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Woodland · Attached ADU
Share one wall, gain a whole second home in Woodland.
An attached ADU grows off your Woodland house with its own front door, full kitchen and bath — engineered for the city's flat clay ground and built to satisfy the County seat's permit desk.
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Attached ADU in Woodland — fast facts
City
Woodland
ADU type
Attached ADU
Contractor license
CSLB #1119373
Free estimate
(916) 677-9774
Last updated
Joined, not freestanding
What an attached ADU actually is
An attached ADU shares exactly one wall with your existing Woodland house. That single wall is the whole difference between this and a freestanding cottage out back. Past it, the unit is its own home — a private entrance off the side or rear, a real kitchen, a full bath, a bedroom nobody reaches by walking through your living room. We hung a 478 sq ft one-bed off the east flank of a place over near the Spring Lake tracts, and the tenant and the owners never crossed paths indoors. The trade is structural. The new unit ties into your roofline, your foundation, and that existing wall — and on Woodland's deep clay, the foundation half is where the engineering shows up. Build it right and the seam disappears into the house.
Shares one wall; everything past it is fully independent
Private entrance, full kitchen, full bath, real bedroom
Ties into the existing roof, foundation and wall line
The wall between two homes
The shared-wall fire assembly
The wall you share stops being an ordinary interior partition the moment two separate dwellings sit on either side of it. Code wants a rated separation then — usually a one-hour fire assembly running floor to roof deck, the correct gypsum layers, fireblocking, and ideally a sound-rated cavity so your tenant isn't living inside your TV. People don't expect this part. On the older downtown homes — the Victorians and early Craftsmans around First Street and College — we've opened walls expecting plywood and found board sheathing, lath and plaster, no fireblocking, and wiring cooked through a century of valley summers. That existing wall almost always needs upgrading to carry the rating. We draw the assembly on the plans, build it to the listed spec, and the City inspector signs off on something real.
One-hour rated separation between the two dwellings
Sound-rated cavity so neither side hears the other
Old downtown walls usually need upgrading to hit it
City of Woodland permits
Permitting an attached ADU in Woodland
Woodland is its own incorporated city and the Yolo County seat, so a job inside city limits files with the City of Woodland — not the County, even though the County buildings sit right here downtown. That trips people up constantly. One Woodland wrinkle shapes the review more than anywhere else around: the historic district. The city holds one of the best collections of 1800s Victorian and Craftsman homes in California, and anything visible on a historic-home lot — College Street, First Street, the Dead Cat Alley and Stephens area — draws genuine design review on materials, rooflines, and trim. State ADU law keeps the review ministerial, but a thin set just buys correction rounds. We submit the whole package at once, historic detailing included.
City of Woodland building department, not Yolo County
Downtown historic district draws real design review
Materials, rooflines and trim get scrutinized on old lots
What the number really is
What an attached ADU costs in Woodland
Here's a range, then the honesty. A 472 sq ft one-bed attached unit with sensible mid-grade finishes generally lands around $214K to $276K all-in in Woodland. Go bigger — a 738 sq ft two-bed with its own utilities throughout — and you're closer to $298K to $384K. Attached usually pencils a touch under detached per square foot, because you borrow a wall and tap utilities already on that side of the house. The thing that moves the number here is underfoot. Woodland sits on expansive clay that swells and shrinks with the seasons, so we don't pour a plain slab and hope — it's an engineered foundation, often post-tension or a stiffened mat, sometimes piers. That's real money we price from a soils report, not a guess. We read the dirt early so the quote matches your actual ground.
Roughly $214K-$384K depending on size and finish level
Usually a bit cheaper per sq ft than a detached unit
Expansive clay drives an engineered foundation, not a plain slab
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— Tim, ADU Specialist
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$180,000Loan amount
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$1,320/mo
At 7.99% APR over 30 years (illustrative)
Often offset by $2,000–$3,500/mo in rental income
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Pre-qualification with no impact to your credit
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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.
An attached ADU shares one wall with your existing house and ties into its structure. A detached unit stands alone in the yard with its own foundation and roof, sharing nothing. Both are full independent homes with a private entrance, kitchen, and bath — the only real difference is whether the unit is physically joined to the main house. In Woodland, attached often wins for a money reason: the ground is expansive clay, so every new foundation has to be engineered, and a detached unit means a second fully engineered pad plus a long utility trench across the yard. An attached unit hangs off the house where the services already reach and the structure already founds, which fits a tighter side yard far better than a freestanding build on a standard town lot.
Once two separate dwellings sit on either side of a wall, code stops treating it as an interior partition and treats it as a separation between homes. That usually means a one-hour fire-rated assembly running from the floor to the roof deck, with specific gypsum layers and fireblocking. We almost always pair it with a sound-rated cavity so neither household hears the other. On the older Victorian and Craftsman homes near downtown Woodland the existing wall rarely meets the rating as it stands — lath and plaster, brittle wiring, no fireblocking — so part of the budget goes to bringing that shared wall up to spec before the new unit goes live. It's not glamorous work. It's the part that lets the inspector sign off and lets your tenant and your family genuinely live separate lives under one roofline.
If your parcel sits inside the City of Woodland limits, you file with the City of Woodland. Woodland is its own incorporated city — and it happens to be the Yolo County seat, so the County offices are physically right here in town, which fools people into thinking the County handles their permit. It doesn't. Unless your property is in the unincorporated county area outside city limits, the City of Woodland building department reviews and inspects the job. We confirm which department owns your parcel before drawing anything, because an attached unit's tie-in details — and any historic-district overlay — have to satisfy whichever building department actually runs plan check. Getting this wrong at the start wastes weeks you don't get back.
