green-building reach codes on top of state CALGreen, leaning all-electric and solar-ready, tougher than the baseline most builders draw to. And the tree ordinance feeds straight into permitting too. We pull your zoning, the reach-code requirements, and any protected trees on the first visit, because all three shape the plan set before a single line gets drawn.
Reviewed by the City of Davis — single jurisdiction, Yolo County
Davis reach codes (all-electric / solar-ready) sit on top of CALGreen
Complete plan set drawn in-house, fewer correction rounds
The ground under Davis
Adobe clay needs an engineered slab
Here's the Davis fact that drives almost every detached job: the ground. Yolo adobe is expansive clay — it swells when wet and shrinks when it dries, and it does that every season. That's the reason original 1960s slabs around Central Davis crack corner to corner. A detached ADU carries its own new foundation, so we don't drop a generic pour on that soil and hope. We get a soils report and engineer the foundation to it — usually a post-tension slab, sometimes deepened and reinforced footings — sized to the actual swell potential of your lot. The terrain itself is flat and easy, which helps. But the slab under that flat ground is where the engineering money goes.
Soils report drives the foundation — post-tension slab or deepened footings
Sized to your lot's swell potential, not a one-size pour
Flat terrain keeps grading and access simple across most of Davis
Davis trees and utilities
Siting around protected Davis trees
The other thing that shapes a Davis build is the trees. The city has a strict tree ordinance — protected city trees, mandatory street trees on the parkway strips, and mature heritage elms and oaks all through Old North and Old East Davis. So siting a detached unit isn't just about setbacks. We map the driplines, and on most jobs that means an arborist report and a tree permit before we touch the back of the lot. Build inside a protected dripline without that and you can stall the whole job. Power is PG&E, and a true detached unit gets its own utility runs — a trench from the main service back to the unit for power, water, and sewer. We plan the tree-safe route for that trench upfront.
Arborist report and tree permit where driplines are in play
Siting works around protected, street, and heritage trees — routine here
Separate PG&E power, water and sewer runs on a tree-safe trench route
Build Smart. Invest Wise.
Build Your ADU. Your Investment, Your Future.
From design to move-in, we handle everything. Transparent pricing, on-time delivery, and uncompromising quality.
Custom Designs
Tailored to you
Built to Last
Premium materials
Fast Turnaround
On-time delivery
Full-Service
From start to finish
30+
Years of Experience
120+
ADU Projects Completed
100+
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Built for Value. Designed for Life.
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.
With the City of Davis. Davis is its own incorporated city in Yolo County, so unlike a lot of the region there's no county-versus-city question — your detached ADU permit, plan check, and inspections all run through the City of Davis building department, on city standards and city fees. The thing people miss is that Davis doesn't stop at the state code. It layers its own green-building reach codes on top of CALGreen, leaning all-electric and solar-ready, and the tree ordinance feeds into the same review. We confirm all of that on the first visit so the package is built for the Davis counter from the start, not patched after a correction.
It's the single biggest thing about building in Davis. The ground here is Yolo adobe — expansive clay that swells when it gets wet and shrinks back when it dries out, season after season. That movement is exactly why so many original 1960s slabs around Central Davis are cracked corner to corner. A detached ADU pours a brand-new foundation, so if you set a generic slab on that soil it'll eventually do the same thing. We don't. We get a soils report and engineer the foundation to your lot — typically a post-tension slab, or deepened and reinforced footings — sized to the measured swell potential. It costs more than a plain pour. It's also the difference between a slab that lasts and one that fails.
Often, yes — and it's worth checking before you fall in love with a spot. Davis has a strict tree ordinance: protected city trees, mandatory street trees on the parkway strips, and a lot of mature heritage elms and oaks, especially through Old North and Old East Davis. A detached ADU goes in the backyard, and if your target location sits inside a protected tree's dripline, you're looking at an arborist report and a tree permit, and possibly a siting change. We map the driplines on the first visit and design the unit to respect them. Building inside a protected dripline without the permit is a fast way to stall the whole job at inspection.
PG&E. Not SMUD. SMUD covers Sacramento and stops east of the Causeway, so once you're in Davis the service drop, any panel upgrade, and the new meter for your detached ADU all run through PG&E's application process — its own forms, its own timeline. A true detached unit needs its own utility runs, which means a trench from the main service back to the unit for power, water, and sewer. On a Davis lot we route that trench around protected tree roots, not straight through them. We engage PG&E early, while the foundation cures, so the meter isn't the last thing holding up your final sign-off.
