Fast, Reliable Home Addition Contractor Across Gardena
A room addition in Gardena typically runs $180 – $420 per square foot depending on scope, foundation work, and what your existing walls reveal once they’re open. For a standard 400-square-foot master suite or two-room addition, most Gardena homeowners spend between $72,000 and $168,000, with accessible in-law suites for aging parents landing on the higher end. We coordinate every Gardena project from our Los Angeles office and keep crews local, so you’re never waiting on someone from across the county. Call (254) 602-5618 to schedule a free walkthrough and get a written price before any work begins.
We know Gardena’s housing stock better than most contractors who drop in from the beach cities. The postwar wood-frame stucco homes that dominate this city were built between the mid-1940s and mid-1960s, and they hide things. Knob-and-tube wiring, undersized subpanels, slab-on-grade footings that were poured before modern seismic codes. A contractor who prices your addition off the original floor plan without opening a single wall is guessing. We don’t guess with your money.
Why Lodgewick ADU Builders Is Gardena’s Preferred Home Addition Contractor Company
Russ Delmar leads our Gardena projects, and he’s spent years walking lots from Rosecrans to Redondo Beach Boulevard, from the Gardena Freeway corridor to the blocks around Freeman Park. That matters when your addition has to fit a 5,000-square-foot lot with a rear alley and a detached garage that’s been there since Eisenhower was president. We’ve done this work in Gardena enough to know which blocks have alley access, which homes still have their original 60-amp panels, and which additions will trigger a full electrical service upgrade.
Our Gardena customers get the same thing every Lodgewick projects gets: a written price before work starts, a defined arrival window, a clean job site, and The Kingswell Guarantee in writing, including the 365-Day Done Right Promise. If something isn’t right, we come back and make it right. No phone tag, no “we’ll get to it next month.”
Every crew member on a Gardena job is background-checked and uniformed, so you always know who’s on your property. And when you call our number, a live person answers, 24/7. Not a voicemail loop, not an answering service that takes a message and loses it. If you have a question about your build or your guarantee at 9:30 on a Tuesday night, someone picks up.
Bathroom Addition Contractor in Gardena
A Bathroom Addition Contractor in Gardena handles the full build-out of a new bath where one didn’t exist, whether it’s part of a primary suite addition, an in-law unit for aging parents, or a ground-floor bath that makes an older home livable without stairs. In postwar Gardena homes, these jobs almost always mean opening walls and running new supply and drain lines through slab-on-grade foundations, which is exactly where the age of the structure starts to matter.
Bathroom additions in Gardena typically run $28,000 – $55,000 for a full bath with standard finishes, and $40,000 – $70,000 when accessibility features are built in from the start. That range reflects what we actually see on the ground here: cast-iron drain pipes from the 1950s, subfloors that need reinforcement, and the occasional discovery that the water heater on the other side of the wall needs to move.
Writing the Price Before the Waterproofing Starts
The biggest reason bathroom addition quotes move in Gardena is failed waterproofing and hidden plumbing damage. We handle it with an inspection-first process: we open the wall, photograph what we find, and price any necessary repair as a written line-item change order before we proceed. You never hear about a rotted subfloor as a verbal surprise mid-demo.
Accessible Wet Rooms Without the Institutional Look
More Gardena bathroom additions than we can count are built for parents moving back in with their adult children. That means ofuro-compatible wet rooms with step-free entries, curbless shower pans, blocking in the walls for future grab bars, and door swings that don’t trap a walker. It’s the kind of thing that gets discussed in Gardena kitchens constantly, and almost never a few miles west in the beach cities.
Bedroom Addition Contractor in Gardena
A Bedroom Addition Contractor in Gardena builds the extra sleeping and living space your family has outgrown, whether that’s a ground-floor bedroom suite for grandparents, a second-story primary suite above a postwar bungalow, or a two-room addition that turns a 2-bedroom house into a 4-bedroom house. On Gardena’s 5,000 to 7,500-square-foot lots, these additions typically push out into the rear yard or go up, depending on setbacks and what the city will approve.
Bedroom additions in Gardena typically run $45,000 – $95,000 for a single ground-floor bedroom with a closet, and $80,000 – $160,000 when you include a bath, a sitting area, and accessible design elements. The wide range isn’t a hedge, it’s the honest spread between a simple bump-out on a newer foundation and a rear addition on a 1950s slab where the electrical panel has to be upgraded from 60 to 200 amps.
What Opening the Wall Actually Reveals
On a postwar wood-frame stucco house near 168th Street and Denker Avenue in central Gardena, our crew opened a rear wall for a two-room addition and found knob-and-tube remnants spliced into a 60-amp subpanel feeding an original detached one-car garage, plus slab-on-grade footings sitting above the frost line our structural plan assumed. We stopped, sent the homeowner photos and a written change order the same day, and priced the service upgrade and footing revision as line items before anyone picked up a hammer again. No verbal “we’ll sort it out later.”
Planning for the Second Story Before the First One Falls Apart
Second-story additions on 1950s Gardena homes almost always require shear-wall retrofits and foundation review below, because the original framing wasn’t designed to carry another floor. We price that work into the bid before we start, not after the first-floor ceiling is open and the engineer shakes his head.