Yes. Woodland sits in PG&E territory — not SMUD, which serves much of Sacramento across the causeway. So your power coordination, any panel upgrade, and the meter decision all run through PG&E's process and timeline. For most attached units we sub-panel the ADU off an upgraded main service, which is cleaner and cheaper than a full second meter. If you want the tenant billed separately, a dedicated PG&E meter is on the table, and we handle the application either way. Start PG&E early regardless. Their timelines move on their own clock no matter how ready the rest of your project is, and waiting on a service upgrade at the end is a frustrating way to hold up a finished unit.
It's the Woodland-specific issue that quietly drives the number. The city sits on the flat valley floor on expansive clay — soil that swells when it's wet and shrinks when it dries through the long Central Valley summer. That movement will crack a plain slab and heave a footing that wasn't designed for it. So instead of pouring a basic slab and hoping, we engineer the foundation: often a post-tension slab or a stiffened mat that rides the soil movement, sometimes piers down to stable bearing, always off an actual soils report. For an attached unit that means the new foundation also has to transition properly into your existing footing without the two settling against each other. It's genuine cost — but skipping it is how you get a unit that cracks two summers in.
If your home sits in or near Woodland's downtown historic district, expect a closer look. The city has one of California's best collections of 1800s Victorian and early Craftsman houses, and the streets around College Street, First Street, and the Dead Cat Alley / Stephens area carry real design review that cares how new construction reads against those historic facades. State ADU law still applies, so an attached unit on a conforming lot is broadly protected, but the city genuinely scrutinizes materials, rooflines, and trim in the district. We design attached units in those neighborhoods to respect the historic character — matching trim profiles, period-appropriate siding, a roofline that defers to the original — rather than fighting it and collecting comments. Out in the newer Spring Lake subdivisions the historic constraint eases, though HOA rules can step in instead.
Square footage trips a few code triggers, and water service is the one that bites attached ADUs. Under 750 sq ft you can usually share the existing water service with the main house. At or above 750, you may be required to add a separate water meter and service for the new unit — a new tap into the City of Woodland main, a meter set, and the fees that come with it. On a flat town lot the trench routing is at least straightforward, but the tap and meter still add up. That's why we'll sometimes recommend holding a design at 742 square feet rather than nudging over the line for marginal extra room. The savings on the meter and the City tap fees can be worth more than the eight square feet you'd otherwise gain.
That tie-in is the heart of an attached build. The new roofline has to meet your existing roof in a way that sheds water and doesn't read as a tacked-on box — sometimes matching the existing pitch, sometimes a clean lower addition that reads as subordinate to the house, which matters even more on a historic-district lot. The new foundation either matches or properly transitions to your existing footing so nothing settles unevenly, and on Woodland's expansive clay that transition is engineered, not improvised. We detail both the roof and the foundation on the structural plans and match your siding or stucco and elevation — period trim where the historic district requires it — so the finished addition reads as part of the original house instead of an obvious add-on.
Usually, yes — that's one of the strongest cases for going attached here. Woodland is a real town with standard town lots, plenty of them narrow, especially the older downtown parcels. A detached unit needs its own setbacks, its own engineered pad on the clay, and a utility trench out to it. An attached unit borrows the house's existing wall and grade, so it tucks into a side or rear yard that a freestanding cottage simply couldn't use. We've fit attached units onto lots where there was no realistic way to land a detached cottage with the required clearances. State ADU law also protects a code-compliant attached unit's setbacks, so a tight lot rarely kills the project — it just shapes where the unit lands and how it ties in.
Woodland is about 25 minutes northwest of our Sacramento home base, straight up the causeway and Interstate 5. Close enough that we run crews there regularly and treat it as core territory, not an outlying job we visit twice. That matters on an attached build, where the tie-in details — the shared wall, the roof marriage, the foundation transition into existing clay-soil footings — reward a builder who shows up consistently and knows the City of Woodland inspectors and their plan-check habits. Woodland also runs more affordable than Davis right next door, with strong family and multi-generational housing demand, so an attached ADU here pulls real weight as a place for a parent, an adult kid, or a rental that holds value in a town people actually want to live in.
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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 read2,043 words8 sections
Attached ADU design and construction in Woodland
An attached ADU shares one wall with your house and almost nothing else — its own entrance, kitchen and bath, a complete second home joined to your first. We design and build them across Woodland, about 25 minutes northwest of our Sacramento base up the causeway. Most of this page is what we wish every homeowner knew before the first call: how the shared wall works, what the City of Woodland and its historic district want, and why the valley clay changes the foundation math.
01Section
Attached or detached on a Woodland lot
The first fork in any ADU conversation is attached versus detached, and in Woodland the lot itself tends to settle it before finishes come up. These are standard town lots on flat valley floor — a lot of them narrow, especially the older parcels closer to downtown. A detached unit on ground like that means a fresh building pad, its own engineered foundation on the clay, and a utility trench across the yard to reach it. That's all doable. It's just a second full foundation and a longer run of services.
An attached unit borrows what the house already has. It founds along the existing footing, taps utilities already on that side of the structure, and tucks into a side or rear yard with the setbacks the parcel can give. On a tight lot — common on a narrow downtown parcel once you account for clearances — attached fits where a freestanding cottage simply won't. We don't push one over the other before walking your land. On a roomier Spring Lake lot with space to the side, a detached or custom unit gives you a more private home. The lot width, the clay, and where your services run tend to decide it.
