Trusted New Detached ADU for Chino Homeowners
A new detached ADU in Chino typically costs $220,000-$450,000 all-in, from permit-ready drawings through final inspection, depending on size, finish level, and whether you build custom or install a prefab unit. See our New Detached ADU cost guide for detailed breakdowns. Ellery ADU Studio has designed, permitted, and built over 900 ADUs since 2015, the year California’s ADU laws began their major shift. Every project starts with a written price before any work begins, per Haven Standard Clause 1. Call (909) 323-1107 to schedule your free estimate.
Chino’s lot sizes, established in the agricultural era and now subdivided into suburban parcels, create specific constraints for detached ADUs. Setback rules differ between the older neighborhoods south of the 60 freeway and the newer developments north toward Ontario Ranch. We’ve worked both sides of the city and know where the city planning department typically requests a variance and where the standard rules apply without modification. For a local example, see our New Detached ADU - Chino project overview. Our permit sets account for Chino’s specific soil conditions, which range from sandy loam in the southwestern quadrant to denser clay-heavy soils east of Central Avenue that affect foundation design and utility trenching.
What Our New Detached ADU Service Includes
Custom Built ADU
A custom built ADU is designed from foundation to roof to match your property’s specific dimensions, your aesthetic preferences, and Chino’s municipal code requirements. You need this approach when your lot has irregular setbacks, significant grade changes, or when you want finishes and layouts that prefab systems don’t offer. At Ellery ADU Studio Chino, we produce the full permit set in-house, coordinate structural engineering for Chino’s seismic zone, and build through our own crews so the drawings and the construction are a single contract at a single written price. No designer-builder blame gap, no change orders when the builder says the drawings don’t work.
Prefab ADU Installation
Prefab ADU installation brings a factory-built module to your Chino property, craned into place and finished on-site. This route makes sense when speed matters, when your lot configuration fits standard module dimensions, or when you want predictable pricing with fewer variables. We specify and coordinate prefab systems from Mighty Buildings, Plant Prefab, and other manufacturers within the same single contract, handling Chino’s permit requirements, foundation prep, utility connections, and final inspection. The Haven Standard applies identically: written price before work starts, documented photo record on every visit, 365-Day Done Right Promise.
Modular ADU
Modular ADUs are built to the California Building Code in factory conditions, then transported in sections and assembled on your foundation. The distinction from prefab matters for financing and appraisal, modular units often qualify for conventional construction loans where site-built alternatives don’t. We work with modular brands including Boxabl and Dvele, managing the state-certified factory inspection process, Chino’s local permitting, and the crane logistics for delivery. Our permit sets include the modular manufacturer’s engineering documents integrated with your site-specific foundation and utility plans, one submission to Chino planning, one approval path.
Studio ADU
A studio ADU is a single-room detached unit, typically 300-450 square feet, with kitchenette and bath contained within the open plan. Chino homeowners choose this format for rental income from compact lots, home office use, or aging-parent proximity without the cost of a multi-room build. We design studio ADUs to maximize natural light given Chino’s south-facing solar orientation patterns, specify efficient mini-split HVAC sized for the volume, and ensure the kitchenette meets California’s ADU-specific code exemptions for smaller cooking facilities. Every studio project receives the same permit-set rigor as a larger build; the documentation doesn’t shrink with the square footage.
1-Bed & 2-Bed ADU
One-bedroom and two-bedroom detached ADUs range from 500 to 1,200 square feet under California’s size limits, which cap ADU floor area at 1,000 square feet for lots under one acre in most Chino zoning districts. You need this category when the unit will serve as a long-term rental, multigenerational housing, or when local rental market data supports higher income from additional bedrooms. Our Chino projects in the 1-bed range typically run 550-750 square feet; 2-bed units cluster at 850-1,000 square feet to maximize allowable area. We model bedroom layouts against Chino’s specific window egress requirements and design closet configurations that satisfy habitability standards without consuming floor area inefficiently.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service for New Detached ADU
We specify and coordinate prefab and modular systems from manufacturers whose products we’ve tested in Chino’s permitting environment. With Mighty Buildings, we’ve completed multiple units where the polymer composite panels required specific fire-rating documentation for Chino’s San Bernardino County fire marshal review; we maintain that documentation package ready for submission. Our Plant Prefab coordination includes their steel-frame system, which performs well in Chino’s expansive soil conditions when paired with our engineered pier foundations. We’ve also integrated Tuff Shed’s Pro Studio line into ADU conversions where the existing structure and foundation could be adapted rather than replaced, saving foundation costs on suitable Chino Hills New Detached ADU lots as well.
