ADU Contractor in Irvine
Irvine is the one city in our service area where the homeowners association, not the city, usually sets the timeline.
What ADUs look like in Irvine
Irvine is master-planned throughout, and the village associations — Woodbridge, Northwood, Turtle Rock, Portola Springs and the rest — enforce architectural standards that are stricter than the building code. Homes are newer than most of our LA-side work, garages are attached rather than detached, and rear yards on many village lots are modest. That combination pushes Irvine projects toward carefully sited detached units, JADUs inside the existing house, or conversions of attached garage space. The defining feature of an Irvine ADU is not the structure; it is matching the main house closely enough to clear village review.
Assume the design has to match the existing house in materials, roofing and colour. That is a cost, and it is not optional.
Three ways to add an ADU in Irvine
In Irvine the route you choose is largely a question of what your village association will approve, because the exterior is the part they have a view on. The interior conversions are correspondingly easier.
| Route | Suits an Irvine lot when | The catch |
|---|---|---|
| Detached new build | You have genuine rear yard, and your village will approve a second structure that reads consistently with the tract | The most visible option and therefore the most reviewed. Elevations, materials and colours all go to committee. Solar is required on new construction |
| Garage conversion | You have a garage you can give up and would rather change as little as possible on the outside | Most Irvine garages are attached, so this is usually an interior conversion with a new door and window — which is exactly the sort of exterior change committees scrutinise |
| Junior ADU inside the house | You want the shortest route through village review, because almost nothing changes outside | Capped at 500 square feet, and you lose a bedroom. Often the pragmatic answer in the stricter villages |
Woodbridge, Northwood, Turtle Rock, Portola Springs and the rest each enforce their own architectural standards, and they are not identical. The design that sails through one village can come back with comments in another. Detached ADU vs garage conversion covers the underlying trade.
What an ADU costs in Irvine
What moves a Irvine project inside our published ranges: Village design conditions push materials and roofing to match the main house rather than the cheapest compliant option — the most reliable cost driver in the city. In the hillside fire-zone villages, Chapter 7A construction and slope engineering apply on top. Village review itself typically adds two to four weeks before the city will issue a permit.
| ADU type | Typical all-in budget |
|---|---|
| Garage conversion | $100,000–$200,000 |
| Detached, about 500 sq ft | $180,000–$260,000 |
| Detached, 700–800 sq ft | $225,000–$350,000 |
| Detached, 1,000 sq ft | $300,000–$450,000+ |
These are typical Los Angeles budgeting estimates, not a price list or a quote. Your project can come in lower or higher depending on the house, the scope and the finishes; the only real number is a written proposal after a site visit.
Budgeting ranges, not quotes — see the full ADU cost breakdown.
How the permit process works in Irvine
Irvine adds a step most cities do not. Village architectural review comes first: elevations, materials and colours go to your village committee, which typically adds two to four weeks and must be cleared before the city will issue a permit. We then request the ADU Verification Form from the Planning Team and submit through IrvineReady, with the full document set — Development Standards Checklist, Hold Harmless Affidavit, owner and applicant affidavits, school fee and Transportation Corridor Agency forms, and the address application. The city checks completeness in about two business days and processing begins once the deposit is paid.
What we check on a Irvine lot first
- Which village association applies and what its architectural standards require
- Fire zone and slope
- The full IrvineReady document set, including the TCA and school fee forms
- The address application, which runs in parallel
That site walk is free, and it is deliberately where we tell people if a lot does not work.
How long an Irvine ADU takes, end to end
Irvine adds a step most cities do not, and it comes first. Village architectural review — elevations, materials, colours — typically adds two to four weeks and must be cleared before the city will issue a permit. Everything else follows from that.
| Phase | What happens | Typical |
|---|---|---|
| Feasibility | Site walk, and reading your specific village’s architectural standards before a line is drawn | 2–4 weeks |
| Design and engineering | Drawn to those standards deliberately, so review is a formality rather than a negotiation | 2–5 weeks |
| Village architectural review | Committee submission. Must clear before the city issues a permit | 2–4 weeks |
| City process | ADU Verification Form from the Planning Team, then plan check | 4–8 weeks |
| Construction and close-out | Build, inspections, utility connections, certificate of occupancy | 3–6 months plus 1–4 weeks |
Add the phases up and a detached unit runs roughly five to ten months from first conversation to keys, with an interior conversion at the short end. Irvine is the one city in our area where the association, not the city, usually sets the pace — which is good news, because association standards are knowable in advance in a way that plan check comments are not. How long an ADU takes covers the phases generally.
Edison, Irvine Ranch Water District, and your village
Irvine has no single municipal utility to coordinate with. Electricity is Southern California Edison, water is Irvine Ranch Water District, and your village association is a third approver with its own standards. Three organisations, three timetables, none of which will wait for the others.
- Edison service capacity and timing. A second dwelling with a kitchen, laundry, air conditioning and required solar is real load. Investor-owned utility service work runs on its own schedule, so it gets started early rather than when the framing is up.
- Irvine Ranch Water District connection. Separate organisation, separate process, same principle — start it in parallel.
- Village architectural standards. The one that most often decides the schedule. Read them before designing, not after the committee comes back.
Run all three together and Irvine is a predictable place to build. Run them in sequence and you will add two or three months to a project that did not need them.
Where we build
We build throughout Irvine and across Orange County — see everything we build in Irvine, nearby Anaheim, and our Orange County page, where several of our recent projects are.
ADU questions Irvine homeowners ask us
Can my Irvine village association stop my ADU?
No, but it can delay it. State law prevents an association from prohibiting an ADU, while village architectural review still has to be cleared before the city issues a permit — normally two to four weeks. We submit elevations, materials and colours to the village first for that reason.
Why does an Irvine ADU cost more than the same unit elsewhere?
Materials matching. Village standards generally require the ADU to match the main house in siding, roofing and colour, which rules out the cheapest compliant products. On a hillside village lot, Chapter 7A construction and slope engineering add more again.
Do you handle the permits in Irvine, or do I?
We do — design, engineering, submittal and every correction, dealing with the Irvine reviewers directly.
Can my village association refuse my ADU?
California law limits how far an association can obstruct an ADU, but it can enforce reasonable architectural standards, and in Irvine those standards are detailed and genuinely enforced. The practical answer is not to fight the committee but to design to its standards from the first sketch, so review confirms a design rather than reopening it.
Do all the villages have the same rules?
No, and that is the trap. Woodbridge, Northwood, Turtle Rock and Portola Springs each set their own standards on materials, colours and how a second structure should read. A design approved in one village is not automatically acceptable in another, which is why we read your specific village’s rules during feasibility rather than assuming an Irvine template.
What is the ADU Verification Form?
It is a step Irvine’s Planning Team requires as part of the city process, and it sits between village approval and plan check. Administratively straightforward, but it is another item with its own timing, and it belongs on the schedule from day one rather than being discovered in the middle.
Will you tell me if my lot is a bad candidate?
Yes, and the site walk is free so that we can. A village whose standards rule out what you want, a yard that cannot take a detached unit without crowding the house, an Edison service that needs work on Edison’s timetable — we would rather say so in the first two hours than take a deposit. You get a written proposal within 48 hours, and it either carries a real number or explains why we think you should not proceed.
Next steps
For what the code allows on your lot, see Irvine ADU rules or run the ADU rules calculator. For our scope, process and warranty, see ADU construction, garage conversions and how we run a project. Our garage-to-ADU conversion is photographed at every stage. Green Design and Build is CSLB #1110975, licensed, bonded and insured.