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
Fielding ADU Builders handles accessory dwelling units, garage conversions, and room additions across Irvine, CA. What makes Irvine work distinct is the combination of planned neighborhoods, strict HOA oversight, and housing stock built mostly after 1970 – which means walls and slabs are generally predictable, but the permit path almost always runs through a homeowners association before it reaches the city. That changes how we sequence a project, and it changes what a realistic timeline looks like. Call (361) 315-4177 for a written estimate on any Irvine ADU or addition.
Why Irvine Homes Are Different
Irvine is a master-planned city. Most homes sit inside villages – Woodbridge, Woodbury, Northwood, Great Park, Turtle Rock, University Park – and nearly every village carries deed restrictions that govern what gets built in the side yard or over the garage. That is the first thing we check before pricing a job, because an HOA design review can add two to six weeks to a garage conversion or detached ADU, and it sometimes limits rooflines, exterior finishes, and window placement.
The housing stock itself runs from late-1960s single-story ranchers in older villages to 2015-and-newer Great Park builds. Older homes in Irvine tend to have slab foundations with post-tensioned cables, which matters for any room addition: we call for a private locate before cutting concrete, every time. Newer homes are tighter and usually more expensive to tie into because energy-title compliance rules are stricter now. Either way, Irvine’s flat terrain helps – most lots drain well and rarely need unusual foundation corrections for a standard ADU.
Summers run hot and dry. That affects exterior sequencing more than anything: stucco, paint, and caulk cure quickly from June to September, but August heat means we start roof work at dawn and keep hydration and shade on the crew. Rain is rare and concentrated between December and March, so weather delays in Irvine are uncommon compared to coastal or mountain markets.
Our Main Irvine Services
Most Irvine homeowners call us for one of three jobs: a room addition on an existing home, a garage conversion into living space, or a detached or attached ADU in the rear or side yard. Each follows its own permit path and carries its own price range in Irvine.
Room Addition Contractor in Irvine
A room addition in Irvine usually means extending a single-story home outward for a master suite, a family room, or a home office. On many Irvine lots, the side or rear setback leaves just enough room for an addition without a variance; when the lot is tighter, the city’s setback variance process takes a written application plus neighbor notification. We pull the permit, schedule inspections with the city, and match the new roofline to the existing house. The full breakdown for Irvine additions is on the service page: Room Addition Contractor in Irvine.
Garage Conversion Contractor in Irvine
Garage conversions in Irvine are the fastest way to add livable square footage without changing the home’s footprint. The work runs from floor replacement and drywall to a switched electrical panel, insulation, and a mini-split for cooling. In Irvine’s warm months, an unconditioned converted garage is not usable space – we size the HVAC for the actual room, not a guess from a chart. HOA approval is the gating step for most conversions, and we handle the submittal. The complete Irvine garage conversion cost and scope is here: Garage Conversion Contractor in Irvine.
ADU Builders in Irvine
A backyard ADU in Irvine is either a prefab unit set on a prepared foundation or a conventional stick-built unit, depending on lot depth and budget. Irvine’s side yards in many villages are narrow, so detached ADUs often sit behind the garage or in the rear corner where the setback still works. We run the lot survey, confirm HOA rules on exterior finishes, and build to California’s current ADU code. For pricing and build method comparisons on Irvine ADUs, see ADU Builders in Irvine.
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 install and finish prefab ADUs from Abodu, Cover, and Dvele in Irvine, along with conventional builds using James Hardie siding. When a homeowner already has a preferred platform, we handle the foundation, utility tie-ins, and interior finish so the unit goes in clean. See our brands for the full list.
Pricing for ADU Company in Irvine, CA
| Service | Typical range in Irvine |
|---|---|
| Detached ADU (prefab, 400 – 600 sq ft) | $185,000 – $260,000 |
| Detached ADU (conventional build, 600 – 800 sq ft) | $240,000 – $340,000 |
| Attached ADU (conversion of existing space) | $130,000 – $210,000 |
| Garage conversion (full living space, 400 sq ft) | $85,000 – $135,000 |
| Garage conversion (basic finish, no plumbing) | $50,000 – $75,000 |
| Room addition (400 sq ft, standard finish) | $150,000 – $220,000 |
| Room addition (master suite with bath) | $180,000 – $260,000 |
| Foundation work (new slab for ADU) | $18,000 – $34,000 |
| Utility tie-ins (sewer, water, electrical to ADU) | $12,000 – $28,000 |
| HOA design review submittal and revisions | $400 – $1,200 |
What pushes an Irvine price higher is HOA design review, post-tensioned slab locates on older homes, and any variance request the city requires for an unusual lot shape. What does not push it higher is surprise change orders – every Fielding ADU Builders job gets a written line-item price before work starts, and that number is the one on the final invoice.
Neighborhoods We Serve in Irvine
Our crews work throughout Irvine, from the older single-story sections of University Park to the newer Great Park and Portola Springs builds. Scheduling for an estimate visit lands within one to two business days in most Irvine villages.
- Woodbridge
- Woodbury
- Northwood
- Great Park
- Turtle Rock
Service Area – Cities Near Irvine
Fielding ADU Builders also covers the cities directly around Irvine. Homeowners in Tustin, CA, Santa Ana, CA, Orange, CA, and Lake Forest, CA can call the same number and get the same written-price-first process on an ADU or room addition.
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
We schedule estimate visits in Irvine within one to two business days of your call. A live person answers at (361) 315-4177, and the visit includes measurements, a lot review, and a written price quote you can hold in your hand.
An HOA cannot legally prohibit an ADU in California, but it can enforce design rules on exterior finishes, landscaping, and rooflines, and it can slow the project with review time. We prepare the HOA submittal and account for the review in the schedule so the timeline you approve is the timeline that holds.
We pull every permit for ADUs, garage conversions, and room additions in Irvine, and we call for and pass every required inspection. The permit work is part of the scope, not a separate fee that appears halfway through the job. Call (361) 315-4177 for a free estimate with the permit path spelled out in writing.
Fielding ADU Builders is an independently owned member of the Garrison Partners family, operating under The Garrison Code: show up in the window, price in writing, by the book, leave it clean, stand behind it for a year. Call home office line at (361) 315-4177 any hour, seven days a week – a live person picks up every time.
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
"Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B."Honest feedback on what the lot could fit. Told me up front what would fit on the lot and what the setbacks would allow."
- Rita C."Clear price breakdown. Change orders were all in writing."
- Hal P.
