ADU Company in Fontana — Design, Permits and Build Under One Contract

We handle the design, the engineering, and the city permit, then build it. One contract, one crew, one accountable point of contact. Free feasibility check on your lot before you commit.

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ADU Company in Fontana, CA

Kitchen remodeling in Fontana usually means working inside a 1950s-to-1970s stucco tract home where the original footprint still drives the layout, and where summer heat above 100°F makes ventilation and cabinet material choices matter more than they do ten miles west. Classic ADU Builders has served Fontana since 2015, and we’ve seen what actually fails in these kitchens: undersized electrical panels, original galvanized supply lines, and layouts built for a family of four in 1962. Call (877) 265-5587 for a free estimate on a kitchen that’s designed for how Fontana homes actually live.

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Why Fontana Homes Are Different

Fontana’s housing stock splits into two rough bands. The older south-Fontana tracts, concentrated in 92335 and 92336, are post-war single-story stucco homes on 7,000-plus square foot lots. Many of these still have original 100-amp panels or aluminum branch wiring, and a surprising number include non-permitted additions or garage conversions from decades ago. That matters because any interior remodel that touches electrical, plumbing, or load-bearing walls can surface a code issue the homeowner didn’t know existed. The north side, in 92336 and 92337, is newer: 1980s through 2000s Mediterranean-stucco subdivisions where the kitchens are larger but often built with budget-grade cabinets that are now at end of life.

Climate shapes the work too. Fontana gets sustained summer heat and Santa Ana wind events, which means kitchen ventilation has to be oversized, not just present. Exhaust fans that can’t move air fast enough turn a renovated kitchen into a heat trap by 4 p.m. On the drainage side, the monsoon-season downpours are brief but intense, so any kitchen that shifts sink or dishwasher locations needs drain slope and venting reviewed against reality, not just code minimum. These aren’t things a generic national estimate accounts for, and they’re exactly the things that change a Fontana kitchen price.

Our Main Fontana Services

The two calls we get most often from Fontana homeowners are about building a detached ADU in the backyard and gut-renovating a bathroom that’s still on its original 1970s plumbing. Here’s what each one looks like here.

ADU Builders in Fontana

Most Fontana lots are big enough for a detached ADU, and the oldest south-Fontana tracts often have the deepest rear yards. But before you size a unit, we check the existing garage and any unpermitted rear structures, because a plan that assumes a clean slate often hits a title search that says otherwise. We work across prefab systems, Tuff Shed conversions, and custom site-built units, and we’ve handled enough Fontana permit reviews to know which questions the city asks first. ADU Builders in Fontana covers the full cost breakdown and which construction method fits a given lot.

ADU Builders in Fontana

Bathroom Remodeling in Fontana

Older Fontana bathrooms share the same problem set as the kitchens: galvanized supply lines, undersized venting, and subfloor damage under tile that was laid directly on plywood decades ago. In a one-bathroom tract home, the remodel has to move fast without cutting corners, because the family doesn’t have a second shower to fall back on. See Bathroom Remodeling in Fontana for typical timelines, what a full gut-renovation actually includes, and honest pricing for this area.

Bathroom Remodeling in Fontana
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What happens when you call

  1. 1
    A real person answersNo phone trees — you reach a local pro.
  2. 2
    You get an upfront price rangeHonest numbers before anyone is dispatched.
  3. 3
    A background-checked tech heads outLicensed & insured, dispatched right away.
  4. 4
    You approve before work beginsNothing starts until you say go.

Kitchen Remodeling in Fontana

A kitchen remodel in Fontana typically runs $28,000 to $78,000 for a full gut-and-replacement, with the biggest variables being cabinet grade, whether the layout changes, and whether the home’s original electrical service can handle modern appliance loads. Homes in the older south-Fontana tracts frequently need panel upgrades or new home runs before a kitchen can pass inspection, which is exactly the kind of surprise a fixed-price estimate should surface before demo starts. We handle the full scope, from layout and cabinet selection through Kitchen Remodeling finish work, including the tile, lighting, and ventilation upgrades that Fontana’s climate demands.

Cabinet Replacement and Refacing

Signs you need it

Doors that have delaminated at the seams, drawer boxes sagging off their slides, or particleboard frames that swell after one monsoon-season window leak.

What it costs in Fontana

Refacing typically runs $9,500 to $18,000; full cabinet replacement with mid-grade hardwood doors lands between $15,000 and $32,000 depending on kitchen size and layout changes.

How we do it

We measure the existing footprint, map what can stay square and level, then order or build replacement boxes, doors, and drawer fronts to match the new appliance and countertop schedule.

Countertop and Backsplash Replacement

Signs you need it

Laminated counters with burnt seams near the range, tile grout that’s permanently stained, or a layout change that orphans the old slab.

