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Loomis · Detached ADU
A freestanding backyard unit, built for a Loomis country lot.
Its own foundation, its own roof, real distance from the main house — a true detached ADU on the kind of acre-plus Loomis property that has room to actually spread out.
Trusted by homeowners across Sacramento & surrounding areas.
Detached ADU in Loomis — fast facts
City
Loomis
ADU type
Detached ADU
Contractor license
CSLB #1119373
Free estimate
(916) 677-9774
Last updated
Stands completely on its own
A detached unit is a whole building
The thing that makes a detached ADU worth building is the same thing that makes it the hardest job on the menu: it shares nothing with your house. Its own slab. Its own walls. Its own roof. Last year off King Road we set a 624 sq ft single-story unit on a lot that ran better than an acre, and because it stood free we pulled it 95 feet back and faced the windows at the oaks instead of the gravel drive. That kind of separation is the whole reason people build detached in Loomis — the lots out here have room most towns can't offer. The price of it is a second foundation, a separate roof system, and a long materials path from the road to the back forty. We map every foot of that before you sign.
Independent foundation, framing, roof and exterior envelope
Sited and rotated for the oaks, the slope and the main-house sightline
Real separation — Loomis country lots have the room detached needs
Town of Loomis permitting
Permits go through the Town of Loomis
Loomis is an incorporated town — the Town of Loomis — so your detached ADU permit doesn't go to Placer County and it doesn't go to Rocklin next door. It goes through the Town's own small building department. That's a personal jurisdiction. The counter is a handful of people, not a giant regional machine, and that cuts both ways: you talk to a human who knows the parcels along Taylor Road, but a small office also moves at its own pace. We submit a full package — site plan, floor plan, elevations, structural, Title-24, the MEP sheets, and the PG&E service coordination. State law made the review ministerial, so a complete, code-compliant set has to get issued. We lean on that. Submit something thin and you'll burn correction rounds the Town never forced on you.
Reviewed by the Town of Loomis — not the County, not Rocklin
Small personal jurisdiction — you talk to people who know the parcels
Ministerial review under state law: a clean set must be issued
Access, PG&E and the trench
Getting materials and power to the back
Everything that builds a detached unit has to physically reach the spot. On a Loomis Basin lot that's usually no problem on width — long driveways, room to stage equipment, space the in-town lots never have. The catch here isn't width, it's distance and rock. A utility trench from the main house to a unit 100 feet back is a real run, and the ground under Loomis is foothill granite and decomposed granite — the same stuff the old citrus sheds were built around. Hit solid rock in that trench and you're into rock excavation, which is the single line that moves a Loomis budget the most. Power is PG&E out here. Not SMUD, not a city utility — PG&E, with its own service application and meter timeline. We measure access and probe the soil before we price anything.
Long utility runs from the main house planned and priced upfront
Rock excavation risk flagged before the trench, not after
PG&E service, panel and meter coordination — not SMUD
What the number actually is
What a detached ADU costs in Loomis
I'll give a range, then tell you why the range lies a little out here. A 600-ish sq ft one-bed detached unit with the finishes a Loomis owner tends to want generally lands around $262K to $335K all-in. Go bigger — 1,000-plus sq ft, two bedrooms, real cabinetry, fully separate utilities — and you're closer to $385K to $505K. Two honest caveats specific to this town. First, detached carries its own foundation and roof, so it never pencils cheaper than converting an existing structure. If budget alone is driving the call, that's a different conversation. Second, the granite. A footing or trench that hits foothill rock can add real money, and we won't pretend we can quote that blind. We walk the lot, probe it, then hand you a fixed price.
Fixed-price proposal after a free in-person Loomis site visit
Detached runs above a conversion — second foundation and roof
Rock excavation is the wildcard, so we probe before we quote
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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.
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Finance the build against your home's projected after-completion value.
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Specialized lenders who underwrite based on the rental income your ADU will produce.
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Roll the project into a new mortgage and keep one simple monthly payment.
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$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 Town of Loomis. Loomis is its own incorporated town, so your detached ADU permit, plan check, and inspections all run through the Town's building department — not Placer County, and not Rocklin next door. People assume a place this rural defaults to the County, and it doesn't. The Town counter is small and personal; you're often dealing with the same one or two people start to finish, which can be a real advantage on a clean submittal. The flip side of a small office is that it moves at its own pace, so we don't pad a set with sloppy sheets that invite extra correction rounds. We confirm your parcel is inside Town limits before we draw anything, because submitting to the wrong agency is a quiet way to lose two weeks.
PG&E. Not SMUD. This is the one that catches people moving up from Sacramento — SMUD covers the city and stops well short of the foothills — so in Loomis the service drop, any panel upgrade, and the new meter for your detached ADU all run through PG&E's application process, with its own forms and its own timeline. On a big country lot the run from the main panel to a unit set well back can be substantial, and if your main service is near capacity you're often looking at a panel upgrade before the unit can be energized. We engage PG&E early, while the foundation cures, so the meter isn't the last thing holding up your final sign-off.
