Fast, Reliable Home Addition Contractor Across San Gabriel
Home additions in San Gabriel typically run between $85,000 and $240,000 depending on square footage, foundation work, and the condition of your existing structure. We’re Lodgewick ADU Builders, the ADU company of the Kingswell family, and we’ve been navigating San Gabriel’s specific permitting and construction landscape since 2010. If you’re planning a room addition, second story, or bathroom expansion in San Gabriel, call (254) 602-5618 for a free estimate with a written price before any work starts.
Most San Gabriel homes were built between the late 1940s and the 1960s, and opening up those walls reveals things you can’t see from the curb. Our Home Addition Contractor team knows what lives inside these post-war houses: 100-amp panels, galvanized supply lines, and framing that predates modern seismic code. We plan for that reality before we give you a number.
Why Lodgewick ADU Builders Is San Gabriel’s Preferred Home Addition Contractor Company
Our reputation in San Gabriel comes from doing what we say we’ll do. Every project starts with The Kingswell Guarantee: a written price before work begins, a defined arrival window, a clean job site, and a written guarantee on every job. If the work fails within 365 days, we come back and make it right, free of charge. That’s the 365-Day Done Right Promise, and it’s in writing on every San Gabriel project we touch.
Homeowners across San Gabriel, from the neighborhoods around Smith Park to the blocks off Valley Boulevard, have had the same experience with us: a live person answers the phone 24/7, the crew shows up in the window we gave you, and the price we wrote down is the price you pay. No change orders at the door, no “we found something” phone calls that double the bill. When surprises surface, we pause, write allowances into the contract, and get your written approval before spending another dollar.
Russ Delmar, who leads our San Gabriel crews, has spent years working with the city’s Building and Safety Division on alley-lot setbacks, panel upgrade requirements, and the specific plan-check quirks these older R-1 lots throw at you. That local fluency is why San Gabriel homeowners call us when they want the addition done without a permit stall.
Serving San Gabriel means knowing that your garage was probably built right up to the alley property line, that your panel is probably original to the Eisenhower administration, and that your family may need a full second kitchen, not a kitchenette. Those aren’t guesses. That’s what we see here week after week.
Bathroom Addition Contractor in San Gabriel
A Bathroom Addition Contractor in San Gabriel faces a specific challenge: adding a full bath to a 1950s home means tying into galvanized supply lines that are likely weeping at the joints and running new drainage through a slab that was poured before modern plumbing code existed. A typical bathroom addition in San Gabriel runs $28,000 to $65,000, with the spread driven by whether the new bath sits over a crawlspace (easier, cheaper) or on a slab (cutting required, more expensive).
Slab-Cut Bath Additions
Most San Gabriel additions that need a new bathroom on the ground floor involve cutting into the existing slab to run waste lines. That’s not a surprise we spring on you mid-project; we inspect first, write the allowance into your contract, and price it before we pour anything. Expect slab work to add $4,000 to $9,000 to your bathroom addition depending on trench length.
Upstairs Bathroom Additions
If your second story addition includes a bathroom, the math changes. Joist reinforcement, subfloor prep, and vertical plumbing runs push a second-story bathroom addition in San Gabriel to $45,000 to $85,000. On these older homes, we also factor in that your existing water heater may not support another full bath, so we quote the upgrade upfront rather than mentioning it halfway through.
Bedroom Addition Contractor in San Gabriel
A Bedroom Addition Contractor in San Gabriel works with the reality that most homes here are on modest R-1 lots with limited side-yard space. A ground-floor bedroom addition of 200 to 300 square feet typically runs $55,000 to $120,000, with the variance driven by foundation type, roofline integration, and whether the existing panel can carry the added load. We pull the permit records before we quote so you’re not surprised by a setback determination later.
Multigenerational Bedroom Suites
Overwhelmingly, the bedroom additions we build in San Gabriel are for family: aging parents moving in, adult children returning home, or a new grandchild on the way. That means the bedroom is rarely just a bedroom. We commonly pair it with a private exterior entrance, an ensuite bath, and sound isolation so the generations can live close without living on top of each other.
Second Story Bedroom Additions
When the lot won’t support a ground-floor expansion, we go up. Second story bedroom additions in San Gabriel run $110,000 to $240,000, and on these post-war homes the seismic retrofit requirements often add $15,000 to $30,000. We handle the engineering, the shear wall design, and the plan-check back-and-forth so you’re not learning about cripple walls and foundation bolts from a red-tag notice.
