Detached ADU
Standalone unit on the lot — biggest rental upside, longest schedule. Strongest fit when the Irvine lot has the room to give it.
ADU Construction · Irvine
Irvine ADU Regulations.
Detached, attached, Junior ADU, and garage-conversion ADUs in Irvine, fully permitted, designed for your vision, and built end-to-end by Avorino.
Irvine · Executive summary
What does an Avorino ADU in Irvine actually involve?
Avorino builds ADUs in Irvine, Orange County end-to-end — design, engineering, permits, and construction under one roof. ADU projects in Irvine typically run $85K – $440K+ all-in depending on type — garage conversion at the low end, detached at the top — priced fixed in a single contract.
Avorino designs, permits, and builds ADUs in Irvine: detached, attached, Junior ADU, and garage conversion. California state ADU law preempts most city setbacks (4-ft minimum side + rear) and starts a 60-day ministerial clock on a complete application (Gov. Code §66317), so each correction round delays when that clock begins. We carry the city correspondence and tiered warranty under one roof.
- Detached ADU$245K – $440K+ · 5–8+ mo
- Attached ADU$200K – $350K+ · 5–8+ mo
- Junior ADU$135K – $220K+ · 4–6+ mo
- Garage conversion$85K – $170K+ · 4–6+ mo
- Plan check4–6+ wk · state 60-day clock starts once the file is complete
7+ years of OC experience · 150+ projects · 4.8 Yelp average across 35+ reviews.
Talk To Us
Free Irvine ADU estimate.
Two minutes, no pressure. We reply as soon as possible. Irvine permits handled.
Start my free estimate ↓Or call (714) 900-3676Local context
Building ADUs in Irvine.
Irvine is a master-planned city, and that shapes ADU work more than any zoning table does. Every lot sits inside a village — Woodbridge, Northwood, University Park, Turtle Rock, Westpark, Oak Creek, Portola Springs — and every village carries its own association with its own design review. An Irvine ADU therefore clears two gates, not one: the city's ministerial review and the village association's read on massing, color, and roof material. We run both tracks in parallel so neither waits on the other.
The city side is unusually organized. Applications go through the IrvineReady! online permit portal with a Residential Accessory Dwelling Unit (RADU) application and the city's ADU Verification Form; staff screen the package for completeness in roughly two business days, and a notarized covenant gets recorded with Orange County before permits issue. The packet also carries a school-fee determination and a Transportation Corridor Agency form — small steps that stall owners who file alone, and routine steps for an office that files them weekly.
Which unit fits depends on the village's era. The Ranch-era villages of the 1960s and 70s — University Park, The Ranch, Culverdale — carry the most generous rear yards in the city and take detached backyard units cleanly. Newer villages run tighter side yards, where attached units and garage conversions do the work instead. Irvine also runs a Pre-Approved ADU Plans program (Standard Plans reviewed by the city and purchased from their design firms); a site-specific review still applies, and we'll tell you honestly whether a standard plan or a custom drawing serves your lot better.
@avorinoconstruction
Our work in Irvine, on Instagram.
“Avorino built us an ADU recently. They provided the full design and rendering, pulled permits, and built our 1,000 sqft ADU from start to finish. Easy to work with, prices very competitive. We've already recommended Avorino to friends.”
Which ADU lands cleanly in Irvine.
01/04
Permitting
City of Irvine Community Development — Development Assistance Center.
Avorino handles all submissions, plan-check corrections, and approvals on your behalf.
- Verify homeowners association rules
- Pre-application consult
- Submit plans
- Plan check & corrections
Timeline
Design to Move-In
From initial consultation to a fully finished, move-in ready ADU in your backyard.
- Consultation and site assessment
- Custom design and engineering
- City plan check: 4–6+ weeks, and longer once corrections come back
- Construction — typically 8–12+ weeks on a garage conversion; detached builds run several months, inside the 5–8+ month project window
- Final inspection and certificate of occupancy
Zoning
Irvine Zoning & Setbacks
Irvine follows California state ADU guidelines.
- 4-foot minimum from rear and interior side property lines
- 16 feet for single-story detached ADUs
- 5,000–8,000 sqft lot sizes in most neighborhoods
- No additional parking required if within 0.5 miles of transit
Investment
$85K – $440K+
Full design-build cost
Architecture, engineering, permits, and construction — all included in a fixed-price contract.
- Detached ADU: $245K – $440K+ · 5–8+ mo
- Attached ADU: $200K – $350K+ · 5–8+ mo
- Junior ADU: $135K – $220K+ · 4–6+ mo
- Garage conversion: $85K – $170K+ · 4–6+ mo
- Permit + design fees: $6K – $15K+ typical · Impact fees waived at 750 sqft or less
- Rental income (Irvine range): $2,800 – $4,500+/mo
Verify with the city
All Irvine ADU, custom-home, and construction details on this page, including fees, setbacks, timelines, and zoning, are based on the City of Irvine Building & Safety Division's published information and are subject to change. This information may not be fully up to date or accurate. For the latest requirements, visit the city's building and planning department directly, and confirm anything that affects your budget or schedule before you build.