Reach codes are local green-building rules that go beyond the state baseline, and Davis has them. On top of California's CALGreen, the city pushes toward all-electric construction and solar-ready design — stricter than what most contractors draw to by default. For a detached ADU that usually means electric heat pump heating and water heating instead of gas, an electrical service sized for it, and the unit set up to take solar. It's not a dealbreaker, and honestly it's where new construction is headed anyway. But it's real design input and a little more cost, and we price it in from the start so it isn't a surprise that shows up at Davis plan check.
Davis is about as strong a rental market as this region has, and it comes down to UC Davis. A university town runs on student and faculty rental demand, year after year, and a detached ADU with its own entrance and real separation from the main house is exactly the kind of unit that market wants. Flat, bike-everything town, close to campus — it rents. We don't quote rents, that's your call and the market's, but the demand is why so many Davis owners go detached over a conversion: a freestanding unit reads as a genuine separate dwelling, not a converted garage, and tenants pay for that separation.
In one way, yes — and it's a real upside. Davis is flat. No slope grading, no retaining walls, no cutting a level pad out of a hillside, and the materials path from the street to the backyard is usually short and clear. That keeps site work simple compared to the foothills. The catch is that the easy part is the surface. The hard part is underneath: that flat ground sits on expansive adobe clay, so the foundation engineering is where the work goes, not the grading. So the honest answer is that Davis trades the slope problems of the foothills for a soil problem — and the soil problem is the one that needs an engineer, not a bulldozer.
Because you're pouring a brand-new engineered foundation and framing a brand-new roof, plus all the exterior walls, siding, and weatherproofing of a standalone building. A garage or structure conversion reuses a slab and a roof that already exist. In Davis the foundation gap is wider than usual, because the new slab has to be engineered for expansive clay rather than dropped on the ground — that's real money a conversion skips. On a Davis lot the structural difference alone often runs $55K to $90K for a 600 sq ft unit. Detached buys you a freestanding unit you can place and orient anywhere the setbacks and trees allow. If lowest price is the only goal, a conversion usually wins, and we'll say so.
I'll give a range, then tell you why it bends. A roughly 600 sq ft one-bedroom detached unit, finished the way a Davis owner expects, generally lands around $265K to $345K all-in for 2025-2026 — design, engineering, permits, site work, the build, utilities, and finishes included. Go bigger — 1,000-plus sq ft, two bedrooms, separate utilities — and you're closer to $385K to $510K. Two Davis-specific things bend the number: the engineered foundation for expansive clay, which costs more than a plain slab, and any tree work or rerouting the ordinance forces. The flat terrain helps the other direction. We don't quote blind — we walk the lot, pull a soils report, check the trees, then write a fixed price.
Yes — the older homes of Old North and Old East Davis with their heritage elms and oaks, the cracked-slab 1960s ranches of Central Davis, and the newer subdivisions out in West Davis, Wildhorse, and Mace Ranch. Each pocket has its own quirks: the older neighborhoods are heavy on protected trees, and the whole city sits on that adobe clay. Davis is about 20 minutes west of our Sacramento home base, straight over the Causeway, well inside our service area. We know what the City of Davis, the tree ordinance, and the reach codes flag before they flag it. We build detached units across all of it.
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 read1,995 words8 sections
Building a Detached ADU in Davis — A Straight-Talk Guide for Yolo County Owners
A detached ADU is the version most Davis owners actually want: 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 Davis adds a couple the rest of the region doesn't. This guide is about building one here specifically — the City of Davis permit path and its reach codes, the expansive adobe clay that dictates the foundation, the tree ordinance that shapes where the unit can even go, the strong UC Davis rental demand, and the real 2025-2026 numbers. We build these for a living, so most of what follows is what we'd tell a neighbor over the fence.
01Section
What "detached" actually means here
Detached means freestanding. The unit doesn't touch your house — its own slab foundation, its own roof structure, four of its own exterior walls. That's the line separating 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, cost, and live differently, and detached is the most independent of the three.
The appeal of detached, and the reason it fits Davis, is that independence. Because it stands alone, we place it where the lot wants it and orient it for light and for the yard — not locked to the geometry of your house. In Davis that flexibility earns its keep in a specific way: it lets us work around the trees. A detached unit can be slid clear of a protected elm's dripline in a way an addition bolted to the house simply can't. And for a rental in a university town, a genuinely separate dwelling rents better than a converted room.
