Frequently Asked Questions - ADU in Pomona, CA
We've been designing, permitting, and building ADUs in Pomona and the San Gabriel Valley since 2015. Here are the questions we actually get, answered directly.
Pricing & Cost FAQs
A detached ADU in Pomona typically runs between $250 and $450 per square foot, depending on whether you're building a garage conversion or ground-up construction. A 500-square-foot one-bedroom unit usually falls in the $125,000 to $225,000 range, while a 750-square-foot two-bedroom with a small kitchen often lands between $190,000 and $340,000. These figures include design, permits, and construction under one contract. We quote every job in writing before we start, under Clause 1 of The Haven Standard. Call (657) 286-7915 to schedule your free estimate.
Our price includes everything: architectural drawings, structural engineering, the permit set, city fees, and construction. We don't split these out because the ADU projects that fail are almost always the ones where the designer and builder can each blame the other. One contract, one price, one party responsible. You'll receive a written line-item quote before anyone starts work. Call (657) 286-7915 for your free estimate.
No. Our written quote is fixed. The Haven Standard, Clause 5, prohibits change orders unless you request additional work in writing. If we encounter unexpected conditions, we absorb them. We've seen too many Pomona homeowners get burned by contractors who lowball the bid and make it up on change orders. That doesn't happen here. Call (657) 286-7915 to get your fixed-price quote.
All utility connection costs, sewer capacity fees, and meter upgrades are itemized in your written quote before construction begins. In Pomona, sewer connection fees vary by parcel history, and we'll verify your specific charges during the feasibility study. Nothing gets buried in "allowances" or vague line items. Call (657) 286-7915 and we'll walk through every cost.
Most of our Pomona clients use some form of financing. Options include HELOCs, construction loans, and ADU-specific lending programs through California housing finance agencies. We don't originate loans, but we provide the detailed scope and fixed-price documentation that lenders require. Call (657) 286-7915 and we can discuss which financing path fits your situation.
Service & Process FAQs
From signed contract to move-in, most Pomona ADUs take 8 to 14 months. Design and permitting typically consume 3 to 5 months, construction another 5 to 9 months depending on size and site conditions. The 2015 state law streamlined ADU approvals, but Pomona's planning department still has its own review queue and inspection schedule. We build that reality into our timeline upfront. Call (657) 286-7915 to discuss your specific property.
We visit your property, measure setbacks, check utility access, and identify any zoning constraints specific to your Pomona parcel. Within a week, you get a written feasibility report with buildable square footage, placement options, and a preliminary budget range. There's no charge for this. It's how we avoid surprises later. Call (657) 286-7915 to schedule yours.
No. A detached ADU is built in your yard, not your house. The only disruption is temporary noise and occasional equipment access. We've built ADUs in crowded Pomona neighborhoods like Lincoln Park and north of Holt Avenue without displacing the main house residents. We coordinate site access in advance and text before we arrive. Call (657) 286-7915 to discuss your property layout.
Yes, though grading and foundation costs increase. Properties north of Foothill Boulevard or in the Phillips Ranch area often require stepped foundations or retaining walls. We address slope conditions in the feasibility study so the quote reflects reality, not a flat-lot fantasy. Call (657) 286-7915 to schedule a site visit.
An ADU (Accessory Dwelling Unit) is a separate living space, detached or attached, up to 1,200 square feet in Pomona. A JADU (Junior ADU) is carved out of your existing home, max 500 square feet, with a small efficiency kitchen and shared or separate bathroom. JADUs are cheaper but reduce your main living space. We design both and can explain which fits your property and goals. Call (657) 286-7915 to discuss options.
Brands & Parts FAQs
We offer both. For clients who want speed and predictable pricing, we work with manufacturers like Boxabl and Plant Prefab, whose units arrive pre-built and get craned onto your foundation. For custom designs or irregular lots, we stick-build on site with James Hardie siding and other premium materials. The feasibility study determines which approach makes sense for your Pomona property. Call (657) 286-7915 to explore both paths.
