A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Santa Ana
Adding a room, a second story, or converting a detached garage into livable space in Santa Ana comes with one recurring question from homeowners: what happens when we open the walls? The honest answer is that in a city where most single family homes were built before 1970, you’ll likely find outdated wiring, cast iron drain lines, or framing that no longer meets current code. We’re Lodgewick ADU Orange County, and as a Home Addition Contractor serving Santa Ana, we plan for those discoveries before we ever swing a hammer. We write allowances into every contract, so when a wall opens and the electrician says “this has to go,” you already know how it gets paid for. Call us at (350) 203-6060 and we’ll walk you through what a Santa Ana addition realistically costs and how we keep surprises contained.
Why Lodgewick ADU Orange County Is Santa Ana’s Preferred Home Addition Contractor Company
Homeowners in Santa Ana have seen their share of contractors who give a low number, start the job, then reappear with a change order the size of a second mortgage. Our whole process was built as the opposite of that. Before any work starts, you get a written price. Not a range, not a “we’ll see.” A number. And the 365-Day Done Right Promise means if something isn’t right after the job is finished, we come back and fix it. That promise is delivered in writing on every project we do in Santa Ana.
We’ve worked on homes in the Washington Square neighborhood, where a 1920s bungalow on West 19th Street taught us more about knob and tube wiring than any code book. When our tech opened the rear garage, the rafters still carried live knob and tube, and a sill plate had rotted through from decades of irrigation overspray. The permit triggered full electrical replacement and shear wall upgrades. Because we had already written an allowance for hidden conditions, the homeowner approved the extra work in writing before any drywall came off the truck. That’s how The Kingswell Way works: say the price before the work, show up in the window given, put the guarantee in writing, and come back if it fails.
Each Lodgewick location is independently owned and operated. Our Orange County operation coordinates dispatch and scheduling from the brand’s Los Angeles office, but the crews who build in Santa Ana live and work here. They know which inspectors ask for shear wall nailing patterns and which neighborhoods require alley-facing entrances on garage conversions. That local knowledge shows up in the plans and the paperwork, not just the conversation.
Garage Addition Contractors in Santa Ana
Garage Addition Contractors in Santa Ana do more than hang drywall and pour a slab. The job here means working with a housing stock dominated by pre-1970s single family homes, many with detached garages accessed by rear alleys on lots between 5,000 and 7,000 square feet. Converting that garage into living space often means adding a second entrance from the alley while the street frontage stays unchanged, a condition city inspectors know well and check for. A typical garage conversion in Santa Ana runs $140 to $260 per square foot. That includes foundation work, electrical upgrades, insulation, drywall, flooring, and the permit drawings.
We’ve also learned that Santa Ana’s mild Mediterranean climate means slab-on-grade construction works beautifully here. The ground doesn’t freeze, so a simple thickened-edge slab handles the load without deep footings. The Santa Ana winds, though, bring hot and dry spells, so we spec passive cooling and drought-tolerant planting strips around the new structure.
Alley-access garage conversions
In Washington Square, the detached garage pattern behind the house creates a natural second unit. We frame the new entrance to face the alley, leave the original front elevation untouched, and the plan sails through plan check. Miss that alley entrance requirement and the project can get red-tagged at final inspection.
Pre-approved ADU plan library
Santa Ana maintains a library of pre-approved accessory dwelling unit plans. For a straightforward garage conversion, using one of those off-the-shelf designs can cut months from the permitting timeline. A contractor who isn’t familiar with that library might submit custom plans and watch the calendar slip while a pre-approved design would have been accepted in weeks.
Bathroom Addition Contractor in Santa Ana
A Bathroom Addition Contractor in Santa Ana lives with the reality of cast iron drain lines and galvanized supply pipes. When you add a bathroom to an existing home, or into a converted garage ADU, the plumbing connection is often the most underestimated cost. In a city where the housing stock predates the 1970s, opening an exterior wall frequently uncovers ungrounded cloth wiring and deteriorated cast iron. We write allowances for exactly these conditions, so a $35,000 bathroom addition doesn’t turn into a $50,000 surprise. A typical bathroom addition in Santa Ana runs $28,000 to $55,000, depending on whether you’re tying into an existing stack or running new sewer line to the street.
When the addition is part of a detached garage ADU, the sewer connection matters even more. If the main house still runs on old cast iron, we camera the line before we price the job. Replacing a section now is far cheaper than opening a finished bathroom floor later.
Waterproofing for Santa Ana winds
Warm and dry doesn’t mean waterproofing is optional. A bathroom with a shower needs proper membrane behind tile and a vent fan rated for continuous moisture. The Santa Ana winds drive dust and heat, but showers still create humidity. We flash penetrations and use cement board behind every wet wall, whether the building is a 1920s bungalow or a brand new pre-approved ADU.
Tying into old cast iron
Santa Ana’s older homes are full of cast iron drain pipe that has had 60 or 70 years to corrode. Adding a bathroom means breaking into that stack. We inspect it first, price the tie in honestly, and if the line has failed, the replacement is written into the change order. At final inspection, everything drains and nothing leaks.
