Fast, Reliable New Detached ADU Across Antelope
A new detached ADU in Antelope typically runs $180,000 to $340,000 all-in, drawings through final inspection, depending on size, site conditions, and whether you choose custom framing or a prefab system. The permit lands on Sacramento County’s desk, not a city counter. That one fact changes the setback checks, the drainage requirements, and the inspection schedule for your project. Our team has pulled county permits for detached ADUs across Antelope since 2015, and we scope every acreage parcel before quoting so the written price you sign is the price you pay. Call (971) 497-2402 for a written estimate on your Antelope property.
Why Ellery ADU Studio Is Antelope’s Preferred New Detached ADU Company
Antelope is unincorporated Sacramento County. That is not a technicality. When a neighbor in Citrus Heights applies for an ADU permit, they file through the City of Citrus Heights. When you apply for a New Detached ADU on your Antelope parcel, you file through Sacramento County’s planning and building departments, which maintain their own fee schedule, their own setback standards, and their own review timelines. A contractor who has only pulled permits in incorporated cities walks into their first Antelope project blind. We don’t. Since 2015, Ellery ADU Studio has designed, permitted, and built 900+ ADUs, and the county-specific site plan requirements on Antelope acreage are documented in our permit sets before we ever break ground.
Nadia Ellery founded this studio the year California’s ADU permitting landscape shifted, and the core product has been the same ever since: a permit set that survives county review, paired with construction under the same contract at the same written price. No designer-versus-builder gap. No “call for a quote.” Haven Standard Clause 1 says a written price before any work starts, and that applies to every Antelope project we scope. Homeowners off Walerga Road, Elverta Road, and Antelope Road call us because the estimate they receive has the county’s septic and well setback checks already accounted for.
Our New Detached ADU Services in Antelope
Custom Built ADU
A custom-framed detached ADU on an Antelope acreage parcel gives you full control over roofline, window placement, and interior partition layout. This matters when your lot has a specific buildable envelope dictated by well and septic setbacks. We design to the county’s constraints, not against them. Most custom ADUs in Antelope run $220,000 to $340,000 depending on finish level and site prep, and every one starts with a written scope that locks at signing under Haven Standard Clause 5.
Prefab ADU Installation
Prefab systems change the math on Antelope acreage, where long material hauls and open-lot grading can stretch a custom build timeline. We specify and coordinate Dvele, Abodu, and Cover modules, then handle the foundation, utility trenching, and county inspections under the same single contract. A prefab ADU on an Antelope lot typically lands between $180,000 and $280,000, with module delivery scheduled after the county approves the site plan, not before. The written price includes the pilot car and crane coordination.
Modular ADU
Modular ADUs share prefab’s factory-built precision but arrive in larger sections that require careful access planning on Antelope’s acreage parcels. We have run modules down Walerga Road on lowboys with pilot cars and swung them into rear-yard pads with less than ten feet of crane clearance. The county’s grading and drainage plan conditions apply the same as any other build, and we fold that documentation into your permit set before the modules are ordered. Modular ADUs in Antelope run $200,000 to $300,000 all-in.
Studio ADU
A studio ADU is the most cost-efficient detached build on an Antelope lot, which is why so many homeowners choose it for rental income or a home office beyond the main house. A 400 to 500 square foot studio with a full bath and kitchenette typically runs $150,000 to $220,000 in Antelope, including the county’s required mini-split heat pump system. Sacramento Valley summers regularly push past 100°F, and a studio ADU without dedicated mechanical cooling is not a buildable option. We include it in every written estimate.
1-Bed and 2-Bed ADU
One-bedroom and two-bedroom detached ADUs serve Antelope homeowners who want a true second dwelling, not a guest room. On acreage parcels, the extra square footage means more attention to the county’s septic capacity review. If your existing system cannot absorb the additional bedroom count, we scope the upgrade before quoting, so the written price is real. Expect $190,000 to $280,000 for a 1-bed and $230,000 to $340,000 for a 2-bed on an Antelope lot, depending on site conditions.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Antelope
We specify and coordinate prefab and modular systems from Dvele, Abodu, and Cover, and we know how each brand’s engineering documents interact with Sacramento County’s ADU review process. Dvele’s panelized system, for example, arrives with structural calculations that the county’s plan check division accepts without the back-and-forth some other manufacturers trigger. When we quote a prefab ADU in Antelope, the brand is named in the written scope, the delivery logistics are priced, and the county permit set references the manufacturer’s drawings line by line. We also coordinate James Hardie siding and Tuff Shed structures where a detached ADU pairs with an existing outbuilding.
Common New Detached ADU Problems We See in Antelope Homes
- Permit filed with the wrong jurisdiction. Antelope is unincorporated Sacramento County, but plenty of homeowners fill out a City of Sacramento application out of habit or confusion. The stop-work order comes when the inspector realizes the parcel is county jurisdiction, and the project stalls for weeks while the correct filing is processed. We verify jurisdiction before any paperwork leaves our studio.
