Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across Tustin
Finding a General Contractor who understands Tustin means knowing the difference between a city lot in the 92780 ZIP and an acreage property in unincorporated North Tustin. We’re Key Step Construction, and we handle both, from Old Town bungalow remodels to detached ADUs on county land off Red Hill Avenue. Our team knows which projects trigger city design review, which ones go through county permitting, and what it takes to keep a Tustin job moving without surprises. If you’re planning a remodel, addition, or ADU in Tustin, call (855) 382-0824 for a free estimate.
Key Takeaways:
- Tustin spans three ZIP codes (92780, 92781, 92782) and includes both city and unincorporated county land, which changes how permits and setbacks work.
- Building on the former MCAS Tustin base adds environmental review and potential buried-infrastructure issues that typical Orange County lots never see.
- Our pricing for major projects in Tustin runs from roughly $30,000 for a garage conversion to $220,000 for a full ADU build, and we scope acreage factors like haul distance and drainage before quoting.
- One contractor handles the whole job, from grading and foundation through finishes, on one contract.
Why Key Step Construction Is Tustin’s Preferred General Contractor Company
Homeowners across Tustin call us when they want a single contractor accountable for the entire scope. Noel Garrity leads our team, and the way we run projects reflects that: one point of contact, one contract, one schedule. Tustin’s housing stock demands that kind of coordination. A 1920s bungalow off Main Street in Old Town can require seismic retrofitting, foundation work, and a full interior remodel all at once. A newer home in Tustin Legacy might need a kitchen overhaul and exterior siding replacement on the same timeline. Most contractors pick one trade and hand off the rest. We don’t.
We work throughout Tustin regularly, so we know the inspection quirks, the historic review process, and which suppliers stock what we need without a two-week wait. That local knowledge shows up in the estimate, not just on the job site. Our Tustin customers tell us the same thing: the plan we promised at the start is the plan that got built.
Styles & brands we work with
- Kitchen remodeling
- Bathroom remodeling
- Home additions & ADU
- Roofing
- Windows & doors
- Driveway & pavers
- Fence
General Contractor Services in Tustin
General Contractor Services in Tustin cover full-scope project management and construction across interior and exterior work. Whether you’re adding a primary suite to a ranch-style home off Red Hill Avenue or gutting a kitchen in Tustin Legacy, we handle permits, materials, trades, and the final walk-through. The point is that you don’t coordinate five different crews. You call us, and we run the job.
Remodeling and Renovation Scope
Kitchen remodels in Tustin typically run $14,000 to $45,000. Bathroom remodels start around $9,000 and can reach $28,000 depending on layout changes and finish selections. We carry access to cabinet lines like KraftMaid and Wellborn, countertop brands including Cambria and Silestone, and plumbing fixtures from Grohe and Toto. That means you’re not locked into whatever one supplier has on the shelf.
Additions and Detached Structures
Room additions in Tustin run $45,000 to $130,000. The final number depends on foundation work, roofline integration, and whether you’re building up or out. On acreage lots, we also scope site access, material staging, and drainage before we quote. That keeps the estimate honest instead of optimistic.
Construction Company in Tustin
As a Construction Company serving Tustin, we take full accountability from the first site walk to the final inspection. Homeowners reach out to us when a project spans multiple trades and they don’t want to babysit subcontractors. We manage the schedule, the materials, the permits, and the quality control across every system of the home.
Whole-Home and Major Renovation Projects
Whole-home remodels on Tustin’s older housing stock often start with structural work. The pre-1950s homes in the 92780 ZIP frequently have unreinforced masonry chimneys and cripple walls that must be addressed before cosmetic work begins. We factor that into the estimate from day one. Roof replacement on these homes runs $8,000 to $20,000, and window replacement typically falls between $4,500 and $15,000.
Exterior and Site Work
Exterior scopes in Tustin include roofing, siding, windows, fencing, and hardscaping. We’re aligned with GAF, CertainTeed, and Owens Corning for roofing, James Hardie for siding, and Belgard and Techo-Bloc for pavers. For a paver driveway in Tustin, expect $7,000 to $18,000. Vinyl fencing runs $3,500 to $9,000. These projects fall under the same contract as an interior remodel when we manage both, which eliminates the finger-pointing that happens when two contractors split a scope.
