ADU Company in Tustin, CA
An ADU in Tustin is a second, smaller home built on the same lot as your main house, and the cost to build one here typically lands between $180,000 and $350,000 for a detached unit, while garage conversions run $120,000 to $220,000 depending on the condition of the existing structure. Tustin is not a one-size-fits-all ADU market. Homes in Old Town were built between the 1920s and 1950s and carry electrical, plumbing, and historic-review realities that newer Tustin Legacy lots simply don’t have. That split changes timelines, budgets, and which brand of prefab ADU makes sense on your property. We’re Lodgewick ADU Builders, part of the Kingswell family of home-service companies since 2010, and every Tustin project we take on gets a written price before work begins and a written guarantee on the finished build. Call (254) 602-5618 for a free estimate, and you’ll get a real number, not a ballpark.
Why Tustin Homes Are Different
Most Orange County cities have one dominant housing era. Tustin runs two at the same time, and they require very different ADU approaches. In Old Town Tustin, the pre-war Craftsman bungalows and 1940s – 1960s California ranches look charming, but underneath they often have undersized electrical panels, galvanized supply lines, and side yards too narrow to squeeze a detached unit without design work. The city’s historic-overlay design-compatibility review adds a step most people don’t expect: a garage conversion that clears plan check in three to four weeks in a neighboring city can sit for 60 to 90 days in Old Town while window proportions, siding materials, and roofline pitch are reconciled with the surrounding street character. Then there’s Tustin Legacy, the massive redevelopment on the former Marine Corps Air Station site, where newer lots came out of the ground with infrastructure closer to ADU-ready. Tustin Ranch, built in the 1980s and 90s, sits in between: larger lots and modern panels, but HOA CC&Rs that, while largely pre-empted by state law on outright ADU bans, still hold sway over exterior finishes and rooflines. Summer afternoons inland in Tustin regularly reach the low-to-mid 90s, and Santa Ana wind events in fall pull moisture out of wood framing and exterior finishes fast, which is why detached ADUs here almost always need a dedicated mini-split system in the permit set rather than the ventilation-only approach that can pass closer to the coast. None of this is guesswork if you build in Tustin regularly. It’s the daily reality of the job.
Our Main Tustin Services
Most Tustin homeowners come to us for one of three projects, and each has its own page with local pricing, timelines, and Tustin-specific details.
Home Addition Contractor in Tustin
A home addition in Tustin is the way to go when you want more room attached to your existing footprint rather than a separate structure. On Tustin Ranch lots with room to expand, this often means a permitted master suite or family room addition that ties into the existing roofline. In Old Town, the math changes quickly: lot coverage limits, historic design review, and the condition of the original foundation all shape what’s buildable. We price additions with the same written-first approach as every Lodgewick project, and we handle the permit set, the design review package, and the build. Home Addition Contractor in Tustin
Garage Conversion Contractor in Tustin
A garage conversion turns an existing garage into living space, and in Tustin it’s often the most cost-effective ADU path because the shell already exists. The catch is that most Tustin garages were never built to be lived in. Old Town garages especially need full electrical panel upgrades, new plumbing runs, insulation, and often a raised floor to match the main house. Tustin’s historic-overlay review can add weeks to plan check depending on what street you’re on. We quote the conversion with those upgrades included up front, in writing, so the price doesn’t move once work starts. Garage Conversion Contractor in Tustin
ADU Builders in Tustin
For a detached ADU in Tustin, you’re deciding between site-built construction and a prefab unit from a manufacturer like Abodu, Cover, or Dvele, and the right answer depends on your lot. Old Town’s narrow side yards and historic streets often favor a compact prefab unit craned into place, while Tustin Legacy lots with wider setbacks can accommodate a larger site-built two-bedroom. We walk you through both options with real pricing for each, including the mini-split system Tustin’s inland climate demands. ADU Builders in Tustin
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 Tustin
We work directly with leading prefab ADU and materials brands including Abodu, Cover, Dvele, and James Hardie, and we match the brand to your lot, budget, and timeline rather than pushing one product on every job. Turnaround depends on the manufacturer’s production schedule, and we quote it straight when we price the project. See our brands for the full list.
Pricing for ADU Company in Tustin, CA
| Service | Typical range in Tustin |
|---|---|
| Detached ADU (1-bedroom, site-built) | $180,000 – $250,000 |
| Detached ADU (2-bedroom, site-built) | $250,000 – $350,000 |
| Prefab ADU (1-bedroom, including site work) | $160,000 – $230,000 |
| Prefab ADU (2-bedroom, including site work) | $220,000 – $300,000 |
| Garage conversion (attached, 1-bedroom) | $120,000 – $180,000 |
| Garage conversion (detached, full upgrade) | $140,000 – $220,000 |
| JADU (junior ADU, under 500 sq ft) | $90,000 – $150,000 |
| Electrical panel upgrade (Old Town, pre-1960s) | $3,500 – $6,500 |
| Mini-split HVAC for detached ADU | $5,000 – $9,000 |
| Foundation/utility trenching on new-build lot | $8,000 – $20,000 |
What pushes a Tustin ADU bill upward is almost always the existing conditions: a galvanized supply line that has to go, a panel from the Eisenhower administration, or a historic-overlay review cycle that burns two extra months of design time. We quote those costs up front, in writing, with the Lodgewick promise that the price we put on paper is the price you pay.
Neighborhoods We Serve in Tustin
We build across Tustin, from the historic streets of Old Town to the newer tracts of Tustin Legacy and the established Tustin Ranch community. Our crews know the difference between a 1920s Craftsman foundation and a 1990s slab, and we quote each one accordingly.
- Old Town Tustin
- Tustin Ranch
- Tustin Legacy
- North Tustin
- Columbus Square
Most Tustin projects move from first call to permit-ready drawings within two to four weeks, depending on whether historic review applies to your street.
Service Area – Cities Near Tustin
While this page is focused on Tustin, our crews also serve homeowners in nearby Santa Ana, CA, Orange, CA, Irvine, CA, and Costa Mesa, CA. Each city has its own permitting quirks, and we handle them all with the same written-price-first approach.
Serving Tustin, CA - Our Local Coverage Area
We’re based in the Tustin 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 Tustin
In Old Town Tustin, a project that would clear plan check in three to four weeks elsewhere can sit for 60 to 90 days while the city reconciles window proportions, siding materials, and roofline pitch with the surrounding pre-war streets. We build that timeline into the quote from day one. Call (254) 602-5618 to get a written estimate with a realistic schedule for your specific street.
State law largely pre-empts HOA bans on ADUs, but Tustin Ranch and Tustin Legacy HOAs can still regulate exterior materials, rooflines, and finishes. That’s a negotiation step most contractors in adjacent cities rarely face, and we handle it as a standard part of the permit package. Our estimate covers that work in writing before any construction starts.
Most projects move from first call to permit-ready drawings in two to four weeks, with historic-overlay parcels adding the review cycle on top. We schedule honestly, give you a defined arrival window for every phase, and a live person answers our phone 24/7 if you have questions mid-build. Call (254) 602-5618 for a free estimate and a written schedule. (254) 602-5618.
Call (254) 602-5618 today to schedule your free estimate. We’ll put the price in writing before any work begins, and the guarantee in writing before we leave.
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 Tustin Customers Say
"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt"Junior ADU conversion inside the house. They protected the rest of our place with plastic and daily cleanup. Done nearly on schedule and on the number they quoted."
- Sabrina Veld"Garage conversion into an office and guest room. Fair written price, finished close to on schedule, and they fixed a small drywall crack under warranty months later without any hassle."
- Diana Cho