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Concord ADU Builder
Sacramento-built ADUs for the Concord backyard.
We're a Sacramento design-build crew that runs the bigger Concord jobs — Dana Estates ranch lots, the Clayton Valley slopes, a Sun Terrace conversion — and Concord's roomy postwar yards make the drive across the Carquinez worth it.
Trusted by homeowners across Sacramento & surrounding areas.
ADUs in Concord — fast facts
County
Contra Costa County
Region
Bay Area
ADU types we build
Detached, Attached, Garage Conversion, Custom
Contractor license
CSLB #1119373
Free estimate
(916) 677-9774
Last updated
Concord lots actually have room
Concord's ranch tracts and the Mount Diablo edge
Concord surprises people who only know the inner Bay. It boomed in the 1950s and '60s as the place families moved for a yard, so Dana Estates, Sun Terrace, Holbrook Heights and the tracts off Clayton Road run single-story ranch homes on six-to-eight-thousand-square-foot lots with attached garages and room behind the house — a detached ADU pencils here without the crane-and-carry circus the peninsula forces. The east edge tilts toward Mount Diablo, though, and the Clayton Valley and Crystyl Ranch lots get bigger but steeper, on trickier soil. So on the free first walk our PM reads which Concord you're in: real setbacks taped off the fence, the slope read, and the expansive Contra Costa clay flagged before a foundation is drawn.
Free on-site walk before a dollar gets committed
Real setbacks taped off the fence, not the parcel map
Flatland vs. foothill read on the first visit — slope and clay soil flagged honestly
Concord runs its own counter
Permitting through the City of Concord
A detail that saves Concord homeowners money: your ADU runs through the City of Concord, not Contra Costa County, and the Building Division on Galindo Street, a block off Todos Santos Plaza, is one of the better-run ADU counters in the East Bay. The city even gives away pre-approved ADU plans — pick one that fits your lot and, because it's already vetted, the permit can clear in as little as five working days. A stock plan rarely fits a real backyard, though, so most larger jobs go custom: full drawings (floor plan, structural calcs, Title 24, a site plan off the real setbacks) on the state's 60-day clock. Discretionary review is gone, so no neighborhood hearing, but sloppy submittals draw correction cycles — so we send a complete in-house set and answer the city's comments ourselves.
Permit pulled through the City of Concord Building Division — city project, not county
Free pre-approved plan path can issue in ~5 working days when it fits your lot
Complete custom set: site, structural, Title-24, MEP — corrections answered by the drafter
The Concord catch we won't soften
The Concord Fault creeps through downtown
Here's the honest negative most builders don't even know to mention: the Concord Fault runs straight through town, and unlike most Bay Area faults this one creeps, sliding about 3 millimeters a year through downtown. You can see it — in southeast Concord and toward northeast Walnut Creek it has slowly offset curbs and sidewalk slabs sideways. If your parcel falls inside the state's Alquist-Priolo zone, building near the trace triggers a fault-rupture study and a possible setback — a real cost a contractor bidding off a photo never sees. The creep counts too: structures spanning the trace can get racked over the years, so foundation type and placement matter. And Contra Costa's expansive clay cracks slabs that weren't engineered for it, so we pull the fault map and read the soil for your exact parcel first.
Alquist-Priolo fault-zone status checked for your exact parcel up front
Fault creep accounted for in foundation type and unit placement, not ignored
Expansive Contra Costa clay engineered for — never poured on a hopeful flat slab
Real Concord numbers
Dana Estates costs and North Concord BART rents
Concord sits a notch below the inner Bay and the peninsula, so a builder quoting you like Palo Alto is padding the number. For 2025 into 2026 on a flat Dana Estates or Sun Terrace lot, a 612 sq ft one-bedroom detached ADU with mid-grade finishes runs roughly $320K to $420K all-in, a 960 sq ft two-bedroom near $450K to $570K, and a garage conversion around $215K to $315K while keeping your yard. The swing items are foundation and geology — an Alquist-Priolo parcel, a Clayton Valley slope, or bad clay each adds real money. Two BART stations, Concord and North Concord/Martinez, plus Highway 4 and I-680, put one-bedroom rents near $2,200 to $2,800 a month and two-bedrooms at $2,800 to $3,600. Every prospect gets a fixed-price proposal after the free walk, financing available — a change order only shows up if you upgrade a finish.
