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

Fast, Reliable New Detached ADU Across Chino

A new detached ADU in Chino typically costs $220,000-$420,000 all-in, from permit-ready drawings through final inspection, and most projects clear plan check in 90-120 days when the submittal package is complete. We’re Ellery ADU Studio, and our New Detached ADU team coordinates every step from our Inland Empire office, with crews serving Chino neighborhoods from The Preserve to older tracts off Central Avenue. Call (840) 212-3065 to schedule your free estimate. Every project gets a written price before any work starts, per Haven Standard Clause 1.

Call (840) 212-3065

Why Ellery ADU Studio Upland Is Chino’s Preferred New Detached ADU Company

We’ve designed, permitted, and built ADUs across Chino since 2015, the year California’s ADU laws began their major shift. That timing matters. We learned the local landscape as it was forming, not after the fact.

Our Chino clients receive the same documentation we demand for ourselves: a permit set treated as the core product, not an afterthought; a written price locked at signing; and a photo record from every site visit showing what we found, not what we felt. Under Haven Standard Clause 5 (No Surprises), the scope is fixed. No door-side upsells, no scope creep.

Dispatch and scheduling run from our Inland Empire office, with crews local to Chino. Response to initial inquiries is same-day during business hours. A live person answers calls 24/7.

Nadia Ellery, our founder, reviews every Chino project’s permit set before submittal. That’s not a figurehead claim. It’s the check that caught a setback variance miscalculation on a Central Avenue project last year, saving the client six weeks of revision cycles.

Our New Detached ADU Services in Chino

Custom Built ADU

Custom built ADUs in Chino run $280,000-$420,000 all-in, depending on square footage, finish level, and site conditions. On older Chino lots - the 1970s-1990s ranch homes built on former dairy parcels - we regularly design around existing concrete pads and oversized accessory structures that predate current codes. In newer 2000s tracts like The Preserve or north Chino developments off Pine Avenue, the constraint flips: the architectural committee and builder warranty language drive the design, not the lot size. We match roof pitch, stucco texture, and exterior finish to the primary home’s spec, then document the compliance package so the HOA signs off on first submittal. Every custom project includes full permit set, structural calculations, and our 365-Day Done Right Promise in writing.

Prefab ADU Installation

Prefab ADU installation in Chino typically ranges $220,000-$340,000, including site prep, foundation, utility trenching, and finish-out. We specify and coordinate systems from Abodu, Cover, and Dvele, integrating them under the same single contract that covers our custom builds. The advantage for Chino’s hotter inland climate: factory-built envelopes with tight air sealing and pre-engineered mechanical packages that don’t fail when west-facing walls hit 112°F in July. On a recent project near Chino Avenue, we specified an Abodu unit with upgraded mini-split capacity and supplemental ceiling fans after calculating the solar heat gain from the client’s unshaded rear yard. Prefab doesn’t mean off-the-rack. It means the shell arrives precision-built; we still handle Chino’s soil conditions, HOA architectural match, and warranty setback compliance on site.

Modular ADU

Modular ADUs in Chino fall in the $240,000-$360,000 range, siting a factory-built module on a permanent foundation with full utility connections. Modular construction differs from prefab in its structural certification: modules are built to IRC Appendix Q or equivalent, then crane-set and finished. For Chino’s newer master-planned communities, this matters because the architectural committee reviews the exterior finish specification before the module is ordered. We coordinate with the factory on James Hardie siding colors, roof tile profiles, and stucco matches so the submittal package arrives complete. The 365-Day Done Right Promise applies identically: if the finished ADU deviates from the permitted drawings, we make it right.

Studio ADU

Studio ADUs in Chino - 300-450 square feet, kitchenette and full bath - typically run $220,000-$300,000. These are the most common first ADU for Chino homeowners testing the rental market or creating guest space. On a standard 6,000 sq ft lot in a 2000s north Chino tract, a studio ADU fits within rear setback requirements while preserving the backyard the HOA expects maintained. We spec dual-zone mini-splits as standard, not optional. Chino’s 105°F+ afternoons and sharp diurnal temperature swings make single-zone or window units a false economy. Two years after move-in, owners with undersized mechanicals are replacing them anyway. We size for the climate the first time.

1-Bed & 2-Bed ADU

One-bedroom detached ADUs in Chino range $260,000-$360,000; two-bedroom units run $320,000-$420,000. The jump from studio to 1-bed is mostly plumbing and partition walls; the jump to 2-bed adds square footage, second bathroom, and often a larger electrical service upgrade. On Chino’s older dairy-parcel lots with 8,000-12,000+ sq ft, we regularly design 2-bed ADUs with dedicated parking pads and private entries that function as standalone rentals. In newer tracts, the same square footage requires careful setback verification against the builder warranty’s 3-foot foundation exclusion zone. We pull the warranty language and map the safe build zone before we draw a single line.

Trusted Brands We Service in Chino

We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie, all within the same single-contract model that eliminates designer-builder blame gaps. For Chino’s climate, we frequently default to James Hardie siding over 2×6 framing for its thermal stability and moisture resistance during inland valley heat spikes. Local material coordination means we’re not waiting on specialty orders from out of region when a Chino project’s schedule has permit approval in hand.

Common New Detached ADU Problems We See in Chino Homes

• Builder warranty voided by foundation proximity. Newer Chino tracts carry warranties that lapse for any excavation within 3 feet of the primary foundation. We’ve seen owners lose coverage after trenching for ADU utilities without reviewing the warranty’s exclusion language first. We pull the document and map the safe zone before breaking ground.
• Undersized HVAC in west- and south-facing ADUs. Chino’s inland heat and solar exposure on rear-yard structures make single-zone mini-splits inadequate. We spec dual-zone systems with filtration upgrades as standard; the alternative is an uninhabitable unit by August and a callback we don’t want.
• HOA architectural rejection on first submittal. In 2000s master-planned Chino communities, the architectural committee reviews roof pitch, stucco match, and exterior finish before the city ever sees the ADU plan. Submitting to the city first is backwards. We sequence HOA approval, then city permit.
• Buried dairy-era infrastructure on pre-1990 lots. Excavation in older Chino regularly hits concrete milk house slabs, well casings, or undocumented underground storage. A City of Chino stop-work order and county environmental review can add weeks. We budget a preliminary soil and records assessment for any pre-1990 property.

Pricing for New Detached ADU in Chino, CA

We Also Serve Cities Near Chino

Our crews work throughout the western Inland Empire, including Chino Hills, Corona, Ontario, and Montclair. Each city’s permit environment and housing stock differ, and we adjust our submittal packages accordingly. Chino Hills enforces stricter hillside grading; Ontario has its own utility coordination timeline. The same single-contract, written-price model applies everywhere we build.

FAQs - New Detached ADU in Chino