Trusted Brands We Service in Santa Ana
We work with prefab and panelized ADU systems from Abodu, Cover, and Dvele, and we carry the local parts and materials Santa Ana homeowners need for those systems. A panelized wall system from Cover goes up fast, but it still needs a properly flashed foundation and a weather-tight roof connection. We’ve built enough of these in Santa Ana to know how the manufacturers expect their systems installed, which keeps the manufacturer’s warranty valid and the city inspector happy. When you call us, the person who answers knows what a Dvele panel is and why its wall assembly differs from a stick-framed addition. That matters when you’re comparing bids.
Common Home Addition Contractor Problems We See in Santa Ana Homes
- Unpermitted prior work. Santa Ana inspectors routinely flag unpermitted garage conversions in Washington Square by checking for a second alley-facing entrance. If someone converted a garage without pulling permits, we may need to peel back drywall to expose framing and electrical before the city will sign off on new work.
- Ungrounded cloth wiring. Homes built before 1970 often still carry two-wire cloth-insulated electrical. Opening a wall for an addition means that circuit must be brought to current code. We write the allowance so you know the number before the wire is pulled.
- Rotted sill plates. Decades of irrigation overspray against a foundation wall can rot the wood sill plate where the wall meets the concrete. We check this on every Santa Ana addition, because a rotted sill means reframing the bottom of the wall, not just patching.
- Submitting custom plans when a pre-approved plan would do. Santa Ana’s pre-approved ADU plan library exists to speed up garage conversions. A contractor who ignores it can add months to a project. We check the library first, and only go custom when the lot or the design genuinely requires it.
Pricing for Home Addition Contractor in Santa Ana, CA
Here’s where we give you the real numbers, because you shouldn’t have to call just to get a ballpark. A room addition in Santa Ana typically runs $180 to $320 per square foot, finished. Second story additions run higher, $250 to $400 per square foot, because of the structural work involved in carrying the load. A sunroom addition lands between $120 and $250 per square foot depending on glazing. Bathroom additions run $28,000 to $55,000. A detached garage conversion to an ADU commonly runs $140 to $260 per square foot. The range depends on what’s inside the walls: electrical age, foundation condition, sewer line health, and which pre-approved plan fits. We always provide a written price before any work starts. Call (350) 203-6060 for a free estimate specific to your Santa Ana lot.
We Also Serve Cities Near Santa Ana
If you’re outside Santa Ana proper, we also serve Tustin, Costa Mesa, Midway City, and Anaheim. The same Santa Ana team handles these surrounding cities, which means you get the same written pricing, the same guarantee, and the same familiarity with Orange County’s older housing stock and local inspectors. Wherever you are in the area, call (350) 203-6060 and a live person answers.
Serving Santa Ana, CA - Our Local Coverage Area
We’re based in the Santa Ana 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 Home Addition Contractor in Santa Ana
Yes, in most cases. In Santa Ana’s Washington Square neighborhood, detached garages are traditionally accessed from the rear alley. The city’s planning department expects a converted garage ADU to maintain a second entrance from the alley, so the original street frontage stays unchanged. We’ve seen inspectors check for exactly this at final inspection, and missing it can red-tag the project. If you’re considering a Washington Square garage conversion, call (350) 203-6060 and we’ll confirm what your specific lot requires.
They can cut months off the process. Santa Ana maintains a library of pre-approved accessory dwelling unit plans that have already cleared plan check. If your garage conversion or backyard cottage matches one of those designs, the city reviews it much faster than a custom submittal. We check the pre-approved library before we start drawings. For details on your lot, call (350) 203-6060, and our team will tell you whether a pre-approved plan fits.
In Santa Ana’s pre-1970s housing stock, opening an exterior wall typically triggers electrical upgrades on any circuits in that wall. If the home still has ungrounded cloth wiring, that circuit must be brought to current code. The wall may also need shear wall upgrades if it is a braced wall line. These are not optional, but they shouldn’t be surprises either. We write allowances for exactly these conditions before the hammer comes out. Call (350) 203-6060 and we’ll walk through your house’s age and what to expect.
You can, but the sewer connection deserves careful inspection first. In Santa Ana, many pre-1970s homes still have cast iron drain lines that have been corroding for decades. Tying a new bathroom into a failing line means the inspector may require a partial or full replacement before sign-off. We camera the existing line before we price the job, and the replacement, if needed, is written into a change order you approve before work starts. Call (350) 203-6060 for a free estimate on your specific connection.
It affects the exterior detailing more than the wet-wall waterproofing. Santa Ana’s hot, dry wind events mean we pay close attention to flashing at penetrations and the roof-to-wall connection, because driven dust and heat can expose a bad seal quickly. Inside the bathroom, the waterproofing is standard but non-negotiable: cement board behind every wet wall and a properly vented fan for shower humidity. If you’re planning an ADU bathroom addition and want the details on your specific wall assembly, call (350) 203-6060.
Get Your Free Santa Ana Home Addition Estimate
If you’ve read this far, you probably have a specific project in mind: a garage conversion off the alley, a second bathroom, a bedroom bump-out for a growing family. You also probably want a real number. Call us at (350) 203-6060. The person who picks up is a live human being who works on Santa Ana addition projects, not a call center. We’ll schedule a walkthrough, check your lot, look at your existing panel, and give you a written price before any work begins. Every project carries the 365-Day Done Right Promise, in writing. That’s a guarantee from Lodgewick ADU Orange County, led by Russ Delmar, serving Santa Ana and nearby Orange County cities.
Written by Russ Delmar, Owner at Lodgewick ADU Orange County, serving Santa Ana since the company’s founding in 2010.
