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 or room addition in Irvine, CA means working with a city that has some of the strictest planning review in Orange County, plus HOAs that often have their own architectural committees. Sutton ADU Builders handles Irvine jobs with a written price before any work starts and a crew you can verify by name and photo before they ring your doorbell. Most Irvine homeowners first call us about a detached ADU or a primary-suite addition, and the right starting point depends on your lot dimensions and HOA covenants. Call (472) 248-8213 to talk through what fits your property.
Why Irvine Homes Are Different
Irvine’s housing stock is newer than most of Orange County, but that does not make additions simpler. Many homes in Woodbridge, Westpark, and Northwood were built on compact lots with rear-yard setbacks that leave less buildable space than a quick glance suggests. A setback (the required gap between your new structure and the property line) is often the first constraint we measure on an Irvine site visit, and it regularly determines whether a detached ADU fits or a garage conversion makes more sense.
The city’s planning division requires precise architectural drawings, and Irvine’s HOAs – among the most active in California – frequently demand their own plan review before the city sees anything. That sequencing adds time, not cost uncertainty. We build it into the schedule from day one. Irvine’s mild climate also means we can pour foundations and frame year-round, but the city’s clay-heavy soil in parts of the Great Park area sometimes requires deeper footings than your neighbor in Anaheim might need. Those are the details that change a bid, and they are exactly why we walk every Irvine lot before quoting.
Our Main Irvine Services
Irvine homeowners call us most about two things: adding square footage to the existing house and building a separate living unit on the lot. Each has its own Irvine page with full pricing and process details, linked below.
Home Addition Contractor in Irvine
A home addition in Irvine means expanding the footprint of your house, often a primary-suite wing or a larger kitchen-family room. The work requires structural engineering, city plan check, and usually HOA approval before framing begins. We have managed Irvine additions where the HOA required cladding sample boards before the city would even accept the submittal, and we handle that paperwork on your behalf. The details, including what a room addition costs per square foot in Irvine, sit on the dedicated page.
Home Addition Contractor in Irvine
ADU Builders in Irvine
ADUs in Irvine fall into two common buckets: a detached unit in the rear yard or a garage conversion that reuses the existing slab and roofline. Both paths have very different engineering and permit tracks, and the right answer usually comes down to your setback, lot slope, and whether your HOA allows a second structure at all. We have built both types across Irvine and can give you a plain comparison of cost and timeline after one site walk. Full pricing ranges are on the dedicated page.
Room Addition Contractor in Irvine
A room addition is the smaller sibling of a full home addition: one bedroom, one office, one bathroom added to the existing structure. In Irvine, room additions often trigger the same HOA review as larger builds but move through the city faster because the structural change is smaller. Many Irvine homeowners use a room addition to keep an aging parent close or to add a quiet office without touching the main living area. Costs and typical timelines are broken out on the page.
Room Addition Contractor 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 work with Abodu, Cover, and Dvele for Irvine homeowners who want a factory-built ADU with predictable lead times, and we stock the common site materials for those systems locally. See our brands for the full list and what each line handles best.
Pricing for ADU Company in Irvine, CA
These are honest, before-site-work ranges for the jobs Irvine homeowners ask us to price most often. Site conditions, HOA requirements, and your soil type can move the final number, but the written price we give you before work starts does not change unless you change the scope.
| Service | Typical range in Irvine |
|---|---|
| Detached ADU, 400 – 600 sq ft, standard finishes | $180,000 – $320,000 before site work |
| Detached ADU, 600 – 900 sq ft, mid-range finishes | $250,000 – $420,000 before site work |
| Garage conversion ADU, 300 – 500 sq ft | $110,000 – $220,000 before site work |
| Primary-suite addition, 250 – 400 sq ft | $120,000 – $260,000 |
| Single-room addition, 150 – 250 sq ft | $70,000 – $160,000 |
| Bathroom addition, 60 – 100 sq ft | $50,000 – $110,000 |
| Prefab ADU (Abodu, Cover, Dvele), model-dependent | $210,000 – $390,000 including site work |
| Site work only: grading, utilities, foundation, ADU-ready pad | $25,000 – $60,000 |
What pushes a price up in Irvine is usually HOA-required architectural review, deeper footings in clay soil, or a rear-yard setback so tight that a custom foundation design becomes necessary. We write your full price before any work starts, and the 365-Day Done Right Promise covers completed work for one full calendar year from project completion. Call (472) 248-8213 for an exact quote on your lot.
Neighborhoods We Serve in Irvine
We run ADU and addition jobs in every Irvine neighborhood. Response time for a site visit and written estimate is typically within a few days, depending on how many jobs are in progress.
- Woodbridge
- Westpark
- Northwood
- Great Park
- Turtle Rock
Service Area – Cities Near Irvine
Our Irvine crews also cover the surrounding cities where homeowners ask for the same written-price, verified-crew standard. See Tustin, CA, Santa Ana, CA, Orange, CA, and Lake Forest, CA for local details in each.
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
In most Irvine villages, yes. HOAs in Irvine have their own architectural committees that review plans before the city does, and some restrict detached ADUs entirely. We check your CC&Rs during the first site review and handle the HOA submittal along with the city permit package.
Plan for 9 to 14 months from first drawings to final inspection for a detached ADU, depending on HOA review speed and the city’s current plan-check backlog. A garage conversion often moves faster because the structure already exists. We lock your written price before the first permit goes in.
No. The written price we give you before any work begins is the price you pay unless you ask for a change to the scope. Change orders are written, priced, and approved by you first. The 365-Day Done Right Promise covers workmanship for a full calendar year after completion. Call (472) 248-8213 for a free estimate.
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
"Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R."Backyard ADU for my mother. The project manager showed ID and walked me through the permit steps, the foundation plan, and the schedule. Moved her in on time."
- Margaret C.
