What Ontario Homeowners Say About Ellery ADU Studio Ontario
We’ve been designing and building ADUs in Ontario since 2015, and the feedback we value most comes from homeowners who’ve lived through the full process - from first sketch to final inspection. These reviews aren’t curated for marketing; they’re the specific details people mention when we ask what mattered to them. The written price upfront. The photo record showing what happened each day. The 365-Day Done Right Promise in actual writing, not a handshake. In a city where permit timelines can stretch and foundation surprises lurk under old garages, specificity is what separates a useful review from noise.
Recent Reviews
“We’d already been quoted $14,000 for ‘design and permitting’ by another firm with no construction price locked in. Nadia’s team gave us one written number for the whole garage conversion - $127,000 from drawings through final inspection, including the 4-inch slab upgrade we needed because the existing concrete was too thin for residential code. The photo record from every visit let my husband check progress from his office in Rancho Cucamonga. We moved our daughter in last March.”
- Farah K., Ontario Ranch
“Our lot in Downtown Ontario is only 5,200 square feet, so we assumed a detached ADU was impossible. Nadia walked the setback variance - the extra distance the city requires between the new unit and the property line - and found we could fit a 420-square-foot studio by shifting the footprint three feet west, away from the alley. The permit set included the variance application; we didn’t hire a separate architect. One contract, one written price: $198,000. Done in 11 months from signing.”
- Maria S., Downtown Ontario
“I had a written estimate from a general contractor for $89,000 to convert my garage, but the scope was vague - ‘electrical as needed,’ ‘flooring allowance.’ Ellery’s Free Second Opinion broke it down line by line: subpanel upgrade $4,200, fire-rated drywall assembly $6,800, mini-split HVAC $3,400. Their total came in higher at $118,000, but every item was specified with a product name and model. I went with them because I finally understood what I was paying for. The 365-Day Done Right Promise was in the contract, paragraph two.”
- Rafael M., Ontario Mills area
“We wanted a Junior ADU inside our existing 1,800-square-foot home in Ontario’s Colonies neighborhood - a separate entrance, kitchenette, and full bath for my mother. Nadia’s team found the joists in the 1987 addition were 2x8s at 24 inches on center, not the 16 inches modern code wants for the tile floor we planned. The written price included sistering every third joist before the tile went down. No surprise, no change order. The photo record showed the sistering work; my mother framed the picture of the new joists next to her kitchenette.”
- Marisol M., The Colonies, Ontario
“I called three places about a prefab ADU before finding Ellery. Two couldn’t tell me if they worked with Mighty Buildings; one said ‘we can figure it out.’ Nadia’s team had already coordinated two Mighty Buildings units in Ontario, including the crane access requirements for a lot with the same 60-foot alley width as mine. The single contract covered their factory drawings, our foundation and utility trench, and the install day. Written price: $267,000 for a 540-square-foot one-bedroom. The photo record included the crane lift - my neighbor still asks to see it.”
- Farah K., Ontario Ranch
“After my husband passed, I needed income from the property but couldn’t manage a construction project with multiple vendors. Nadia handled everything: the Junior ADU design that kept my existing bedroom count for resale value, the Ontario permit application, the utility tie-ins to the existing sewer lateral. The Haven Standard Clause 1 written price was $94,000. When the inspector flagged a missing egress window dimension on the permit set, Ellery revised and resubmitted at no charge - already covered under the original scope. I didn’t write a second check until it was done right.”
- Maria S., Downtown Ontario
Why Customers Trust Us
The patterns in these reviews match what we built the Haven Standard to address. Homeowners in Ontario don’t complain about the finished ADU; they complain about not knowing the price, not seeing the work, and not having recourse when something drifts. We’ve eliminated those complaints by contract, not by charm.
Every project starts with a written price before any work begins - Haven Standard Clause 1. Every site visit produces a documented photo record, so you’re not interpreting a verbal summary. The 365-Day Done Right Promise means if the finished ADU doesn’t match the permitted drawings, we make it right - in writing, before your project starts, not as a post-problem negotiation. Our crews are background-checked, uniformed, and their license number appears on every page of our documentation. We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie - all under the same single contract, so the designer and builder are the same entity with the same accountability.
A live person answers calls 24/7 at (951) 577-3472. If you already have a written estimate in hand, we’ll give you a Free Second Opinion with line-item breakdowns so you can compare scope to scope, not vague total to vague total. Call (951) 577-3472 to schedule your free estimate.
Written by Nadia Ellery, Owner at Ellery ADU Studio Ontario, serving Ontario since 2015.