New Detached ADU in Irvine - One Fixed Price, Permits Handled

Fast, Reliable New Detached ADU Across Irvine

A new detached ADU in Irvine typically runs $285,000-$480,000 all-in, from permit-ready drawings through final inspection, depending on size, finish level, and whether you choose custom stick-built or a prefab system. We’re Ellery ADU Studio, and our New Detached ADU team coordinates design, permitting, and construction under one written contract at one written price. Dispatch and scheduling run from our Los Angeles office, but our crews serve Irvine neighborhoods directly. Call (949) 541-8498 to schedule your free estimate.

Call (949) 541-8498

Why Ellery ADU Studio Santa Ana Is Irvine’s Preferred New Detached ADU Company

We’ve designed, permitted, and built over 900 ADUs since 2015, the year California’s ADU laws shifted, and a significant share of those sit in Irvine’s village neighborhoods. Our clients in Woodbridge, University Park, and Portola Springs come to us after learning that a detached ADU here involves two approval tracks, not one, and they want a studio that has navigated both before.

Our license number appears on every page, and our crews are background-checked and uniformed. Under Haven Standard Clause 1, every project carries a written price before any work begins - no “call for a quote” runaround. We also offer a Free Second Opinion on any written estimate already in hand.

A live person answers our phones 24/7. When an Irvine homeowner calls, they reach someone who understands village HOA timelines, not a voicemail queue with a callback promise that doesn’t materialize.

Our New Detached ADU Services in Irvine

Custom Built ADU

Custom stick-built detached ADUs in Irvine give you full control over layout and materials, which matters enormously here. The village architectural review committee will scrutinize your exterior palette against the primary home and village aesthetic, so material selection isn’t an afterthought - it’s a permit gate. We specify James Hardie siding, matching roof tile, and stucco blends that align with your village’s standards from the first submittal. A typical custom detached ADU in Irvine runs $320,000-$480,000 all-in, drawings through final inspection, per Haven Standard Clause 1.

Prefab ADU Installation

Prefab systems from Dvele, Mighty Buildings, and Plant Prefab can compress construction time, but in Irvine they still must clear the same dual-track approval. We coordinate with the manufacturer to produce elevation drawings and material boards that satisfy your village committee before the unit ships. Prefab detached ADUs in Irvine typically run $285,000-$395,000 all-in. The key is front-loading the architectural review so the module doesn’t arrive while the committee is still deliberating.

Modular ADU

Modular construction differs from site-built in that modules are factory-finished and craned into place, which reduces on-site labor in Irvine’s tighter alley-loaded lots. In villages like Portola Springs and Great Park, where motor-court access limits staging space, modular delivery can be the only practical path for a detached unit. We specify modular systems and coordinate crane access, utility tie-ins, and the village committee’s exterior-material sign-off as a single workflow. Modular detached ADUs in Irvine typically start around $295,000 and run to $410,000 depending on module count and finish.

Studio ADU & 1-Bed & 2-Bed ADU

Studio detached ADUs in Irvine suit rental-income goals on smaller lots, while 1-bedroom and 2-bedroom configurations work for multigenerational use or higher rental yields. In Woodbridge and University Park, where 1980s tract homes sit on flat rear yards with block-wall perimeters, a studio or 1-bedroom detached unit often fits neatly behind the garage. In newer villages, siting strategy shifts. Every configuration gets its own right-sized HVAC system - non-negotiable in Irvine’s inland Saddleback Valley heat, where south- and west-facing block walls trap radiant energy and summer highs push into the mid-to-upper 90s. Studios typically run $285,000-$340,000; 1-bed units $310,000-$395,000; 2-bed units $355,000-$480,000.

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Trusted Brands We Service in Irvine

We specify and coordinate prefab and modular systems from Dvele, Mighty Buildings, and Plant Prefab, integrating them within our single-contract design-build model. Our familiarity with these brands’ documentation packages means we can produce village-committee-ready submittals faster than studios learning the systems on your dime. For custom builds, we source James Hardie siding and other materials with proven acceptance records across Irvine’s village HOAs. Parts and samples are staged locally so material-board submissions don’t wait on shipping.

Common New Detached ADU Problems We See in Irvine Homes

• Standard permit sets without color/material boards. A contractor submits city-ready drawings to the village architectural committee and gets pulled up short because the elevations don’t show material and color matches to the primary home. We pre-assemble the board before first submittal.
• Wrong siting strategy for alley-loaded or motor-court lots. Portola Springs and Great Park don’t offer the flat rear yard of Woodbridge. A detached ADU here needs utility routing and access plans that differ fundamentally from older villages.
• HVAC undersized or omitted. Irvine’s inland microclimate means a detached ADU with south or west exposure, enclosed by block walls, will cook without its own properly sized system. We size for design temperature, not square-footage rules of thumb.
• Construction starts before village sign-off. Some builders treat HOA review as a formality and begin grading or foundation work. In Irvine, that’s a stop-work order waiting to happen. We schedule construction starts only after both approvals are in hand.

Pricing for New Detached ADU in Irvine, CA

The Irvine Dual-Track Reality: How We Schedule Around It

In Irvine, a detached ADU needs two approvals - the City of Irvine building permit plus a sign-off from the village HOA’s architectural review committee - and even though California law bars HOAs from blocking ADUs outright, those committees still enforce roofline, material, and color matches to the primary home and village aesthetic. That dual track routinely adds several weeks of review that ADU builders in Santa Ana, Anaheim, or Costa Mesa don’t face.

We file both packets simultaneously, not sequentially. Our permit set includes the city-required structural and MEP drawings plus the village committee’s elevation sheets, material board, and color palette match. We don’t start construction until both approvals are in hand, so your project never sits half-framed while a committee deliberates. This is the defining competency in Irvine’s ADU market.

In Woodbridge, a homeowner wanted a detached one-bedroom ADU behind their 1980s tract home, but the first submittal stalled because the elevations didn’t carry a color/material board matching the existing stucco and tile. We re-filed with a James Hardie siding sample set keyed to the primary home’s palette plus a roofline match, sized the unit with its own right-sized HVAC against that west-facing block wall, and cleared both the village committee and the city before framing started.

We Also Serve Cities Near Irvine

Our crews work throughout Orange County, including Irvine and neighboring Tustin, Santa Ana, Orange, and Lake Forest. Village HOA requirements vary by city - some have none - and we adjust our submittal strategy accordingly.

FAQs - New Detached ADU in Irvine