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

Fast, Reliable New Detached ADU Across Eastvale

A new detached ADU in Eastvale typically costs $220,000-$380,000 all-in, from permit set through final inspection, and the fastest path means filing your HOA architectural packet and City of Eastvale permit in the same week - not one after the other. We’re the New Detached ADU team at Ellery ADU Studio San Bernardino, and we coordinate both tracks so your backyard never sits as a half-framed shell waiting on a committee. Our crews serve Eastvale from our Inland Empire office, and a live person answers calls at (909) 359-6463 - no voicemail queue, no callback that doesn’t materialize.

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Why Ellery ADU Studio San Bernardino Is Eastvale’s Preferred New Detached ADU Company

We’ve designed, permitted, and built 900+ ADUs since 2015, the year California’s ADU laws shifted. Eastvale’s uniform 2000s-2010s stucco tract homes on flat, generous lots make the city one of the strongest detached-ADU markets in Riverside County - but nearly every subdivision is HOA-governed, creating a dual-approval gauntlet that stalls projects by months when not managed upfront. We know the difference between a River Heights HOA palette and a Cypress Heights palette. Our clients in Eastvale receive a written price before any work starts, per Haven Standard Clause 1, and a documented photo record on every visit. We don’t do “call for a quote.” We do written line-item pricing, signed, before the first shovel hits dirt.

Response time to Eastvale is same-day for initial consultations, and our field teams are already working in the city most weeks. The license number appears on every page - verified, not just claimed. Background-checked, uniformed crews. One contract, one written price, no designer-versus-builder blame gap.

Our New Detached ADU Services in Eastvale

Custom Built ADU

Custom built ADUs in Eastvale typically run $260,000-$380,000 all-in, drawings through final inspection. These are stick-framed, site-built structures designed to your lot’s exact dimensions and your HOA’s architectural guidelines. On a 9,200 sq ft lot off Citrus Grove Drive near River Heights, our crew built an 850 sq ft detached ADU with a 2-bed/1-bath layout, James Hardie siding in a warm grey to match the HOA palette, and a dual-zone mini-split sized for 110°F afternoons. We filed the HOA architectural packet and the City of Eastvale permit the same week. Because both were front-loaded, the backyard never sat as a slab-and-framing shell waiting on a committee - we closed the job in one continuous sequence with no mid-build stall. That’s the difference between a contractor who pulls permits and a design-build studio that coordinates the full calendar.

Prefab ADU Installation

Prefab ADU installation in Eastvale typically runs $220,000-$320,000 all-in. We specify and coordinate systems from brands including Dvele, Mighty Buildings, and Plant Prefab - all within the same single contract that covers design, permitting, and installation. The flat, previously agricultural lots in Eastvale mean crane access is usually straightforward, and the generous setbacks common in 7,000-10,000+ sq ft parcels simplify module placement. But the HOA architectural review still applies: even a factory-built unit needs color, roofline, and foundation approval before it reaches your backyard. We handle that submittal, not you.

Modular ADU

Modular ADUs in Eastvale typically cost $240,000-$350,000 all-in. These are code-compliant modules built off-site to California Building Standards, then set and finished on your foundation. Eastvale’s uniform stucco tract aesthetic means modular units often need exterior finish customization to pass HOA review - we specify James Hardie siding or matching stucco systems during the design phase, not as a change order after the module arrives. The dual-track filing approach applies here too: HOA packet and city permit, same week, both front-loaded.

Studio ADU & 1-Bed & 2-Bed ADU

Studio ADUs in Eastvale typically run $220,000-$280,000; 1-bed units $240,000-$320,000; 2-bed units $260,000-$380,000. The 2-bed layout is what we built on Citrus Grove Drive - 850 sq ft, full kitchen, independent HVAC, its own electric meter. Eastvale’s large rear yards routinely accommodate 800-1,200 sq ft detached ADUs without triggering lot-coverage limits, so the square-footage decision is usually driven by rental income goals and HOA aesthetic constraints, not by what fits. We model both scenarios in the written quote.

Trusted Brands We Service in Eastvale

We specify and coordinate prefab and modular systems from Dvele, Mighty Buildings, Boxabl, Plant Prefab, and others - all within our single-contract design-build model. For Eastvale’s 105-110°F valley summers, we size every system with independently specified mini-split HVAC, since tapping the primary home’s existing equipment fails Title 24 inspection here. James Hardie siding is our default recommendation for HOA-governed Eastvale tracts: it matches the stucco-and-trim palette common to 2000s-2010s construction, carries a 30-year warranty, and comes in colors that pass architectural review on first submittal. We don’t guess at what your HOA wants. We pull their design guidelines, match the palette, and document the selection in your permit set before filing.

Common New Detached ADU Problems We See in Eastvale Homes

• The HOA sequencing trap. Filing the City of Eastvale permit first and only then discovering the HOA’s 30-60 day architectural review window - pushing the schedule out months after clients thought they had cleared approval. We file both packets the same week, running parallel tracks.
• Style mismatches that trigger redesign loops. Proposing a detached ADU style, color, or height that clashes with Eastvale’s uniform stucco tract palette draws an HOA denial instead of first-pass approval. We pull the guidelines upfront and spec accordingly.
• HVAC non-compliance on Title 24. Designing the ADU to tap the primary home’s existing equipment fails inspection in Eastvale’s 105-110°F valley climate. Every detached ADU we permit carries its own independently sized mini-split system.
• Long sewer laterals on former dairy land. Eastvale’s utility stub-outs often run long distances to the street on these flat, previously agricultural parcels. We survey the lateral length during site prep and price it in the original quote - no change order when the trench goes deeper than expected.

Pricing for New Detached ADU in Eastvale, CA

We Also Serve Cities Near Eastvale

Our crews work throughout the Inland Empire, including Eastvale, San Bernardino, Rialto, Colton, and Grand Terrace. Dispatch and scheduling are coordinated from our Riverside-San Bernardino office. The same dual-track filing expertise, the same written-price guarantee, the same 365-Day Done Right Promise applies in every city we serve.

FAQs - New Detached ADU in Eastvale