ADU Design & Permitting Near Me in Chino Hills - One Fixed Price, Permits Handled

ADU Design & Permitting Near You in Chino Hills, CA

If you’re searching for our ADU Design & Permitting services near Chino Hills, Ellery ADU Studio works directly in the area – covering Chino Hills and surrounding cities including Chino, Yorba Linda, Diamond Bar, and Eastvale under one written contract from drawings through final inspection. Every project starts with a written price before any work begins, per Haven Standard Clause 1, so you know the number before you commit to anything. Call (951) 456-4467 to speak with a live person now – no voicemail, no callback queue.

Homeowners across Chino Hills are converting garages, adding detached units in their backyards, and building Junior ADUs inside existing square footage – often to house aging parents, generate rental income, or simply add long-term value to a property they bought at a price that deserves a serious return. Nadia Ellery founded this studio in 2015, the same year California began reshaping its ADU permitting rules in ways that made these projects far more viable. Since then, Ellery ADU Studio has designed, permitted, and built more than 900 ADUs, every one with a documented photo record and a written warranty backing the finished work.

This page is for homeowners who already know they want an ADU and are trying to figure out who to call first. The short answer: call the studio that puts the price in writing before the design starts, covers the permit set under the same contract as construction, and stands behind the result for 365 days.

Fast, Local ADU Design & Permitting

When you call (951) 456-4467, a live person picks up – any time of day. We schedule site visits for Chino Hills properties quickly, and because design, permitting, and construction live under a single contract, there’s no hand-off delay between the team that draws the plans and the team that pulls the permit. That gap – the one where most ADU projects stall – doesn’t exist here.

Chino Hills sits at the intersection of San Bernardino, Los Angeles, and Orange counties, which means some properties here deal with jurisdictional questions that a less local studio would take weeks to untangle. We know the City of Chino Hills Building and Safety Division’s current ADU checklist, the setback rules that apply to lots backing Carbon Canyon Road, and the utility coordination requirements that come up regularly in Carbon Canyon and Butterfield Ranch. That local knowledge is baked into the permit set, including HOA & Zoning Compliance considerations, not learned at your expense mid-project.

Our ADU Design & Permitting in Chino Hills service covers the full scope: site analysis, architectural drawings, structural calculations, Title 24 energy compliance, and the complete permit submittal package. Construction follows under the same written price. No separate contractor. No designer-versus-builder blame gap if something doesn’t match the approved drawings.

Areas We Cover

Ellery ADU Studio serves homeowners throughout the Chino Hills area and the cities closest to it. If your property is in Chino Hills, Chino, Yorba Linda, Diamond Bar, Pomona, Eastvale, Montclair, or Anaheim, you’re in our core coverage zone. We regularly visit sites across all of these communities, and the written price we provide reflects the actual local conditions – permit fees, utility tie-in costs, and site prep requirements – for each city specifically.

Chino Hills homeowners in Butterfield Ranch, Woodview, Los Serranos, and along Peyton Drive have each come with their own site quirks: slope setbacks, shared utility easements, and in some cases lots that abut unincorporated San Bernardino County land. We document what we find on the site visit and tell you plainly what it means for your budget line items. That’s the approach described on our home page, and it’s how every project here runs.

• Chino Hills, CA – primary service area; full design-build scope available
• Chino, CA – frequently served; familiar with Chino’s ADU fee schedule and setback standards
• Yorba Linda, CA – Orange County ADU rules apply; we handle the jurisdictional paperwork
• Diamond Bar, CA – hillside lots with slope considerations; site analysis included
• Pomona, CA – active permitting relationships with Pomona Building & Safety
• Eastvale, CA – newer city with evolving ADU standards; we track the current requirements
• Montclair, CA – compact lots common here; Junior ADU and garage conversion options available
• Anaheim, CA – Orange County jurisdiction; Title 24 and fire code requirements coordinated

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What ADU Design & Permitting Typically Costs Near Chino Hills

Design and permitting costs vary by ADU type, lot complexity, and what the city charges for plan check and permit fees. The ranges below reflect current Chino Hills-area market conditions and include everything in the design and permitting phase: architectural drawings, structural engineering, Title 24 compliance, and the complete permit submittal. City fees are passed through at cost – no markup.

Every number above is paired with a written quote before any work starts – Haven Standard Clause 1. The ranges are honest estimates based on Chino Hills conditions. Your written price may land anywhere in those ranges, or outside them, depending on what the site visit finds. What it will never be is a surprise after construction begins.

Chino Hills city permit fees for ADUs currently run in the $8,000-$15,000 range depending on square footage and whether the project triggers school fees (projects over 500 sq ft typically do under current San Bernardino County Unified School District schedules). We include those fee projections in the written quote.

What the Permit Set Actually Includes

A lot of homeowners don’t realize what a complete Permit Application requires until they’ve paid a designer for drawings that the city kicks back at plan check. A permit submittal for a Chino Hills ADU typically needs:

• Site plan showing property lines, existing structures, proposed ADU footprint, setbacks, and utility connections
• Architectural floor plans and elevations (existing and proposed)
• Structural drawings and calculations, wet-stamped by a licensed structural engineer
• Title 24 energy compliance report (California’s mandatory energy code documentation)
• Grading and drainage plan if the lot has slope or if the project disturbs more than a de minimis area
• Electrical, mechanical, and plumbing plans coordinated with the architectural set
• Fire sprinkler documentation if required by the City of Chino Hills (detached ADUs over 1,200 sq ft or certain hillside conditions)

At Ellery ADU Studio, all of that is inside the single contract. The structural engineer, the Title 24 consultant, and the permit expediter are coordinated by us, not subcontracted to someone you’ve never met and can’t hold accountable. Nadia Ellery reviews every permit set before it goes to the city.

