Home Addition Contractor in Fontana - Design, Permits and Build Under One Contract

Fast, Reliable Home Addition Contractor Across Fontana

Adding square footage to a Fontana home usually means one thing: your lot already has room, but your house doesn’t. We get that. Our crews work in Fontana every week, from the 1940s ranch tracts west of Sierra Avenue to the newer subdivisions around Sierra Lakes. When you call, a live person answers – not a voicemail. That’s how Lodgewick ADU Builders has run every project since 2010, and it’s how we run yours. If you’re weighing a garage addition, a bump-out, or a full bathroom addition, call (254) 602-5618 and we’ll walk the property with you, then put a written price in your hands before any work starts.

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Why Lodgewick ADU Builders Is Fontana’s Preferred Home Addition Contractor Company

Fontana homeowners tend to ask the same two questions: will the price hold, and will you come back if something fails? Both are fair. Our answer is The Kingswell Guarantee, and it’s in writing on every project. A written price before work begins. A defined arrival window. A clean job site. A written 365-Day Done Right Promise: if the work isn’t right, we come back and make it right, free of charge, within the guarantee period.

Russ Delmar leads our local teams, and he grew up in the same trade culture that built these Fontana neighborhoods. He knows a 1950s ranch on a 12,000 sq ft lot behaves differently than a 1990s tract home in a gated Sierra Lakes community. That local knowledge is why our Fontana customers tend to recommend us to neighbors and cousins. We don’t leave a site until the crew has swept it, and we don’t consider a job done until the homeowner walks it with us and signs off.

Our Home Addition Contractor team coordinates scheduling from the Inland Empire office, which means response time to most Fontana neighborhoods is same-week for estimates. For a city this hot, that matters. You don’t want to sit on a quote for three weeks while the attic hits 120 degrees.

Garage Addition Contractors in Fontana

Garage Addition Contractors in Fontana work on a housing stock that’s unusually well-suited to this kind of project, and for a specific reason. Central and western Fontana neighborhoods were built between the 1940s and 1960s for Kaiser Steel workers, and those lots routinely run 8,000 to 14,000+ sq ft. That means the garage often sits with usable space beside it or above it, and the lot itself gives you room to expand without eating the whole backyard. A two-car garage addition in Fontana typically runs $55,000 to $110,000 depending on finish level, whether the existing slab can be reused, and what the inspector says about the current structure.

Attached Garage Additions

When the garage already shares a wall with the house, the addition often means extending into the side yard and converting part of the old garage into living space. This is where Fontana’s older stock bites back: many of these garages were built with undersized footings and no vapor barrier. We account for that in the initial inspection, not after the concrete is poured.

Detached Garage Additions with Living Space

On the big central-Fontana lots, a detached garage addition frequently becomes a hybrid project: garage below, in-law space above. That triggers ADU requirements under California code, which in this city nearly always starts with a service panel upgrade. More on that below.

Bathroom Addition Contractor in Fontana

A Bathroom Addition Contractor in Fontana has to plan for what’s behind the wall, not just the tile in front of it. Homes built in the 1950s and 1960s here carry original plumbing – galvanized supply lines, cast-iron waste stacks – that often fails during inspection. A full bathroom addition, including plumbing rough-in, waterproofing, and finishes, typically runs $35,000 to $65,000 in Fontana. Smaller half-baths come in lower, around $22,000 to $35,000. Those ranges assume the existing subfloor can support the wet area; if it can’t, the price moves.

Primary Suite Bath Additions

When a Fontana homeowner adds a primary bath, the project usually means pulling a permit, moving or adding a sewer tie-in, and bringing ventilation up to code. That last part is not optional: a bathroom with no proper exhaust in Climate Zone 10 grows mold inside a year. We spec a properly sized exhaust fan and a dedicated circuit as standard, not as an upgrade.

Second Bathroom for Multigenerational Households

Fontana has one of the largest multigenerational Latino/Hispanic populations in the Inland Empire. A lot of the bathroom additions we build are for abuelos moving in, adult children returning, or a shared bath that finally gets split. These projects prioritize a curbless shower, blocking in the walls for grab bars, and a door wide enough for a wheelchair. We build those in from the framing stage.

Trusted Brands We Service in Fontana

We have hands-on experience with the prefab and panelized systems that work well on Fontana lots: Cover, Boxabl, and Mighty Buildings. Each one fits a different situation – some for fast backyard units, some for second-story additions, some for homes near the foothills where fire code changes the assembly. If you’re considering a prefab addition, we’ll help you compare what actually works on your parcel, with real numbers for your specific lot, not a brochure range. For Fontana customers, that means a faster path from permit to closed walls.

Common Home Addition Contractor Problems We See in Fontana Homes

• The 100-amp panel surprise. Open a wall in a 1940s-1960s Fontana ranch and you’ll often find a 100-amp panel feeding cloth-wrapped wiring with no ground. Adding a bath or garage addition then triggers a service upgrade, a sub-panel, and an EV-ready circuit. If that’s not written into the contract, it’s the single biggest driver of mid-job change orders in this city. We write it in as a line-item allowance from day one.
• Foothills fire-zone requirements. Parcels along Baseline and Cherry fall in a CAL FIRE Very High Fire Hazard Severity Zone. A permit there triggers ember-resistant vents, Class A roofing, and one-hour exterior assemblies. That’s $15,000 to $25,000 before the first stud goes up, and contractors who don’t flag it at the first site visit blow their own bids.
• Undersized HVAC for Climate Zone 10. Fontana summers hit 108°F to 112°F in the heat-trapping basin. If the mini-split or ducted system is spec’d with coastal-caliber insulation minimums, the new addition never cools properly. We spec Title 24 compliance for a hot inland climate zone every time, not as an upsell.
• Failed waterproofing on flat additions. Older Fontana homes often have low-slope or poorly flashed roof transitions. A new addition that ties into that roofline without addressing drainage will leak within two winters. We inspect the existing roof-to-wall connection before we design the addition.

Pricing for Home Addition Contractor in Fontana, CA

We Also Serve Cities Near Fontana

Our crews cover Fontana and the surrounding Inland Empire communities: Bloomington, Rialto, Rancho Cucamonga, and Riverside. If you’re in one of those cities and searching for a Home Addition Contractor in Fontana, we can usually get to you the same week for an estimate. The same written price, the same guarantee, the same crew standards apply.

FAQs About Home Addition Contractor in Fontana