It can, and it's the biggest budget wildcard in Loomis. This is foothill country — granite outcrops above grade in plenty of yards, decomposed granite running through the soil below — and a detached ADU carries its own new foundation plus a fresh utility trench, both of which dig into that ground. Hit solid rock and you're into rock excavation: hoe rams, sometimes rock saws, slower digging and more haul-off. On a clean lot it's a non-issue. On a rocky one it can add real money to the footing and the trench. We don't quote it blind — we probe the soil at the proposed pad and along the trench route during the site visit, so the number we hand you reflects what's actually under your dirt.
Yes, and it's a real Loomis step. A lot of these big lots run on septic rather than sewer, and an ADU adds bedrooms, which adds wastewater load. Before the unit goes forward, the inspector has to sign off that your existing septic system can handle the added bedroom load — and if it can't, you're looking at expanding the leach field or upsizing the tank. We check whether you're on septic or sewer on the first visit. If it's septic, we fold the load review into the timeline early, because finding out late that the system needs work is the kind of surprise that stalls a project for weeks.
Because you're pouring a brand-new foundation and framing a brand-new roof, plus all the exterior walls, siding, and weatherproofing of a standalone building. Converting a garage or an old outbuilding reuses a slab and a roof that already exist. On a Loomis lot that structural difference alone is often $50K to $80K for a 600 sq ft unit — and if the footing hits granite, the gap widens. Detached buys you a freestanding unit you can place and orient anywhere the setbacks allow, with genuine distance from the main house, which is exactly what these country lots are good for. But if the lowest possible price is the goal, a conversion almost always beats it.
Not always. State law lets a detached ADU under 750 sq ft keep shared utilities with the main house, which dodges thousands in separate-connection costs. Above 750 sq ft a separate water connection gets more likely. For a unit you plan to rent long-term, a separate PG&E meter is usually worth it so the tenant pays power directly. The Loomis wrinkle is the trench — separate meters and separate runs mean more digging across the lot, and on foothill ground every foot of that trench carries the rock-excavation risk. We design the utility plan around how you actually intend to use the unit and what the soil will allow.
Almost certainly — and fit is rarely the problem out here. The state floor is 4-foot side and rear setbacks for a detached ADU, and Loomis lots commonly run an acre or more, so you usually have room to spare. That's the upside of building detached in this town: you can pull the unit well off the main house, set it among the oaks, and give it a private approach without crowding anything. The real constraints aren't square footage. They're the rural-residential zoning rules that keep Loomis country, any horse-property or well-setback requirements, the septic load, and where the granite sits. We measure all of it on the first visit and show you what genuinely works before you commit.
Yes, and Loomis is one of the better places around to do it. On a typical city lot a detached ADU ends up 10 or 15 feet off the main house because that's all the yard allows. Out here the lots are large enough that we can place the unit 80, 100, sometimes 150 feet back — its own approach, its own outdoor space, oaks or a paddock between it and the main house. That's a genuinely separate dwelling, not a cottage shoved against the fence. It costs more to reach a pad that far out — longer driveway work, longer trench, more rock exposure — but the privacy you get on these country lots is the reason people build detached in the first place.
Usually, yes. Equestrian setups are common in the Loomis Basin, and the rural-residential zoning that keeps the town country generally supports a detached ADU alongside animal-keeping — but the details matter. Well setbacks, the location of corrals and paddocks, septic placement, and the Town's separation rules all shape where the unit can sit. The good news is space: a horse property has the acreage to drop a detached unit with real separation and still leave the equestrian footprint intact. We read the specific zoning and walk the whole parcel on the first visit, then site the unit so it works with the barn, the well, and the septic rather than fighting them.
For a complete, code-compliant set, the Town of Loomis typically returns first plan-check comments on a detached unit in roughly 4-6 weeks, usually with one correction cycle before issuance — though a small office's queue can stretch in a busy stretch. Total pre-construction — signed contract through permit-in-hand — normally runs 8-12 weeks once you fold in design, structural engineering, any septic load review, and the soils work the granite tends to require. On-site construction then runs 18-28 weeks. The Loomis-specific stretches are the trench and footing if rock shows up, and the septic sign-off if you're not on sewer. Submittal quality is the lever you actually control — a thin set triggers extra correction rounds that eat more calendar than the Town queue ever does.
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 read1,877 words8 sections
Building a Detached ADU in Loomis — A Straight-Talk Guide for Town of Loomis Property Owners
A detached ADU is the version most Loomis owners actually want: a freestanding unit with its own foundation, its own roof, and its own front door, set well off the main house on a lot that has the room for it. It's also the version with the most moving parts. This guide is about building one in Loomis specifically — the Town of Loomis permit path, the PG&E wrinkle that catches Sacramento transplants, the septic review, the foothill granite under your dirt, and the real 2025-2026 numbers. Most of what follows is what we'd tell a neighbor down Taylor Road.
01Section
What "detached" actually means here
Detached means freestanding. The unit doesn't touch your house — its own slab or stem-wall 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 just build, cost, and live differently.
The appeal of detached, and the reason it fits Loomis so well, is independence. Because it stands alone, we place it where the lot wants it and orient it for light, for the oaks, for privacy — not locked to the geometry of your house. A tenant or a parent gets a genuinely separate dwelling: their own entrance, their own outdoor space, no footsteps overhead. And on an acre-plus country lot, that separation can be real. The unit can sit a hundred feet back rather than crammed against a fence line.