Prefab and Modular Options for Chino Hills Homeowners

If you’re considering a prefab or modular ADU – brands like Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, or a Tuff Shed-based structure finished with James Hardie siding – Ellery ADU Studio specifies and coordinates these systems within the same single contract. Prefab doesn’t mean no permit: every factory-built ADU placed in Chino Hills still requires a local foundation permit, utility connections, and a final inspection by the city. We handle that documentation and site coordination as part of the written scope.

Prefab timelines in Chino Hills vary considerably depending on the manufacturer’s current production schedule and the city’s plan check queue – which, as of early 2026, has been running four to eight weeks for first submittals. We track current wait times and factor them into the project schedule we give you in writing before work starts.

The 365-Day Done Right Promise

When construction is complete, the project doesn’t close until the finished ADU matches the permitted drawings. If it doesn’t, we make it right – in writing, before the project starts, not as a verbal reassurance after something goes wrong. That’s the 365-Day Done Right Promise, and it applies to every project Ellery ADU Studio builds in Chino Hills and the surrounding area.

We also provide a documented photo record at every site visit: what was found, what was done, and what the next step is. You receive the record directly. “The crew was out there” is not a documentation standard – a timestamped photo set is.

Free Second Opinion on Any Written Estimate

If you already have a written estimate from another ADU designer or contractor in the Chino Hills area, bring it to us. We’ll review the scope line by line and tell you what’s included, what’s missing, and whether the number reflects current local conditions. There’s no charge for that review. It’s a direct, practical way to find out whether the proposal in your hand is complete before you sign anything.

FAQs: ADU Design & Permitting Near Chino Hills

How fast can you start on an ADU design project in Chino Hills?

We typically schedule an initial Site Assessment within a few business days of your first call. The design process itself, from site visit to completed permit-ready drawings, runs eight to fourteen weeks depending on the ADU type and how quickly your responses come back on design decisions. City of Chino Hills plan check adds time on top of that – first submittals have been taking four to eight weeks in 2025 and into 2026. We give you a written project schedule before work starts so you know what to expect at each stage. Call (951) 456-4467 to get a site visit on the calendar.

Do you serve my area if I’m not in Chino Hills proper?

Yes. Our core coverage area includes Chino Hills, Chino, Yorba Linda, Diamond Bar, Pomona, Eastvale, Montclair, and Anaheim. If your property is in one of those cities, you’re in our regular service area and the full design-build scope is available to you. If you’re somewhere adjacent that isn’t on that list, call (951) 456-4467 and we’ll tell you directly whether we can take the project.

How much does ADU design and permitting cost near Chino Hills?

Design and permitting for a Chino Hills ADU typically runs $8,000 to $28,000 depending on ADU type, square footage, and lot complexity – not including city permit fees, which add roughly $8,000 to $15,000 for most projects. The all-in build price, drawings through certificate of occupancy, runs $65,000 to $420,000 depending on scope. Every project gets a written price before any work starts, per Haven Standard Clause 1 – so the number you agree to is the number you pay, absent a change in your written scope. Call (951) 456-4467 for a site-specific written quote.

Can I reach someone after hours if I have questions about my ADU project?

A live person answers calls at (951) 456-4467 any time – no voicemail, no callback queue. After-hours calls are typically for project status questions, urgent site issues during construction, or homeowners who work during the day and can only talk in the evening. Whatever the reason, someone picks up.

Key Takeaways

• Ellery ADU Studio serves Chino Hills and nearby cities including Chino, Yorba Linda, Diamond Bar, Pomona, Eastvale, Montclair, and Anaheim.
• Design, permitting, and construction are covered under one written contract at one written price – no designer-versus-builder gap.
• Every project starts with a written price before any work begins (Haven Standard Clause 1).
• Design and permit phase costs run $8,000-$28,000; all-in build costs run $65,000-$420,000, depending on ADU type and scope.
• The 365-Day Done Right Promise backs every finished project in writing.
• Free Second Opinion available on any written estimate you already have.
• A live person answers (951) 456-4467 any time of day.
• Nadia Ellery reviews every permit set before it goes to the City of Chino Hills.

Ready to Start? Call Ellery ADU Studio Chino Hills

If you’re ready to talk through an ADU project in Chino Hills, or you want a second opinion on an estimate you’ve already received, call (951) 456-4467. A live person picks up. We’ll schedule a site visit, document what we find, and give you a written price before any work begins. No vague ranges delivered verbally, no scope that shifts after you’ve signed. Just a specific number, in writing, backed by the Haven Standard and the 365-Day Done Right Promise.

Ellery ADU Studio has been doing this since 2015. The permit set is the core product here – not an afterthought handed off to a separate contractor. That’s the difference, and it’s documented from the first site visit to the final inspection.

Written by Nadia Ellery, Owner at Ellery ADU Studio Chino Hills, serving Chino Hills and nearby areas.