Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Irvine
Adding square footage or building an ADU in Irvine takes a contractor who understands the city’s dual-approval process: first your village Architectural Review Committee, then the City of Irvine permit desk. Barrett & Sons Construction handles both. We file the ARC submittal with your village’s exact design standards baked in, revise as needed, pull the City permit, and run the job through final inspection without leaving you stalled between committees. Tom Barrett and his sons work directly on Irvine projects, and a live person answers our phone around the clock. Call (877) 610-1318 to schedule your free estimate.
Key Takeaways:
- Home additions in Irvine run $45,000-$130,000; detached ADUs run $90,000-$220,000; garage conversions run $30,000-$80,000.
- Irvine’s village ARCs approve materials, colors, window profiles, and rooflines before the City will final most permits.
- Every price change arrives as a written change order before work proceeds. Every eligible job gets permits pulled and inspections signed.
- We’re backed by the written 90-Day Done Right Promise and a permanent 10% senior and veteran discount.
Why Barrett & Sons Construction Is Irvine’s Preferred Home Additions & ADU Company
We’ve been owner-operated since 1998, and the same name on our trucks is the name on your contract. Tom Barrett publishes his name, address, and license number so you can verify us before signing anything. In Irvine specifically, that matters more than most places. Your HOA’s design guidelines are enforceable, your City inspector reads them, and a contractor who files the wrong window color or roof pitch costs you weeks. We’ve worked the ARC process in University Park, Woodbridge, Northwood, Westpark, Quail Hill, Portola Springs, and Great Park Neighborhoods, so we file what passes the first time.
Calls are answered by a live person, 24/7, not an out-of-state call center. Crew members who carry the Barrett & Sons name are background-checked and uniformed on every visit. And every scope change, every allowance, every price adjustment arrives on paper before a single nail moves. Our promise is simple: if it’s not done right, Tom comes back and makes it right, one call. That’s the 90-Day Done Right Promise, written on every contract.
Our Home Additions & ADU Services in Irvine
ADU Design & Permitting
This is where most Irvine ADU projects win or lose. We handle the full dual-approval pipeline: village ARC submittal first, City of Irvine permit second. We draw and spec your ADU to match your village’s required window profiles, exterior materials, roof pitch, and color palette before the committee ever sees it. In University Park and Woodbridge, for example, replacement windows and ADU windows often must match the original 1970s sash profile and grid pattern. In Great Park Neighborhoods, detached ADUs must meet modern flat-roof and stucco color-palette rules. We file it right the first time, and we schedule work so it doesn’t sit half-finished waiting on a committee.
Garage Conversion ADU
Converting an attached garage in Irvine takes more than framing a wall. Many villages require you to replace the lost garage space with a covered carport or an extra driveway bay. We verify your HOA’s parking replacement rules before we design anything. A garage conversion in Irvine typically runs $30,000-$80,000, and the ARC approval route can add three to six weeks to the timeline depending on your village’s meeting calendar. We file the submittal, attend the hearing if your village requires it, and start rough-in only after sign-off is in the file.
New Detached ADU
A detached ADU in Irvine is subject to the City’s setback and lot-coverage rules plus your village’s stricter design standards. In neighborhoods like Portola Springs and Quail Hill, exterior color, roof pitch, and even hardscape edges get ARC scrutiny. Our crew framed a 640-square-foot detached ADU in Portola Springs after the ARC flagged our first submittal for roof pitch and exterior color. We revised the scope of work to a 4:12 shingle roof and a warm-stucco tone from the village’s approved palette, resubmitted, and got ARC sign-off within three weeks. We then pulled the City permit and ran rough-in for the junior ADU’s kitchenette and bath, scheduling inspections so the project never sat idle waiting on a committee calendar. That’s how it should work.
Junior ADU & Interior Conversion
Junior ADUs and interior conversions use existing envelope space, which often means a lighter ARC review, but your village may still care about exterior changes like added windows or exterior doors. We check which items trigger full review before we design around them. Interior conversions in Irvine range from $45,000-$130,000 when they involve real structural work, and we handle the framing, electrical, plumbing, insulation, and Title 24 energy compliance for you.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Irvine
We install windows and doors from Simonton, Ply Gem, PGT, and CGI. That matters in Irvine, where village ARCs in University Park and Woodbridge require replacement windows to match the exact original sash profile, grid pattern, and frame color specified in the village’s design guidelines. A code-compliant but aesthetically non-conforming window can trigger mandatory removal at the homeowner’s cost before the City will final the permit. We order the right profile from brands that still make historic grid patterns, and we verify the finish against your ARC’s approved sample board before we order.