612 sq ft detached one-bed: roughly $320K–$420K all-in on a flat lot (2025–2026)
Concord one-bed ADU rents around $2,200–$2,800/mo; two-bed $2,800–$3,600
Fixed-price contract — itemized scope, financing available if you want it
ADU Services
Pick the ADU that fits your Concord lot
Detached, attached, garage conversion, or fully custom — we design, permit, and build every type of ADU under one roof in the Greater Sacramento Area. Tap a card for the details.
“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.
The City of Concord, in almost every case. Concord is incorporated, and its Building Division at City Hall on Galindo Street downtown handles your ADU's permit, plan check, and inspections start to finish — you can reach them at (925) 671-3107. Contra Costa County's building department only has authority over unincorporated land, which around Concord means pockets like parts of Clayton's edges or unincorporated Contra Costa Centre near the Pleasant Hill BART line, not the bulk of the city. The vast majority of Concord addresses are city jurisdiction. We confirm which agency governs your exact parcel on the first visit so a plan set never lands on the wrong desk.
Yes, and it's one of the best deals in the East Bay if a stock plan fits your lot. The City of Concord maintains a library of pre-approved ADU designs — the plan itself is already vetted by the city, so it skips the design cost and shortcuts the review. When your site-specific sheets are accurate and complete, a permit on a pre-approved plan can issue in as little as five working days. The catch is fit: a stock footprint rarely lands perfectly on a real backyard with real setbacks, a specific slope, or an existing tree you want to keep. We'll tell you honestly on the walk whether a free pre-approved plan works for your lot or whether a custom design earns its keep — sometimes the stock plan is genuinely the right call, and we'll say so.
Usually yes, and that's one of Concord's real advantages over the inner Bay. State law lets you build a detached ADU up to 800 sq ft (and frequently larger) with reduced 4-foot side and rear setbacks. Concord's postwar tract neighborhoods — Dana Estates, Sun Terrace, Holbrook, the streets off Clayton Road — tend toward 6,000 to 8,000 sq ft lots with real backyards and a usable driveway, so there's room to build and room to get a crew and concrete to the back without crane-and-carry. The foothill lots out toward Clayton Valley and Crystyl Ranch are often bigger still, just with more slope. We tape your real setbacks and measure access on the first walk so the floor plan fits the dirt you actually have.
It rarely blocks it, but it genuinely changes the front end, and this is a real Concord issue rather than boilerplate — the fault is named after the city and runs right through it. The Concord Fault is unusual because it creeps: it slides a few millimeters a year on its own, enough that you can see offset curbs and sidewalk slabs where it crosses streets in southeast Concord. If your parcel falls inside a state Alquist-Priolo earthquake fault zone, building new habitable space can trigger a fault-rupture study — a geologist's review, sometimes a trench, and a required setback from the trace. On top of that, the slow creep means foundation type and where the unit sits on the lot actually matter near the trace. We pull the fault map for your exact address on the first visit and tell you straight whether you're inside the zone.
On a friendly flatland lot, budget about $320K to $420K all-in for a 612 sq ft one-bedroom detached ADU with mid-grade finishes, and roughly $450K to $570K for a 960 sq ft two-bedroom with upgraded finishes. A garage conversion, where the slab and headroom cooperate, often comes in lower — around $215K to $315K — and keeps your yard intact. Concord sits a notch below the inner Bay and the peninsula, so don't let anyone quote you like San Francisco. The biggest cost drivers after size are the foundation and the geology: a fault-zone parcel, a Clayton Valley slope, or expansive clay can each add real money over a plain slab, plus any electrical panel upgrade. You get a fixed-price proposal after the free walk, so the final number is locked before you sign rather than guessed at.
Because it's still the Bay Area, even if it's the more affordable inland end of it. Labor rates, material delivery, seismic detailing, fault-zone studies, and the expansive-clay foundations all run higher in Concord than in the Sacramento region. A flatland 612 sq ft one-bed that might land in the low $200Ks inland runs roughly $320K to $420K all-in here. The flip side is the rent and the land value: Concord one-beds rent for $2,200 to $2,800 a month, the lot is worth far more than its inland equivalent, and you've got two BART stations feeding the Oakland and San Francisco job markets. The investment pencils, but only off real Concord costs — we quote off this market, never an inland price sheet.
