ADU Design & Permitting in Pomona - Plans, Permits & Build, One Fixed Price

Fast, Reliable ADU Design & Permitting Across Pomona

ADU design and permitting in Pomona typically runs $8,500-$18,000 for the full permit set and application package, with most projects reaching plan-check approval in 10-14 weeks once submitted. We’re Nadia Ellery’s team at Ellery ADU Studio, and we’ve been designing, permitting, and building ADUs across the eastern San Gabriel Valley since 2015. Our crews serve Pomona directly, with scheduling coordinated from our Los Angeles office. If you’re on a 7,000 sq ft lot in Lincoln Park, a post-war ranch near Ganesha Park, or a bungalow off Holt Avenue, we know the parcel conditions, the utility constraints, and the city’s plan-check rhythms. Call (840) 212-3065 to schedule your free estimate. We’ll bring a written price, not a callback promise.

Call (840) 212-3065

Why Ellery ADU Studio Upland Is Pomona’s Preferred ADU Design & Permitting Company

Pomona homeowners don’t hire us because we’re close. They hire us because we document what we find, fix what we promise, and put the price in writing before any work starts. Haven Standard, Clause 1.

We’ve designed, permitted, and built over 900 ADUs since 2015. Every one had a written price before work began. Every one has a documented photo record. That matters in Pomona, where the housing stock is older, the unpermitted structures are common, and the surprises are real.

Our crews know the difference between a 1940s bungalow slab and a 1960s ranch pad. They know which neighborhoods still run on 60A panels and galvanized supply lines. They know that Pomona’s building department will halt your ADU permit if there’s an unpermitted garage conversion on the parcel, even if you didn’t build it.

A live person answers our phones 24/7. No voicemail queue. No callback that doesn’t materialize.

Our ADU Design & Permitting Services in Pomona

Site Assessment

Every Pomona ADU starts with what we actually find on your parcel, not what Zillow says. We measure setbacks against the property line, locate sewer laterals, and check for unpermitted structures that could block your permit. In Pomona, this step is critical: the city requires any existing unpermitted garage conversion or backyard structure to be either legalized or demolished before your ADU permit is accepted. We’ve seen homeowners on Palomares Street and in the Mayfair area blindsided by this rule. Our site assessment documents the condition of your electrical panel, your water supply line, and your garage slab so the design that follows is based on facts, not assumptions. The photo record from this visit goes to you within 24 hours.

ADU Design & Blueprints

Our ADU Design & Permitting team produces construction-ready drawings, not concept sketches. For Pomona’s post-WWII housing stock, this means designing around existing utility locations, specifying structural connections to older foundations, and detailing the thermal envelope for real Inland Valley conditions. On a recent project near Lincoln Park, we converted a detached two-car garage into a 480 sq ft ADU with a vaulted ceiling, architectural glass on the alley-facing wall, and custom rift-oak millwork. Lead times on that glass and cabinetry, not labor, set the eight-week schedule. We locked the fixed price in writing before orders went out. That’s how we work.

Permit Application

Pomona’s building department reviews ADU permits against California’s state-mandated streamlining rules, but local conditions still matter. We submit complete packages: structural calcs, energy compliance forms, Title 24 documentation, and site plans that account for Pomona’s specific zoning overlays. Because we handle both design and construction under one contract, there’s no designer-versus-builder blame gap if the city requests corrections. We answer plan-check comments directly, resubmit fast, and keep the permit moving.

HOA & Zoning Compliance

Some Pomona neighborhoods, including parts of the Phillips Ranch area, operate under homeowners associations with additional design guidelines. We review CC&Rs before drafting begins, not after. If your HOA restricts exterior finishes, roof pitches, or parking configurations, we build those requirements into the initial design so the permit set doesn’t need revision later.

Title 24 Energy Compliance

Title 24 is California’s energy code, and Pomona’s climate zone designation triggers specific requirements that coastal LA designs often miss. Every conditioned space must meet minimum insulation values, and every HVAC system must be sized to actual heating and cooling loads. In Pomona, that means specifying mini-splits rated for real temperature extremes, not mild-year-round assumptions. We model the energy compliance package during design, not as an afterthought, so the permit clears on first submission.

Trusted Brands We Service in Pomona

We specify and coordinate prefab and modular systems from Abodu, Cover, and Mighty Buildings within the same single-contract framework as our custom designs. For Pomona homeowners considering a faster path to rental income, these systems can compress the construction timeline significantly, but the permitting process remains identical: site assessment, Title 24 modeling, and plan-check submission. We don’t push prefab over custom or vice versa. We price both in writing, with the same Haven Standard protections, and let the numbers and your timeline decide.

Common ADU Design & Permitting Problems We See in Pomona Homes

• Coastal-spec mini-splits that fail in Pomona heat. Designers unfamiliar with the Inland Valley spec small, single-zone units rated for mild climates. When July hits 105°F, those systems can’t keep up, and the homeowner faces a re-spec, permit revision, and construction delay. We size for Pomona’s actual temperature range from the start.
• Unpermitted legacy structures blocking the permit. Pomona has a high density of informal garage conversions and backyard buildings from decades of multigenerational living. The city will not issue your ADU permit until these are legalized or demolished. We catch this during site assessment, not after you’ve paid for drawings.
• Electrical panels that can’t handle the load. Most Pomona homes from the 1940s-1970s run on 60-100A service. An ADU with electric cooking, laundry, and HVAC needs 200A. The panel upgrade and new meter add cost and time that many homeowners don’t budget for. We identify this upfront and include it in the written price.
• Long-lead materials ordered before pricing is fixed. Custom millwork, architectural glass, and specialty finishes drive high-end ADU schedules, not labor availability. Homeowners who order these before locking a written price expose themselves to cost creep when lead times stretch. We fix the price first, then place orders. Haven Standard, Clause 5.

Pricing for ADU Design & Permitting in Pomona, CA

We Also Serve Cities Near Pomona

Our crews work throughout the eastern San Gabriel Valley and western Inland Empire. We regularly design and permit ADUs in Pomona, Diamond Bar, Montclair, Chino Hills, and Ontario. Each city has its own plan-check timeline, zoning quirks, and climate considerations, and we adjust our permit packages accordingly rather than submitting generic sets.

FAQs - ADU Design & Permitting in Pomona