The Ellery ADU Studio Chino Hills Guarantee
We stand behind every ADU we design, permit, and build in Chino Hills with something most contractors treat as optional: a written promise signed before the first shovel hits dirt. Since 2015, we’ve delivered 900+ ADUs across Southern California, and every single one started with a fixed written price and ended with a documented photo record of what was built. In Chino Hills specifically, we know the gap between a Monday morning at the permit counter and a Thursday afternoon revision request. That unpredictability is exactly why we lock our scope, our pricing, and our accountability in writing under The Haven Standard. You get the permitted drawings, the built reality, and a 365-Day Done Right Promise that bridges the two. If what we hand you doesn’t match what we promised, we make it right. Not eventually. Not after a dispute. Right.
What’s Covered
- Workmanship that matches the permitted set. Our 365-Day Done Right Promise means if the finished ADU in Chino Hills deviates from the approved drawings or specifications we signed off on, Ellery ADU Studio corrects it at our expense. This is not a “satisfaction” loophole where we debate whether you should be happy; it’s a concrete standard tied to the permit set you already approved.
- Parts and materials specified, not substituted. When we quote a James Hardie siding package, an Abodu module, or a Tuff Shed structure, that’s what arrives on your Chino Hills property. Under Haven Standard Clause 5 (No Surprises), substitutions require your written approval and a change order with pricing. No door-side swaps, no “this is just as good” conversations after delivery.
- Site condition documented, not described. Every visit to your Chino Hills property generates a photo record you receive directly. Foundation condition, utility tie-in points, existing slab thickness, setback measurements - we show you what we found, not what we felt about it. When the inspector asks why we routed the sewer line a certain way, you have the same evidence we do.
- Scheduling with accountability. We don’t promise what we can’t control. Chino Hills Planning and Building & Safety has its own timeline, and we build realistic city review periods into every schedule we present. What we do guarantee is that we hit our own milestones: drawings delivered by the date in the contract, site prep started within the window specified, inspections requested within 48 hours of readiness. If we miss our own commitment, we document why and adjust at no additional project management cost.
- Honest pricing locked at signing. Haven Standard Clause 1 requires a written price before any work starts. For a garage conversion ADU in Chino Hills, that typically runs $85,000-$140,000 all-in, drawings through final inspection. For a new detached ADU, $150,000-$280,000 depending on size, utility distance, and finish level. For a junior ADU or interior conversion, $45,000-$95,000. These ranges are what we use to start the conversation; your written quote is specific to your property, your soil conditions, your utility locations. The words “call for a quote” do not appear anywhere in our process because they shouldn’t appear anywhere in yours.
Our Satisfaction Promise
If you’re not satisfied with the finished ADU in Chino Hills, here’s what happens. First, you tell us specifically what doesn’t match the permitted drawings or the written scope. Second, we walk the property with you within five business days, photo record in hand, and identify whether it’s a workmanship issue, a materials deviation, or a documentation gap. Third, if it’s our responsibility under the 365-Day Done Right Promise, we schedule correction work with a fixed completion date and a written scope for that correction. No charge. No negotiation about whose fault it was. The promise is in writing before your project starts, so there’s nothing to argue about after.
We’ve had to invoke this exactly three times in 900+ projects. Two were slab settlement issues in Chino Hills’ hillside zones where the geotechnical report missed a soft pocket; we re-poured and re-inspected at our cost. One was a window spec mismatch on a Cover module installation where the factory updated their standard hardware mid-production; we swapped the units and absorbed the freight. In each case, the homeowner had their written scope, their photo record, and their correction timeline within a week of raising the issue. That’s the standard we apply in Chino Hills because it’s the only standard that holds up when something actually goes wrong.
Before
AfterLicensed & Insured Backing
The 365-Day Done Right Promise and Haven Standard clauses are only as solid as the business behind them. Ellery ADU Studio Chino Hills is licensed and insured, with coverage that extends through design, permitting, construction, and final inspection. Our license number appears on every page of our site and every contract we sign, verified through the California Contractors State License Board, not just claimed in fine print.
Insurance matters in Chino Hills specifically because ADU work crosses multiple trades: foundation, framing, electrical, plumbing, sometimes hillside grading with geotechnical oversight. A designer without builder’s insurance can’t cover jobsite injury. A builder without professional liability can’t cover a design error that makes it through permitting. Our one-contract design-build model means one policy stack covers the full chain, from the first site survey to the final certificate of occupancy. If something goes wrong, you’re not coordinating between a designer’s insurer and a builder’s insurer while each points at the other. You call one number: (951) 456-4467. A live person answers, 24 hours a day. No voicemail queue, no callback that doesn’t materialize.
We’ve been in business since 2015. We’ve seen Chino Hills update its ADU ordinance twice, watched San Bernardino County’s fire setback requirements shift, and tracked how the city’s Planning Commission interprets state density bonus law in practice. That longevity isn’t a marketing angle; it’s the practical backing that lets us honor a written promise a year after we made it. A guarantee from a business that won’t be around in twelve months is just words on paper. Our words are backed by 900+ completed projects, a documented photo record for every one, and Nadia Ellery’s signature on your contract.
Free Second Opinion on Any Written Estimate
If you already have a written estimate for an ADU project in Chino Hills from another contractor, we’ll review it against the same standards we apply to our own quotes. We look for missing permit fees, undefined utility tie-in costs, placeholder allowances that always seem to run over, and scope gaps that turn into change orders. There’s no obligation to hire us. The point is that you understand what you’re actually buying before you sign. Bring us the paper; we’ll tell you what we see.
Call (951) 456-4467 to schedule your free estimate or second opinion review. Estimates are always written, always fixed, and always delivered before any work starts. That’s Haven Standard Clause 1. It’s not a preference. It’s the rule.
Written by Nadia Ellery, Owner at Ellery ADU Studio Chino Hills, serving Chino Hills since 2015.