New Detached ADU in Roseville - Plans, Permits & Build, One Fixed Price

Fast, Reliable New Detached ADU Across Roseville

A new detached ADU in Roseville typically runs $220,000-$380,000 all-in, from the first architectural drawing through final inspection, depending on square footage, site utilities, and the HOA review path your project has to clear. The piece most people miss: in Roseville, you’re not just getting a city permit. Most of the master-planned neighborhoods here require HOA architectural committee approval before the city accepts your application, and Roseville Electric has its own electrical forms and fee structure separate from PG&E. Miss either track and a straightforward ADU project stalls for weeks. That’s the part we handle. Ellery ADU Studio has designed, permitted, and built detached ADUs across Roseville since our founding, and we sequence the HOA packet, the city submittal, and the Roseville Electric load calculations as one timed workflow, not three separate surprises.

Call (971) 497-2402

Call us at (971) 497-2402 to talk through your lot in Roseville. There is a written price before any work starts, on every project. That’s Haven Standard Clause 1.

Why Ellery ADU Studio Is Roseville’s Preferred New Detached ADU Company

We’re a design-build studio, not a general contractor handing drawings to a sub. The permit set, the engineering, the construction, and the Roseville Electric subpanel coordination are one contract at one written price. That contract structure removes the designer-versus-builder blame gap that quietly wrecks a lot of Roseville ADU projects. If the finished ADU doesn’t match the permitted drawings, the 365-Day Done Right Promise is in writing before we start.

Our work in Roseville spans the neighborhoods that make this city distinct: Fiddyment Farm, Westpark, Stanford Ranch, Woodcreek, Morgan Creek. We know the Roseville Electric load-calculation sheets, the HOA submittal formats in each community, and the Placer County building codes that govern unincorporated pockets near the city line. Since 2015, the studio has designed, permitted, and built 900+ ADUs, every one with a written price before work began and a documented photo record when work was complete.

Nadia Ellery, the studio’s founder, reviews the permit set on every Roseville project before it goes to the city. That’s not a sales promise; it’s how the studio’s QA process works.

Our New Detached ADU Services in Roseville

The exact ADU type that fits your Roseville lot depends on setbacks, HOA design guidelines, and how your existing home is oriented. Here’s how we approach the four most common paths for a New Detached ADU in Roseville.

Custom Built ADU

A custom detached ADU in Roseville usually lands between $260,000 and $380,000 for a one-bedroom or two-bedroom design, including site work, utilities, and all permits. On a 7,000 sq ft lot in Westpark or Woodcreek, a custom build lets you place the ADU to preserve the backyard’s usable space. We document every step: the permit set with Roseville Electric load calcs, the HOA approval letter, the framing inspection photos, and the final Title 24 commissioning report. Because the studio carries both the design and the construction in one contract, the person who draws the roof pitch is the same team accountable for building it.

1-Bed & 2-Bed ADU

In Roseville, a one-bedroom detached ADU of about 500-600 sq ft typically runs $220,000-$280,000. A two-bedroom of 800-1,000 sq ft runs $300,000-$380,000. The addition of a second bedroom changes the parking review, the Title 24 energy model, and sometimes the HOA’s floor-area ratio calculations. We’ll show you the dollar line items for each before you choose.

Prefab ADU Installation

We specify and coordinate prefab systems from Abodu, Cover, and Dvele inside the same single contract we use for stick-built work. A prefab detached ADU in Roseville can run $250,000-$340,000 depending on the manufacturer, the crane access, and the foundation scope. One caution specific to Roseville: many HOAs want the exterior siding and window trim to match the primary home’s stucco or board-and-batten profile. We coordinate those finish packages with the prefab manufacturer before the factory locks the panel schedule.

Studio ADU

A studio detached ADU of 350-450 sq ft in Roseville typically runs $200,000-$260,000. These fit well on the 6,000 sq ft lots common in older communities like Sun City Roseville or the homes along Foothills Boulevard. The compact footprint helps with setback compliance, but the HOA still reviews the roofline and the exterior materials before the city sees the application.

Trusted Brands We Service in Roseville

We work steadily with James Hardie, Abodu, and Dvele in Roseville. Hardie Artisan lap siding and vertical panel products show up on most of our custom Roseville ADUs because the HOAs here accept them readily and the material handles Roseville’s dry summer heat without the cracking you see in lesser fiber cement. For prefab and modular ADUs, we coordinate Abodu and Dvele systems through our permit process, matching the factory’s engineering package to Roseville Electric’s load requirements and the HOA’s exterior finish rules.

Common New Detached ADU Problems We See in Roseville Homes

• HOA review filed after the city application. The city won’t accept a detached ADU permit in HOA-governed communities like Woodcreek or Stanford Ranch without the architectural committee’s sign-off. Filing the city application first gets a rejection; sequencing it correctly saves four to six weeks.
• PG&E forms used for Roseville Electric. Contractors who pull permits across Placer and Sacramento Counties often submit PG&E load-calculation or interconnection forms. Roseville Electric rejects those outright. The correction cycle adds three to six weeks to the electrical permit.
• Roof pitch and wall height failing HOA design guidelines. A detached ADU framed at an 8:12 pitch in a neighborhood whose design guidelines call for 6:12 gets a stop-work and a redesign. Most Roseville HOAs specify maximum building height, roof pitch, and exterior materials in their CC&Rs.
• Slab curling in summer heat. Roseville regularly sees 100°F+ stretches. A concrete slab poured without a proper vapor barrier and without controlling moisture loss during curing can curl at the edges. That telegraphs into the framing and the flooring. We pour to a written slab specification and document the cure.

Pricing for New Detached ADU in Roseville, CA

We Also Serve Cities Near Roseville

Our crews serve Roseville and the surrounding communities including Citrus Heights, Orangevale, Rocklin, and Fair Oaks. If your property sits within a few miles of the Roseville city line, the same design-build contract, the same written price guarantee, and the same documented photo record apply. We schedule Roseville work from our Sacramento metro office, but the crews who build your ADU are local to the area and know the Roseville Electric and HOA tracks firsthand.

FAQs - New Detached ADU in Roseville