Trusted Brands We Service in Gardena
For Gardena homeowners exploring prefab ADUs and factory-built additions, we work hands-on with Abodu, Cover, Dvele, and James Hardie siding and trim. Each one fits a different kind of lot and budget: Abodu works well for rear-alley lots where a crane can drop a unit into place, Cover’s panelized system suits tight central Gardena yards, and Dvele makes sense for homeowners who want a high-performance shell without a dozen on-site trades. We keep local material availability in mind when we spec, so you’re not waiting six weeks on a backordered window that nobody checked on.
Common Home Addition Contractor Problems We See in Gardena Homes
- Knob-and-tube wiring hidden behind plaster walls. It’s still live in a surprising number of central and north Gardena homes, and it’s a code violation the moment you open a wall for an addition. We price the remediation as a written line item, not a “surprise” at demo.
- 60-amp subpanels that can’t carry a new bedroom and bath. The original detached one-car garage on a 1950s lot wasn’t designed to power a modern living space. Undersized panels happen constantly in Gardena, and the fix is a service upgrade priced in writing before work starts.
- Slab-on-grade footings that don’t match modern structural assumptions. If your addition is planned off the original floor plan but nobody checked the actual footing depth, the plan is wrong. We verify before we bid, because the alternative is a change order that should have been in the contract.
- Ignoring the rear alley and building where you didn’t need to. Many north and central Gardena blocks have rear alleys that allow direct access to a detached ADU or addition without running equipment through the front yard. Contractors who skip that review leave buildable square footage on the table.
Pricing for Home Addition Contractor in Gardena, CA
Here’s the straight answer, because you should never have to call just to get a ballpark. A simple bump-out addition in Gardena runs $165 – $250 per square foot. A standard room addition with a bath runs $220 – $380 per square foot. Accessible in-law suites with step-free entries, curbless showers, and ofuro-compatible wet rooms typically run $280 – $420 per square foot because the accessibility features are built in, not retrofitted later. What moves the number in Gardena is what’s behind the walls: knob-and-tube remediation, panel upgrades, footing work, and sewer line replacement all add cost, and we price them in writing as line items before we start. Call (254) 602-5618 for a free walkthrough and a written price that won’t change at the door.
We Also Serve Cities Near Gardena
Our crews work in Gardena every week, and we also serve homeowners in Home Addition Contractor in Gardena neighboring communities: Lawndale, Hawthorne, Compton, and Torrance. If you’re a few blocks outside the city line, call (254) 602-5618 and ask, chances are we’re already working within a mile of you. For the full scope of what we handle, see our Home Addition Contractor services page.
Serving Gardena, CA - Our Local Coverage Area
We’re based in the Gardena 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 Gardena
Yes. We open the walls before we write the final number, because pricing a 1950s Gardena wood-frame house off the original floor plan is how changed-quote horror stories happen. We do a structural and electrical inspection first, photograph everything we find, and write any necessary work, like knob-and-tube remediation or a subpanel upgrade, into the contract as a line item. You’ll see the number in writing before we touch a hammer. Call (254) 602-5618 to schedule a walkthrough, the inspection and estimate are free.
It can absolutely become an ADU, and in Gardena it’s often the most cost-accessible path to extra living space. The age of the structure matters less than what’s inside it: we check the footing depth, the electrical service, the roof condition, and whether the slab was poured over the original garage floor or properly thickened. Many original Gardena garages convert beautifully once the subpanel is upgraded and the walls are insulated. Call (254) 602-5618 and we’ll tell you whether your specific garage is a good conversion candidate.
Plan for step-free entries at every exterior door, a curbless shower with blocking for grab bars, 36-inch doorways, and door orientation toward the main house so your parents can move between the spaces without going outside. If your family follows Japanese bathing traditions, an ofuro-compatible wet room is very common in Gardena additions, and it’s far cheaper to build correctly the first time than to retrofit later. We spec these features into the original bid, not as an afterthought.
Yes, and it’s one of the most overlooked details in South Bay ADU construction. Gardena sits about four miles inland, far enough that the marine layer doesn’t cool it the way it cools Manhattan Beach or Hermosa Beach, and summer afternoons routinely run 5 to 8 degrees warmer. We size attic ventilation and passive cooling for Gardena’s actual climate, not a coastal assumption, because an underbuilt unit will cook in August and you’ll be the one calling about it. Call (254) 602-5618 for a quote that accounts for it up front.
In many north and central Gardena neighborhoods, yes. A significant portion of the older residential grid includes rear alleys, which means your detached ADU can be accessed directly from the alley without disrupting front-yard setbacks or reconfiguring your driveway. We check alley access on every Gardena lot before we plan, because skipping that review either kills a buildable project or forces a driveway change that was never necessary. Call (254) 602-5618 and we’ll confirm whether your block has alley access.
Get Your Gardena Home Addition Priced in Writing
If you’re ready to add space to your Gardena home, the next step is a free walkthrough and a written price. Russ Delmar and the crew know Gardena’s postwar homes, its rear alleys, its aging subpanels, and its multigenerational families better than any contractor dropping in from the coast. You’ll get a real number, a defined arrival window, and The Kingswell Guarantee in writing before work starts. Call (254) 602-5618 today to schedule your free estimate, and let’s talk about what your house is actually hiding.
Written by Russ Delmar, Owner at Lodgewick ADU Builders, serving Gardena since 2010.