Yes, and slope is something we deal with constantly, in Sacramento's foothills and out here — it just has to be priced honestly from the start. A sloped Clayton Valley, Crystyl Ranch, or Lime Ridge-edge lot usually means a stepped foundation, deeper footings, or piers into competent soil at the downhill end, plus a grading and drainage plan the city will want. Contra Costa's expansive clay makes drainage detailing matter more here than people expect, because clay that stays wet against a footing is a problem. The upside is those foothill lots are often big with a view, and the rents support the build. We read the grade and the soil on the first walk and tell you straight whether you're looking at a modest hillside foundation or a serious one, so the number reflects the actual dirt.
It's a real line item and a real schedule item, not an afterthought. Concord is served by the Contra Costa Water District, and a new ADU often needs its own meter or coordination with the district on capacity — which means a Facility Reserve Charge, a connection fee CCWD levies because a new unit adds demand to the system. Those fees and the meter set run on the district's clock, separate from the city building permit, and they can lag if nobody pushes them. We get the water question moving early rather than discovering at the end that the meter is the thing holding up your final sign-off. The utility coordination goes into the project scope from the start so it isn't a surprise delay between a finished unit and an occupancy approval.
It depends heavily on which path you take. On a free pre-approved plan that fits your lot, the city can issue in as little as five working days once your site-specific sheets are complete and accurate — that's genuinely fast. A custom design runs on the state's 60-day clock for the city to approve or return corrections, and discretionary review is gone, so there's no neighborhood hearing to derail you. Realistic timing from signed contract to permit in hand runs about 8 to 16 weeks for a custom Concord ADU, depending on how clean the drawings go in and whether the lot triggers a fault study or geotech. We fight the wait with a complete in-house set so the same drafter who drew the sheet answers the counter's comment on it.
Yes, deliberately and for the right projects. We're a Sacramento design-build outfit, CA license #1119373, and Concord is roughly an hour-plus run from our home base — down I-680 or across the Carquinez Bridge off I-80, depending on the day. We don't pretend that's around the corner. What it means is we take the larger Concord ADU jobs where homeowners want Sacramento-area craftsmanship and pricing discipline on a build worth the travel: a detached unit on a roomy tract lot, a serious garage conversion, a foothill build out toward Clayton Valley. Those justify the trip and get a steady crew presence, not a contractor who vanishes for two weeks. Call (916) 677-9774 and we'll talk through whether your project is the right fit for the drive.
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We treat every home like it's our own — quality work, clear communication, and happy homeowners.
PaulOwner · Future Generation
7 min read1,625 words8 sections
Building an ADU in Concord: a Sacramento contractor's honest read on Contra Costa's biggest city
Concord is the largest city in Contra Costa County, and for ADUs it's quietly one of the friendlier places to build in the Bay Area. The lots are roomy — postwar ranch tracts with real backyards, not 30-foot peninsula slivers. The city runs its own permit counter and gives away pre-approved plans that can clear in days, and two BART stations carry the rent math. The honest catch is underfoot: the Concord Fault runs through downtown and actually creeps, and the county's expansive clay punishes a lazy foundation. We're a Sacramento design-build crew that takes the Concord jobs worth the drive. Here's the straight version.
01Section
Why Concord's postwar tracts suit an ADU
Concord grew up fast and grew up flat. Small farming town until the postwar decades, when the East Bay sprawled out and this became the place families landed for a yard and a garage they could afford. That left a housing stock the older inner-Bay cities don't have: block after block of single-story 1950s and '60s ranch homes on real lots. Dana Estates, Sun Terrace up by the North Concord BART station, Holbrook, the tracts off Clayton Road — 6,000-to-8,000-square-foot parcels with driveways wide enough to back a trailer down.
That roominess is the whole game for ADUs. The most expensive variable on a tight inner-Bay lot is access: getting a crew, concrete, and lumber to the back of a property boxed in on every side. Concord's flatland tracts often hand you that access for free, so a detached unit pencils here without the pump trucks and hand-carried lumber the peninsula forces. A modest ranch clears well over its inland equivalent, and a one-bedroom rents like a small house — so the unused 700 square feet out back becomes the best thing you can build on.