- Building authorityCity of Irvine Building & Safety Division
- Official websitecityofirvine.org
See how every OC city & community takes ADU permits — the Permit Index
Official Irvine ADU resources this page draws from
- City of Irvine — Project: Constructing an Accessory Dwelling Unit (ADU)
- City of Irvine — Pre-Approved ADU Plans Program
- City of Irvine — Building Permits and Inspections (IrvineReady! overview)
- City of Irvine — IrvineReady portal (goPost / eGov)
- IrvineReady! goPost online plan-submission login (ePlanSoft)
- City of Irvine — Pre-Approved ADU Development Standards Checklist, Form 67-01 (rev 01/25)
Lot profile
What Irvine lots actually look like.
Irvine parcels are engineered pads — flat, regular, drained — which removes the soils drama other OC cities carry. The variable is the village: lot width, rear-yard depth, and the association's exterior palette differ block to block, and the right ADU type falls out of those three facts.
- Flat engineered pads village-wide — no hillside soils reports on typical lots
- Ranch-era villages (University Park, Culverdale, The Ranch): deepest rear yards, detached-ADU territory
- Newer villages (Westpark, Oak Creek, Portola Springs): tighter side yards — attached units + garage conversions
- Village association design review on exterior color, roof tile, and massing — runs alongside city plan check
- Both water AND sewer are Irvine Ranch Water District — IRWD collects and treats its own wastewater and runs purple-pipe recycled water — so meter sizing, will-serve, and connection go through IRWD, not the city.
- Irvine sits in OC San Revenue Area 14, funded through IRWD by contract, so an Irvine ADU isn't billed OC San's standard capacity charge the way central/north-county ADUs are — a genuine cost break.
- Irvine's 2025 CAL FIRE maps push Very High / High zones into Orchard Hills, Portola Springs, Turtle Rock, and Quail Hill — a WUI ADU there carries ignition-resistant construction and defensible space.
Permit reality
RADU filing, homeowners association review, and the quick facts.
Irvine reviews ADUs ministerially under state statute, and the machinery is genuinely fast when the package lands complete: the IrvineReady! portal, a completeness screen in about two business days, then plan check inside the state's 60-day clock for complete applications. What slows owner-filed projects is the paperwork constellation around the drawings.
- Submission is 100% online through Irvine's own IrvineReady! portal (goPost / ePlanSoft, Chrome required) — no email or over-the-counter drop. Avorino runs the pre-application, uploads the PDF plan sets and forms, and works corrections in the portal.
- IrvineReady! online portal — RADU application + ADU Verification Form required on every ADU/JADU
- Completeness screen in ~2 business days; fees invoiced by email before review starts
- Notarized covenant recorded with Orange County before permit issuance
- School-fee determination + Transportation Corridor Agency forms ride in the same packet — we file all of it
- Two-track intake: eligibility is verified up front by the Planning Team via a signed ADU Verification Form, then Building & Safety runs the permit with a completeness screen in about two business days.
- Irvine runs a Pre-Approved ADU Plans / Standard Plan Program (city-reviewed plans), with a village association design review often running in parallel.
Irvine ADU rules
RADU filing, homeowners association review, and the quick facts.
Irvine reviews ADUs ministerially under state law, but every project clears two gates: the city's plan check and your homeowners association's design review. Irvine calls its neighborhoods villages, and each one runs its own association. The city machinery is genuinely fast when the package lands complete, and these are the working facts an Irvine ADU actually runs on.
| Standard | What applies in Irvine |
|---|---|
| Review path | Ministerial under state law — a completeness screen in about 2 business days, then plan check inside the 60-day state clock for complete applications. |
| How permits are filed | IrvineReady! online portal (goPost) — the RADU application plus the city's ADU Verification Form on every ADU/JADU. No counter drop. Avorino files and tracks the package there. |
| Side + rear setbacks / height | 4 ft side and rear for a new detached ADU, 16 ft height — the state floors Irvine reviews against. |
| Before your permit issues | A notarized covenant records with Orange County, and a school-fee determination plus a Transportation Corridor Agency form ride in the same packet. |
| Homeowners association design review | Associations can't ban ADUs, but design review of exterior color, roof material, and massing is still theirs. We run it in parallel with city plan check. |
| Pre-approved plans | Irvine's Pre-Approved ADU Plans program offers city-reviewed Standard Plans; a site-specific review still applies to every lot. |
| Fees to know | No standard OC San capacity charge — Irvine sits in Revenue Area 14, funded through IRWD, so the regional sewer fee central-county ADUs pay isn't billed here. |
Summarized from the city's ADU project pages and state ADU law; village standards and fire-zone overlays vary by village and parcel. Avorino confirms what your exact lot carries in the free consultation.
Investment range
Where Avorino's ADU budgets in Irvine typically land.
Inland Irvine ADU work tracks the OC average. Flat-lot construction, straightforward foundations, and clean utility runs keep build budgets predictable. Detached unit budgets typically land in the $245K–$440K+ range; attached and Junior ADU options trim significantly.
