ADU Design & Permitting Near Me in Pomona - Design, Permits and Build Under One Contract

ADU Design & Permitting Near You in Pomona, CA

If you’re searching for our ADU Design & Permitting services near you in Pomona, Ellery ADU Studio is the local design-build studio that covers your lot from first sketch through final inspection – under one written contract at one written price. We’ve completed more than 900 ADUs across the Pomona Valley and the broader San Gabriel Valley since 2015, and every project starts with a written price before any work begins, per Haven Standard Clause 1. A live person answers at (657) 286-7915, around the clock, no voicemail queue.

Pomona homeowners typically come to us after reading a stack of contractor proposals that either skip the permit set entirely or treat the drawings as a separate – and separately billed – line item. That gap between the designer and the builder is where most ADU projects fall apart. Our single-contract model eliminates it: Nadia Ellery and the Ellery ADU Studio team own the drawings, the Permit Application, and the construction under one agreement. If the finished unit doesn’t match the permitted drawings, our 365-Day Done Right Promise requires us to make it right, in writing, before the project ever starts.

Fast, Local ADU Design & Permitting

When you call (657) 286-7915, a live person picks up – not an answering service that promises a callback. For Pomona addresses, we can typically schedule a Site Assessment within 48 hours of your first call, and we bring a documented photo record of every site visit so you have evidence of what we found, not a verbal summary of how the conversation went.

Pomona’s permit process runs through the City of Pomona Building and Safety Division, and timelines vary depending on whether your project triggers a ministerial approval or a discretionary review. In our experience, ministerial ADU permits in Pomona – standard detached units and garage conversions that meet state AB 2221 / SB 897 requirements – are moving through plan check in roughly six to ten weeks when the permit set is clean and complete on first submittal. A sloppy or incomplete set adds months. Because we treat the permit set as the core product, not an afterthought, our submittal packages are designed to pass on the first round.

Areas We Cover

Ellery ADU Studio serves Pomona and the surrounding communities across the eastern San Gabriel Valley and the Pomona Valley corridor. If your property is in Pomona, Montclair, San Dimas, Diamond Bar, Upland, Covina, Glendora, or Chino, you’re inside our primary service area and we can schedule a site assessment without a travel surcharge.

Each of these cities runs its own permit counter, and HOA & Zoning Compliance differences matter. Diamond Bar, for example, sits within the jurisdiction of Los Angeles County for portions of its unincorporated edges, which routes those permits through the LA County Department of Regional Planning rather than a city building department – a distinction that changes both the checklist and the timeline. Upland and Montclair both fall under San Bernardino County’s general building code framework but maintain independent plan check queues. We know which counter handles which parcel, and that knowledge is baked into your permit set before we submit it.

For a full breakdown of what the design and permitting process looks like specifically for Pomona addresses, see our detailed guide to ADU Design & Permitting in Pomona. And if you’d like a broader overview of how the studio operates across all five service categories, the Ellery ADU Studio home page lays out the full scope of the single-contract model.

What We Design and Permit

The five project types we handle are the ones California homeowners in Pomona actually build. Each one is covered by the same single contract, the same written price guarantee, and the same 365-Day Done Right Promise.

• ADU Design & Permitting: Full architectural drawings, Title 24 energy compliance, structural calculations, and a complete permit package submitted to the City of Pomona Building and Safety Division (or the applicable county counter for unincorporated parcels). In Pomona, all-in design and permitting fees for a new detached ADU typically run $18,000-$32,000 depending on square footage, site conditions, and whether the lot requires a geotechnical report.
• Garage Conversion ADU: Converting an attached or detached garage to a permitted ADU in Pomona typically costs $95,000-$145,000 all-in, drawings through final inspection. The slab condition, panel capacity, and setback compliance from the existing structure determine where your project lands in that range – all three are assessed at the site visit and documented in writing before your price is locked.
• New Detached ADU: Site-built or prefab-specified, depending on what the lot and budget call for. We have working relationships with Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, and Tuff Shed, and we specify those systems within the same single contract – no separate manufacturer agreement for you to manage.
• Junior ADU & Interior Conversion: Converting interior space (a bedroom suite, a bonus room, a finished basement) to a permitted JADU is typically the fastest path to a legal unit in Pomona, with all-in costs often landing in the $55,000-$90,000 range. State law caps JADUs at 500 square feet and requires an owner-occupancy covenant, both of which are documented in the permit set we prepare.
• Site Prep & Utilities: Grading, utility lateral extensions, panel upgrades, and sewer connection fees are line-itemed in your written quote before we start – not discovered mid-construction. In older Pomona neighborhoods like Lincoln Park and the historic downtown corridors, utility laterals frequently need upsizing, and we flag that at the site assessment.

Why Pomona Homeowners Choose a Single-Contract Studio

The Pomona housing market has shifted considerably since 2015. Homeowners who bought in the $450,000-$650,000 range in neighborhoods like Ganesha Hills, Campus Park, and the blocks south of the Pomona Fairplex are now sitting on equity that makes an ADU a legitimate long-term asset – rental income to offset a mortgage, a unit for an aging parent, or a structure that adds 15-20% to resale value in a city where lot sizes are generous enough to accommodate a detached unit without losing the yard entirely.

What those homeowners don’t need is a project that stalls because the architect’s drawings don’t match what the contractor planned to build. That designer-versus-builder blame gap is the most common reason Pomona ADU projects go over budget and over schedule. Our single-contract model closes it. Under Haven Standard Clause 5 (No Surprises), the scope is locked at signing – no doorstep change orders, no scope creep billed after the fact.

Nadia Ellery started the studio in 2015 specifically because California’s ADU permitting environment was changing – AB 2299, SB 1069, and the wave of state preemption bills that followed – and homeowners needed someone who treated the permit set as the product, not as paperwork generated after the real work was done. That positioning hasn’t changed. The permit set is still what we build everything else around.