Common Home Additions & ADU Problems We See in Irvine Homes
- Submitting ADU plans to the City before the village ARC has approved exterior materials, colors, and roofline. The City won’t final the permit until the HOA’s sign-off is in the file. That sequencing mistake alone adds weeks to a project that could have moved forward.
- Choosing a garage-conversion ADU without verifying the HOA’s parking replacement rules. Many Irvine villages require the lost garage space to be replaced with a covered carport or an extra driveway bay. We check this before design work starts so you don’t discover it at the hearing.
- Ignoring hillside geotech in Turtle Rock or Quail Hill. Expansive clay soils on slopes shift seasonally, and a soil report with possibly deeper footings is often required. Skipping that step causes foundation cracking and a failed inspection sign-off.
- Filing a roof pitch or color that isn’t in the village’s approved palette. We’ve seen projects stall for months because a contractor spec’d a roof pitch the ARC has never approved. We file to the village’s published standards the first time.
Pricing for Home Additions & ADU in Irvine, CA
Irvine’s market reflects the dual-approval process and the cost of building to your village’s design standards. Here’s what we’re seeing across the city:
| Service | Typical Irvine Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What moves the number: your village’s ARC requirements for windows, roof pitch, and exterior finishes; whether you need a geotechnical report (hillside lots in Turtle Rock and Quail Hill often do); whether your existing panel supports the added load; and the condition of your foundation, especially in older villages like Woodbridge and University Park where post-tension slabs and galvanized plumbing are common. We quote a fixed price in writing, and any change arrives as a written change order before work proceeds. Call (877) 610-1318 for a free estimate and we’ll walk your specific project’s numbers line by line.
We Also Serve Cities Near Irvine
Our crews work across Orange County’s master-planned communities every week, including Tustin, Aliso Viejo, Santa Ana, and North Tustin. If you’re deciding between a room addition and an ADU, start with our Home Additions & ADU team, or read more about how we approach Home Additions & ADU in Irvine specifically. We’ll meet you at your property, walk the ARC requirements for your village, and quote a written scope before you commit to anything.
Serving Irvine, CA - Our Local Coverage Area
We’re based in the Irvine area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Irvine
Yes. In most Irvine villages, the Architectural Review Committee must sign off on exterior materials, colors, roofline, and window profiles before the City of Irvine will accept a permit application for a room addition. We file the ARC submittal first, get sign-off in writing, then submit to the City. That sequence keeps your project moving instead of stalling at the permit desk. Call (877) 610-1318 and we’ll tell you exactly what your village’s committee requires.
Typically three to six weeks, depending on the village’s meeting calendar and whether your first submittal matches the design guidelines exactly. Woodbridge’s ARC can be particular about window mullion profiles and exterior colors, so we spec to the published standards before filing. If a revision is needed, we handle it and resubmit; we don’t leave you to chase the committee yourself. Call (877) 610-1318 for a project-specific timeline.
Often yes, but you may need to replace the lost garage space with a covered carport or an extra driveway bay. University Park’s HOA has specific parking replacement rules, and the City won’t final the permit until the HOA’s sign-off is in the file. We verify your lot’s options before we design the conversion. Call (877) 610-1318 and we’ll check your specific street and lot.
Usually yes. Quail Hill sits on slopes with expansive clay soils that shift seasonally, and the City of Irvine typically requires a soil report and possibly deeper footings before foundation work. Skipping that step causes foundation cracking and a failed inspection sign-off. We order the geotech review early so it never delays the pour. Call (877) 610-1318 for an exact scope on your lot.
We spec exterior colors, roof pitch, and materials from the village’s published palette before we file the ARC submittal. In Great Park Neighborhoods, detached ADUs must meet the district’s modern flat-roof and stucco color-palette rules. Once sign-off is in the file, we run rough-in and inspections on our schedule, not the committee’s. Call (877) 610-1318 to start the submittal packet today.
Ready to add space in Irvine? Call (877) 610-1318 for a free estimate. We’ll walk your property, map the ARC requirements for your village, and hand you a written scope and price before you commit to anything.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Irvine and Orange County since 1998.