- Detached ADU: $245K–$440K+ typical fixed-price contract
- Attached ADU: $200K–$350K+ typical
- Junior ADU: $135K–$220K+ typical
- Permit + design fees: $6K–$15K+ typical
- Rental income (Orange County range): $2,500–$4,500+/mo, modeled on real OC long-term rents
- No standard OC San capacity charge — Irvine's Revenue Area 14 (funded through IRWD) skips the regional sewer fee central and north-county ADUs pay
- School-fee determination + Transportation Corridor Agency form ride the permit packet; fees invoiced by email before plan check starts
How an Orange County ADU budget is built up, line by line — the same breakdown behind the Irvine range above.
Run your numbers
What would an ADU pencil out to in Irvine?
Two free tools, calibrated to 2026 Orange County bids — a cost range in about a minute, and the rental return behind it.
Irvine is one of 37 cities covered by our Orange County ADU construction service.
Nearby ADU markets
Other cities Avorino builds in.
Comparing ADU build options across the Irvine corridor? Here’s the same end-to-end Avorino build, in the cities right next door.
Same city, other services
Avorino also runs these in Irvine.
- Custom HomesBespoke residential, architect-coordinated.
- New ConstructionGround-up: site prep through Certificate of Occupancy.
- CommercialTenant improvements, retail, restaurant, office, ground-up.
- ADUDetached, attached, Junior ADU, garage conversion.
Common questions — Irvine
- Does Avorino build ADUs in Irvine?
- Yes. Avorino builds ADUs in Irvine. Detached, attached, Junior ADU, and garage-conversion ADUs handled end-to-end from permits through certificate of occupancy.
- Is Avorino a licensed ADU contractor in Irvine?
- Yes. Avorino carries California General-B License #1107538 and builds ADUs in Irvine end-to-end. With Avorino as the Irvine ADU contractor on your project, design, engineering, permits, and construction stay under one roof, so the schedule and the outcome sit with one company, not a chain of subcontractors you'd manage yourself.
- How does ADU permitting work in Irvine?
- Avorino handles all submissions, plan-check corrections, and approvals on your behalf. The path: Verify homeowners association rules → Pre-application consult → Submit plans → Plan check & corrections.
- What's the typical Irvine ADU build timeline?
- From initial consultation to a fully finished, move-in ready ADU in your backyard. City plan check: 4–6+ weeks, and longer once corrections come back. Construction — typically 8–12+ weeks on a garage conversion; detached builds run several months, inside the 5–8+ month project window. Avorino carries that schedule end-to-end, from permit submission through to certificate of occupancy.
- What's the Irvine ADU investment range?
- Architecture, engineering, permits, and construction — all included in a fixed-price contract. Range: $85K – $440K+. That is an Avorino quote for your own lot, not a market average.
- Does my Irvine village association have to approve my ADU?
- State law stops associations from banning ADUs outright, but design review — exterior color, roof material, massing — is still theirs. We submit the association package in parallel with city plan check so the two reviews run on the same calendar instead of back-to-back.
- Does Irvine have pre-approved ADU plans?
- Yes — Irvine runs a Pre-Approved ADU Plans program with Standard Plans reviewed by the city and sold by their design firms. A site-specific review still applies to every lot. We'll give you a straight read on whether a standard plan or a custom drawing fits your lot and village better.
- What forms does an Irvine ADU actually require?
- The RADU application, the city's ADU Verification Form, a notarized covenant recorded with Orange County, a school-fee determination, and a Transportation Corridor Agency form — plus the drawings. Avorino prepares and files the full packet through the IrvineReady! portal.
- How fast does Irvine respond to an ADU application?
- The city screens submissions for completeness in roughly two business days, and state law gives it 60 days to act on a complete application. Complete is the operative word: each correction round pushes back when that clock starts, which is why real turnaround usually runs past the statute. Our packets land complete to keep the correction rounds down.
- How do I submit an ADU permit in Irvine?
- Irvine is online-only: applications and PDF plan sets go through the city's own IrvineReady! portal (goPost / ePlanSoft, Chrome required) — there's no email or counter drop. Eligibility is verified first by the Planning Team via an ADU Verification Form, then Building & Safety runs the permit with a completeness screen in about two business days. Avorino files and tracks the whole package.
- Does the OC San sewer capacity charge apply to an Irvine ADU?
- Not the standard way — Irvine is in OC San Revenue Area 14, funded through Irvine Ranch Water District by contract, so an Irvine ADU isn't billed OC San's usual Capital Facilities Capacity Charge that central and north-county ADUs face. Water and sewer both run through IRWD. On the hillside villages, 2025 Very High Fire Zone construction applies. Avorino files with IRWD and carries any fire review.
Talk To Us
Tell us about your Irvine vision.
Drop the address and what you're picturing. We read it as soon as possible and come back with the strongest ADU type for your specific Irvine vision, and what Irvine permitting is known to throw at the project.
- 7+YearsOrange County experience
- B-#1107538LicenseCalifornia General-B
- 37OC Cities + CommunitiesCoverage across all of Orange County
- 4.8★RatingYelp
Direct linePrefer a phone call?
Quote form shown.