Whether your project involves Mighty Buildings, Plant Prefab, Tuff Shed, or any other manufacturer, we evaluate the product against your specific lot conditions, Chino’s code requirements, and your budget before recommending a direction. The evaluation is documented, the recommendation is written, and the price is fixed before any work begins. If you already have a quote from another provider, we offer a Free Second Opinion to review the estimate against what we know about comparable Chino projects.
Before
AfterSigns You Need New Detached ADU Right Now
- Your garage conversion won’t work structurally or financially. Some Chino garages have slab thickness below 4 inches, inadequate for residential conversion without full replacement. Others sit too close to the property line to meet fire separation requirements. A detached ADU sidesteps these constraints entirely, building fresh on a compliant foundation with proper setbacks.
- Rental income from your Chino property would cover the build cost within 6-8 years. At current Chino rental rates, a 1-bedroom detached ADU commands $1,800-$2,400 monthly. If your financing cost and projected rent put payback in that range, delaying means lost income that exceeds any near-term interest savings.
- Family needs are changing within the next 24 months. Aging parents need proximity, adult children need transitional housing, or you need dedicated workspace that a home office remodel can’t provide. Detached ADU construction in Chino typically takes 8-14 months from contract to occupancy; starting now aligns completion with need.
- California’s ADU laws face potential local pushback. Chino has complied with state mandates so far, but inland Empire cities have explored stricter local standards where state law permits flexibility. Building under current rules locks in your entitlement; future restrictions won’t apply retroactively to approved projects.
- Your lot has underutilized space that meets setback and coverage tests. Many Chino lots built in the 1970s-1990s have rear yard depth exceeding minimum requirements by 15-25 feet, enough for a detached unit without sacrificing functional outdoor space. We measure and model this during our free estimate; if the math works, we show you exactly how.
Our New Detached ADU Process - Step by Step
- 1
Site evaluation and feasibility study. We visit your Chino property, measure setbacks from all property lines, photograph existing conditions, and pull preliminary zoning data from San Bernardino County records. You receive a written feasibility summary within 48 hours stating what can be built, what constraints apply, and whether we identify any red flags requiring further investigation.
- 2
Design development and written pricing. Based on your program (bedrooms, budget tier, rental vs. family use), we develop schematic designs and produce a line-item written quote. Haven Standard Clause 1 requires this price before any work begins; it includes every phase from permit set through final inspection, with no provisional allowances or “TBD” line items.
- 3
Permit set preparation and submission. Our in-house designers produce architectural drawings, structural calculations for Chino’s seismic zone, Title 24 energy compliance documentation, and all supporting forms. We submit to Chino’s planning department and track the review cycle, responding to corrections without change orders; permit revision work is included in your fixed price.
- 4
Site prep and foundation. Upon permit issuance, our crews begin utility locates, demolition if needed, excavation, and foundation work. We document every visit with dated photographs uploaded to your project record, showing soil conditions, rebar placement, concrete pours, and any field conditions that required design adaptation.
- 5
Construction, inspection, and completion. We build to the permitted drawings, schedule all Chino building inspections, and coordinate final utility connections. At substantial completion, we conduct a walkthrough with you, document any punch-list items, and activate the 365-Day Done Right Promise: if the finished ADU is not built to the permitted drawings, we make it right, in writing, before the project starts.
How Much Does New Detached ADU Cost in Chino?
A typical custom built detached ADU in Chino runs $220,000-$350,000 all-in, drawings through final inspection, for a 500-750 square foot unit with mid-grade finishes. Prefab and modular installations typically range $180,000-$280,000 for comparable size, with the factory build reducing on-site labor hours but adding transportation and crane costs that vary by Chino neighborhood access. Neighboring Corona New Detached ADU projects show similar logistics patterns. Studio ADUs at the small end, 300-400 square feet, can land at $150,000-$200,000 when site conditions are straightforward. Two-bedroom units at 1,000 square feet with upgraded finishes push toward $400,000-$450,000.
| ADU Type & Size | Typical Range in Chino | Primary Cost Drivers |
|---|---|---|
| Studio ADU (300-450 sq ft) | $150,000-$200,000 | Foundation type, utility distance, finish level |
| 1-Bed Custom (500-650 sq ft) | $220,000-$300,000 | Roof complexity, kitchen spec, HVAC system |
| 1-Bed Prefab/Modular (500-650 sq ft) | $180,000-$260,000 | Manufacturer, transport access, crane requirements |
| 2-Bed Custom (800-1,000 sq ft) | $320,000-$450,000 | Full kitchen, laundry, second bath, upgraded finishes |
| 2-Bed Prefab/Modular (800-1,000 sq ft) | $260,000-$380,000 | Module count, foundation engineering, site prep |
What moves the price within these ranges: soil conditions requiring engineered foundations rather than standard slabs; utility trenching distance from existing sewer and water mains; finish selections for flooring, cabinetry, and fixtures; and whether your Chino lot requires setback variances or other entitlements that extend timeline and professional fees. What’s included in our free estimate: a site visit, preliminary zoning confirmation, schematic design options, and a written line-item quote with no expiration pressure. What avoids overpaying: comparing fixed-price contracts against estimates with open allowances, and verifying that permit costs, impact fees, and utility connection charges are included rather than passed through later. Under Haven Standard Clause 5 (No Surprises), our scope is locked at signing; no door-side upsells, no scope creep.