James Hardie fiber-cement siding performs exceptionally well in Pomona's hot, dry summers and occasional Santa Ana wind events. It doesn't warp like vinyl or rot like wood. For roofing, we typically specify composition shingles rated for high wind, or standing-seam metal where the design calls for it. Every material choice is documented in your scope of work. Call (657) 286-7915 to discuss options for your project.
Tuff Shed structures are designed for storage, not habitation. To convert one to a legal ADU, you'd need to replace the foundation, add insulation, upgrade electrical and plumbing, and essentially rebuild the structure to meet California Building Code. In most cases, starting fresh is more cost-effective. We can evaluate any existing structure during our feasibility study. Call (657) 286-7915 to schedule a look.
You choose. We provide a selection catalog with clear upgrade pricing for each tier. Most Pomona clients select from our standard package, which includes quality fixtures from established brands, then upgrade a few items that matter to them. Everything is itemized in your written quote before work begins. Call (657) 286-7915 to review our selections.
Licensing & Insurance FAQs
Yes. Every pro working under our name is required to hold the license and insurance California requires for ADU construction. We pull all necessary permits and schedule all inspections. Your permit set is part of our single-contract scope, not a separate service you have to coordinate. Call (657) 286-7915 to verify credentials for your project.
We pull every permit. The permit application, plan check revisions, and inspection scheduling are included in our scope. Pomona's building department has specific requirements for ADU fire separation, utility connections, and parking waivers. We navigate these routinely and document every approval in your project file. Call (657) 286-7915 to get started.
We carry general liability and workers compensation coverage as required by California law. Certificate of insurance is available on request. Because ADU construction is a significant project on your property, we also recommend you notify your homeowner's insurance carrier before work begins. Call (657) 286-7915 and we'll provide documentation.
Emergency & Response FAQs
Contact your project manager immediately. Every job has a named point of contact with a direct number. For urgent issues after hours, our phone is answered 24/7 by a live coordinator who connects you with the appropriate team member. We document every concern with photos and written response, under Clause 4 of The Haven Standard. Call (657) 286-7915 anytime.
We can pause work and secure the site if circumstances change. Because our quotes are fixed-price and paid in draw schedules tied to construction milestones, you're never far ahead of the work completed. We'll document the pause condition and resume when you're ready. Call (657) 286-7915 to discuss your situation.
We focus on new ADU design and construction, not repair work on structures we didn't build. If you have an emergency with an existing ADU, we can refer you to qualified trades in Pomona, Montclair, or surrounding areas. For new ADU projects, call (657) 286-7915.
Warranty & Guarantees FAQs
Every ADU we build carries a written workmanship warranty, documented in your contract before construction begins. The Haven Standard requires us to fix any defect in our work at no charge within the warranty period. We also pass through all manufacturer warranties on materials and fixtures. Your warranty terms are specific and in writing, not a vague promise. Call (657) 286-7915 for complete terms.
Clause 4 of The Haven Standard requires photos and readings of what we actually found and what we actually did. You receive a project closeout package with construction photos, inspection sign-offs, as-built drawings, and equipment manuals. This documentation protects your investment and simplifies any future sale or refinance. Call (657) 286-7915 to learn more.
Yes. The workmanship warranty stays with the property, not the owner. When you sell, your real estate agent can provide the buyer with our project documentation and warranty terms. We've had Pomona homeowners in the Lincoln Park and west Holt corridors use this documentation to demonstrate permit compliance and quality construction to buyers. Call (657) 286-7915 to discuss your project.
Call (657) 286-7915 or request a consultation online. We'll schedule a free feasibility study at your Pomona property, deliver a written assessment within a week, and provide a fixed-price quote if your project is viable. No pressure, no obligation. We've been building ADUs since 2015, and we know what questions homeowners actually have. We're happy to answer yours.
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 since 2015.
Still Have Questions?
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(657) 286-7915