What it costs in Fontana

Quartz or granite counters with standard edge profiles run $4,000 to $9,500 for an average Fontana kitchen; a full-height tile or quartz backsplash adds $1,800 to $4,200.

How we do it

We template after the cabinets are set, cut the slab or prep the tile surface in our shop, then install and seal in one day so the kitchen isn’t down longer than necessary.

What Kitchen Remodeling Costs in Fontana

Item Typical range in Fontana
Full kitchen gut and remodel $28,000 – $78,000
Cabinet refacing $9,500 – $18,000
Full cabinet replacement $15,000 – $32,000
Countertop replacement (quartz/granite) $4,000 – $9,500

The two things that push a Fontana kitchen past its initial estimate are buried code violations and hidden water damage. Homes in the older south tracts carry the most risk on both fronts. Our written quotes are line-item, and where a wall cavity can’t be opened without committing to the work, we show you the contingency in writing before you sign, not after.

Will a kitchen remodel in Fontana require a permit?

Yes, if the work moves plumbing, electrical, or any load-bearing framing. Fontana plan check will want current drawings, and anything touching gas lines adds a mechanical review. We handle the permitting, inspections, and the corrections that older homes often need.

How long does a kitchen remodel take in Fontana?

A cabinet-and-counter replacement can finish in two to three weeks. A full gut remodel with layout changes, new electrical, and flooring typically runs six to nine weeks. Older south-Fontana homes with panel upgrades should plan for the longer end.

Brands We Service in Fontana

We work with Plant Prefab, Abodu, Tuff Shed, and James Hardie systems, among others. Our Fontana clients often ask us to compare a Tuff Shed conversion against a Plant Prefab unit, and the honest answer usually comes down to site constraints and long-term finish expectations. See our brands for the full list and what each system does well here in the Inland Empire climate.

Pricing for ADU Company in Fontana, CA

Service Typical range in Fontana
Full kitchen remodel $28,000 – $78,000
Cabinet refacing $9,500 – $18,000
Cabinet replacement $15,000 – $32,000
Countertop replacement $4,000 – $9,500
Bathroom remodel (full) $18,000 – $45,000
Bathroom remodel (cosmetic) $9,500 – $18,000
Detached ADU (prefab/modular) $180,000 – $380,000
Tuff Shed ADU conversion $80,000 – $160,000
Custom site-built ADU $250,000 – $500,000

Fontana prices climb when a job unearths non-permitted prior work, original electrical panels, or septic and sewer lateral issues that have to be corrected before a new structure can connect. We quote fixed, line-item pricing on every project, and we don’t write change orders for scope we should have caught in the estimate.

Neighborhoods We Serve in Fontana

We schedule work across all four Fontana ZIP codes, from the older Rancho Fontana and Southridge tracts to the newer neighborhoods north of Summit Avenue, plus the unincorporated pockets along the Rialto and Bloomington edges. Our typical response time for a Fontana estimate is two to three business days.

  • Rancho Fontana
  • Southridge
  • Walnut Village
  • Summit Heights
  • Sierra Lakes

Service Area – Cities Near Fontana

We also serve the surrounding Inland Empire communities. If you’re in Bloomington, CA or Rialto, CA, we work in those neighborhoods weekly. We cover Glen Avon, CA and Pedley, CA as well, with the same local knowledge of older tract homes and septic-adjacent lots that drives our Fontana pricing.

Serving Fontana, CA — Our Local Coverage Area

We’re based in the Fontana 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 ADU Company in Fontana

Ready to get started? Free estimates · Free written quotes response in Fontana
Call (877) 265-5587

What happens when you call

  1. 1
    A real person answersNo phone trees — talk to a local adu pro.
  2. 2
    You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
  3. 3
    We come out and measureLicensed & insured, at a time that suits you — the visit and the quote are both free.
  4. 4
    You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.

What Fontana Customers Say

★★★★★ 4.8 from 4+ reviews

"The kitchenette layout he suggested made better use of the space than the one on our original sketch."

— Eric Tran

"Detached unit in the back yard. Utilities trenched, separate meter, and it passed final on the first inspection."

— Steve Mercer

"Unit came out great and the tenant is happy. The timeline ran long, largely because of how slow the city was on plan check, though a couple of the delays were scheduling on their end."

— Marcy Miller

How It Works in Fontana

Getting your adu handled is simple and fast.

1

Call or Request a Free Estimate

Tell us about your adu needs and we provide an upfront, transparent quote — no obligation, no hidden fees.

2

Licensed Technician Dispatched

A background-checked, certified technician arrives in Fontana — typically within 30–60 minutes, with parts stocked on the truck.

3

Problem Solved, Guaranteed

We complete the job to your full satisfaction, backed by our warranty and 100% satisfaction guarantee.

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