Trusted Brands We Service in Tustin
We spec materials from brands that carry real manufacturer warranties, and we install them to the manufacturer’s requirements. That matters in Tustin’s hot, dry summers and wet winters, where a poorly detailed window flashing or shower waterproofing failure shows up within a year. We use Schluter systems for tile and waterproofing, and we source fixtures from Grohe and Toto for clients who want durable, serviceable components rather than builder-grade filler. For exterior work, James Hardie siding and GAF roofing systems hold up to Tustin’s sun exposure and occasional heavy rain. The brand matters because it tells you what to expect in year ten, not just at handoff.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Tustin Homes
- Unincorporated county land confusion: Homes in unincorporated North Tustin fall under county jurisdiction, not city of Tustin permitting. A contractor who assumes city rules applies the wrong setbacks for wells and septic systems, and the correction costs weeks, not days. We verify jurisdiction before we draw anything.
- Old Town seismic surprises: A simple kitchen remodel in Old Town often triggers a full seismic retrofit once the walls are open. The 1920s bungalows were built with cripple walls and unreinforced chimneys that don’t meet current code. We plan for that before demolition starts.
- Tustin Legacy buried infrastructure: Ground disturbance on the former MCAS Tustin site can uncover old taxiway concrete, abandoned utility lines, or contaminated soil that requires Navy environmental review. This doesn’t happen on a standard Orange County lot, but it happens here, and it changes the budget and timeline if you didn’t plan for it.
- Drainage on slab-on-grade homes: Many mid-century Tustin homes sit on slab foundations without modern water management. Heavy winter rain pools against the structure, and any addition or outbuilding needs a grading plan that directs water away. Skipping that step fails final inspection.
Pricing for General Contractor in Tustin, CA
Major project pricing in Tustin breaks down into clear ranges. The numbers below reflect what we see across the city’s housing stock and lot types.
| Project | Tustin Price Range |
|---|---|
| ADU Construction | $90,000 – $220,000 |
| Home Addition | $45,000 – $130,000 |
| Garage Conversion | $30,000 – $80,000 |
What moves a project toward the top of that range? Acreage sites with long material hauls, well and septic setback complications, and grading work. A detached ADU on a flat city lot in the 92782 ZIP costs less than the same structure on a sloped half-acre in North Tustin that needs 150 feet of site access, drainage recontouring, and a concrete truck scheduled around a narrow easement. We scope those factors in the estimate, not as a change order later. Call (855) 382-0824 to schedule a free estimate, and we’ll walk the site with you before we put numbers on paper.
We Also Serve Cities Near Tustin
Beyond Tustin, we work throughout the surrounding Orange County area: North Tustin, Santa Ana, Irvine, and Orange. If you’re in one of those communities and planning a remodel, addition, or ADU, our general contractor team covers the same full-scope approach there. One contractor, one contract, no fragmentation.
Serving Tustin, CA - Our Local Coverage Area
We serve Tustin and nearby communities. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
FAQs About General Contractor in Tustin
If your property sits outside incorporated Tustin city limits, you need county permits, not city permits. That means county building and safety review, county well and septic setback requirements, and county grading standards. We confirm jurisdiction before we design anything, because the wrong assumption costs you weeks and a re-drawn plan. Call (855) 382-0824 and we’ll verify your parcel’s jurisdiction on the first call.
Building on acreage adds site-specific costs that a standard city lot never has: longer material hauls from the street to the build site, equipment access constraints, well and septic setbacks, and grading and drainage plans for stormwater flow. A detached ADU on a flat Tustin city lot might run $90,000 to $150,000, while the same structure on a sloped county parcel with a 150-foot haul and no established driveway can push toward $220,000. We scope these factors before quoting so the number you see is the number you build to.
Any ground disturbance on the former air base can uncover buried taxiway concrete, abandoned utility lines, or contaminated soil that triggers Navy environmental review. That adds time and cost, and you can’t wave it away with a city variance. We’ve worked through this in the Legacy area, and we budget for investigation and coordination up front so the discovery doesn’t stop the project cold.
Yes. The pre-1950s homes in Old Town often require cripple wall bracing, foundation bolting, and chimney reinforcement once we open the walls. We plan the retrofit into the remodel scope from the beginning so it’s not a surprise change order. The work gets permitted, inspected, and documented like the rest of the job.
We write allowances for materials and site conditions into the contract before work starts. If we uncover something unexpected, like buried concrete or a bad drainage pattern, we document it, show you the cost impact, and get your approval before we proceed. No change order happens without a signed line item. That’s how we keep a Tustin acreage project on schedule and on budget.
Written by Noel Garrity, Owner at Key Step Construction, serving Tustin and the surrounding Orange County area.