A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Irvine, CA
Adding an ADU in Irvine, CA comes with a specific set of rules, lot configurations, and architectural expectations that you will not find in most of Orange County. This page explains what makes Irvine ADU work different, what it typically costs, which neighborhoods we cover, and how Benson ADU Builders handles the process from written price to final inspection. The short version: a detached ADU in Irvine generally runs $180,000 to $380,000, a garage conversion $95,000 to $180,000, and a home addition $150,000 to $350,000, depending on size, site prep, and finish level. Call (903) 568-7222 for a free written estimate.
Why Irvine Homes Are Different
Irvine is a master-planned city, and that changes how contractors work here. Most homes sit inside homeowner associations with CC&Rs that dictate exterior finishes, roofline compatibility, landscaping, and even where a dumpster can park during construction. Before we price a detached ADU, we review the HOA guidelines for your village – Woodbridge, Northwood, Turtle Rock, Westpark, or University Park, for example – because those rules affect siding material, window styles, and whether a two-story unit is even possible on your lot.
The housing stock matters too. A large share of Irvine homes were built from the 1970s through the early 2000s, and lot sizes trend smaller than what you find in Tustin or Lake Forest. That means many ADUs here are garage conversions or compact detached units tucked into side yards where a six-foot setback still works. The soil is generally stable – no big slope issues like you would see in parts of Anaheim Hills – but older neighborhoods like University Park and El Camino Real often need electrical panel upgrades because the original 100-amp service cannot carry an ADU plus the main house. Nearly every project we quote in Irvine involves a panel conversation, and we price it upfront so it does not show up as a surprise change order later.
Our Main Irvine Services
Most Irvine homeowners reach out about one of three projects: a full ADU build, a home addition, or a room addition. Each has its own dedicated Irvine page with pricing, timelines, and detail.
ADU Builders in Irvine
Building an ADU in Irvine means choosing between a site-built unit and a prefab panel system from brands like Abodu or Dvele. Prefab often works well in Irvine because the controlled factory build shortens on-site time, which matters when your HOA limits construction hours and noise. A detached ADU here typically needs a site survey, HOA design review, city permit, foundation work, utility runs, and a final inspection. We walk the setback rules, lot coverage limits, and height restrictions with you before you commit to anything. ADU Builders in Irvine covers the full scope, cost breakdowns, and timeline.
Home Addition Contractor in Irvine
A home addition in Irvine usually means expanding the footprint of your existing house, which triggers a different permit path than an ADU. These projects often involve matching rooflines and stucco texture so the addition looks like it was always there – a detail that Irvine HOAs care about deeply. We handle structural engineering, foundation matching, and the utility reroutes that older homes in neighborhoods like Northwood and Woodbridge frequently need. Home Addition Contractor in Irvine explains the process and pricing in detail.
Room Addition Contractor in Irvine
A room addition is the smaller cousin of a full home addition: one bedroom, a home office, a family room bump-out, or a primary suite extension. In Irvine, room additions frequently happen on second stories over an existing garage or as a rear bump-out that preserves the side yard. Matching architectural style matters in Irvine more than almost anywhere in the county, so we spend real time on window proportions, trim profiles, and paint matching. Room Addition Contractor in Irvine has the full breakdown.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Irvine
We build with and service ADU and addition projects using prefab systems and materials from Abodu, Cover, and Dvele, plus James Hardie cladding on site-built work. That gives Irvine homeowners a curated set of options they can research independently before making a decision. See our brands for the full roster and what each system does best.
Pricing for ADU Company in Irvine, CA
| Service | Typical range in Irvine |
|---|---|
| Detached ADU (site-built) | $200,000 – $380,000 |
| Detached ADU (prefab, e.g. Abodu or Dvele) | $180,000 – $320,000 |
| Garage conversion ADU | $95,000 – $180,000 |
| Attached ADU | $130,000 – $240,000 |
| JADU (junior ADU) | $80,000 – $140,000 |
| Above-garage ADU | $180,000 – $300,000 |
| Home addition (full scope) | $150,000 – $350,000 |
| Room addition (single room) | $70,000 – $140,000 |
| Primary suite addition | $90,000 – $180,000 |
| Second-story addition | $250,000 – $400,000+ |
| Prefab panel ADU kit + site work | $160,000 – $280,000 |
| Electrical panel upgrade (common in Irvine) | $3,500 – $6,500 |
Irvine pricing runs higher than surrounding cities for two reasons: HOA design standards often require premium exterior finishes, and older homes here regularly need panel upgrades or foundation work before an addition can start. With Benson ADU Builders, the price we write in your estimate is the price on your final invoice. No change orders, no scope creep, no surprises at the door.
Neighborhoods We Serve in Irvine
We run ADU and addition projects across Irvine, from the older villages to the newer north-side developments. Most initial site visits in the city happen within a few business days of your call.
- Woodbridge
- Northwood
- University Park
- Turtle Rock
- Westpark
Service Area – Cities Near Irvine
Benson ADU Builders covers Irvine and the surrounding cities. If you are a few minutes north or south and weighing an ADU or addition, we serve Tustin, CA, Santa Ana, CA, Orange, CA, and Lake Forest, CA as well. Scheduling and dispatch for the Irvine crew is coordinated from our Los Angeles office, with local teams running the jobs on the ground.
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 About ADU Company in Irvine
After you approve the written estimate, we typically begin design and permitting within one to two weeks. Irvine permitting timelines vary by village and HOA review schedule, so we will map out the expected sequence before you sign anything. Call (903) 568-7222 to get the ball rolling with a free estimate.
Yes, and they can slow a project down if you skip the design review step. We pull the CC&Rs for your village and submit the required exterior design package before we order materials, which keeps the schedule on track. It is one more reason we put every step in writing beforehand.
Every project comes with the 365-Day Done Right Promise: if anything is not done right within a full year, we make it right at no charge. It is a written guarantee stamped on every project we build in Irvine, not a verbal promise. Call (903) 568-7222 for a detailed scope and a written price before any work starts.
Ready to price your ADU or home addition in Irvine, CA? Call (903) 568-7222 for a free, written estimate. We will walk your lot, review HOA requirements, and hand you a line-item price you can take to the bank before any work begins.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Irvine Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