What a Written Price Actually Looks Like

Every Ellery project quote is a line-item document. For a Pomona garage conversion, for example, the written price breaks out: demolition and hazardous material testing (older Pomona garages built before 1980 frequently contain asbestos in the floor adhesive), structural reinforcement to the existing slab and wall framing, electrical panel upgrade if the existing service is below 200 amps, HVAC mechanical design and installation, insulation to Title 24 standards, windows and exterior cladding (we spec James Hardie fiber cement on most Pomona conversions given the Inland Valley’s temperature swings), plumbing rough-in and fixture allowance, permit fees, and inspection costs.

You see all of that before you sign. That’s Haven Standard Clause 1. It’s not a philosophy – it’s a contractual requirement we put in writing on every project we take.

If you already have a written estimate from another studio or contractor, bring it. We offer a Free Second Opinion on any written estimate in hand, and we’ll tell you specifically what’s missing, what’s priced outside the Pomona market range, and what the permit set they’ve described will actually require at the City of Pomona counter.

Prefab and Modular Options Near Pomona

Pomona’s lot sizes – many in the 7,000-10,000 square foot range in neighborhoods like Philips Ranch and the Palomares Hills corridor – can accommodate a prefab or modular ADU without sacrificing usable yard. We specify and coordinate prefab systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, and Tuff Shed within the same single contract. That means the manufacturer’s delivery timeline, the site prep requirements, and the permit set are all coordinated by one team.

The common misconception is that prefab ADUs are cheaper across the board. Sometimes they are – a Mighty Buildings or Boxabl unit can compress construction time significantly, which reduces labor cost. But the site work (grading, utility connections, foundation) costs the same whether the unit arrives on a flatbed or is framed stick-by-stick. We’ll tell you which approach makes sense for your Pomona parcel after we see the site, and that recommendation will be in writing before you commit to anything.

ADU Design & Permitting Near Me – Frequently Asked Questions

How quickly can Ellery ADU Studio schedule a site assessment in Pomona?

For Pomona addresses, we can typically schedule a site assessment within 48 hours of your first call to (657) 286-7915. A live person answers that line 24 hours a day – there’s no voicemail queue and no callback promise that may or may not materialize. The site visit produces a documented photo record, not a verbal walk-through summary, so you have a written record of what was found before any design work begins.

Do you serve cities near Pomona, or only Pomona itself?

Ellery ADU Studio’s primary service area covers Pomona, Montclair, San Dimas, Diamond Bar, Upland, Covina, Glendora, and Chino, with no travel surcharge for those locations. Each city runs its own permit counter with its own checklist and timeline, and we know the differences – Diamond Bar’s unincorporated pockets route through LA County rather than a city department, for example, and that changes the submittal process. If your parcel is outside this list, call (657) 286-7915 and we’ll tell you directly whether your address is in range.

What does ADU design and permitting cost near Pomona?

Design and permitting fees for a new detached ADU in Pomona typically run $18,000-$32,000, depending on square footage and site complexity. Garage conversion ADUs generally land in the $95,000-$145,000 all-in range (drawings through final inspection), and Junior ADU interior conversions typically run $55,000-$90,000. Every project receives a written, line-item price before any work begins – that’s Haven Standard Clause 1, not a marketing claim. If you already have a written estimate from someone else, we offer a Free Second Opinion at no charge. Call (657) 286-7915 to book it.

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

Yes. A live person answers (657) 286-7915 at any hour – not an answering service that logs a message, but someone who can discuss your project. For existing Ellery clients, after-hours calls are handled by the same team that manages your project during the day. For new inquiries, the person who picks up can schedule your site assessment and start the process right then.

Is a permit really necessary for an ADU in Pomona?

Yes, and skipping it creates a problem that compounds over time. An unpermitted ADU in Pomona cannot be legally rented, will surface as a liability in any title search when you sell, and may require demolition or expensive retroactive permitting if the city flags it. California state law has significantly streamlined ADU permitting since 2017 – ministerial approval is required for most compliant units, meaning the city cannot deny a permit that meets the objective standards. A clean, complete permit set submitted to the City of Pomona Building and Safety Division is the fastest path to a legal unit, and that’s exactly what Ellery’s permit set is designed to be.

Key Takeaways

• Ellery ADU Studio serves Pomona and nearby cities including Montclair, San Dimas, Diamond Bar, Upland, Covina, Glendora, and Chino under one contract at one written price.
• Site assessments for Pomona addresses are typically schedulable within 48 hours; a live person answers (657) 286-7915 at any hour.
• Every project price is a line-item written quote delivered before work starts – Haven Standard Clause 1.
• The 365-Day Done Right Promise is in writing before the project starts: if the finished ADU doesn’t match the permitted drawings, Ellery makes it right.
• Design and permitting fees in Pomona typically run $18,000-$32,000; garage conversion all-in costs run $95,000-$145,000; JADU conversions typically run $55,000-$90,000.
• Prefab coordination (Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed) is included in the same single contract – no separate manufacturer agreement to manage.
• A Free Second Opinion is available on any written estimate already in hand.

Get a Written Price Before Any Work Starts

If your property is in Pomona or a nearby city and you’re ready to understand what an ADU will actually cost and how long the permit process will actually take, call (657) 286-7915. A live person will pick up, and we can have a site assessment scheduled within 48 hours. The written price you receive at the end of that process is the price – per Haven Standard Clause 1, no adjustments at the door. If you have an estimate from another studio already, bring it. The Free Second Opinion is there precisely so you can make this decision on facts, not promises.

Written by Nadia Ellery, Owner at Ellery ADU Studio Pomona, serving Pomona and nearby areas since 2015.