Why Pomona Homeowners Choose Ellery ADU Studio Pomona for ADU
Since 2015, Ellery ADU Studio has designed, permitted and built more than 900 ADUs across California with a single rule: the price is written before the first wall goes up. Our Pomona branch, led by Nadia Ellery, brings that same standard to the San Gabriel Valley. Homeowners here call us because they’re tired of bids that balloon and designers who disappear once the permit hits a snag.
6 Reasons We’re Pomona’s Top ADU Company
1. We’ve been at this since California’s ADU law actually changed
Ellery started in 2015, the same year Sacramento rewrote the rules and every city in California had to figure out how to process ADU permits from scratch. We’ve lived through every revision since. In Pomona, that means we know how the city’s Planning Department interprets setback rules for corner lots, which neighborhoods trigger historic review, and why a standard garage conversion in Lincoln Park can sail through while an identical plan in Phillips Ranch needs a drainage study. That knowledge only comes from years of working this specific market.
2. Our reputation is visible where homeowners actually look
We don’t ask anyone to trust us blindly. Our three-star reviews get read just as carefully as our five-star ones, and we leave them all up. Homeowners in Montclair, Diamond Bar and Chino Hills have written about the same things: we showed up when we said we would, the permit set was clean enough that the city didn’t bounce it back, and the final invoice matched the written quote. That’s the reputation we’ve built across the San Gabriel Valley.
3. Every pro on your job is required to hold the license and insurance California requires
Under Haven Standard Clause 3, Verified Crews, every contractor working under our name must carry current state licensing and insurance, and we keep those license numbers on file and available to you. We don’t send day laborers or unlicensed handymen to your property. In Pomona, where the Building & Safety Division inspects ADU foundations, electrical and plumbing with particular attention to seismic bracing, that credentialing isn’t optional. It’s the minimum.
4. We know the prefab and panelized brands that actually deliver to this zip code
Not every ADU gets stick-built on site. We’ve worked with Boxabl units for compact backyard placements in West Covina, specified James Hardie siding for fire-resistant exteriors in Chino Hills, and sourced Tuff Shed structures for workshop conversions in Ontario. We also have direct experience with Abodu, Cover and Dvele systems. The difference is knowing which manufacturer’s delivery crane can clear the power lines on a typical Pomona alley, and which ones quote freight without mentioning the offloading fee. We know because we’ve done it here.
5. The price on the page is the price on the permit
Haven Standard Clause 1, Have It In Writing, means you get a flat price, a written scope and a written warranty before anyone starts. No “allowances” that turn into change orders. No “while we’re in here” upsells when the foundation is already open. We break out line items: design and permit set, site prep, foundation, structure, MEP rough and finish, final inspection. If Pomona’s Planning Department asks for a soils report we didn’t anticipate, we eat it. That’s the Clause 1 commitment.
6. We document what we found, not what we felt about it
Haven Standard Clause 4, Evidence on Every Job, means photos and readings of what we actually encountered: the existing sewer lateral depth, the electrical panel capacity, the slope from your back door to the property line. You get that documentation. If a question comes up later about whether the original scope included trenching for a new water line, we have the photo from day one. In a city like Pomona, where older neighborhoods have clay soil, original galvanized plumbing and unpermitted additions from decades past, that evidence protects both of us.
Our Promise to You
If you’re not satisfied with any phase of our work, we stop and fix it before the next phase begins. That’s not a refund promise; it’s a process promise. We don’t pour concrete over a foundation layout you haven’t approved. We don’t frame walls over a plumbing rough-in you haven’t walked. Every phase gets your sign-off, documented in writing, with photos.
Our response commitment is straightforward: when you call (657) 286-7915, a live coordinator answers and connects you with our local team. We don’t promise a technician at your door in 22 minutes because ADU work isn’t an emergency repair. We do promise a real appointment window, a named project manager, and a text when they’re on the way. That’s Haven Standard Clause 2, Arrive on Schedule.
Our pricing transparency commitment is absolute. Clause 1 requires a written line-item quote before work begins. No verbal estimates. No “we’ll figure it out as we go.” The quote includes every permit fee we can identify, every inspection, every material specification. If we miss something, that’s our cost, not yours.
Frequently Asked Questions
Most ADU projects fail at the handoff between designer and builder. We are a design-build studio, not a contractor who subcontracts drawings or a designer who disappears at permit issuance. One contract, one price, one team from site measure to final inspection. Since 2015, we’ve completed more than 900 ADUs under that model. Call (657) 286-7915 to schedule your free estimate and see the difference.
We stop and correct it before proceeding. Haven Standard Clause 4 requires documented evidence at every phase, and your written sign-off before we move to the next. No phase is buried behind a phase you can’t inspect. If something doesn’t match the drawings or the written scope, we fix it at our cost. Call (657) 286-7915 to discuss your specific concerns - estimates are free.
No. Our initial site visit and written estimate are free. During that visit, we measure your property, photograph existing conditions, check setback and utility locations, and identify any Pomona-specific requirements like hillside grading or historic district review. You receive a written line-item quote, not a verbal ballpark. Call (657) 286-7915 to schedule yours.
Every professional working under our name is required to hold the California state license and insurance their trade requires, per Haven Standard Clause 3. We keep those license numbers on file and provide them on request. We also pull all required permits and schedule all inspections with the City of Pomona Building & Safety Division. Call (657) 286-7915 to verify our current standing.
We schedule site visits by appointment, not by emergency dispatch. When you call (657) 286-7915, a live coordinator will offer available windows, typically within one to two weeks depending on current project load. You’ll get a named project manager, a confirmed date and time, and a text when they’re en route. That’s Haven Standard Clause 2. ADUs take months to permit and build; the first meeting should set that careful tone.
Written by Nadia Ellery, Owner at Ellery ADU Studio Pomona, serving Pomona, Montclair, San Dimas, Diamond Bar, Upland, Covina, Glendora, Chino, Chino Hills, West Covina, Ontario and Rowland Heights.