- Foundation inside a septic or well setback. Sacramento County enforces specific minimum distances between any new structure and an existing septic leach field or domestic well. On Antelope acreage, a foundation poured too close means a redesign after excavation, not a minor adjustment. Our site surveys flag these setbacks before the first shovel.
- No grading and drainage plan. The county attaches a site-plan condition requiring on-lot drainage calculations for detached ADUs on open lots. A builder who skips this ends up with a failed final inspection after the first winter storm. We produce the grading plan as part of the permit set, every time.
- Undersized electrical service. Antelope’s 1980s and 1990s tract homes often have 100-amp panels that cannot serve a detached ADU plus the main house. We scope the subpanel upgrade and the trench run in the original written estimate, so it never arrives as a door-side upsell.
Pricing for New Detached ADU in Antelope, CA
A new detached ADU in Antelope runs $180,000 to $340,000 depending on the build type. Studio ADUs on flat, accessible parcels start around $150,000 to $220,000. One-bed and two-bed units add square footage and septic capacity review, landing between $190,000 and $340,000. Prefab and modular systems from Dvele, Abodu, and Cover shift the range depending on site access, crane requirements, and the haul distance from the manufacturer’s delivery point. Every number above includes the permit set, the county fees, the utility connections, and the written warranty. Your written price is locked before any work begins under Haven Standard Clause 1. Call (971) 497-2402 for a written estimate on your specific Antelope parcel.
What Changes the Price on Antelope Acreage
Long material haul from Sacramento’s main building supply yards runs 15 to 25 miles one way depending on your parcel’s distance from the Interstate 80 corridor. Grading costs rise when the county’s drainage plan requires a 2% pad slope away from the unit and the existing lot is dead flat. Trenching for a 100-amp subpanel can add $8,000 to $15,000 when the run crosses 100 feet or more of open lot. We price all of it in the original written estimate, never as a change order after excavation begins.
We Also Serve Cities Near Antelope
Ellery ADU Studio builds new detached ADUs in Antelope and across the surrounding Sacramento County and Placer County suburbs. Our crews serve North Highlands, Citrus Heights, Carmichael, and Fair Oaks with the same one-contract design-build model and the same written-price guarantee.
Serving Antelope, CA - Our Local Coverage Area
We’re based in the Antelope area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - New Detached ADU in Antelope
Most Antelope acreage parcels can tie a detached ADU into the existing septic system, but only if the system has the hydraulic capacity to absorb the additional bedroom count. Sacramento County’s environmental health division reviews the existing system’s design capacity during permit review, and a one-bedroom ADU typically adds less load than a two-bedroom. If the system needs an upgrade, we scope it in the written estimate before you sign. Call (971) 497-2402 and we will pull your parcel’s septic records before quoting.
Yes, but proximity to an outbuilding or barn can trigger Sacramento County fire-safety review depending on the distance between structures and the occupancy type of the existing building. The county’s fire marshal may require a rated wall assembly or additional defensible-space clearing if the ADU sits within a specific distance of a barn or shop. We map this during the site survey and include any required fire-safety measures in your written price.
Yes, the haul adds cost, but less than most homeowners expect. The 15 to 25 mile delivery from Sacramento’s supply yards to an Antelope parcel typically adds $3,000 to $8,000 depending on the number of concrete pours, framing packages, and prefab module deliveries. Prefab builds see the largest haul line item because module transport requires a lowboy trailer and pilot car. We itemize this cost in your written estimate so you can compare it directly against an incorporated city quote.
Yes. Even when your Antelope lot already drains into a street swale, Sacramento County requires a site-specific grading and drainage plan for a new detached ADU on an open lot. The plan must show a 2% slope away from the unit, and the county verifies it during final inspection. On a lot off Walerga Road, we graded the pad and ran the drainage calculations before the county’s final check, and the project passed on the first inspection.
Sacramento County requires a minimum horizontal distance between a new detached ADU and an existing domestic well, and the setback applies to the building footprint, not just the foundation edge. On a recent Antelope project, we set a Dvele prefab ADU 75 feet from the domestic well and 100 feet from the septic leach field to match the county’s minimums precisely. We verify these setbacks during the site survey so your written estimate reflects the actual buildable envelope on your parcel.
Get Your Written Estimate for a New Detached ADU in Antelope
If you own acreage in Antelope and you are weighing a detached ADU, the first step is a written estimate that names the county’s permit requirements, the setback checks, and the haul costs for your specific parcel. We do not quote over the phone without seeing the site, and we do not ask you to “call for a quote.” We send a written price. Call (971) 497-2402 to schedule your site survey and written estimate.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Antelope since 2015.
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