Call (909) 323-1107 for an exact quote on your specific Chino property. Estimates are free, written, and valid for 30 days.
New Detached ADU Near Chino - Our Service Area
We design and build detached ADUs throughout Chino and surrounding San Bernardino County and western Riverside County communities. Typical projects cluster in Chino proper, Chino Hills, and Eastvale, with additional work in Ontario, Montclair, Pomona, Diamond Bar, Corona, Upland, Anaheim, Rancho Cucamonga, and Fontana. Response time for initial site visits is typically 2-4 business days in Chino and adjacent cities; feasibility summaries follow within 48 hours of the visit. We know the specific planning staff and inspection protocols in San Bernardino County’s Chino office, which reduces permit friction compared to operators who serve the region generically.
Serving Chino, CA - Our Local Coverage Area
We’re based in the Chino area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - New Detached ADU in Chino
A new detached ADU is a standalone residential unit built from the ground up on your property, separate from your main house, with its own foundation, utilities, and entrance. In Chino, detached ADUs are permitted under California state law with local modifications for setbacks, height limits, and parking requirements. Ellery ADU Studio handles the full sequence: feasibility, design, permit set, construction, and final inspection under one contract at one written price.
From signed contract to certificate of occupancy, most Chino detached ADUs take 10-14 months: 3-5 months for design and permitting, 6-9 months for construction. Prefab and modular units can compress the construction phase by 30-60 days if factory scheduling aligns. Timeline extends if your lot requires a setback variance, if soil conditions demand engineered foundations, or if Chino’s planning department experiences review backlogs. We build realistic schedules into our written quotes and update you weekly during active phases. Call (909) 323-1107 to discuss your specific timeline.
Custom detached ADUs in Chino typically range $220,000-$450,000 all-in depending on size and finish level; prefab and modular options generally run $180,000-$380,000 for comparable specifications. Every Ellery ADU Studio quote is written, line-itemed, and fixed before any work begins per Haven Standard Clause 1. We do not provide verbal estimates or ranges that shift once work starts. Call (909) 323-1107 for a free estimate on your property.
Yes. We specify and coordinate Mighty Buildings, Boxabl, Plant Prefab, and other prefab and modular systems within our single-contract model. Our expertise includes integrating manufacturer engineering with Chino’s site-specific requirements for foundation, utility connection, and final inspection. The Haven Standard applies identically: written price, photo documentation, 365-Day Done Right Promise. If you have a quote from a prefab manufacturer, we offer a Free Second Opinion to verify that site costs and finish work are fully accounted for.
Detached ADU construction is planned work, not an emergency service; no legitimate provider can build a ground-up unit same-day or same-week. If you need immediate housing for family members, we can discuss whether a faster path exists through garage conversion or whether our current project pipeline allows expedited scheduling. For true emergencies, Chino’s building department does not offer permit acceleration for ADUs. Call (909) 323-1107 to discuss your timeline honestly.
Every detached ADU is backed by our 365-Day Done Right Promise: if the finished unit is not built to the permitted drawings, we make it right, documented in writing before construction begins. This is Haven Standard Clause 7. Beyond our promise, manufacturer warranties apply to prefab and modular components, and we pass all applicable warranties through to you with registration assistance. We also provide the complete documented photo record from your project for your files.
Gather your property’s Assessor’s Parcel Number (APN), any existing survey or plot plan, and a rough idea of your intended use (rental, family, office) and budget comfort zone. We handle all zoning research, but knowing your goals helps us target the feasibility study. If you have estimates from other providers, bring them for our Free Second Opinion. The estimate visit takes 45-60 minutes; we measure, photograph, and discuss options on-site. Call (909) 323-1107 to schedule.
Schedule Your New Detached ADU Service in Chino Today
Call (909) 323-1107 to schedule your free estimate. A live person answers 24/7, no voicemail queue. You’ll receive a written, line-item quote before any work begins, backed by Haven Standard Clause 1. Nadia Ellery and the team at Ellery ADU Studio Chino have designed, permitted, and built over 900 ADUs since 2015. Every project gets a documented photo record, every promise is written, and the 365-Day Done Right Promise applies from day one.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Chino since 2015.