Trusted Brands We Service in San Gabriel
For San Gabriel homeowners who want a faster build, we work with established prefab manufacturers including Cover, Dvele, and Mighty Buildings. These aren’t one-size-fits-all kits; we match the system to your lot, your setback constraints, and your family’s specific needs. Our familiarity with these brands means we can quote accurately the first time, without the learning curve that turns a six-month project into an eighteen-month one. And because dispatch is coordinated from our Los Angeles office, San Gabriel homeowners get the same brand expertise without waiting on a distant supplier.
Common Home Addition Contractor Problems We See in San Gabriel Homes
- Non-conforming alley-lot setbacks stalling plan check. Many San Gabriel garages were built right up to the alley property line decades ago, and today’s city plan checkers flag that immediately. We pull the setback record during feasibility so you don’t pay for a redesign two months into permitting.
- 100-amp panels and cloth-wrapped wiring hidden behind stucco. Opening a 1950s San Gabriel wall almost always reveals electrical work that predates modern code. A 200-amp panel upgrade runs $3,500 to $6,500 here, and plan check won’t sign off without it.
- Galvanized supply lines that fail under pressure. Water lines in post-war San Gabriel homes are commonly original galvanized steel, now corroding from the inside. A full repipe to PEX during an addition runs $6,000 to $12,000 depending on home size, and it’s not optional.
- Mechanical systems sized for coastal weather, not basin heat. San Gabriel sits inland in the San Gabriel Valley basin, where summer highs routinely hit 95 to 105°F. An addition sized with a standard LA cooling load will bake. Title 24 compliance here almost always requires a properly sized ductless mini-split heat pump.
Pricing for Home Addition Contractor in San Gabriel, CA
Here’s what San Gabriel homeowners can expect, in plain numbers. A modest bathroom addition runs $28,000 to $65,000. A ground-floor bedroom addition of 200 to 300 square feet runs $55,000 to $120,000. A second story addition of 500 to 800 square feet runs $110,000 to $240,000. A garage-conversion ADU with a full kitchen runs $95,000 to $180,000 when it includes the panel upgrade, repipe, and setback work these older structures nearly always require. You won’t get a vague “it depends” from us. You’ll get a written, line-item price before we start, and if we find something behind the walls, it becomes a written allowance, priced and approved by you before we proceed. Call (254) 602-5618 to schedule your free estimate.
We Also Serve Cities Near San Gabriel
Our crews serve San Gabriel and the surrounding communities, including San Marino, Temple City, Alhambra, and Rosemead. If you’re just outside the San Gabriel city line, call us anyway; we likely cover your street.
Serving San Gabriel, CA - Our Local Coverage Area
We’re based in the San Gabriel 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 San Gabriel
Because your garage was likely built hard up against the alley property line decades ago, and today’s plan checkers flag that as a non-conforming rear setback before they’ll issue a permit. In San Gabriel specifically, this is tied to the city’s alley-served lot geography; a Monrovia or Pasadena homeowner wouldn’t hit the same snag. We address this during feasibility by pulling the setback record and filing for a formal setback determination before you commit a budget. Call (254) 602-5618 and we’ll check your lot’s status.
Almost certainly yes. The post-war housing stock in San Gabriel commonly still runs on original 100-amp service, and once we open walls or add any square footage, the Building and Safety Division requires a 200-amp upgrade before sign-off. That runs $3,500 to $6,500 here, and we write it into your contract as a line item, not a surprise. Get an exact quote by calling (254) 602-5618.
For most San Gabriel families, a full second kitchen is the right call. This city has one of the highest concentrations of multigenerational Chinese-American households in the San Gabriel Valley, and the overwhelming majority of ADU projects here are built for grandparents or adult children living on the property, not for rental income. That means a high-BTU gas range capable of serious wok cooking and a commercial-grade ventilation hood, not a two-burner cooktop. We design for the family pattern we actually see here. Call (254) 602-5618 to talk through your kitchen needs.
We pause, write the finding into a written allowance, price it, and wait for your written approval before we spend a dollar. Our crew opened up a 1952 detached garage off the rear alley near Coolidge Avenue for a family moving grandparents in, and once the stucco came off we found a 100-amp panel feeding cloth-wrapped wiring, galvanized lines weeping at the joints, and a slab-and-framing detail built hard to the alley property line. We addressed each one through written allowances and a setback determination, and the number they signed at the start was the number they closed on. That’s The Kingswell Way. Call (254) 602-5618 for a quote that holds.
A properly sized ductless mini-split heat pump, and nothing short of it. San Gabriel sits in the San Gabriel Valley basin with the mountains blocking marine airflow, so summer highs of 95 to 105°F are routine, and Title 24 compliance here almost always pushes designers away from window units. We size the system for sustained extreme cooling loads, not a coastal LA baseline. Call (254) 602-5618 and we’ll factor the right mechanicals into your estimate.
Written by Russ Delmar, Owner at Lodgewick ADU Builders, serving San Gabriel since 2010.